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Background: Photothermal therapy (PTT) is one of the effective and non-invasive strategies which hold great promise for improving the treatment of cancer cells. PTT is based on activating a photosensitizer by infrared light irradiation and producing heat and reactive species and apoptosis in the tumor area. Objective: The aim of this study was to investigate the effect of photothermal/chemotherapy on melanoma cancer cells using poly (2-amino phenol)/gold (P2AO/AuNPs) and doxorubicin (DOX). Material and Methods: In this experimental study, nanoparticles of P2AO/AuNPs were synthesized, and their mixture with DOX was applied as a photosensitizer for photothermal/chemotherapy of a C540 (B16-F10) melanoma cell line. Results: P2AO/AuNPs generated heat and cytotoxic responsive oxygen species (ROS) upon 808-nm light irradiation with simultaneous intensifying DOX therapeutic effect under domination of synergism effects between light irradiation, P2AO/AuNPs, and doxorubicin. Cell treatment with both P2AO/AuNPs and DOX resulted in a considerable increase in necroptotic cells to 61% with a significant decrease in the living cells (39%). Conclusion: P2AO/AuNPs provided a platform for light absorption and intensifying DOX therapeutic effect. This study approved the applicability of a new photothermal/chemotherapy by domination of synergistic effects attained by combination of laser light, P2AO, AuNPs, and DOX. [ABSTRACT FROM AUTHOR]

Background: Docetaxel (DXL) is an antineoplastic agent for cancer treatment, the therapeutic efficiency of which is limited due to low solubility, hydrophobicity, and tissue specificity. Objective: In this study, nano-niosomes were introduced for improving therapeutic index of DXL. Material and Methods: In this experimental study, two nano-niosomes were synthesized using Span 20® and Span 80® and a thin film hydration method with DXL loading (DXL-Span20 and DXL-Span80). Characterization, in-vitro cytotoxicity and bioavailability of the nano-niosomes was also evaluated via in-vivo experiments. Results: DXL-Span20 and DXL-Span80 have vesicles size in a range of 84-90 nm and negative zeta potentials. DXL entrapment efficiencies were obtained as 69.6 and 74.0% for DXL-Span20 and DXL-Span80, respectively; with an in-vitro sustained release patterns. Cytotoxicity assays were performed against MDA-MB-231, Calu-6, and AsPC-1 cell lines, and the results indicated that DXL loading into nano-niosomes led to decrement in values of half-maximal inhibitory concentration (IC50) at least 2.5 times and at most 6.5 times, compared to free DXL. Moreover, the rat blood bioavailability of DXL after intraperitoneal administration and the pharmacokinetic parameters indicated higher DXL plasma level and the higher effectiveness of DXL-Span80 compared to DXL-Span20. Conclusion: Carrying DXL by the nano-niosomes led to enhanced cytotoxicity (and lower IC50 values) and higher efficacy with enhanced pharmacokinetic parameters. [ABSTRACT FROM AUTHOR]

The influenza virus is a pervasive pathogen that exhibits increased prevalence during colder seasons, resulting in a significant annual occurrence of infections. Notably, pharmaceutical interventions effective against influenza A strains often exhibit limited efficacy against influenza B variants. Against this backdrop, the need for innovative approaches to accurately and swiftly differentiate and detect influenza B becomes evident. Biosensors play a pivotal role in this detection process, offering rapid, specific, and sensitive identification of the virus, facilitating timely intervention and containment efforts. Oligonucleotide sequences targeting the conserved B/Victoria/2/87 influenza virus NP region were designed. Nasopharyngeal swabs were collected from patients suspected of influenza virus infection, and viral RNA was extracted. RNA quality was assessed through one‐step PCR. cDNA synthesis was performed using random hexamers, and real‐time PCR quantified the influenza genome. Gold nanoparticles were immobilized on a surface to immobilize the specific DNA probe, and electrochemical hybridization was electrochemically followed. The biosensor exhibited high selectivity and effective distinction of complementary sequences from mismatches and influenza virus cDNA genome. The biosensor successfully detected the influenza B virus genome in real samples. Non‐influenza samples yielded no significant hybridization signals. The comparison between the results obtained from the biosensor and real‐time PCR revealed full agreement of these methods. The biosensor utilized electrochemical detection of hybridization and proved effective in detecting the influenza B virus genome with high specificity, sensitivity, and selectivity. Comparative analysis with real‐time PCR underscored the accuracy and potential applicability of the biosensor in rapid and specific virus detection. This innovative approach holds promise for future diagnostic and epidemiological applications in detecting influenza B virus and other pathogens. [ABSTRACT FROM AUTHOR]

The visceral form of leishmaniasis (VL), due to infection by Leishmania infantum, is a neglected tropical disease. The accessible therapeutic options are limited. Artemisinin is an efficient antileishmanial product with poor biological availability that requires high repetition of therapeutic doses in VL. Solid lipid nanoparticles (SLNs) provide targeted delivery, increase bioavailability and reduce toxicity of the traditional therapeutic strategy. The spherical shape artemisinin-loaded SLNs were prepared in a particle diameter of 222.0 ± 14.0 nm. The SLNs showed no particular toxic effect on the parasites, whereas the native artemisinin demonstrated a significant toxicity rate of 31% in viability of the promastigotes at the 250 µg/ml concentration. The therapeutic efficacy of the artemisinin-loaded SLNs was demonstrated in the experimental VL, using the L. infantum-infected BALB/c mice, in the present study. The 10 and 20 mg/kg doses of artemisinin-loaded SLNs showed higher level of antileishmanial efficacy compared with the free artemisinin. There was a significant diminishing of the parasite burden in liver (84.7 ± 4.9%) and spleen (85.0 ± 3.1%) and hepatosplenomegaly by the artemisinin-loaded SLNs treated at 20 mg/kg compared to the free artemisinin. Therefore, the present study supports the superior efficacy of artemisinin-loaded SLNs over the free artemisinin and could be considered as a new therapeutic strategy in the treatment of leishmaniasis. [ABSTRACT FROM AUTHOR]

Shale-like copper nanostructure was synthesized for the first time from a water-in-oil microemulsion medium comprising Triton™ X-100/cyclohexane/water ternary system. The nanoshales were synthesized through chemical reduction by hydrazinium hydroxide in alkaline medium. The nanoshales were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) patterns.

Background: Alzheimer's disease (AD) is a common form of dementia, characterized by production and deposition of β-amyloid peptide in the brain. Thus, β-amyloid peptide is a potentially promising biomarker used to diagnose and monitor the progression of AD. Objective: The study aims to develop a biosensor based on a molecularly imprinted poly-pyrrole for detection of β-amyloid. Material and Methods: In this experimental study, an imprinted poly-pyrrole was employed as an artificial receptor synthesized by electro-polymerization of pyrrole on screen-printed carbon electrodes in the presence of β-amyloid. β-amyloid acts as a molecular template within the polymer. The biosensor was evaluated by cyclic voltammetry using ferro/ferricyanide marker. The parameters influencing the biosensor performance, including electro-polymerization cycle umbers and β-amyloid binding time were optimized to achieve the best biosensor sensitivity. Results: The β-amyloid binding affinity with the biosensor surface was evaluated by the Freundlich isotherm, and Freundlich constant and exponent were obtained as 0.22 ng mL-1 and 10.60, respectively. The biosensor demonstrated a detection limit of 1.2 pg mL-1. The biosensor was applied for β-amyloid determination in artificial cerebrospinal fluid. Conclusion: The biosensor is applicable for early Alzheimer's disease detection. [ABSTRACT FROM AUTHOR]

In the present study, nanoparticles of copper and copper oxides were synthesized and their antibacterial activity was evaluated and compared with silver nanoparticles. The nanoparticles were synthesized using facile chemical reactions, and then characterized using field emission scanning microscopy. The nanoparticles were stable for at least two weeks. The antibacterial activity of the nanoparticles against Staphylococcus aureus, Bacillus subtilis, Pseudomonas aeruginosa, Enterococcusfaecalis and Escherichia coli was investigated based on inhibition zone in disk diffusion assay. The minimum inhibitory concentration and minimum bactericidal concentration of the nanoparticles were also reported. Antibacterial activity of the nanoparticles showed better inhibitory activity against gram positive bacteria. [ABSTRACT FROM AUTHOR]