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TNF-α induces apoptosis of Molt-4 cells and cell cycle specificity of Bcl-2 phosphyrylation

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收录情况： ◇ 统计源期刊

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单位： [1]Institute of Public Health,Henan University,Kaifeng 475004,China [2]Cancer Research Institute,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,Wuhan 430030,China

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关键词： apoptosis Bd-2 phosphorylation cell cycle

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Objective:The aim of the study was to observe the expression of Bcl-2 and its phosphorylation in Molt-4 cells induced by tumor necrosis factor-α(TNF-α),and to investigate the possible mechanism of cell cycle specificity of apoptosis.Methods:Exponentially growing Molt-4 cells were treated with TNF-α.Apoptosis was detected by DNA fragmentation assay.API method was applied to illustrate the cell cycle specificity of apoptotic cells.Cells of sub-phases were sorted by FACSvantage flow cytometer and then submitted to immunoblot.Results:Molt-4 cells which were treated with TNF-α went to apoptosis and showed a DNA ladder pattern.Most apoptosis happened in G1-phase of cell cycle.Bcl-2 expression increased for the Molt-4 cells treated with TNF-α.The phosphorylation state of Bcl-2 was only presented in G1-phase cells,in accordance with the specified time and cell cycle phase of apoptosis.Conclusion:The phosphorylation of Bcl-2 in the Molt-4 cells treated with TNF-α happened with the same cell cycle specificity as cell apoptosis.The cell cycle specificity of Bcl-2 phosphorylation was one of the mechanisms of receptor-mediated apoptosis.The cell cycle machine can trigger the apoptosis program.

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