首页> 外文期刊>Cell biology international. >Apoptosis induced by gamma irradiation in peripheral blood mononuclear cells is not mediated by cytochrome-c release and only partially involves caspase-3-like proteases.
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Apoptosis induced by gamma irradiation in peripheral blood mononuclear cells is not mediated by cytochrome-c release and only partially involves caspase-3-like proteases.

机译:γ射线在外周血单核细胞中诱导的凋亡不是由细胞色素c释放介导的,而仅部分涉及caspase-3样蛋白酶。

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Caspase 3 has been shown to be actively involved in the apoptotic process in thymocytes after gamma-irradiation. We examined caspase 3 activation in mature peripheral blood lymphocytes (PBL) after gamma irradiation. Since the activation of caspase 3 is generally prceded by a decrease in mitochondrial membrane potential (delta psi m) and cytochrome c release, these two parameters were also examined. Apoptosis in PBL after a 5-Gy gamma irradiation, is characterized by a decrease in delta psi m, but surprisingly no release of cytochrome-c and only a weak caspase 3 activation was noticed. In contrast, staurosporin treated PBL showed a decrease in delta psi m with cytochrome-c release and a clear caspase 3 activation. We were unable to block the decrease in delta psi m with the caspase-inhibitors zVAD-fmk or zDEVD-fmk after gamma irradiation, but DNA fragmentation as measured by the TUNEL assay was partially inhibited. Therefore, in gamma irradiated mature PBL, caspase-dependent and -independent pathways, but not cytochrome c, seem to be involved in the apoptotic process.
机译:Caspase 3已被证明在γ射线照射后能积极参与胸腺细胞的凋亡过程。我们检查了γ射线照射后成熟外周血淋巴细胞(PBL)中的caspase 3激活。由于胱天蛋白酶3的激活通常是通过线粒体膜电位(δpsi m)和细胞色素c释放的降低来进行的,因此还检查了这两个参数。 5-Gyγ射线照射后PBL中的凋亡特征是psim降低,但令人惊讶的是,没有细胞色素c的释放,只有半胱天冬酶3的激活很弱。相比之下,星形孢菌素处理的PBL表现出psim降低,并伴有细胞色素c释放和明显的caspase 3活化。在伽玛射线照射后,我们无法用半胱天冬酶抑制剂zVAD-fmk或zDEVD-fmk来阻止delta psi m的降低,但通过TUNEL分析测定的DNA片段化被部分抑制。因此,在γ射线辐照的成熟PBL中,caspase依赖性和非依赖性途径似乎不参与细胞凋亡过程,而细胞色素c则不参与。

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