膜受体介导的细胞凋亡与细胞周期的关系

背景与目的：线粒体介导的细胞凋亡大部分与细胞周期相关,但膜受体介导的细胞凋亡是否与细胞周期有关尚不清楚。本研究旨在观察膜受体介导的人类细胞凋亡与细胞周期特异性,阐明膜受体介导的细胞凋亡与细胞周期的关系。方法：用肿瘤坏死因子-α、抗Fas抗体分别处理指数生长期的Molt-4、Jurkat以及健康人外周血淋巴细胞;应用Annexin V／PI和API等方法,通过流式细胞仪检测细胞凋亡和细胞周期特异性。结果：处于静止期的外周血淋巴细胞对凋亡诱导剂不敏感,凋亡率是6％-8％。Molt-4、Jurkat细胞以及加入植物血凝素刺激的外周血淋巴细胞经肿瘤坏死因子-α、抗Fas抗体诱导后出现了明显的细胞凋亡．凋亡率是15％-28％。膜受体介导的细胞凋亡主要发生在细胞周期的早G1期。结论：膜受体介导的细胞凋亡与细胞周期相关,具有细胞周期特异性。

Correlation of receptor-mediated apoptosis to cell cycle

BACKGROUND & OBJECTIVE: Chondriosome-mediated apoptosis is closely related to cell cycle, however, the correlation of receptor-mediated apoptosis to cell cycle progression is unclear yet. This study was to observe the receptor-mediated apoptosis and cell cycle specificity in cultured normal and tumor lymphocytes, and investigate their correlation. METHODS: Exponentially growing human leukemia cell lines Molt-4 and Jurkat were treated with tumor necrosis factor-alpha (TNF-alpha) or Anti-Fas. Peripheral blood lymphocytes (PBLs) from healthy donors were stimulated by phytohemagglutinin (PHA), and further incubated with the presence of TNF-alpha or anti-Fas. Annexin V/PI was used to detect the apoptosis, and API method was used to illustrate the cell cycle specificity of apoptotic cells. RESULTS: Unstimulated PBLs kept blunt to stimulation with TNF-alpha or anti-Fas, and the apoptotic rate was 6%-8%. Molt-4 cells, Jurkat cells, and stimulated PBLs which were treated with TNF-alpha or anti-Fas went to apoptosis, and the apoptosis rates were 15%-28%. Most receptor-mediated apoptosis happened in early G1 phase. CONCLUSION: Receptor-mediated apoptosis is closely related to cell cycle and presents cell cycle specificity.