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Background and Objectives: Various studies have shown that sex steroids affect cancer cells at cellular and molecular level. In this study, the anti-proliferation effects of testosterone, was investigated on gastric cancer cell line (AGS) and activity level of caspase-3, -8 and -9, was evaluated. Methods: In this laboratory experimental study, AGS cell line, were randomly divided into control group (no exposure to hormone) and groups received testosterone (at concentrations 0.001, 0.01, 0.1, 1, and 10mg/ml). The cytotoxic effect of the extract was measured using MTT assay method. Caspase-3, -8 and -9 activity level was also evaluated using ELISA method. The data were statistically analyzed between groups using one way ANOVA and student’s t-test. Results: Testosterone at the concentrations of 0.1 and 1mg/mL significantly reduced the viability of AGS cells compared to the control group (p

Background and Objectives: Breast cancer is one of the most common cancers in women around the world. Problems, such as treatment failure, drug resistance, heavy costs, other problems associated with the treatment of this type of cancer, have attracted the interest of many researchers to cyanobacteria, since these microorganisms have fewer side-effects compared to chemical drugs. In the present research, the effect of Oscillatoria extract was investigated on the viability of MCF7 cell line as well as caspase-9 gene expression. Methods: In this experimental study, MCF7 cell lines, were treated with different concentrations of extract of Oscillatoria cyanobacteria (0.078, 0.15, 0.3, 0.6, 1.2, 2.5, 5, and 10mg/ml) for 24 hours. The effect of the extract on cell viability was assessed using MTT assay. Then, RNA extraction was carried out, and after synthesis of cDNA, real time PCR was performed to assess the expression rate of caspase-9 gene. Results: With increasing the concentration of the extract, cell viability significantly decreased compared to the control sample. Real time PCR results also showed that the expression of caspase-9 gene increased by 5.59 ± 0.83 (p

Background and Objectives: Studies have shown that drugs can affect on proliferation of cancer cells. The main aim of this study was to determine the effects of diclofenac on caspase-8 and caspase-9 activity in cervical cancer cells (HeLa) in cell culture. Methods: In this experimental-laboratory study, HeLa cancer cells were purchased from Iran Cell Bank (Pasteur Institute, Tehran, Iran). HeLa cancer cells were cultured in DMEM culture media enriched with 10% FBS, stored in 6 well plate, and incubated for 24 hour. Then, cells were exposed to different concentrations of diclofenac and the viability of cells was evaluated by MTT assay, and the IC50 dose was calculated. The activity of Caspase-8 and caspase-9 on heLa cells, was assayed by ELISA method. The data were analyzed using one-way analysis of variance, Kolmogorov-Smirnov, and Tukey tests. Results: Findings showed that 0.1, 1, and 10mg/ml doses of diclofenac decrease the viability of HeLa cancer cells compared to the control group (p0.05). Conclusion: The results of this study revealed that diclofenac has cytotoxic effects on HeLa cancer cells. Although ths effect is different based on the dose used. &nbsp