Biotechnology & nanotechnology
Akbar Safipour Afshar; fateme Saied Nematpour
Volume 27, Issue 4 , November and December 2020, , Pages 550-558
Abstract
Introduction: Green synthesis of silver nanoparticles is a simple and low-cost method. In addition, finding new therapeutic effects for silver nanoparticles is considered as an attractive field in cancer research. In the present study, synthesis of silver nanoparticles was performed by aqueous leaf extract ...
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Introduction: Green synthesis of silver nanoparticles is a simple and low-cost method. In addition, finding new therapeutic effects for silver nanoparticles is considered as an attractive field in cancer research. In the present study, synthesis of silver nanoparticles was performed by aqueous leaf extract of barberry. The effects of Ag nanoparticles were evaluated on cell viability and expression levels of ODC1 gene of the human breast cancer cell line (MDA-MB-231).
Materials and Methods: The synthetic nanoparticles were analyzed by UV-vis spectrophotometry and Transmission Electron Microscopy. The cultured cancer cells were treated under different concentrations of synthesized nanoparticles.The viability of the cells was analyzed by MTT assay and relative expression of ODC1 gene by Real-Time PCR.
Results: TEM photomicrographs showed that the spherical silver nanoparticles have been synthesized with an average size of 16 nm. The results showed cytotoxicity of silver nanoparticles in a time and dose-dependent manner. The average IC50 calculated was 16.48 µg/ml. The results also showed that silver nanoparticles decreased ODC1 gene expression levels about 4 folds at 20 µg/ml nanoparticles compared to control.
Conclusion: It seems that green synthesized silver nanoparticles through the gradual release of silver ions in the acidic environment of the cancer cells and production of oxygen radicals, as well as reduction of ODC1gene expression cause diminish of cancer cell viability.
Biotechnology & nanotechnology
Zeinab Noori; Akbar Safipour Afshar
Volume 26, Issue 4 , November and December 2019, , Pages 527-534
Abstract
Aim: The characteristics of cancer cells that differentiate them from normal cells can be attributed to the increase of the ornithine decarboxylase enzyme (ODC), which has a very important role in the metabolism of polyamines in cancer cells. In this research, we tried to study the effects of cytotoxicity ...
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Aim: The characteristics of cancer cells that differentiate them from normal cells can be attributed to the increase of the ornithine decarboxylase enzyme (ODC), which has a very important role in the metabolism of polyamines in cancer cells. In this research, we tried to study the effects of cytotoxicity of Rhubarb extract on three different solvents distilled water, ethanol and n-hexane on MCF-7 cell lines. Also, the rate of expression of the ODC1 gene as one of the genes involved in breast cancer was studied under the influence of the extract of this plant.Materials and Methods: MCF-7 breast cancer cells were cultured in DMEM medium. Subsequently, they were subjected to increasing concentrations of extract from 0-200 μg/mL. The cytotoxic activity of the extract was investigated using MTT assay. The quantitative analysis of the ODC1 gene was performed using the Real Time-PCR.Results: Cell line mortality increases significantly in a concentration-dependent manner. In the rhubarb extracts, the most cytotoxicity was observed in 72 hours. Changes in ODC1 gene expression in MCF-7 cell lines treated with different concentrations of rhubarb extract indicate a decrease in gene expression with increasing concentrations of extracts.Conclusion: The results of this study indicate that Rhubarb extract has a potential influence on ODC1 gene expression in breast cancer cells and cause inhibition of cancer cell proliferation.