9 results on '"Albuquerque, Flávia Peixoto"'
Search Results
2. Molecular mechanisms involved in the production of fetal hemoglobin in erythroblasts of patients with beta thalassemia major and in heterozygotic individuals with hereditary persistence of fetal hemoglobin (brazilian type)
- Author
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Albuquerque, Flávia Peixoto, 1992, Costa, Fernando Ferreira, 1950, Campos, Paula de Melo, Zorzetto, Nicola Amanda Conran, Traina, Fabíola, Araujo, Aderson da Silva, Universidade Estadual de Campinas. Faculdade de Ciências Médicas, Programa de Pós-Graduação em Fisiopatologia Médica, and UNIVERSIDADE ESTADUAL DE CAMPINAS
- Subjects
Transcriptoma ,Células F ,F cells ,Hemoglobina fetal ,Transcriptome ,Fetal Hemoglobin - Abstract
Orientador: Fernando Ferreira Costa Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas Resumo: A hemoglobina fetal (HbF) constituída essencialmente por duas cadeias de globina alfa e por duas cadeias gama, é produzida durante o período fetal e sua síntese decai logo após os seis meses de vida, sendo substituída gradativamente pela hemoglobina do adulto. Às assim denominadas, células 'F', representam uma pequena fração das células vermelhas do sangue que se originam a partir das células progenitoras eritroides imaturas. Os precursores dessas células mantêm a produção de HbF, através da ativação persistente dos genes da globina gama, dando origem a F reticulócitos e, em seguida amadurecem para as células F, onde é possível determinar a quantidade de hemoglobina fetal disponível na circulação sangüínea. Até agora, os pesquisadores não identificaram quais os fatores que levam ao acúmulo de hemoglobina fetal nas células F, apesar delas serem importantes para a manutenção do nível adequado de glóbulos vermelhos circulantes em pacientes com hemoglobinopatias. Pacientes com ß-talassemia Abstract: Fetal hemoglobin (HbF), consisting essentially of two alpha globin 'alfa' and two gamma 'gama' chains, is produced during the fetal development period and its synthesis declines after six months of life, being gradually replaced by adult hemoglobin (HbA). The so-called 'F' cells represent a small fraction of the red blood cells that originate from immature erythroid progenitor cells. The precursors of these cells maintain the production of HbF, through the persistent activation of gamma globin genes, giving rise to F reticulocytes and then mature into F cells, where it is possible to determine the amount of fetal hemoglobin available in the bloodstream. So far, researchers have not identified which factors lead to the accumulation of fetal hemoglobin in F cells, although they are important for maintaining an adequate level of circulating red blood cells in patients with hemoglobinopathies. Patients with ß-thalassemia... The abstract is available with the full electronic document Doutorado Fisiopatologia Médica Doutora em Ciências FAPESP 2018/01367-9
- Published
- 2022
3. LIN28B and ZBTB8B Genes Are Highly Expressed in Vitro in a CD34⁺ Cells Subpopulation of β-Thalassemia Major Patients and May be Involved in Increased HbF Production
- Author
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Albuquerque, Flávia Peixoto, primary, Sousa, Ingrid Grazielle, additional, Souza, Bruno Batista, additional, Maués, Jersey Heitor da S, additional, Lanaro, Carolina, additional, Albuquerque, Dulcinéia Martins de, additional, and Costa, Fernando Ferreira, additional
- Published
- 2021
- Full Text
- View/download PDF
4. Análise funcional do gene FOXO3 na indução de hemoglobina fetal em células K562
- Author
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ALBUQUERQUE, Flávia Peixoto and BEZERRA, Marcos André Cavalcanti
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Sangue – Doenças ,Doenças hereditárias - Abstract
CAPES As β-hemoglobinopatias são conhecidas como desordens genéticas com ampla distribuição mundial e prognóstico clínico crônico e variável. Essas patologias têm seus sintomas e sequelas amenizados com o aumento dos níveis de hemoglobina fetal (HbF; α2γ2). O único fármaco autorizado pelo Food and Drug Administration (FDA) é a hidroxiureia, que mesmo sendo eficiente para manutenção e controle do desenvolvimento das principais manifestações clínicas destes pacientes, necessita de pré-requisitos para o seu uso. O fator de transcrição Forkhead Box O 3 (FOXO3), foi descrito como um regulador fisiológico do processo maturativo eritróide e apontado como um regulador positivo dos níveis de HbF. No presente trabalho, avaliamos os níveis de expressão do gene FOXO3 em pacientes portadores de hemoglobinopatias e, para melhor entendermos sobre a fisiopatologia da doença, realizamos a subclonagem do gene FOXO3 em um sistema de expressão lentiviral, subseqüentemente avaliamos o seu papel como possível indutor positivo dos genes produtores das cadeias gama globínicas (HBG1 e HBG2). Na sequência, nós avaliamos a indução dos genes precursores de HbF (HBG1 e HBG2). No cenário clínico, a expressão do FOXO3 foi significativamente maior em pacientes portadores de doença falciforme quando comparado com doadores saudáveis (HbAA) e pacientes com β-talassemia (P
- Published
- 2018
5. Functional Analysis of the FOXO3 Gene on the Induction of Fetal Hemoglobin in K562 Cells
- Author
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Albuquerque, Flávia Peixoto, primary, Franca-Neto, Pedro Luis, additional, Franca, Rafael de Oliveira, additional, Araujo, Aderson da Silva, additional, Costa, Fernando F., additional, Bezerra, Marcos, additional, and Lucena-Araujo, Antonio R., additional
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- 2018
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6. BrazilianMorus nigraAttenuated Hyperglycemia, Dyslipidemia, and Prooxidant Status in Alloxan-Induced Diabetic Rats
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Júnior, Ivanildo I. da S., primary, Barbosa, Humberto de Moura, additional, Carvalho, Débora C. R., additional, Barros, Ruideglan de Alencar, additional, Albuquerque, Flávia Peixoto, additional, da Silva, Dionísio Henrique Amaral, additional, Souza, Grasielly R., additional, Souza, Nathália A. C., additional, Rolim, Larissa A., additional, Silva, Flaviane M. M., additional, Duarte, Glória I. B. P., additional, Almeida, Jackson R. G. da S., additional, Oliveira Júnior, Flávio Monteiro de, additional, Gomes, Dayane A., additional, and Lira, Eduardo C., additional
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- 2017
- Full Text
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7. Brazilian Attenuated Hyperglycemia, Dyslipidemia, and Prooxidant Status in Alloxan-Induced Diabetic Rats.
- Author
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Júnior, Ivanildo I. da S., Barbosa, Humberto de Moura, Carvalho, Débora C. R., Barros, Ruideglan de Alencar, Albuquerque, Flávia Peixoto, da Silva, Dionísio Henrique Amaral, Souza, Grasielly R., Souza, Nathália A. C., Rolim, Larissa A., Silva, Flaviane M. M., Duarte, Glória I. B. P., Almeida, Jackson R. G. da S., Oliveira Júnior, Flávio Monteiro de, Gomes, Dayane A., Lira, Eduardo C., Júnior, Ivanildo I da S, and de Oliveira Júnior, Flávio Monteiro
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HYPERGLYCEMIA ,DYSLIPIDEMIA ,ALLOXAN diabetes ,OXIDANT status ,LABORATORY rats - Abstract
Morus nigra has been used popularly for several proposes, including diabetic. In an attempt to support medicinal value, the acute hypoglycemic, hypolipidemic, and antioxidant effects of the ethanolic extract of Morus nigra (EEMn 200 or 400 mg/kg b.w.) were evaluated in normal and alloxan-induced diabetic treated for 14 days. Serum biochemical and antioxidant analysis were performed at the end of experiment. Oral glucose tolerance test was performed at 10th and 15th days. Chromatographic analysis by HPLC-DAD of EEMn was performed. Insulin was used as positive control to glycemic metabolism as well as fenofibrate to lipid metabolism. EEMn (400 mg/kg/day) reduced fasting and postprandial glycaemia, improved oral glucose tolerance, and reduced lipolysis and proteolysis in diabetic rats. EEMn decreased the blood levels of total cholesterol and increased HDL level when compared to the diabetic control rats. At higher levels, EEMn reduced triglycerides and VLDL levels in diabetic rats. Also, EEMn reduced malondialdehyde and increased the reduced glutathione levels in liver of diabetic rats. Chromatographic analysis identified the presence of the flavonoids rutin, isoquercetin, and kaempferitrin. Acute EEMn treatment reduced hyperglycemia, improved oral glucose tolerance, and minimized dyslipidemia and oxidative stress leading to a reduction in atherogenic index in alloxan-induced diabetic rats. [ABSTRACT FROM AUTHOR]
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- 2017
- Full Text
- View/download PDF
8. LIN28Band ZBTB8BGenes Are Highly Expressed in Vitroin a CD34⁺ Cells Subpopulation of β-Thalassemia Major Patients and May be Involved in Increased HbF Production
- Author
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Albuquerque, Flávia Peixoto, Sousa, Ingrid Grazielle, Souza, Bruno Batista, Maués, Jersey Heitor da S, Lanaro, Carolina, Albuquerque, Dulcinéia Martins de, and Costa, Fernando Ferreira
- Abstract
Patients with homozygous beta thalassemia and the β⁰β⁰ genotype produce almost only fetal hemoglobin and a small proportion of hemoglobin A2. However, in the bone marrow of these patients there are descriptions of two different subpopulations of erythroblasts, one with high production of HbF (High HbF cells) and another with low production of HbF (Low HbF cells). The High F cells are probably those that survive through erythropoiesis and originate the viable red blood cells. The molecular mechanisms that are responsible for this high production of HbF are not clear. Therefore, the central aim of our work was to study, in cultures of CD34⁺ cells from β⁰β⁰ patients, differentiated to erythrocytes in vitro, the molecular characteristics of cells related to high production of HbF (High HbF), compared to those with low production of HbF (Low HbF). For this purpose, peripheral blood was collected from patients and CD34⁺ cells were identified, and further differentiated in vitroand then isolated by flow cytometry (FACS Aria). After separating the High HbF and Low HbF groups, the cells were morphologically evaluated by optical and confocal microscopy and image cytometry. Next RNA was extracted from the pool of isolated cells and the RNA sequencing assay (RNAseq) was performed, so that it was possible to analyze the transcripts that were differentially expressed between each of the groups. Finally, we validated the sequencing data by real-time PCR. The sorting was performed on the 10th day of cell culture, when the cells presented a double labeling profile for anti-transferrin (CD71) and anti-glycophorin (CD235) antibodies, the mean intensity and fluorescence (MIF) of the markers was 1058 and 1365 for CD71 in healthy control and β-thalassemia groups, respectively, and for CD235 was 430 in controls and 516 for patients. The cells were in an intermediate stage of maturation. After the isolation of sub-populations of High HbF and Low HbF cells, confocal microscopy indicated a clear difference in the intracellular HbF levels of the analyzed cells, confirming that the sorting by cytometry had occurred as desired. Imaging cytometry analysis revealed a MIF of 7.8 x 10⁵ for High HbF cells and 1.7 x 10⁵ for Low HbF cells, when we assessed the cell pools and when single cells were studied, these values ranged from 2.2 x 10⁵ for Low HbF cells to 1.9 x 10⁶ of mean intensity and fluorescence for High cells. After all data generated by RNAseq were filtered, we obtained a list of 16 enriched and differentially-expressed genes between High HbF and Low HbF cells. From these genes, it was possible to identify two that were apparently associated with the increased production of fetal hemoglobin, the genes ZBTB8Band LIN28B. ZBTB8Bis a protein-coding gene with a zinc finger domain and may be involved in transcriptional regulation, it was included in our analyses since this gene is part of the same family as ZBTB7A, an important transcription factor that represses several genes involved in cell differentiation and proliferation and that has already been described as a regulator of HbF production. The LIN28Bgene encodes an RNA-binding protein, which is described as a possible regulator of HbF levels during fetal development, by increasing the expression of gamma globin, culminating in the increase of intracellular levels of fetal hemoglobin through a direct action on the let-7 microRNA family and BCL11A gene.These results not only contribute to a better understanding of the mechanisms of gene regulation involved in the production of HbF, but indicate a potential new therapeutic approach to increase the production of HbF in hemoglobinopathies.
- Published
- 2021
- Full Text
- View/download PDF
9. Brazilian Morus nigra Attenuated Hyperglycemia, Dyslipidemia, and Prooxidant Status in Alloxan-Induced Diabetic Rats.
- Author
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Júnior IIDS, Barbosa HM, Carvalho DCR, Barros RA, Albuquerque FP, da Silva DHA, Souza GR, Souza NAC, Rolim LA, Silva FMM, Duarte GIBP, Almeida JRGDS, de Oliveira Júnior FM, Gomes DA, and Lira EC
- Subjects
- Alloxan, Animals, Blood Glucose analysis, Brazil, Glucose Tolerance Test, Liver metabolism, Rats, Rats, Wistar, Diabetes Mellitus, Experimental drug therapy, Dyslipidemias drug therapy, Hyperglycemia drug therapy, Hypoglycemic Agents pharmacology, Morus chemistry, Plant Extracts pharmacology
- Abstract
Morus nigra has been used popularly for several proposes, including diabetic. In an attempt to support medicinal value, the acute hypoglycemic, hypolipidemic, and antioxidant effects of the ethanolic extract of Morus nigra (EEMn 200 or 400 mg/kg b.w.) were evaluated in normal and alloxan-induced diabetic treated for 14 days. Serum biochemical and antioxidant analysis were performed at the end of experiment. Oral glucose tolerance test was performed at 10th and 15th days. Chromatographic analysis by HPLC-DAD of EEMn was performed. Insulin was used as positive control to glycemic metabolism as well as fenofibrate to lipid metabolism. EEMn (400 mg/kg/day) reduced fasting and postprandial glycaemia, improved oral glucose tolerance, and reduced lipolysis and proteolysis in diabetic rats. EEMn decreased the blood levels of total cholesterol and increased HDL level when compared to the diabetic control rats. At higher levels, EEMn reduced triglycerides and VLDL levels in diabetic rats. Also, EEMn reduced malondialdehyde and increased the reduced glutathione levels in liver of diabetic rats. Chromatographic analysis identified the presence of the flavonoids rutin, isoquercetin, and kaempferitrin. Acute EEMn treatment reduced hyperglycemia, improved oral glucose tolerance, and minimized dyslipidemia and oxidative stress leading to a reduction in atherogenic index in alloxan-induced diabetic rats.
- Published
- 2017
- Full Text
- View/download PDF
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