254 results on '"CLÁUDIA PESSOA"'
Search Results
2. Unraveling the Metabolomic Profile and Bioactivities of the Paratoid Gland Secretion from Rhinella granulosa
- Author
-
Elcio Daniel Barros, Evaldo Monção Filho, Mariluce Fonseca, Patrícia Alves, Antônia Laíres Santos, Chistiane Feitosa, Dulce Helena Silva, Pedro Mikael Costa, Cláudia Pessoa, Carmem Campos, Cristina Monteiro, Mariana Helena Chaves, and Gerardo Vieira Júnior
- Subjects
General Chemistry - Abstract
Toads of the Rhinella genus have a pair of paratoid glands that store biological secretions of high toxicity and varied chemical composition, rich in biologically active compounds. The present work aimed to carry out the investigation of the metabolomic profile and evaluation of the biological potential of the secretion paratoid glands (PGS) from Rhinella granulosa. The paratoid secretion was collected in the Piauí state (Brazil), extracted with methanol and the extract was analyzed by ultra-performance liquid chromatography with quadrupole time-of-flight mass spectrometry. Fifty chemical constituents were identified. The extract showed cytotoxicity against tumor cell lines of the central nervous system (half maximal inhibitory concentration (IC50) = 1.9 µg mL-1) and prostate (IC50 = 1.6 µg mL-1), unsatisfactory antimicrobial potential (minimal inhibitory concentration (MIC) > 312 µg mL-1) and inhibited the enzyme acetylcholinesterase (IC50 = 5.119 mg mL-1). The results presented relevant information about the PGS and contributed to the understanding of the metabolomic and biological potential of R. granulosa.
- Published
- 2023
3. Microcapsules based on alginate and guar gum for co-delivery of hydrophobic antitumor bioactives
- Author
-
Louhana M. Rebouças, Alexandre C.C. Sousa, Caroline G. Sampaio, Larissa M.R. Silva, Pedro M.S. Costa, Cláudia Pessoa, Nilce V.G.P.S. Brasil, and Nágila M.P.S. Ricardo
- Subjects
Polymers and Plastics ,Alginates ,Hesperidin ,Organic Chemistry ,Materials Chemistry ,Animals ,Capsules ,Betulinic Acid ,Zebrafish - Abstract
The main goal was the development of a polysaccharide microcapsule for anticancer application based on guar gum and sodium alginate for the controlled release of hesperidin and betulinic acid by spray drying technique. The microcapsule showed an Encapsulation Efficiency of 98.15 ± 0.34 % for hesperidin and 99.76 ± 0.22 % for betulinic acid. In the release study, the Korsmeyer-Peppas mathematical model was identified as the most adequate to explain the observed release mechanism. In vivo tests were performed in zebrafish model, revealing that the microcapsules did not alter the locomotor activity and were not toxic within 96 h by oral administration, suggesting their biological safety. In vitro cytotoxic activity against HL-60 cells confirmed an IC
- Published
- 2022
4. Toxic profile of marinobufagin from poisonous Amazon toads and antitumoral effects on human colorectal carcinomas
- Author
-
Paulo Michel Pinheiro Ferreira, Lívia Queiroz de Sousa, Rayran Walter Ramos de Sousa, Domingos de Jesus Rodrigues, Evaldo dos Santos Monção Filho, Mariana Helena Chaves, Gerardo Magela Vieira Júnior, Márcia dos Santos Rizzo, Lívia Alves Filgueiras, Anderson Nogueira Mendes, Daisy Jereissati Barbosa Lima, Cláudia Pessoa, João Marcelo de Castro e Sousa, Ana Carolina Borges da Cruz Rodrigues, Milena Botelho Pereira Soares, and Daniel Pereira Bezerra
- Subjects
Pharmacology ,Drug Discovery - Published
- 2023
5. Effects of Incubation Time and Method of Cell Cycle Synchronization on Collared Peccary Skin-Derived Fibroblast Cell Lines
- Author
-
Maria Claudia dos Santos Luciano, Alexsandra Fernandes Pereira, Gabriela Pereira de Oliveira Lira, Alana Azevedo Borges, Fátima de Cássia Evangelista de Oliveira, Matheus Barbosa do Nascimento, and Cláudia Pessoa
- Subjects
0303 health sciences ,0402 animal and dairy science ,Collared peccary ,04 agricultural and veterinary sciences ,Biology ,040201 dairy & animal science ,Incubation period ,Cell biology ,03 medical and health sciences ,medicine.anatomical_structure ,Cell culture ,medicine ,Fibroblast ,Cell synchronization ,030304 developmental biology - Abstract
The success of cloning by somatic cell nuclear transfer depends on the efficiency of nuclear reprogramming, with the cycle stage of the donor cell playing a crucial role. Therefore, the aim was to evaluate three different approaches for cell cycle synchronization: (i) serum starvation (SS) for 1 to 4 days, (ii) contact inhibition (CI) for 1 to 3 days, and (iii) using cell cycle regulatory inhibitors (dimethyl sulfoxide, cycloheximide, cytochalasin B, or 6-dimethylaminopurine) for 1 and 2 days, in terms of their effects on synchronization in G0/G1 phases and viability of collared peccary skin fibroblasts. Flow cytometry analysis revealed that SS for 4 days (79.0% ± 1.6) and CI for 3 days (78.0% ± 1.4) increased the percentage of fibroblasts in G0/G1 compared to growing cells GC (68.1% ± 8.6). However, SS for 3 and 4 days reduced the viability evaluated by differential staining (81.4% ± 0.03 and 81.6% ± 0.06) compared to growing cells (GC, 95.9% ± 0.06). CI did not affect the viability at any of the analyzed time intervals. No cell cycle inhibitors promoted synchronization in G0/G1. These results indicate that CI for 3 days was the most efficient method for cell cycle synchronization in peccary fibroblasts.
- Published
- 2021
6. Biochemical and Pharmaceutic Properties of Genus Phyllanthus spp.: Focus on P. amarus Schum. & Thonn. and P. niruri L
- Author
-
Fátima de Cássia Evangelista de Oliveira, Cláudia Pessoa, Maria Claudia dos Santos Luciano, Maria Francilene Souza Silva, and Guilherme Julião Zocolo
- Subjects
Focus (computing) ,Complementary and alternative medicine ,Traditional medicine ,Drug Discovery ,Biology ,Genus Phyllanthus - Abstract
The genus Phyllanthus belongs to the family Phyllanthaceae with large global distribution, with about 833 species, including Phyllanthus amarus and P. niruri. These species are widely used in traditional medicine because of their pharmacological potential. The objective of this work is to measure the potential of genus Phyllanthus after a technological and scientific monitoring to quantify and evaluate publications and patents related to Phyllanthus spp. with emphasis on P. amarus and P. niruri. The scientific monitoring summarizes morphotaxonomic, pharmacological, chemical, ethnomedicinal and biological aspects. The research was carried out based on papers found in journals deposited in the Web of Science and NCBI (PUBMED) databases and on patents found in the European Patent Office (ESPACENET), Google Patents and the National Institute of Industrial Property (INPI). The results show strong interest in the areas of Pharmacology and Medicinal Chemistry. Patents fall within the Human Necessities section by International Patent Classification as preparations for Medical, Dental or Hygienic Purposes. The summary of monitoring analysis demonstrates the potential pharmacological potential of P. amarus and P. niruri as agents to treat different types of diseases and a range of possibilities for clinical trials in several areas of health.
- Published
- 2021
7. Inhibitory Activity of Brown Propolis Extracts on a Norfloxacin-Resistant Strain of Staphylococcus aureus
- Author
-
Tigressa Helena Soares Rodrigues, Vanessa Moreira Frota, Murilo Sérgio da Silva Julião, Paulo Nogueira Bandeira, Humberto Medeiros Barreto, Cláudia Pessoa, Maria Francilene Souza Silva, Geovany Amorim Gomes, Lavosyer da Silva Mendonça, Mariana Ferreira do Nascimento, Laressa Cristyne dos Santos Gomes, Antonio Linkoln Alves Borges Leal, Jean Parcelli Costa do Vale, Guilherme Julião Zocolo, Francisco Matheus Ferreira Dias, Raquel Oliveira dos Santos Fontenelle, Hélcio Silva dos Santos, and Emanuella Cristina dos Santos Moita
- Subjects
010405 organic chemistry ,Propolis ,medicine.disease_cause ,01 natural sciences ,0104 chemical sciences ,Terpene ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,Minimum inhibitory concentration ,chemistry ,Staphylococcus aureus ,Cycloartenol ,medicine ,Food science ,General Pharmacology, Toxicology and Pharmaceutics ,Ethidium bromide ,Antibacterial activity ,Norfloxacin ,medicine.drug - Abstract
Brown propolis from northern Ceara, Brazil, was found to contain predominantly sesquiterpenes in its volatile profile. The ethanolic propolis extract yielded a substantial apolar fraction (80.07 ± 1.47%) after liquid–liquid partitioning, which explains the low phenolic content (41.33 ± 1.68 mgGAE gEXT−1). Phenolics, such as p-coumaric (0.13 ± 0.04 mg gEPE−1), ferulic (1.07 ± 0.09 mg gEPE−1), and trans-cinnamic (0.41 ± 0.02 mg gEPE−1) acids, were detected in the EtOH-soluble extract. The apolar fraction was rich in triterpenes such as cycloartenol (12.85 ± 2.80%), α-amyrenyl acetate (4.37 ± 0.69%), and α-amyrin (3.89 ± 0.62%). Despite the lack of a direct antibacterial activity against Staphylococcus aureus 1199-B, both fractions exhibited potentiating effects in combination with norfloxacin; these effects could be attributed to efflux pump inhibition. The apolar fraction was more effective than the EtOH-soluble one at reducing the minimum inhibitory concentration, producing similar results to chlorpromazine and ethidium bromide. The EtOH-soluble fraction exhibited cytostatic properties at lower concentrations, while the apolar fraction demonstrated better selectivity for PC3 and HL60 tumor cells. The findings highlight the biological potential of Brazilian brown propolis for application as a complementary agent in the treatment of S. aureus infections and as an alternative therapy for cancer treatment.
- Published
- 2021
8. Chemical constituents and cytotoxic activity of Miconia burchellii Triana (Melastomataceae) leaves
- Author
-
Manoel Odorico de Moraes Filho, Mirley Luciene dos Santos, Gracielle Oliveira Sabbag Cunha, Celina de Jesus Guimarães, Daniela Moreira da Silva, Cláudia Pessoa, Maria Francilene Souza Silva, and Antônio Carlos Severo Menezes
- Subjects
0106 biological sciences ,biology ,Traditional medicine ,Chemistry ,Melastomataceae ,Plant Science ,biology.organism_classification ,01 natural sciences ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,Phytochemical ,Ursolic acid ,Pheophorbide A ,Miconia ,Kaempferol ,Oleanolic acid ,010606 plant biology & botany ,Lupeol - Abstract
Miconia is the largest genus of the flowering plant family Melastomataceae and is widely distributed in the American continent. However, despite its size and widespread distribution, there are few studies on its phytochemical composition and biological activities. Therefore, the aims of this study were to isolate and identify the constituents of Miconia burchellii Triana (Melastomataceae) leaves, and assess their in vitro antiproliferative activity. Phytochemical study allowed the characterization of eight compounds: pheophorbide A ethyl ester (1), kaempferol (2), kaempferol-3-O-β-glucopyranoside (3), kaempferol-3-O-β-galactopyranoside (4), oleanolic acid (5), ursolic acid (6), lupeol (7) and β-sitosterol (8). The ethyl acetate fraction showed potent cytotoxic activity against four of five tumor cell lines tested and compound (1) was cytotoxic against leukemia cell lines (IC50 4.74 μg mL−1), although neither the fraction nor the compound (1) showed selectivity between tumor and non-tumor lines. To the best of our knowledge this is the first study to report on the chemical composition and biological activity of M. burchellii and this is the first case in which cytotoxic activity is attributed to pheophorbide A ethyl ester.
- Published
- 2021
9. Nanocarriers for delivery of taxanes: A review on physicochemical and biological aspects
- Author
-
Bruno Rodrigues Arruda, Maria Gabriela Araújo Mendes, Paulo George Cavalcante de Freitas, Alice Vitoria Frota Reis, Thayane Soares Lima, Luiziana Cavalcante Costa Fernandes Crisóstomo, Karina Alexandre Barros Nogueira, Cláudia Pessoa, Raquel Petrilli, and Josimar O. Eloy
- Subjects
Pharmaceutical Science - Published
- 2023
10. Infraspecific Chemical Variability and Biological Activity of Casearia sylvestris from Different Brazilian Biomes
- Author
-
Luis Francisco Salomé Abarca, Fabíola Manhas Verbi Pereira, Paulo Michel Pinheiro Ferreira, Alberto José Cavalheiro, Paula Carolina Pires Bueno, Naira Buzzo Anhesine, Rayran Walter RamosSousa de, Cláudia Pessoa, Maíra Silva Giffoni, Roseli Buzaneli Torres, Universidade Estadual Paulista (Unesp), Leiden University, Removal of Micropollutants and Radioactive Substances Araraquara, Herbarium IAC, Federal University of Piauí, and Federal University of Ceará
- Subjects
0106 biological sciences ,multivariate data analysis ,Salicaceae ,Casearia ,Biome ,Pharmaceutical Science ,01 natural sciences ,Diterpenes, Clerodane ,Analytical Chemistry ,03 medical and health sciences ,Genus ,Casearia sylvestris ,Drug Discovery ,Botany ,plant ecophysiology ,Ecosystem ,030304 developmental biology ,Pharmacology ,0303 health sciences ,biology ,Plant Extracts ,Organic Chemistry ,biological activities ,Biological activity ,Ecotone ,biology.organism_classification ,metabolomics ,clerodane diterpenoids ,glycosylated flavonoids ,Complementary and alternative medicine ,Molecular Medicine ,Brazil ,010606 plant biology & botany - Abstract
Made available in DSpace on 2021-06-25T10:47:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-02-01 Casearia sylvestris is an outstanding representative of the Casearia genus. This representability comes from its distinctive chemical profile and pharmacological properties. This species is widespread from North to South America, occurring in all Brazilian biomes. Based on their morphology, 2 varieties are recognized: C. sylvestris var. sylvestris and C. sylvestris var. lingua. Despite the existence of data about their chemical composition, a deeper understanding of the specialized metabolism correlation and variation in respect to environmental factors and its repercussion over their biological activities was still pending. In this study, an UHPLC-DAD-based metabolomics approach was employed for the investigation of the chemical variation of 12 C. sylvestris populations sampled across 4? Brazilian biomes and ecotones. The correlation between infraspecific chemical variability and the cytotoxic and antioxidant activities was achieved by multivariate data analysis. The analyses showed that C. sylvestris var. lingua prevailed at Cerrado areas, and it was correlated with lower cytotoxic activity and high level of glycosylated flavonoids. Among them, narcissin and isorhamnetin-3- O-α -L-rhamnopyranosyl-(1 → 2)- α -L-arabinopyranoside showed good correlation with the antioxidant activity. Conversely, C. sylvestris var. sylvestris prevailed at the Atlantic Forest areas, and it was associated with high cytotoxic activity and high content of clerodane diterpenoids. Different casearins showed good correlation (R 2= 0.3?-?0.70) with the cytotoxic activity. These findings highlighted the great complexity among different C. sylvestris populations, their chemical profile, and the related biological activities. Consequently, it can certainly influence the medicinal properties, as well as the quality and efficacy, of C. sylvestris phytomedicines. Institute of Chemistry Department of Biochemistry and Organic Chemistry São Paulo State University (UNESP), CEP 14800-060, Rua Prof. Francisco Degni 55 Natural Products Laboratory Institute of Biology Leiden University Natl. Inst. of Alternative Technol. for Detection Toxicological Assess. Removal of Micropollutants and Radioactive Substances Araraquara Agronomic Institute of Campinas Herbarium IAC Department of Biophysics and Physiology Laboratory of Experimental Cancerology Federal University of Piauí Department of Physiology and Pharmacology Faculty of Medicine Federal University of Ceará Institute of Chemistry Department of Biochemistry and Organic Chemistry São Paulo State University (UNESP), CEP 14800-060, Rua Prof. Francisco Degni 55
- Published
- 2020
11. Structural characterization, antifungal and cytotoxic profiles of quaternized heteropolysaccharide from Anadenanthera colubrina
- Author
-
Cláudia Pessoa, Regina C.M. de Paula, Lucas Brito, Égil de Brito Sá, Fábio de Oliveira Silva Ribeiro, Maria Gabriela Araújo Mendes, Alyne Rodrigues de Araújo, Antônia Carla de Jesus Oliveira, Thaisa Cardoso de Oliveira, José Roberto S. A. Leite, Jefferson Almeida Rocha, Tatiane Caroline Daboit, Ruan Sousa Bastos, Durcilene Alves da Silva, Laís Ramos Monteiro de Lima, José Lamartine Soares Sobrinho, and Gisele Santos de Araújo
- Subjects
Antifungal Agents ,02 engineering and technology ,Biochemistry ,Fungal Proteins ,Ligases ,Gel permeation chromatography ,Mice ,03 medical and health sciences ,Minimum inhibitory concentration ,Polysaccharides ,Structural Biology ,Zeta potential ,Animals ,Humans ,Enzyme Inhibitors ,Cytotoxicity ,Candida albicans ,Molecular Biology ,030304 developmental biology ,chemistry.chemical_classification ,Cryptococcus neoformans ,0303 health sciences ,biology ,Cytotoxins ,Chemistry ,Fungi ,Fabaceae ,General Medicine ,021001 nanoscience & nanotechnology ,biology.organism_classification ,Molecular Docking Simulation ,HEK293 Cells ,Enzyme ,0210 nano-technology ,Anadenanthera colubrina ,Nuclear chemistry - Abstract
In the present work, we investigated the minimal inhibitory concentration (MIC) against fungal strains (Fonsecaea pedrosoi, Microsporum canis, Candida albicans, Cryptococcus neoformans), and cytotoxicity to normal cell lines for modified red angico gum (AG) with eterifying agent N-chloride (3-chloro-2-hydroxypropyl) trimethylammonium (CHPTAC). Quaternized ammonium groups were linked to AG backbone using N-(3-chloro-2-hydroxypropyl) trimethylammonium chloride. The chemical features of the quaternized gum derivatives (QAG) were analyzed by: FTIR, elemental analysis, Zeta potential and gel permeation chromatography. The angico quaternizated gum presented a degree of substitution (DS) of 0.22 and Zeta potential of +36.43. For the antifungal test, it was observed that unmodified gum did not inhibit fungal growth. While, QAG inhibited the growth of most fungi used in this study. By AFM technique QAG interacted with the fungal surface, altering wall roughness significantly. The probable affinity of fragments of the QAG structure for the fungal enzyme 5I33 (Adenylosuccinate synthetase) has been shown by molecular docking. Low cytotoxicity was observed for polymers (unmodified gum and QAG). The results demonstrate that the quaternized polymer of AG presented in this study is a quite promising biomaterial for biotechnological applications.
- Published
- 2020
12. Sulfated xyloglucan-based magnetic nanocomposite for preliminary evaluation of theranostic potential
- Author
-
Aiêrta Cristina Carrá da Silva, Raimundo Rafael de Almeida, Cristine Soares Vidal, João Francisco Câmara Neto, Alexandre Carreira da Cruz Sousa, Fabián Nicolás Araneda Martínez, Daniel Pascoalino Pinheiro, Sarah Leyenne Alves Sales, Cláudia Pessoa, Juliano Casagrande Denardin, Selene Maia de Morais, and Nágila Maria Pontes Silva Ricardo
- Subjects
Drug Delivery Systems ,Structural Biology ,Sulfates ,Magnetic Phenomena ,Xylans ,General Medicine ,Precision Medicine ,Molecular Biology ,Biochemistry ,Glucans ,Magnetic Resonance Imaging ,Theranostic Nanomedicine ,Nanocomposites - Published
- 2022
13. Anti-proliferative profile of Anacardium occidentale polysaccharide and characterization by AFM
- Author
-
Durcilene Alves da Silva, José Roberto S. A. Leite, Laís Ramos Monteiro de Lima, Maria Francilene Souza Silva, Regina C.M. de Paula, Fábio de Oliveira Silva Ribeiro, Alyne Rodrigues de Araújo, Lucas Brito, Cláudia Pessoa, and Flaviane de França Dourado
- Subjects
Magnetic Resonance Spectroscopy ,HL60 ,Rhamnose ,Antineoplastic Agents ,Biocompatible Materials ,02 engineering and technology ,Microscopy, Atomic Force ,Cell morphology ,Polysaccharide ,Biochemistry ,03 medical and health sciences ,chemistry.chemical_compound ,Polysaccharides ,Structural Biology ,Cell Line, Tumor ,Plant Gums ,Humans ,Anacardium ,Cytotoxicity ,Molecular Biology ,030304 developmental biology ,chemistry.chemical_classification ,0303 health sciences ,Molar mass ,Plant Extracts ,Chemistry ,Polymer characterization ,General Medicine ,021001 nanoscience & nanotechnology ,In vitro ,0210 nano-technology - Abstract
This paper explores the application of cashew gum (CG) as an in vitro antiproliferative, firstly by isolating and characterizing the gum using elemental analysis, gel-permeation chromatography, nuclear magnetic resonance (NMR) and atomic force microscopy (AFM). The molar mass of isolated CG was in the order of 103–104 g/mol, with small protein traces present. Polymer characterization by NMR identified key signals correlating to galactose, glucose, rhamnose and acid-related groups. Three distinct conformational stages were observed by AFM. The impact of CG on cell morphology and viability with both tumor and non-tumor cell lines was studied by AFM and 3-(4,5-dimethyl-2-thiazole)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) assay respectively. Antiproliferative activity was confirmed for HCT116 (colorectal carcinoma), B16F10 (melanoma) and HL60 (promyelocytic leukemia) cancer cell lines. A change in cell morphology was demonstrated as an increased surface roughness for HL60. Considering that a CG does not exhibit cytotoxicity to non-tumor lines, it can be seen that the CG shows selectivity for tumor cells and can be a promising biomaterial for future studies.
- Published
- 2020
14. Ruthenium(II)‐Catalyzed Double Annulation of Quinones: Step‐Economical Access to Valuable Bioactive Compounds
- Author
-
Pedro Mikael da Silva Costa, Luísa G. Rosa, Torben Rogge, Lutz Ackermann, Renata G. Almeida, Felipe Fantuzzi, Claus Jacob, Cláudia Pessoa, Renato L. Carvalho, and Eufrânio N. da Silva Júnior
- Subjects
chemistry.chemical_classification ,Annulation ,Leukemia ,010405 organic chemistry ,Organic Chemistry ,Quinones ,chemistry.chemical_element ,Alkyne ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Combinatorial chemistry ,Ruthenium ,Catalysis ,0104 chemical sciences ,chemistry ,Alkynes ,Humans - Abstract
Double ruthenium(II)-catalyzed alkyne annulations of quinones were accomplished. Thus, a strategy is reported that provides step-economical access to valuable quinones with a wide range of applications. C-H/N-H activations for alkyne annulations of naphthoquinones provided challenging polycyclic quinoidal compounds by forming four new bonds in one step. The singular power of the thus-obtained compounds was reflected by their antileukemic activity.
- Published
- 2020
15. Antitumor Potential of the Isoflavonoids (+)- and (−)-2,3,9-Trimethoxypterocarpan: Mechanism-of-Action Studies
- Author
-
Michael G. Gardiner, Cláudia Pessoa, Valder N. Freire, Martin G. Banwell, Manoel Odorico de Moraes, Eveline M. Bezerra, Maryam Nikahd, Maria da Conceição F. de Oliveira, Kaio Moraes de Farias, Jairo Diniz-Filho, Prue Guest, Assuero Silva Meira, Roner F. da Costa, and Xinghua Ma
- Subjects
Programmed cell death ,Chemistry ,Stereochemistry ,Organic Chemistry ,Pterocarpan ,Biochemistry ,Mechanism of action ,Apoptosis ,Drug Discovery ,medicine ,Viability assay ,Enantiomer ,medicine.symptom ,Receptor ,Cytotoxicity - Abstract
[Image: see text] Synthetically derived samples of (+)-(6aS,11aS)-2,3,9-trimethoxypterocarpan [(+)-1] and its enantiomer [(−)-1], both of which are examples of naturally occurring isoflavonoids, were evaluated, together with the corresponding racemate, as cytotoxic agents against the HL-60, HCT-116, OVCAR-8, and SF-295 tumor cell lines. As a result it was established that compound (+)-1 was particularly active with OVCAR-8 cells being the most sensitive and responding in a dose-dependent manner. A study of cell viability and drug-induced morphological changes revealed the compound causes cell death through a mechanism characteristic of apoptosis. Finally, a computational study of the interactions of compound (+)-1 and (S)-monastrol, an established, synthetically derived, potent, and cell-permeant inhibitor of mitosis, with the kinesin-type protein Eg5 revealed that both bind to this receptor in a similar manner. Significantly, compound (+)-1 binds with greater affinity, an effect attributed to the presence of the associated methoxy groups.
- Published
- 2020
16. Electrochemical Selenation/Cyclization of Quinones: A Rapid, Green and Efficient Access to Functionalized Trypanocidal and Antitumor Compounds
- Author
-
Maximilian Stangier, Antonio L. Braga, Lutz Ackermann, Claudia C. Gatto, Maria Francilene Souza Silva, Ícaro A. O. Bozzi, Ammar Kharma, Eufrânio N. da Silva Júnior, Kelly Salomão, Guilherme A. M. Jardim, Claus Jacob, and Cláudia Pessoa
- Subjects
010405 organic chemistry ,Chemistry ,Organic Chemistry ,Physical and Theoretical Chemistry ,010402 general chemistry ,Electrochemistry ,01 natural sciences ,Combinatorial chemistry ,0104 chemical sciences - Published
- 2020
17. Triethylphosphinegold(I) Complexes with Secnidazole-Derived Thiosemicarbazones: Cytotoxic Activity against HCT-116 Colorectal Cancer Cells under Hypoxia Conditions
- Author
-
Heloisa Beraldo, Elaine M. Souza-Fagundes, Jennifer Tavares Jacon Freitas, Ana P. A. Oliveira, Renata Diniz, Juliana Martins Ribeiro, Sarah Sant’Anna Maranhão, and Cláudia Pessoa
- Subjects
chemistry.chemical_classification ,Kidney ,Reactive oxygen species ,Chemistry ,General Chemical Engineering ,Cell ,General Chemistry ,Molecular biology ,Neoplasias ,Article ,chemistry.chemical_compound ,medicine.anatomical_structure ,Neoplasms ,Nitro ,medicine ,Cytotoxic T cell ,Hipóxia ,Tirapazamine ,QD1-999 ,Semicarbazone ,DNA - Abstract
Triethylphosphinegold(I) complexes [Au(HL1)P(CH2CH3)3]PF6 (1), [Au(HL2)P(CH2CH3)3]PF6 (2), and [Au(HL3)P(CH2CH3)3]PF6 (3) were obtained with (E)-2-(1-(2-methyl-5-nitro-1H-imidazol-1-yl)propan-2-ylidene)hydrazinecarbothioamide (HL1), (E)-N-methyl-2-(1-(2-methyl-5-nitro-1H-imidazol-1-yl)propan-2-ylidene)hydrazinecarbothioamide (HL2), and (E)-2-(1-(2-methyl-5-nitro-1H-imidazol-1-yl)propan-2-ylidene)-N-phenylhydrazinecarbothioamide (HL3). All compounds were assayed for their cytotoxic activities against HCT-116 colorectal carcinoma cells under normoxia and hypoxia conditions and against nonmalignant HEK-293 human embryonic kidney cells under normoxia conditions. The thiosemicarbazone ligands HL1-HL3 were inactive against HCT-116 cells under hypoxia but while HL3 was inactive, HL1 and HL2 proved to be cytotoxic to both cell lineages under normoxia conditions. Complexes (1-3) and the triethylphosphinegod(I) precursor proved to be active against both cell lineages in normoxia as well as in hypoxia. While 1 and 3 revealed to be active against HEK-293 and HCT-116 cells, being approximately as active against HCT-116 cells in normoxia as under hypoxia, complex (2) proved to be more active against HCT-116 cells under hypoxia than under normoxia conditions, and more active against HCT-116 cells than against the nonmalignant HEK-293 cells, with the selectivity index, calculated as SI = IC50HEK-293/IC50HCT-116hypoxia, equal to 3.7, similar to the value obtained for the control drug tirapazamine (tirapazamine (TPZ), SI = 4). Although the compounds showed distinct cytotoxic activities, the electrochemical behaviors of HL1-HL3 were very similar, as were the behaviors of complexes (1-3). Complex (2) deserves special interest since it was significantly more active under hypoxia than under normoxia conditions. Hence, in this case, selective reduction of the nitro group in a low oxygen pressure environment, resulting in toxic reactive oxygen species (ROS) and damage to DNA or other biomolecules, might operate, while for the remaining compounds, other modes of action probably occur.
- Published
- 2020
18. Cytotoxic and Antifungal Activity of Chalcones Synthesized from Natural Acetophenone Isolated from Croton anisodontus
- Author
-
Carolina Sidrim de Paula Cavalcante Targino, Paulo Nogueira Bandeira, Mylena Costa da S. de Carvalho Carvalho, Layanne Mesquita Albuquerque Lopes, Jayze da Cunha Xavier, Raquel Oliveira dos Santos Fontenelle, Hélcio Silva dos Santos, Francisco Washington Araújo Barros-Nepomuceno, Cláudia Pessoa, Alexandre Magno Rodrigues Teixeira, Priscila Teixeira da Silva, and Manoel Odorico de Moraes
- Subjects
Chalcone ,biology ,General Chemistry ,biology.organism_classification ,Croton ,Corpus albicans ,In vitro ,chemistry.chemical_compound ,chemistry ,Mechanism of action ,medicine ,MTT assay ,Aldol condensation ,medicine.symptom ,Cytotoxicity ,Nuclear chemistry - Abstract
In this work, eight chalcones were synthesized from the 2-hydroxy-3,4,6trimethoxyacetophenone isolated from Croton anisodontus with benzaldehyde and its derivatives as well as evaluated its cytotoxic and antifungal activities. Chalcones were synthesized by the Claisen-Schimdt aldol condensation reaction in basic medium and identified by 1H and 13C NMR, IR and MS. The MTT assay was used to determine the cytotoxicity of all synthetized compounds against human cancer cell lines. The results showed that the % RCV varied from 19.43 ± 1.31 to 75.51 ± 1.84 %. The chalcone (E)-3-(4-fluorophenyl)-1-(2-hydroxy-3,4,6-trimethoxyphenyl)prop-2-en-1-one demonstrated the strongest activity against HCT-116 cells (% RCV = 75.51 ± 1.84). The in vitro antifungal potential of the chalcones showed that chalcones (E)-3-(furan-2-yl)-1-(2-hydroxy-3,4,6-trimethoxyphenyl)prop-2-en-1-one (MIC 0,625 mg/mL against C. albicans LABMIC 0105) and (E)-1-(2-hydroxy-3,4,6-trimethoxyphenyl)-3-(4-methoxyphenyl)prop-2-en-1-one (MIC 0,312 mg/mL against C. albicans LABMIC 0107) were considered as chalcones of better fungal inhibition. The synergistic evaluation in vitro showed no synergistic effect for both chalcones and for kinetics of fungal death, only treatment with chalcone (E)-1-(2-hydroxy-3,4,6-trimethoxyphenyl)-3-(4-methoxyphenyl)prop-2-en-1-one against LABMIC 0107 was able to promote reduction of fungal cells between the periods of 4 to 8 h and 100% inhibition thereafter, resembling the mechanism of action of Amphotericin B.
- Published
- 2020
19. O ENSINO DA LEITURA DO TEXTO MULTIMODAL NOS PRIMEIROS ANOS DO ENSINO FUNDAMENTAL
- Author
-
ALICE D'ALBUQUERQUE TORREAO and ANA CLÁUDIA PESSOA DOS SANTOS MARQUES
- Abstract
O PRESENTE ARTIGO TEM COMO OBJETIVO ANALISAR COMO AS ATIVIDADES DE LEITURA DOS TEXTOS MULTIMODAIS DO LIVRO DIDÁTICO DE PORTUGUÊS DO 2º ANO DO ENSINO FUNDAMENTAL EXPLORAM O ENSINO DA LEITURA MULTIMODAL DE MANEIRA QUE CONTRIBUAM PARA O LETRAMENTO MULTIMODAL. PARA ISSO, SELECIONAMOS OS TEXTOS MULTIMODAIS VERBO-VISUAIS PRESENTES NO LIVRO DIDÁTICO DE PORTUGUÊS PARA ANÁLISE, OBSERVAMOS AS ATIVIDADES DE LEITURA DOS TEXTOS SELECIONADOS E ANALISAMOS COMO AS ATIVIDADES DE LEITURA CONTRIBUEM PARA DESENVOLVER AS CAPACIDADES LEITORAS ESPECÍFICAS PARA O LETRAMENTO MULTIMODAL. ESSA INVESTIGAÇÃO É CARACTERIZADA COMO UMA PESQUISA-AÇÃO DE CUNHO DESCRITIVO-ANALÍTICO, ADOTANDO UMA METODOLOGIA DE ABORDAGEM QUALITATIVA. POR FIM, PODEMOS CONCLUIR QUE ESSA PESQUISA IRÁ CONTRIBUIR PARA A MELHORIA DO ENSINO, POIS INCENTIVARÁ OS PROFESSORES A EXPLORAREM OS TEXTOS MULTIMODAIS, DESENVOLVENDO HABILIDADES NA LEITURA DESSES TEXTOS PELOS ALUNOS DE MANEIRA MAIS ABRANGENTE E ENRIQUECEDORA, POSSIBILITANDO SUA INTERAÇÃO EM DIFERENTES AMBIENTES SOCIAIS AO UTILIZAREM DIFERENTES LINGUAGENS DE FORMA SIGNIFICATIVA E COERENTE.
- Published
- 2022
20. Tamoxifen/Montmorillonite Hybrid as a Controlled Release Oral System
- Author
-
Dayanne Tomaz Casimiro da Silva, Igor Eduardo Silva Arruda, José Izak Ribeiro de Araújo, Denise de Brito França, Bolivar Ponciano Goulart de Li Damasceno, Fátima de Cássia Evangelista d Oliveira, Cláudia Pessoa, Mônica Felts de La Roca Soares, Maria Gardênnia da Fonseca, and José Lamartine Soares-Sobrinho
- Subjects
History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
21. METABOLIC PROFILING AND CYTOTOXIC ACTIVITY OF METHANOL EXTRACTS FROM Chamaecrista duckeana (P. BEZERRA & A. FERN.) H. S. IRWIN & BARNEBY (LEGUMINOSAE, CAESALPINIOIDEAE)
- Author
-
Daniele Lima, Maria Gleiziane Franca, Fátima Oliveira, Cláudia Pessoa, Alberto Cavalheiro, and Maria Goretti Silva
- Abstract
The genus Chamaecrista comprises more than 330 species, with only a few studies on their chemical composition and biologic activities. In this study, the phytochemical profile of leaf, stems, and fruits extracts of the C. duckeana were examined by UPLC-ESI-HRMS analysis to determine possibly bioactive constituents. The antioxidant activity was carried out through in vitro assay, by the sequestration of the free radical DPPH. To evaluate the cytotoxic activity of the extracts, an MTT assay was used and the IC50 was determined against HL60 and RAJI cell lines. The metabolic profiles of the botanical parts are dominated by flavonoid class, highlighting isoflavonoids such as daidzin and ononin. All these compounds are reported for the first time in C. duckeana. The extracts presented antioxidant potential, and the activity of the stems extract was higher than the standard butylated hydroxytoluene. In the cytotoxic assay, only HL60 line (leukemia) had growth inhibition over 80%. The stems presented more expressive cytotoxicity with IC50 of 137.3 (104.6-180.1) and 106.8 (96.52-118.3) μmol. L-1 for HL60 and RAJI, respectively. In conclusion, the present work provides an in-depth knowledge about the chemical profile of C. duckeana, a species rich in bioactive secondary metabolites with cytotoxic activity
- Published
- 2022
22. Evaluation of the in vitro antitumor effect of the association between doxorubicin and crotamine toxinAssessment of the in vitro antitumor effect of the association between doxorubicin and crotamine toxin
- Author
-
Vanessa Ferreira, Juliana Oliveira, Cláudia Pessoa, Andreimar Soares, and Roberto Nicolete
- Published
- 2022
23. Política habitacional e desigualdades: reflexões a partir de uma Reserva Extrativista Marinha na Amazônia
- Author
-
Débora Melo Alves, Cláudia Pessoa, Tânia Guimarães Ribeiro, and Carla Cilene Siqueira Moreira
- Subjects
General Earth and Planetary Sciences ,General Environmental Science - Abstract
Este artigo tem como objetivo analisar a implementação de uma política habitacional na Reserva Extrativista Marinha Caeté-Taperaçu (REMCT), localizada no município de Bragança, no estado do Pará, a qual nos permite observar como a precariedade das construções habitacionais podem ampliar as desigualdades e resultar em desdobramentos que afetam a qualidade de vida. O Crédito Habitacional foi responsável pela construção de habitações destinadas aos moradores da REMCT no período de 2005 a 2013. Embora tenha ocorrido em um período considerável para sua implementação, a política pública não foi capaz de alcançar nem 30% do total de pessoas que foram cadastradas. Une-se a isso os reclamos dos moradores da RESEX sobre a precariedade nas construções das moradias, sem levar em conta as necessidades laborais e ambientais, requeridas pelo território, ocupado majoritariamente por extrativistas marinhos. Outro fator reverso, foi a interrupção dos recursos destinados ao INCRA, órgão financiador do Crédito Habitacional, aprofundando o déficit de condições de vida. Para esta análise de cunho qualitativo, efetuou-se levantamento bibliográfico sobre Reservas Extrativistas Marinha, políticas públicas, políticas habitacionais e desigualdade e Amazônia; foram realizadas entrevistas semiestruturadas com moradores da Resex; e levantamento de dados em sites e plataformas oficiais. A partir dos resultados, percebemos que a política habitacional possui caráter ambíguo, por um lado, tem produzido satisfação material entre seus proprietários, mas também, por não alcançar a todos os necessitados, pode vir a contribuir para o acirramento de desigualdades.
- Published
- 2022
24. A new N-oxide benzylisoquinoline alkaloid isolated from the leaves of atemoya (Annona cherimola × Annona squamosa)
- Author
-
Manoel Odorico de Moraes, José Carlos Tomaz, Maria Francilene Souza Silva, Edigênia Cavalcante da Cruz Araújo, Norberto Peporine Lopes, Noureddine El Aouad, Jackson Roberto Guedes da Silva Almeida, Emmanoel V. Costa, Suzana V. Rabêlo, Gibson Gomes de Oliveira, Andersson Barison, Raimundo Braz-Filho, Cláudia Pessoa, Larissa Araújo Rolim, and Maria de Fatima Costa Santos
- Subjects
biology ,Traditional medicine ,010405 organic chemistry ,Alkaloid ,General Chemistry ,Annona cherimola ,Annona squamosa ,biology.organism_classification ,01 natural sciences ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,chemistry ,Benzylisoquinoline ,Atemoya - Abstract
Phytochemical investigation of the atemoya aerial parts was carried out by LC-MS-IT and cytotoxic activities were evaluated as well. These results led to the identification of a new N-oxide alkaloid (dehydroanomuricine-N-oxide) and eight other alkaloids: scoulerine, reticuline, isocorydine, norisocorydine, asimilobine, nornuciferine, anonaine, and liriodenine. The new alkaloid dehydroanomuricine-N-oxide and anomuricine were also isolated. The structures of these compounds were determined by spectroscopic and spectrometric techniques. The cytotoxic capacity of crude methanolic extract and the alkaloidal fraction were evaluated, showing moderate cytotoxicity. The isolation and identification of these alkaloids are an important contribution to the chemotaxonomy of the genus Annona and the Annonaceae family.
- Published
- 2021
25. Hidrazonas derivadas de aldeídos naturais: avaliação citotóxica in vitro e determinação de perfil farmacocinético in silico
- Author
-
Cláudia Pessoa, Maria Franciele Souza Silva, Fátima de Cássia Evangelista de Oliveira, Marcília Pinheiro da Costa, Victória Laysna dos Anjos Santos, Cleônia Roberta Melo Araújo, and Arlan de Assis Gonsalves
- Subjects
Medicamentos antineoplásicos ,câncer ,phenylhydrazones ,In silico ,Pharmacology ,Fármacos antineoplásicos ,Cinnamaldehyde ,Intestinal absorption ,In vitro ,chemistry.chemical_compound ,Pharmacokinetics ,chemistry ,cáncer ,fenilhidrazonas ,Toxicity ,cancer ,hibridação molecular ,Cytotoxic T cell ,hibridación molecular ,Pharmacology (medical) ,General Pharmacology, Toxicology and Pharmaceutics ,fenil hidrazonas ,Antineoplastic drugs ,molecular hybridization ,ADME - Abstract
SUMMARY Introduction: Recent research has reported the cytotoxic potential of hydrazones against various strains of cancer cells. Aim: To evaluate the anticancer activity in vitro and the pharmacokinetic profile of six synthesized hydrazonic compounds, identified as vanillin 1-phthalazinylhydrazone (VAN-1); 2,4-dinitrophenylhydra-zone vanillin (VAN-2); phenylhydrazone cinnamaldehyde (CIN-1); isonicotinoyl hydrazone cinnamaldehyde (CIN-2); cinnamaldehyde 1-phthalazinylhydrazone (CIN-3); and 2,4-dinitrophenylhydrazone cinnamaldehyde (CIN-4). The cytotoxic activity was evaluated against four strains of cancer cells. Methodology: The pharmacokinetic parameters of absorption, distribution, metabolism, excretion, and toxicity (ADME/T) of the hydrazones were evaluated using the PreADMET program. Results: Hydrazones derived from cinnamaldehyde (CIN-1 and CIN-2) showed high cytotoxic activity against leukemic (HL-60) and glioblastomas (SF-295) cell lines. The pharmacokinetic profile of the hydrazones showed that, in general, the hydrazones presented satisfactory characteristics of ADME/T. In addition, it was observed that CIN-2 presented the most promising in silico profile, showing high intestinal absorption, desirable distribution profile related to plasma protein binding, adequate renal excretion, and low toxicity. The ADME/T profile of the CIN-1 compound highlighted its potential as a promising antineoplastic agent with action of the CNS, more specifically against glioblastomas. RESUMEN Introducción: Investigaciones recientes han informado del potencial citotóxico de las hidrazonas contra varias líneas de células cancerosas. Objetivo: Evaluar la actividad anticancerígena in vitro y el perfil farmacocinético de seis compuestos hidrazónicos sintetizados, identificados como vainillina 1-ftalazinilhidrazona (VAN-1); vainillina 2,4-dinitrofenilhidrazona (VAN-2); fenilhidrazona cinamal-dehído (CIN-1); cinamaldehído de isonicotinoil hidrazona (CIN-2); cinamalde-hído 1-ftalazinilhidrazona (CIN-3); y 2,4-dinitrofenilhidrazona cinamaldehído (CIN-4). Se evaluó la actividad citotóxica frente a cuatro líneas celulares cancerosas. Metodología: Los parámetros farmacocinéticos de absorción, distribución, metabolismo, excreción y toxicidad (ADME/T) de las hidrazonas se evaluaron mediante el programa PreADMET. Resultados: Las hidrazonas derivadas del cinamaldehído (CIN-1 y CIN-2) mostraron una alta actividad citotóxica contra las líneas celulares leucémicas (HL-60) y glioblastomas (SF-295). El perfil farmacocinético de las hidrazonas mostró que, en general, las hidrazonas mostraban características satisfactorias de ADME/T. Además, se observó que CIN-2 presentó el perfil in silico más prometedor, presentando alta absorción intestinal, perfil de distribución deseable relacionado con la unión a proteínas plasmáticas, excreción renal adecuada y baja toxicidad. El perfil ADME/T del compuesto CIN-1 destacó su potencial como agente antineoplásico prometedor con acción sobre el SNC, más específicamente contra los glioblastomas. RESUMO Introdução: Pesquisas recentes relataram o potencial citotóxico das hidrazonas contra várias linhagens de células cancerígenas. Objetivo: Validara atividade anti-câncer in vitro e o perfil farmacocinético de seis compostos hidrazônicos sintetizados, identificados como vanilina 1-ftalazinil-hidrazona (VAN-1); vanilina 2,4-dinitrofenil-hidrazona (VAN-2); cinnamaldeído de fenil-hidrazona (CIN-1); cinamaldeído isonicotinoil-hidrazona (CIN-2); 1-ftalazinil-hidrazona de cinnamaldeído (CIN-3); e cinamaldeído de 2,4-dinitrofenil-hidrazona (CIN-4). A atividade citotóxica foi avaliada contra quatro linhagens de células cancerígenas. Metodologia: Os parâmetros farmacocinéticos de absorção, distribuição, metabolismo, excreção e toxicidade (ADME/T) das hidrazonas foram avaliados utilizando o programa PreADMET. Resulados: As hidrazonas derivadas do cinnamaldeído (CIN-1 e CIN-2) apresentaram alta atividade citotóxica contra as linhagens celulares leucêmicas (HL-60) e de glioblastomas (SF-295). O perfil farmacocinético das hidrazonas mostrou que, em geral, as hidrazonas apresentaram características satisfatórias de ADME/T. Além disso, observou-se que a CIN-2 apresentou o perfil in silico mais promissor, exibindo alta absorção intestinal, perfil de distribuição desejável relacionado à ligação às proteínas plasmáticas, excreção renal adequada e baixa toxicidade. O perfil ADME/T do composto CIN-1 destacou seu potencial como um agente antineoplásico promissor com ação do SNC, mais especificamente contra glioblastomas.
- Published
- 2021
26. CRISPR/Cas9 small promoter deletion in H19 lncRNA is associated with altered cell morphology and proliferation
- Author
-
Mayara Magna de Lima Melo, Cristiana Libardi Miranda Furtado, Cláudia Pessoa, Daniel Pascoalino Pinheiro, Renan da Silva Santos, Ronald Feitosa Pinheiro, Gilvan Pessoa Furtado, Maria Claudia dos Santos Luciano, Sarah Leyenne Alves Sales, Kaio César Simiano Tavares, and Louhanna Pinheiro Rodrigues Teixeira
- Subjects
Carcinogenesis ,Science ,Biology ,Cell morphology ,medicine.disease_cause ,Article ,Mice ,Cancer epigenetics ,Transcription (biology) ,Neoplasms ,Gene expression ,medicine ,Biomarkers, Tumor ,Animals ,Humans ,Promoter Regions, Genetic ,Gene ,Cell Proliferation ,Sequence Deletion ,Gene Editing ,Gene knockdown ,Multidisciplinary ,Base Sequence ,Cell Cycle ,Promoter ,female genital diseases and pregnancy complications ,Cell biology ,Mechanisms of disease ,Gene Knockdown Techniques ,Cancer cell ,embryonic structures ,Cytogenetic Analysis ,Medicine ,RNA, Long Noncoding ,CRISPR-Cas Systems - Abstract
The imprinted H19 long non-coding RNA, a knowing oncofetal gene, presents a controversial role during the carcinogenesis process since its tumor suppressor or oncogenic activity is not completely elucidated. Since H19 lncRNA is involved in many biological pathways related to tumorigenesis, we sought to develop a non-cancer lineage with CRISPR-Cas9-mediated H19 knockdown (H19-) and observe the changes in a cellular context. To edit the promoter region of H19, two RNA guides were designed, and the murine C2C12 myoblast cells were transfected. H19 deletion was determined by DNA sequencing and gene expression by qPCR. We observed a small deletion (~ 60 bp) in the promoter region that presented four predicted transcription binding sites. The deletion reduced H19 expression (30%) and resulted in increased proliferative activity, altered morphological patterns including cell size and intracellular granularity, without changes in viability. The increased proliferation rate in the H19- cell seems to facilitate chromosomal abnormalities. The H19- myoblast presented characteristics similar to cancer cells, therefore the H19 lncRNA may be an important gene during the initiation of the tumorigenic process. Due to CRISPR/Cas9 permanent edition, the C2C12 H19- knockdown cells allows functional studies of H19 roles in tumorigenesis, prognosis, metastases, as well as drug resistance and targeted therapy.
- Published
- 2021
27. Diphenyl Ditelluride: Redox-Modulating and Antiproliferative Properties
- Author
-
João Antonio Pêgas Henriques, Priscila dos Santos Silveira, José Eduardo Vargas, Renato David Puga, Iuri Marques de Oliveira, Temenouga N. Guecheva, Cristiano Trindade, André Luiz Mendes Juchem, and Cláudia Pessoa
- Subjects
Aging ,Antioxidant ,medicine.medical_treatment ,Systems biology ,Apoptosis pathways ,Review Article ,Biochemistry ,Redox ,Antioxidants ,chemistry.chemical_compound ,Cell surface receptor ,Benzene Derivatives ,Organometallic Compounds ,medicine ,Humans ,lcsh:QH573-671 ,Transcription factor ,lcsh:Cytology ,Diphenyl ditelluride ,Cell Biology ,General Medicine ,Cell cycle ,chemistry ,Biophysics ,Tellurium ,Oxidation-Reduction - Abstract
Tellurium is a rare element that has been regarded as a toxic, nonessential element, and its biological role is not clearly established. In addition, the biological effects of elemental tellurium and some of its organic and inorganic derivatives have been studied, leading to a set of interesting and promising applications. Diphenyl ditelluride (DPDT), an organic tellurium derivate, showed antioxidant, antigenotoxic, antimutagenic, and anticancer properties. The antioxidant and prooxidant properties of DPDT are complex and depend on experimental conditions, which may explain the contradictory reports of these properties. In addition, DPDT may exert its effects through different pathways, including distinct ones to those responsible for chemotherapy resistance phenotypes: transcription factors, membrane receptors, adhesion, structural molecules, cell cycle regulatory components, and apoptosis pathways. This review aims to present recent advances in our understanding of the biological effects, therapeutic potential, and safety of DPDT treatment. Moreover, original results demonstrating the cytotoxic effects of DPDT in different mammalian cell lines and systems biology analysis are included, and emerging approaches for possible future applications are inferred.
- Published
- 2019
28. Synthesis of dehydro-α-lapachones, α- and β-lapachones, and screening against cancer cell lines
- Author
-
Caroline D. Nicoletti, Cláudia Pessoa, Daniel Pascoalino Pinheiro, Vitor F. Ferreira, Débora Omena Futuro, Caroline S. Moreira, Leonardo G. C. de Moraes, and David R. da Rocha
- Subjects
010405 organic chemistry ,Chemistry ,Organic Chemistry ,medicine.disease ,01 natural sciences ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,Leukemia ,medicine.anatomical_structure ,Colon carcinoma ,Cell culture ,Prostate ,Cancer research ,medicine ,MTT assay ,General Pharmacology, Toxicology and Pharmaceutics ,Cancer cell lines ,Cytotoxicity ,Glioblastoma - Abstract
14 new naphthoquinones were prepared and tested against human cancer cell lines PC-3 (prostate), HCT-116 (colon carcinoma), SNB-19 (glioblastoma), HL-60 (leukemia) and MCF-7 (breast), and a nontumor cell line L929 (murine fibroblasts) to determine cytotoxicity with the MTT assay. 8-OH-β-lapachones (14a, 14c, 14d) presented best results, showing low IC50 values and high selectivity for HCT-116 and HL-60 tumor cells.
- Published
- 2019
29. Effect of the kaurenoic acid on genotoxicity and cell cycle progression in cervical cancer cells lines
- Author
-
Carlos Alberto Machado da Rocha, Rommel Rodríguez Burbano, Simone Machado da Rocha, Cláudia Pessoa, Marcelo de Oliveira Bahia, Plínio Cerqueira dos Santos Cardoso, Paulo Cardoso Soares, and Sílvia Maria Machado da Rocha
- Subjects
Ovarian Neoplasms ,business.industry ,Papillomavirus E7 Proteins ,Cell Cycle ,Cell cycle progression ,Oncogene Proteins, Viral ,General Medicine ,Toxicology ,medicine.disease_cause ,DNA-Binding Proteins ,Gene Expression Regulation, Neoplastic ,Repressor Proteins ,Cell Line, Tumor ,Kaurenoic acid ,Cervical carcinoma ,Cancer research ,Humans ,Medicine ,Female ,Diterpenes ,business ,Genotoxicity ,DNA Damage - Published
- 2019
30. In vitro activity evaluation of seven Brazilian Asteraceae against cancer cells and Leishmania amazonensis
- Author
-
Ricardo Toshio Fujiwara, Ana Cláudia Nogueira da Silva, Raquel Martins de Almeida, Daisy Jereissati Barbosa Lima, Manoel Odorico de Moraes Filho, A. M. Nascimento, Débora Caroline do Nascimento Rodrigues, Sebastião Rodrigo Ferreira, Paulo Michel Pinheiro Ferreira, Renato Malveira Carreiro do Nascimento, and Cláudia Pessoa
- Subjects
0106 biological sciences ,Traditional medicine ,biology ,Plant Science ,Asteraceae ,biology.organism_classification ,01 natural sciences ,Terpenoid ,In vitro ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,chemistry.chemical_compound ,Phytochemical ,chemistry ,Cell culture ,Growth inhibition ,Amastigote ,010606 plant biology & botany ,Lupeol - Abstract
Natural products are a very productive leading source of compounds for the development of medicines. The aim of this research was to investigate the in vitro antiproliferative and antileishmanial activities of 21 extracts from 7 Asteraceae species. Dried aerial parts of Asteraceae plant species were extracted using organic solvents in order of increasing polarities. Antiproliferative activity was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) method, and nine extracts (43%) displayed moderate to high in vitro antiproliferative activity against human cancer cell lines HCT-116, OVCAR-8 and SF-295. Two crude extracts displaying antiproliferative activity were fractionated and yielded a fraction rich in lupeol acetate, a fraction rich in lupeol and 5,7,3′,4′-tetrahydroxyflavone-7-O-β-D-glucopyranoside. The antileishmanial activity was evaluated by amastigotes growth inhibition test in Leishmania amazonensis, and three extracts showed promising activity. Phytochemical screening of all plant extracts was also made for terpenoids, flavonoids, tannins, alkaloids and saponins.
- Published
- 2019
31. Cytotoxic Activity of Chemical Constituents and Essential Oil from the Leaves of Leonotis nepetifolia (Lamiaceae)
- Author
-
Camila de Souza Araújo, Mariana Gama e Silva, Andressa L. N. Silva, Thiala Alves Feitosa, Larissa Araújo Rolim, Lucas Gustavo Ferreira Cordeiro Viana, Raimundo Gonçalves de Oliveira-Júnior, David Marrero Delange, Livia Maria Oliveira Damasceno, R. F. Santos, Jackson Roberto Guedes da Silva Almeida, Edigênia Cavalcante da Cruz Araújo, Maria F. da Silva, Cláudia Pessoa, and Ana Paula de Oliveira
- Subjects
Hentriacontane ,biology ,Traditional medicine ,Context (language use) ,General Chemistry ,Leonotis nepetifolia ,biology.organism_classification ,law.invention ,chemistry.chemical_compound ,chemistry ,Phytochemical ,Glucoside ,law ,Lamiaceae ,Medicinal plants ,Essential oil - Abstract
Cancer is a health problem affecting a large part of the world population. In this context, several research groups have investigated molecules with higher efficiency and lower side effects. The species Leonotis nepetifolia is a shrub belonging to the Lamiaceae family with cytotoxicity activity reported in literature. This paper describes the isolation of compounds hentriacontane, phytyl palmitate, stigmasteryl glucoside, 6,7-dimethoxy-5,3’,4’trihidroxyflavone, apigenin-7-O-glucoside and luteolin-7-O-glucoside from extracts and the chemical composition of essential oil from the leaves of Brazilian L. nepetifolia species in addition to its in vitro cytotoxic activities. All compounds were identified by a series of spectrometric and spectroscopic methods, mainly NMR (1D and 2D) and GC-MS, as well as by comparison with literature data. The cytotoxic activity of isolated compounds and essential oil was performed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, against tumor cell lines HCT-116 (human colon) and SF-295 (glioblastoma). The alcohol 1-octen-3-ol was the majoritary compound of the essential oil and the compounds hentriacontane, phytyl palmitate, stigmasteryl glucoside, apigenin-7-O-glucoside and luteolin-7-O-glucoside were describes for the first time in this species. All compounds tested and essential oil showed low cytotoxic activity for the cell lines tested, suggesting that other phytochemical studies should be conducted for the discovery of compounds responsible by cytotoxic activity of the species.
- Published
- 2019
32. Evaluation of cytotoxic and antitumor activity of perillaldehyde 1,2-epoxide
- Author
-
Maria Claudia dos Santos Luciano, Ricardo Luiz Cavalcante De Albuquerque Junior, Grace Anne Azevedo Dória, Damião Pergentino de Sousa, Cláudia Pessoa, P. Severino, Ricardo Guimarães Amaral, Luciana Nalone Andrade, Andressa da Silva, Adriana Andrade Carvalho, and Melina Vieira Alves
- Subjects
0301 basic medicine ,Pharmacology ,Acridine orange ,Pharmaceutical Science ,Plant Science ,Perillaldehyde ,03 medical and health sciences ,chemistry.chemical_compound ,030104 developmental biology ,0302 clinical medicine ,Complementary and alternative medicine ,chemistry ,Apoptosis ,In vivo ,030220 oncology & carcinogenesis ,Drug Discovery ,Cytotoxic T cell ,MTT assay ,Trypan blue ,Cytotoxicity - Abstract
The study aimed to evaluate cytotoxicity and antitumor activity of perillaldehyde 1,2-epoxide (PE), a p-menthane monoterpene derivative against four human tumor cell lines ovarian cancer (OVCAR-8), colon carcinoma (HCT-116), glioblastoma (SF-295) and leukemia (HL-60) using the colorimetric MTT assay. PE showed a high degree of inhibition of cell proliferation (GI = 95.66 to 99.71%) and IC50 16.14 μM (± 1.86), 23.61 μM (± 1.13), 21.99 μM (± 2.64) and, 9.70 μM (± 1.01) against tumor cells, respectively. Then, in vivo antitumor activity of the PE was assessed in sarcoma 180-bearing mice. Tumor growth inhibition rates were 33.4, 56.4 and 66.6% at doses of 100 and 200 mg/kg/day for the PE and 25 mg/kg/day for 5-FU intraperitoneal treatments, respectively. Toxicological effects related to the spleen, kidneys, liver, and hematological were investigated in mice submitted to treatment. Furthermore, histopathological analyses of these organs were absent of any morphological changes in the animals treated with PE. The viability of HL-60 cells was affected by perillaldehyde 1, 2-epoxide after an exposure period of 72 h when analyzed by trypan blue exclusion. PE reduced the number of viable cells associated with an increase in non-viable cells, which contributes to the increased number of dead cells in the morphological analysis. The incorporation of ethidium bromide/acridine orange, the treated cells suggests cytotoxicity via apoptosis and necrosis. So on the results, we conclude that PE presents cytotoxic and antitumoral activity through apoptotic and necrotic processes. Key words: Essential oils, p-menthanes, natural products, cytotoxicity, antitumor activity, sarcoma 180.
- Published
- 2018
33. Metabolic profile and cytotoxicity of non-polar extracts of pineapple leaves and chemometric analysis of different pineapple cultivars
- Author
-
Jhonyson Arruda Carvalho Guedes, Cláudia Pessoa, Maria Francilene Souza Silva, Ricardo Elesbão Alves, Kirley Marques Canuto, Ronaldo Ferreira do Nascimento, Elenilson G. Alves Filho, Fernanda Vidigal Duarte Souza, Edy Sousa de Brito, Guilherme Julião Zocolo, Tigressa Helena Soares Rodrigues, and Lorena Mara A. Silva
- Subjects
0301 basic medicine ,biology ,010401 analytical chemistry ,Biological activity ,biology.organism_classification ,01 natural sciences ,0104 chemical sciences ,03 medical and health sciences ,030104 developmental biology ,Partial least squares regression ,Principal component analysis ,Non polar ,Cultivar ,Food science ,Ananas ,Cytotoxicity ,Agronomy and Crop Science ,Metabolic profile - Abstract
The use of co-products from the fruit agroindustry as a source of bioactive molecules presents economic advantages, since these compounds are highly available and inexpensive. Therefore, the present study aimed to evaluate their qualitative chemical composition followed by multivariate analysis, and to correlate the results with those of the cytotoxicity tests. The non-polar metabolic profiles of the leaves of seven commercial pineapple (Ananas comosus (L.) Merr.) cultivars were investigated by using GC–MS. Twenty-seven metabolites were identified from the seven hexanic extracts. Multivariate analysis (Hierarchical Cluster Analysis, Principal Component Analysis and Partial Least Squares) revealed significant differences in the metabolic fingerprint of the different cultivars. Overall, the hexanic extracts of the seven cultivars of pineapple leaves showed promising antitumor activity against the six tumor lines tested (colon, leukemia, prostate, astrocytoma, breast and cervix). Correlation of the chemometric data, qualitative analysis, and cytotoxic tests allowed us to determine the possible biomarkers responsible for each specific antitumor activity. This study demonstrates a great valuation potential of a co-product little explored in the agroindustry of foods through the prospection of biologically active compounds.
- Published
- 2018
34. Synthesis, docking, machine learning and antiproliferative activity of the 6-ferrocene/heterocycle-2-aminopyrimidine and 5-ferrocene-1H-Pyrazole derivatives obtained by microwave-assisted Atwal reaction as potential anticancer agents
- Author
-
Cláudia Pessoa, Mariana K. Antoniazi, Fátima de Cássia Evangelista de Oliveira, Alex Gutterres Taranto, Sandro J. Greco, Marcos A. Ribeiro, Jorge Welton de Souza Pina, Eclair Venturini Filho, Celina de Jesus Guimarães, Laiza B. Loureiro, and Carlos B. Pinheiro
- Subjects
Pyrimidine ,Metallocenes ,Clinical Biochemistry ,Pharmaceutical Science ,Antineoplastic Agents ,Pyrazole ,Machine learning ,computer.software_genre ,Biochemistry ,Microwave assisted ,Machine Learning ,chemistry.chemical_compound ,Structure-Activity Relationship ,Cell Line, Tumor ,Drug Discovery ,Humans ,Ferrous Compounds ,Microwaves ,Molecular Biology ,Cell Proliferation ,Reaction conditions ,Dose-Response Relationship, Drug ,Molecular Structure ,business.industry ,Organic Chemistry ,Biological activity ,Molecular Docking Simulation ,Pyrimidines ,Ferrocene ,chemistry ,Docking (molecular) ,Microwave irradiation ,Molecular Medicine ,Pyrazoles ,Artificial intelligence ,Drug Screening Assays, Antitumor ,business ,computer - Abstract
A simple and fast methodology under microwave irradiation for the synthesis of 2-aminopyrimidine and pyrazole derivatives using Atwal reaction is reported. After the optimization of the reaction conditions, eight 2-aminolpyrimidines containing ferrocene and heterocycles and three ferrocene pyrazoles were synthesized from the respective chalcones in good yields. Eight compounds had their structure determined by X-ray diffraction. The molecular hybrid 6a-h and 9a-c were tested on four cancer cell lines - HCT116, PC3, HL60 and SNB19 - where four pyrimidine 6a, 6f-h and one pyrazole 9c derivatives show promising antiproliferative activity. In addition, docking simulation and machine learning methods were carried out to explain the biological activity achieved by the synthetized compounds.
- Published
- 2021
35. Synthesis of alkynylated 1,2,4-oxadiazole/1,2,3-1H-triazole glycoconjugates: Discovering new compounds for use in chemotherapy against lung carcinoma and Mycobacterium tuberculosis
- Author
-
Vanessa Pinheiro Gonçalves Ferreira, Lílian Maria Lapa Montenegro Pimentel, Cybele Flávia do Amaral Moura, Valentina Nascimento Melo de Oliveira, Cláudia Pessoa, Héverton Mendes Araújo, Brijesh Rathi, Lindomar Pena, Roberto Nicolete, Aline dos Santos Peixoto, Prem Prakash Sharma, Janaína V. dos Anjos, Patrick Rollin, Arnaud Tatibouët, and Ronaldo N. de Oliveira
- Subjects
Lung Neoplasms ,Glycoconjugate ,Cell Survival ,Triazole ,Antitubercular Agents ,Antineoplastic Agents ,Microbial Sensitivity Tests ,Cell Line ,Mycobacterium tuberculosis ,chemistry.chemical_compound ,Mice ,Structure-Activity Relationship ,Chlorocebus aethiops ,Drug Discovery ,Animals ,Humans ,Viability assay ,Cytotoxicity ,Cell Proliferation ,Pharmacology ,chemistry.chemical_classification ,Oxadiazoles ,biology ,Dose-Response Relationship, Drug ,Molecular Structure ,INHA ,Organic Chemistry ,General Medicine ,Triazoles ,biology.organism_classification ,chemistry ,Cell culture ,Alkynes ,Cancer research ,Vero cell ,Carcinoma, Squamous Cell ,Glycoconjugates - Abstract
A total of forty-three compounds were synthesized, including thirty-two new ones. Among those compounds, seventeen were selected and tested on human tumor cell lines: PC-3 (prostate adenocarcinoma), HCT-116 (colorectal tumor), NCIH-460 (lung carcinoma), SKMEL-103 (melanoma) and AGP-01 (gastric tumor). Alkynylated 1,2,4-oxadiazoles 2m, 3g and 3k exhibited antiproliferative activities against NCIH-460 in culture. Alkynylated N-cyclohexyl-1,2,4-oxadiazoles 3a-m and bis-heterocycle glucoglycero-1,2,3-triazole-N-cyclohexyl-1,2,4-oxadiazole derivatives 5a-k and 6–11 were evaluated for their in vitro efficacy towards Mycobacterium tuberculosis (Mtb) H37Ra and H37Rv strains. In general, glycerosugars conjugated to 1,2,4-oxadiazole via a 1,2,3-triazole linkage (5a, 5e, 5j, 5k, and 7) showed in vitro inhibitory activity against Mtb (H37Rv). The largest molecules bis-triazoles 10 and 11, proved inactive against TB. Probably, the absence of the N-cyclohexyl group in compound 8 and 1,2,4-oxadiazole nucleus in compound 9 were responsible for its low activity. Glucoglycero-triazole-oxadiazole derivatives 5e (10 μM) and 7 (23.9 μM) were the most promising antitubercular compounds, showing a better selective index than when tested against RAW 264.7 and HepG2 cells. Vero cell were used to investigate cytotoxicity of compounds 5a, 5h, 5j, 5k, and these compounds showed good cell viability. Further, in silico studies were performed for most active compounds (5e and 7) with potential drug targets, DprE1 and InhA of Mtb to understand possible interactions aided with molecular dynamic simulation (100ns).
- Published
- 2021
36. Preparation, Spectral Characterization and Anticancer Potential of Cinnamic Esters
- Author
-
Telma L. G. Lemos, Renan O. Gonçalves, Iolanda F. de Farias, Francisco José Queiroz Monte, Maria Francilene Souza Silva, Guilherme Julião Zocolo, Cláudia Pessoa, and Davila Zampieri
- Subjects
Acrylate ,chemistry.chemical_compound ,chemistry ,HL60 ,General Chemistry ,Steglich esterification ,Carbon-13 NMR ,Fourier transform infrared spectroscopy ,Cytotoxicity ,IC50 ,Cinnamic acid ,Nuclear chemistry - Abstract
Cinnamic acid and its derivatives show a remarkable variety of biological activities and are often studied in search of the development of new and highly effective drugs. This work aims to synthesize, characterize and evaluate the cytotoxic activity of esters derived from cinnamic acid. Eighteen esters were synthesized through Steglich’s esterification, of which eleven were not reported in the literature. All compounds were fully characterized by Fourier transform infrared epectroscopy (FTIR), nuclear magnetic resonance (1H and 13C NMR) and high-resolution mass spectrometry (HRMS) data. The cytotoxic activity of esters obtained was evaluated using four human tumor cell lines: SNB-19 (astrocytoma), HCT-116 (colon carcinoma, human), PC3 (prostate) and HL60 (promyelocytic leukemia) through the 3-(4,5-dimethyl-2-thiazolyl)- 2,5‑diphenyl-2H‑tetrazolium (MTT) colorimetric assay. These studies showed that the compound 3-methoxybenzyl (E)‑3‑(4‑methoxyphenyl)acrylate (12) is the most potent against HCT-116, PC3 and SBN-19 cells, with the lowest half maximal inhibitory concentration (IC50) value of 16.2 μM in the HCT-116 strain. The derivatives were obtained in good yields (76.6-95%), except for compounds 5-isopropyl-2-methylphenyl (E)-3-(3-hydroxy-4-methoxyphenyl)acrylate (17) (18.6%) and 2-isopropyl-5-methylphenyl (E)-3-(3-hydroxy-4-methoxyphenyl)acrylate (18) (15.5%).
- Published
- 2021
37. Chemical composition, in vitro cytotoxic and anticholinesterase activities of flower extracts of Senna spectabilis var. excelsa and Senna macranthera
- Author
-
Anderson F. de Sousa, Maria Gleiziane Araújo Franca, Fátima de Cássia Evangelista de Oliveira, Maria Teresa Salles Trevisan, Maria Goretti de Vasconcelos Silva, Daniele Rodrigues de Lima, Cláudia Pessoa, Cristiane Félix de Paiva, Alberto José Cavalheiro, Federal University of Ceará, and Universidade Estadual Paulista (UNESP)
- Subjects
Antioxidant ,ABTS ,antioxidant ,biology ,Traditional medicine ,DPPH ,Senna ,medicine.medical_treatment ,Senna macranthera ,Organic Chemistry ,Plant Science ,acetylcholinesterase ,biology.organism_classification ,Biochemistry ,Analytical Chemistry ,chemistry.chemical_compound ,Rutin ,chemistry ,Senna spectabilis ,medicine ,cytotoxicity ,Quercetin - Abstract
Made available in DSpace on 2022-05-01T10:51:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 In this study, we investigated the phenolic and antioxidant content, cytotoxic, and anticholinesterase activities of flower extracts of Senna spectabilis var. excelsa and Senna macranthera. The antioxidant activities performed by the DPPH and ABTS methods showed that the extracts possess good antioxidant activity, with emphasis on the S. macranthera extract, which obtained results very similar to the rutin pattern. In the evaluation of the cytotoxic activity, the species S. spectabilis var. excelsa presented expressive cytotoxicity against the cellular lines PC3 and HL60 with IC50 values 21.08 and 31.37 μg mL−1, respectively. The results of anticholinesterase activity showed that both the plants induced enzyme inhibition, reaching 14 mm of inhibition in the case of S. spectabilis var. excelsa. The good results obtained in this work may be related to the presence of compounds such as apigenin-7-apioglucoside, quercetin 3,4'-diglucoside, cassine and spectaline identified in the extracts in our previous work. Department of Organic and Inorganic Chemistry/Department of Analytical Chemistry and Physical-Chemistry Federal University of Ceará Department of Physiology and Pharmacology Federal University of Ceará Chemistry Institute São Paulo State University - UNESP Chemistry Institute São Paulo State University - UNESP
- Published
- 2021
- Full Text
- View/download PDF
38. Chemical composition and bioactivities of essential oils from different chemotypes of Lippia alba (Mill.) N.E.Br. Ex Britton e P. Wilson
- Author
-
Hortência Ribeiro Liberato, Ícaro Gusmão Pinto Vieira, Elthon G. Ferreira, Cláudia Pessoa, Antonio Carlos Nogueira Sobrinho, Selene Maia de Morais, Raquel Oliveira dos Santos Fontenelle, Daniela Ribeiro Alves, and Rita de Cássia Alves Pereira
- Subjects
biology ,Chemotype ,Chemistry ,Botany ,biology.organism_classification ,Chemical composition ,Lippia alba - Published
- 2021
39. Expression of cetuximab biosimilar for development of Immunonanoparticle: Strategies and targets for drug delivery proposal towards treatment of prostate cancer
- Author
-
José de Brito Vieira Neto and Cláudia Pessoa
- Subjects
Oncology ,medicine.medical_specialty ,Prostate cancer ,Cetuximab ,business.industry ,Internal medicine ,Drug delivery ,Medicine ,Biosimilar ,business ,medicine.disease ,medicine.drug - Published
- 2021
40. Chemical Constituents and Cytotoxic Activity of Rhinella jimi (Anura: Bufonidae)
- Author
-
Evaldo dos Santos Monção Filho, Cláudia Pessoa, Mariluce Gonçalves Fonseca, Mariana Helena Chaves, Paulo Michel Pinheiro Ferreira, Yara P. F. Pio, Daisy Jereissati Barbosa Lima, Bruno Quirino Araújo, and Gerardo Magela Vieira
- Subjects
Chromatography ,biology ,Rhinella jimi ,Ethyl acetate ,Atmospheric-pressure chemical ionization ,General Chemistry ,Toad ,Mass spectrometry ,biology.organism_classification ,chemistry.chemical_compound ,chemistry ,Bromide ,biology.animal ,Chemical composition ,IC50 - Abstract
Rhinella jimi toads (Stevaux, 2002) belong to the Bufonidae family, are endemic in the Brazilian Northeast and are commonly found during rainy periods. In general, amphibians of this family have in their poisons different metabolites that show a diversity of pharmacological activities. The isolation and identification of these compounds are of great importance, and techniques such as high-performance liquid chromatography coupled to mass spectrometry are widely used for the discovery of novel and known compounds in these poisons. For R. jimi poison, the ethyl acetate and methanolic extracts were obtained and thirty compounds were identified by combining ultra-performance liquid chromatography coupled to mass spectrometry (UPLC-MS) with direct infusion atmospheric pressure chemical ionization mass spectrometry (DI-APCI-MS/MS) and direct infusion electrospray mass spectrometry (DI-ESI-MS/MS) for each extract, respectively. Marinobufagin (2) and marinobufotoxin (19) were the majorities of each extract, respectively. In addition, other bufadienolides mainly present in the ethyl acetate extract, such other bufotoxins, alkaloids and arginine diacid derivatives were identified in the methanol extract. In a cytotoxic assay by 3-(4,5-dimethylthiazol-2-yl)-2,5‑diphenyltetrazolium bromide (MTT), the extracts and compound 2 demonstrated half-maximal inhibitory concentration (IC50) values better than the positive control doxorubicin, evidencing excellent cytotoxic. This is the most complete study of the chemical composition of R. jimi toad poison and its respective cytotoxic activity, promoting the enrichment of knowledge about this family and species.
- Published
- 2021
41. Supportive Drugs in Leukemia Treatment During Pregnancy
- Author
-
Celina de Jesus Guimarães, Cláudia Pessoa, Sarah Sant’Anna Maranhão, and Pedro Mikael da Silva Costa
- Subjects
education.field_of_study ,Chemotherapy ,medicine.medical_specialty ,Pregnancy ,business.industry ,Incidence (epidemiology) ,medicine.medical_treatment ,Population ,Cancer ,medicine.disease ,Leukemia ,Supportive psychotherapy ,Medicine ,business ,education ,Intensive care medicine ,Adverse effect - Abstract
The diagnosis of leukemia during pregnancy is a rare event. The low incidence of leukemia that occurs during pregnancy generates few reports of management, which makes it difficult to search for updated information. Considering that strategies for chemotherapy treatment of leukemia in this population are the same as those used for non-pregnant patients, it is necessary to make an adequate assessment if the chosen medication can bring more risks than benefits during pregnancy, for both the mother and the fetus. Supportive drugs are used to manage adverse events that must be well stabilized, as some of them may be contraindicated or inadvisable during pregnancy. This chapter aims to gather information from the literature on the main drugs involved in the supportive therapy of symptoms presented during chemotherapy treatment of leukemia in pregnancy, as well as safety and risk data in the stages of pregnancy.
- Published
- 2020
42. Cytotoxicity potential of chemical constituents isolated and derivatised from Rhinella marina venom
- Author
-
Evaldo dos Santos Monção Filho, Gerardo Magela Vieira Júnior, Paulo Michel Pinheiro Ferreira, Domingos de Jesus Rodrigues, Mariana Helena Chaves, Daisy Jereissati Barbosa Lima, Sarah Sant’Anna Maranhão, and Cláudia Pessoa
- Subjects
0106 biological sciences ,Venom ,Toxicology ,01 natural sciences ,High-performance liquid chromatography ,03 medical and health sciences ,chemistry.chemical_compound ,Column chromatography ,Cell Line, Tumor ,Animals ,Humans ,Cytotoxicity ,0303 health sciences ,Chromatography ,Molecular mass ,Chemistry ,Venoms ,010604 marine biology & hydrobiology ,030302 biochemistry & molecular biology ,Bufalin ,Acetic anhydride ,HEK293 Cells ,Sephadex ,Amphibian Venoms ,Bufo marinus ,Brazil - Abstract
Chemical compounds from skin secretions from toads of Bufonidae family have been long-studied. In the search for new molecules with pharmacological action, the 3β-OH groups of bufadienolides are commonly derivatised using acetyl groups. This work described the isolation and/or structural elucidation of isolated and derivatised compounds from the venom of the Brazilian anuran Rhinella marina, and their evaluation in in vitro assays. In the methanolic extract of the R. marina venom, compound cholesterol (1) was isolated from the CRV-52 fraction by classic column chromatography, dehydrobufotenine (2) by Sephadex LH-20 from the CRV-28 fraction, and a mix of suberoyl arginine (3) and compound 2 was obtained from the CRV-6-33 fraction. The compounds marinobufagin (4), telocionbufagin (5) and bufalin (6) were isolated by classic column chromatography, followed by separation via HPLC in the CRV-70 fraction, and the compound marinobufotoxin (9) was isolated by classic column chromatography in the CRV-6 fraction, here being isolated for the first time in R. marina specimens. Compounds 4 and 5 were submitted for acetylation with acetic anhydride, in the presence of pyridine and 4-dimethyilaminopiridine (DMAP), in order to obtain the compounds 3-acetyl-marinobufagin (7) and 3-acetyl-telocinobufogin (8). The isolated and derivatised compounds were identified by 1H and 13C NMR, and their molecular mass confirmed by mass spectrometry. All compounds (except 1 and 3) were tested in cytotoxic assays by the MTT method and presented cytotoxic potential against human cancer cell lines, as well as against non-tumoral human embryonic kidney HEK-293 cells. With the exception of compound 2, all molecules presented IC50 values
- Published
- 2020
43. New 5-carba-pterocarpans: Synthesis and preliminary antiproliferative activity on a panel of human cancer cells
- Author
-
Samuel Monteiro, Carlos Roberto Koscky Paier, Paulo R. R. Costa, Julio C. F. Barcellos, Francisco V. Gaspar, Cláudia Pessoa, Maria Claudia dos Santos Luciano, Jorge L.O. Domingos, and Soraya Marques Ribeiro
- Subjects
Pterocarpans ,Cell ,Antineoplastic Agents ,Cell lineage ,01 natural sciences ,Biochemistry ,Cell Line ,Mice ,Structure-Activity Relationship ,Prostate ,Drug Discovery ,medicine ,Animals ,Humans ,Molecular Biology ,Cell Proliferation ,Dose-Response Relationship, Drug ,Molecular Structure ,010405 organic chemistry ,Chemistry ,Organic Chemistry ,Myeloid leukemia ,Cancer ,medicine.disease ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,medicine.anatomical_structure ,Antiproliferative Agents ,Cancer research ,Drug Screening Assays, Antitumor ,Human cancer ,Glioblastoma - Abstract
Natural pterocarpans and synthetic 5-carba-pterocarpans are isosteres in which the oxygen atom at position 5 in the pyran-ring of pterocarpans is replaced by a methylene group. These 5-carba-analogues were obtained in good yields through the palladium-catalyzed oxyarylation of alcoxy-1,2-dihydronaphthalens with o-iodophenols in PEG-400. They were evaluated on human cancer cell lineages derived respectively from prostate tumor (PC3, IC50 = 11.84 μmol L−1, SI > 12)) and acute myeloid leukemia (HL-60, IC50 = 8.81 μmol L−1, SI > 16), highly incident cancer types presenting resistance against traditional chemotherapeutics. Compound 6c (LQB-492) was the most potent (IC50 = 3.85 μmol L−1, SI > 37) in SF-295 cell lineage (glioblastoma). Such findings suggest that 5-carba-pterocarpan can potentially be new hit compounds for further development of novel antiproliferative agents.
- Published
- 2020
44. Poly(N-isopropylacrylamide)/galactomannan from Delonix regia seed thermal responsive graft copolymer via Schiff base reaction
- Author
-
Judith P.A. Feitosa, Cláudia Pessoa, Jeanlex S. Sousa, Everton Lucas de Lima Ramos, Maria Francilene Souza Silva, Durcilene Alves da Silva, Fábio de Oliveira Silva Ribeiro, Laís Ramos Monteiro de Lima, Haroldo C.B. Paula, and Regina C.M. de Paula
- Subjects
Imine ,Acrylic Resins ,Biocompatible Materials ,02 engineering and technology ,Biochemistry ,Lower critical solution temperature ,Polymerization ,Mannans ,03 medical and health sciences ,chemistry.chemical_compound ,Dynamic light scattering ,Structural Biology ,Polymer chemistry ,Copolymer ,Transition Temperature ,Molecular Biology ,Schiff Bases ,030304 developmental biology ,0303 health sciences ,Schiff base ,Molar mass ,Galactose ,Fabaceae ,General Medicine ,021001 nanoscience & nanotechnology ,Grafting ,chemistry ,Seeds ,Poly(N-isopropylacrylamide) ,0210 nano-technology - Abstract
Aminated poly(N-isopropylacrylamide) (PNIPAm-NH2) was grafted onto oxidized galactomannan polysaccharide extracted from Delonix regia (OXGM) via Schiff base reaction by a simple, rapid synthetic route, deprived of the use of organic solvents. Grafting was confirmed by FTIR and 1H NMR and the self-organizing ability of the obtained nanoparticle copolymers was investigated by dynamic light scattering (DLS). The minimum concentration required for self-organization (CAC) at 25 °C was higher than at 50 °C. Lower critical solution temperature (LCST) was in the range 34–40 °C, depending on both inserted PNIPAm-NH2 molar mass and on the presence of reduced imine bond. Synthesized copolymers are promising candidates for drug delivery as they show good cell viability, particle size around 250 nm and transition temperature closer to that of human body. Reaction success points out to the possibility of use free aldehyde groups of oxidized polysaccharide, not used in the copolymerization, to form a pro-drug with substances that possess NH2 groups in their structure, such as doxorubicin.
- Published
- 2020
45. Toxicological, chemopreventive, and cytotoxic potentialities of rare vegetal species and supporting findings for the Brazilian Unified Health System (SUS)
- Author
-
Daisy Jereissati Barbosa Lima, Edigênia Cavalcante da Cruz Araújo, Jurandy do Nascimento Silva, Antônia Maria das Graças Lopes Citó, Alessandro de Lima, Ruth Raquel Soares de Farias, Gardenia C.G. Militão, Cláudia Pessoa, Raffaele Capasso, Nayana Bruna Nery Monção, Marcília Pinheiro da Costa, Paulo Michel Pinheiro Ferreira, Mônica Regina Silva de Araújo, Mariana Helena Chaves, Silva, J. D. N., Moncao, N. B. N., de Farias, R. R. S., Cito, A. M. D. G. L., Chaves, M. H., Araujo, M. R. S. D., Lima, D. J. B., Pessoa, C., Lima, A. D., Araujo, E. C. D. C., Militao, G. C. G., Costa, M. P. D., Capasso, R., and Ferreira, P. M. P.
- Subjects
Flora ,Health, Toxicology and Mutagenesis ,Zoology ,Biology ,Toxicology ,medicine.disease_cause ,Ecotoxicology ,01 natural sciences ,environmental toxicology ,Antioxidants ,medicine ,Cytotoxic T cell ,Humans ,Cells, Cultured ,Ecosystem ,Methylene Chloride ,Plants, Medicinal ,010405 organic chemistry ,Cytotoxins ,Plant Extracts ,genotoxicity ,Cell Cycle ,Antineoplastic Agents, Phytogenic ,0104 chemical sciences ,010404 medicinal & biomolecular chemistry ,Oxidative Stress ,cell cycle arrest ,Environmental toxicology ,antitumoral action ,Genotoxicity ,Brazil ,DNA Damage - Abstract
Caatinga flora which are found in a poor Brazilian region contain a substantial number of endemic taxa with biomedical and social importance for regional communities. This study examined the antioxidant and cytotoxic potential of 35 samples (extracts/fractions) from 12 Caatinga species and determined the antiproliferative and genotoxic action of dichloromethane fraction from Mimosa caesalpiniifolia stem bark (DC-Mca) on human and vegetal cells. Samples were assessed for chemopreventive ability, toxic effects on Artemia salina shrimp as well as cytotoxicity on tumor cell lines and erythrocytes. DC-Mca was also tested with respect to antiproliferative and genotoxic effects upon normal leukocytes and meristematic cells from A. cepa roots. Some extracts reduced free radical levels >95% and 7 samples exhibited a lethal concentration (LC) 50
- Published
- 2020
46. Metabolomics-Based Discovery of Biomarkers with Cytotoxic Potential in Extracts of Myracrodruon urundeuva
- Author
-
Licia dos Reis Luz, Edy Sousa de Brito, Jhonyson Arruda Carvalho Guedes, Paulo Riceli Vasconcelos Ribeiro, Maria Francilene Souza Silva, Guilherme Julião Zocolo, Caio B. Castro, Cláudia Pessoa, Gisele Silvestre da Silva, Davila Zampieri, Kirley Marques Canuto, Diogo Denardi Porto, CAIO BEZERRA DE CASTRO, Universidade Federal de São Carlos. Departamento de Química, EDY SOUSA DE BRITO, CNPAT, DÁVILA DE SOUZA ZAMPIERI, Universidade Federal do Ceará. Departamento de Química Orgânica e Inorgânica., ClLAUDIA DO Ó PESSOA, Universidade Federal do Ceará. Núcleo de Pesquisa e Desenvolvimento de Medicamentos (NPDM)., GUILHERME JULIAO ZOCOLO, CNPAT., LICIA DOS REIS LUZ, Universidade Federal do Ceará. Departamento de Química Analítica e Físico-Química., JHONYSON ARRUDA CARVALHO GUEDES, CNPAT, DIOGO DENARDI PORTO, CPATSA, MARIA FRANCILENE SOUZA SILVA, Universidade Federal do Ceará. Núcleo de Pesquisa e Desenvolvimento de Medicamentos (NPDM), GISELE SILVESTRE DA SILVA, CNPAT, PAULO RICELI VASCONCELOS RIBEIRO, CNPAT, and KIRLEY MARQUES CANUTO, CNPAT
- Subjects
Quimiometria ,Aroeira do sertão ,Vegetação Nativa ,Electrospray ionization ,Cytotoxicity ,Atividade citotóxica ,Mass spectrometry ,Myracrodruon Urundeuva ,Caatinga ,chemistry.chemical_compound ,Metabolomics ,Espécie Nativa ,Bioma Caatinga ,Phenols ,Chemometrics ,Myracrodruon urundeuva ,Chromatography ,biology ,General Chemistry ,biology.organism_classification ,Anacardic acids ,Aroeira ,chemistry ,Phytochemical ,UPLC-MS/MS ,visual_art ,visual_art.visual_art_medium ,Bark - Abstract
Myracrodruon urundeuva (aroeira-do-sertão) is a species threatened with extinction due to anthropogenic exploitation. Phytochemical analysis of bark, branch and leaf extracts revealed the presence of several compounds such as flavonoids, phenols, tannins, quercetin derivatives and anacardic acids. Dereplication methodology was performed to tentatively identify 50 compounds analyzed by ultra-performance liquid chromatography coupled with an electrospray ionization quadrupole time-of-flight mass spectrometry operating in MSE mode (UPLC-QTOF-MSE). The extracts exhibited anti-tumor effect in cancer cells HCT-116 (colorectal), SF-295 (glioblastoma), HL-60 (leukemia), and RAJI (leukemia). Also, these results correlate with the principal component analysis (PCA) data that identified three distinct groups indicating, efficiently, metabolic differences between organs of M. urundeuva. Through discriminatory analysis of the orthogonal partial least squares (OPLS-DA), the variable of importance in the projection (VIP) and S-Plot, we were able to determine 30 potential biomarkers. The fingerprint of hydroethanolic extracts was correlated with the cytotoxicity assay and demonstrated a significant difference in the composition of plant extract. Made available in DSpace on 2020-01-24T18:17:42Z (GMT). No. of bitstreams: 1 MetabolomicsBasedDiscoveryofBiomarkerswith2019.pdf: 3991156 bytes, checksum: 1d6d7fbdb69123f422ac2fdeac45d5cb (MD5) Previous issue date: 2019 On-line
- Published
- 2020
47. Marinobufagin, a molecule from poisonous frogs, causes biochemical, morphological and cell cycle changes in human neoplasms and vegetal cells
- Author
-
Daisy Jereissati Barbosa Lima, João Marcelo de Castro e Sousa, Gerardo M. Vieira-Júnior, Gardenia C.G. Militão, Manoel Odorico de Moraes, Lívia Queiroz de Sousa, Kátia da Conceição Machado, Domingos de Jesus Rodrigues, Mariana Helena Chaves, Bruno C. Cavalcanti, Janaina da Costa de Noronha, Bruno Marques Soares, Sarah Sant’Anna Maranhão, Ana Amélia de Carvalho Melo-Cavalcante, Cláudia Pessoa, and Paulo Michel Pinheiro Ferreira
- Subjects
Adult ,0301 basic medicine ,Erythrocytes ,Mitotic index ,Adolescent ,Cell Survival ,Meristem ,Antineoplastic Agents ,HL-60 Cells ,Toxicology ,Hemolysis ,Peripheral blood mononuclear cell ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,Onions ,medicine ,Animals ,Humans ,Cytotoxic T cell ,Viability assay ,Micronuclei, Chromosome-Defective ,Skin ,Dose-Response Relationship, Drug ,Chemistry ,Cell Cycle ,DNA Breaks ,General Medicine ,Cell cycle ,medicine.disease ,Molecular biology ,Bufonidae ,Healthy Volunteers ,Bufanolides ,Leukemia ,030104 developmental biology ,Apoptosis ,030220 oncology & carcinogenesis ,Leukocytes, Mononuclear ,DNA fragmentation ,Comet Assay - Abstract
Skin toad secretion present physiologically active molecules to protect them against microorganisms, predators and infections. This work detailed the antiproliferative action of marinobufagin on tumor and normal lines, investigate its mechanism on HL-60 leukemia cells and its toxic effects on Allium cepa meristematic cells. Initially, cytotoxic action was assessed by colorimetric assays. Next, HL-60 cells were analyzed by morphological and flow cytometry techniques and growing A. cepa roots were examined after 72 h exposure. Marinobufagin presented high antiproliferative action against all human tumor lines [IC50 values ranging from 0.15 (leukemia) to 7.35 (larynx) μM] and it failed against human erythrocytes and murine lines. Human normal peripheral blood mononuclear cells (PBMC) were up to 72.5-fold less sensitive [IC50: 10.88 μM] to marinobufagin than HL-60 line, but DNA strand breaks were no detected. Leukemia treaded cells exhibited cell viability reduction, DNA fragmentation, phosphatidylserine externalization, binucleation, nuclear condensation and cytoplasmic vacuoles. Marinobufagin also reduced the growth of A. cepa roots (EC50: 7.5 μM) and mitotic index, caused cell cycle arrest and chromosomal alterations (micronuclei, delays and C-metaphases) in meristematic cells. So, to find out partially targeted natural molecules on human leukemia cells, like marinobufagin, is an amazing and stimulating way to continue the battle against cancer.
- Published
- 2018
48. Chemical composition, antioxidant and antibacterial activities and evaluation of cytotoxicity of the fractions obtained fromSelaginella convoluta(Arn.) Spring (Selaginellaceae)
- Author
-
Ana Paula de Oliveira, Henrique Douglas Melo Coutinho, Grasielly Rocha Souza, Raimundo Gonçalves de Oliveira Júnior, Jackson Roberto Guedes da Silva Almeida, Irwin Rose Alencar de Menezes, Mariana Gama e Silva, Alessandra Gomes Marques Pacheco, Cláudia Pessoa, Marcília Pinheiro da Costa, Larissa Alves Ribeiro de Oliveira Macêdo, and Érica Martins de Lavor
- Subjects
Antioxidant ,Traditional medicine ,010405 organic chemistry ,Chemistry ,lcsh:Biotechnology ,medicine.medical_treatment ,antioxidant activity ,Selaginella convoluta ,01 natural sciences ,0104 chemical sciences ,Selaginellaceae ,010404 medicinal & biomolecular chemistry ,antibacterial activity ,lcsh:TP248.13-248.65 ,medicine ,chemical composition ,cytotoxicity ,Antibacterial activity ,Cytotoxicity ,Chemical composition ,Biotechnology - Abstract
The aim of this study was to evaluate the chemical composition, antioxidant and antibacterial activities and cytotoxicity of fractions from Selaginella convoluta, obtained by liquid–liquid extraction using hexane (Sc-Hex), chloroform (Sc-CHCl3) and ethyl acetate (Sc-AcOEt). The phenolic and flavonoid contents were measured by the Folin-Ciocalteu and aluminium chloride methods, respectively. Antioxidant activities were evaluated by using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and β-carotene-linoleic acid bleaching test. The antibacterial effect was evaluated by the method of microdilution and the cytotoxicity analysis in HCT-116 (colon), OVCAR-8 (ovarian) and SF-295 (brain) cells were carried out for MTT (3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide) test. The fractions were positive for the presence of anthracene derivatives, flavonoids, lignans, naphthoquinones, steroids and triterpenoids. The Sc-Hex and Sc-AcOEt showed good antioxidant activities. The fractions of S. convoluta demonstrated antibacterial activity and showed weak cytotoxicity. These activities were correlated with presence of phenolic compounds in active fractions.
- Published
- 2018
49. Explaining urokinase type plasminogen activator inhibition by amino-5-hydroxybenzimidazole and two naphthamidine-based compounds through quantum biochemistry
- Author
-
Hernandes F. Carvalho, Cláudia Pessoa, Valder N. Freire, Christian Solís-Calero, and Geancarlo Zanatta
- Subjects
Models, Molecular ,Protein Data Bank (RCSB PDB) ,General Physics and Astronomy ,Protonation ,Plasma protein binding ,Naphthalenes ,Conjugated system ,010402 general chemistry ,01 natural sciences ,0103 physical sciences ,medicine ,Humans ,Physical and Theoretical Chemistry ,Urokinase ,010304 chemical physics ,Chemistry ,Interaction energy ,Urokinase-Type Plasminogen Activator ,0104 chemical sciences ,Biochemistry ,Quantum Theory ,Benzimidazoles ,Density functional theory ,Plasminogen activator ,Protein Binding ,medicine.drug - Abstract
Urokinase plasminogen activator (uPA) is a biomarker and therapeutic target for several cancer types whose inhibition has been shown to slow tumor growth and metastasis. In this work, crystallographic data of uPA complexed with distinct ligands (PDB id: 1SQA, 1SQO, and 1FV9) were used to perform quantum biochemistry calculations based on the framework of density functional theory (DFT) and within the molecular fractionation with conjugated caps (MFCC) scheme. Our calculations revealed a total energy interaction of -107.30, -99.5, and -35.30 kcal mol-1 for two naphthamidine-based compounds (Ul1 and UI2) and 2-amino-5-hydroxybenzimidazole (172), respectively, which are in good agreement with known inhibitory experiments. Residues Asp189, Ser190, Cys191-Cys220, Gln192, Trp 215, Gly216, and Gly219 were identified as the main interacting amino acid residues with interaction energy contributions lower than -4.0 kcal mol-1 for uPA/UI1 and UPA/UI2 complexes. In the case of compound 172, our calculations have shown that the most important interactions occur with residues Asp189, Cys191-Cys220, and Ser190. Our results highlight the relevance of the protonation state of ligands and residues and that the naphthamidine scaffold of UI1 and UI2 is the main determinant of their potency, followed by their aminopyrimidine substitution. Altogether, the results of this work contribute to the understanding of the uPA binding mechanisms of the inhibitory compounds Ul1 and 172, stimulating the use of quantum biochemistry theoretical approaches for the development of new uPA inhibitors as new medicines for cancer treatment.
- Published
- 2018
50. Structural and spectroscopic analysis and evaluation of cytotoxic activity of 2-hydroxychalcones against human cancer cell lines
- Author
-
Cláudia Pessoa, Priscila Teixeira da Silva, Murilo S. S. Julião, Alexandre Magno Rodrigues Teixeira, Aldeneide Soares de Paiva, Francisco Washington Araújo Barros-Nepomuceno, A. C. H. Barreto, Daniel Pascoalino Pinheiro, Paulo Nogueira Bandeira, Pedro de Lima-Neto, Antonio Linkoln Alves Borges Leal, Francisco W.Q. Almeida-Neto, Hélcio Silva dos Santos, and Emmanuel Silva Marinho
- Subjects
Chalcone ,Organic Chemistry ,Carbon-13 NMR ,Quantum chemistry ,Analytical Chemistry ,Inorganic Chemistry ,chemistry.chemical_compound ,Ultraviolet visible spectroscopy ,chemistry ,Computational chemistry ,Proton NMR ,Molecular orbital ,Reactivity (chemistry) ,Spectroscopy - Abstract
Chalcones and their derivatives exhibit a broad spectrum of pharmacological activities, including antiproliferative activities. Accordingly, they are deemed robust anticancer candidates for cytotoxicity assays. Herein, we synthesized and characterized four chalcones using nuclear magnetic resonance (1H NMR and 13C NMR), Fourier transform Raman (FT-Raman), attenuated total reflection Fourier transform infrared (ATR-FTIR), and ultraviolet-visible (UV–vis) spectroscopy. Theoretical calculations of quantum chemistry were performed to obtain data regarding normal vibration modes, frontier molecular orbitals, molecular electrostatic potential maps, theoretical UV–vis spectra, and quantum chemical parameters expected for these chalcones. In addition, we evaluated the cytotoxic potential of these compounds. For synthesized compounds, quantum chemical calculations demonstrated excellent correlation with experimental data. The electronic properties revealed that chalcones 1 and 4 possess a higher electrophilic character, while chalcones 2 and 3 possess a higher nucleophilic character. Chalcone 3 demonstrated the highest value of HOMO energy, indicating the greatest propensity to donate electronic density among the four compounds. According to the HOMO-LUMO energy gap and global hardness, the reactivity of chalcones should follow the order 1
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.