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Showing 3 results for Cell Cycle
Apoptosis Induction in Glioma Cells by Downregulation of HIF-1α Gene
S. Mohebbi , M. Behmanesh , M. Nikkhah , T. Tohidi Moghadam ,
Volume 9, Issue 1 (1-2018)
Abstract
Aims: HIF-1 transcription factor is a key determinant of oxygen-dependent gene regulation, which its role has been demonstrated for the survival and progress of cancer tumors. The effect of suppression of HIF-1α on the evaluation of HIF-1 dependent processes and interference with pathophysiological events caused by hypoxia is important. The aim of this study was the apoptosis induction in glioma cells by downregulation of Hif-1α gene.
Materials and Methods: In this experimental study, a specific siRNA against the HIF1α gene was developed using OligoWalk and Mit (siRNA.wi.mit.edu) servers and the online design department of Invivogene and Qiagene companies and the efficacy of its silencing in the U87 glioma cell line was quantitatively investigated by the Real-time PCR technique. In order to find out the effect of reduction of expression in the process of cell cycle and apoptosis, staining with PI and Annexin-PI was performed and the number of cells in each phase and the rate of cell mortality with control were compared by flow cytometry.
Findings: The designed HIF-1a-siRNA was able to reduce HIF1α expression by 40%. The treatment of U87 cells after 24 hours increased the cells by 6% and after 48 hours, increased them by 12% in the sub G1 stage. Confirming the cell cycle changes, 48-hour treatment induced apoptosis in 58% of cells; regarding the 1.5% rate of apoptosis in the control cells, this cell death rate was very significant and showed the ability of the designed siRNA to induce apoptosis.
Conclusion: The apoptosis induction of specific siRNA designed against HIF1α gene has a significant effect on the reduction of HIF-1α gene expression, cell growth, and apoptosis.

Study the effects of static magnetic field on Cell Cycle progression in mesenchymal bone marrow stem cells of rat

Volume 11, Issue 0 (10-2009)
Abstract
Objective: The environmental exposure to Magnetic Fields (MFs) may interact with biological systems. MFs are generated from various sources such as power lines, electric appliances at homes and offices, electrified transportation systems including urban railway systems and diagnostic devices such as Magnetic Resonance Imaging (MRI). There are some scientific evidences that imply the exposure to MFs are hazardous to our health and increases the rate of some cancers like leukemia. The biological consequences of exposure to MFs have been investigated from a variety of endpoints. However, most studies have been performed in vitro and have examined effects on cellular processes and its malfunction; such studies can be used as evidence of effects in vivo. Materials and Methods: In this study Bone Marrow Stem Cells were grown in the absence and in the presence of a 15 mT Static Magnetic Field for 5 hours in order to determine any changes in cell cycle progression using the count of cells in different phases. The count of cells in a special phase of cell cycle indicates the length of that phase. The Static Magnetic Field was performed using a locally designed MF generator. Results: A significant increase in the number of cells in G0/G1 was observed in comparison with the controls. Also the number of cells in G0/G1 in the cells treated with Hydrogen-Peroxide, as an oxidative agent, was significantly increased in Static MF. Conclusion: Genetic material damages or mal-function of related proteins may cause these halts. Mfs have not enough energy to affect the biological molecules directly but the mechanism of free radical mediators is probable. These kinds of damages (direct or indirect) can permanently bring the cell cycle to a halt.
Effect of hydroalcoholic extract of Lavender on apoptosis of liver cancer cells (HepG2)

Volume 23, Issue 4 (6-2020)
Abstract
Objective: Despite many advances in cancer treatment and control, significant deficiencies remain and the rate of cancer growth is increasing. Due to the side effects of using chemicals and radiation, the use of herbs can have fewer side effects for the patient. The aim of this study was to investigate the potential anticancer effects of alcoholic extract of Lavender on inhibition and growth of HepG2 cell lines.
Materials and Methods: In this study, the effect of alcoholic extract of lavender (10,100,1000 and 1 μg / ml) on HepG2 liver cancer cell line was studied. MTT assay was used to evaluate the toxicity of lavender extract and cell viability. Cell cycle changes were assessed using a flow cytometer.
Oxygen-free species production and membrane lipid peroxidation were also measured. 
Results: Results showed that alcoholic extract of Lavender has anti-cancer effect on HepG2 cell line. After confirming the effect of lavender extract on cell cycle, the results obtained from the evaluation of membrane lipid peroxidation and production of free reactive species were also significant.
Conclusion: According to the results of this study, the alcoholic extract of Lavender was reported as a potential anticancer agent and is one of the therapeutic strategies in liver cancer.
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