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首页> 外文期刊>Cellular immunology >Caspase-independent cell death without generation of reactive oxygen species in irradiated MOLT-4 human leukemia cells.
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Caspase-independent cell death without generation of reactive oxygen species in irradiated MOLT-4 human leukemia cells.

机译:辐照过的MOLT-4人白血病细胞中不依赖半胱天冬酶的细胞死亡而未产生活性氧。

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摘要

To improve our understanding of ionizing radiation effects on immune cells, we investigated steps leading to radiation-induced cell death in MOLT-4, a thymus-derived human leukemia cell. After exposure of MOLT-4 cells to 4 Gy of X-rays, irradiated cells sequentially showed increase in intracellular reactive oxygen species (ROS), decrease in mitochondrial membrane potential, and eventually apoptotic cell death. In the presence of the caspase inhibitor z-VAD-fmk, irradiated cells exhibited necrotic characteristics such as mitochondrial swelling instead of apoptosis. ROS generation was not detected during this necrotic cell death process. These results indicate that radiation-induced apoptosis in MOLT-4 cells requires elevation of intracellular ROS as well as activation of a series of caspases, whereas the cryptic necrosis program--which is independent of intracellular ROS generation and caspase activation--is activated when the apoptosis pathway is blocked.
机译:为了增进我们对电离辐射对免疫细胞影响的理解,我们研究了导致胸腺来源的人类白血病细胞MOLT-4中辐射诱导的细胞死亡的步骤。将MOLT-4细胞暴露于4 Gy的X射线后,被辐照的细胞依次显示细胞内活性氧(ROS)增加,线粒体膜电位降低,并最终导致凋亡细胞死亡。在胱天蛋白酶抑制剂z-VAD-fmk的存在下,受辐照的细胞显示出坏死特性,例如线粒体肿胀而不是凋亡。在此坏死细胞死亡过程中未检测到ROS生成。这些结果表明,辐射诱导的MOLT-4细胞凋亡需要升高细胞内ROS并激活一系列胱天蛋白酶,而隐性坏死程序(与细胞内ROS的产生和胱天蛋白酶的激活无关)在激活时被激活凋亡途径被阻断。

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