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Expression of BAX in cell nucleus after experimentally induced apoptosis revealed by immunogold and embedment-free electron microscopy.

机译:通过免疫金和无嵌入电子显微镜观察到,实验诱导的细胞凋亡后BAX在细胞核中的表达。

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摘要

The unique combination of immunocytochemistry with embedment-free electron microscopy was applied for precise and specific localisation of BAX in the human colon adenocarcinoma COLO 205 cell line stimulated to undergo apoptosis by camptothecin (DNA topoisomerase I inhibitor). Camptothecin-induced apoptosis was associated with redistribution of BAX from cytosol to organelle membranes: mitochondria, Golgi apparatus, endoplasmic reticulum and via nuclear envelope pores to the nucleus, occurring within 60-180 min of cell exposure to the drug. An increase in BAX immunoreactivity on fine filaments and the lamina-pore complex of the nuclear matrix was also observed. The increase in BAX expression in the nuclear area of camptothecin-treated COLO 205 cells was confirmed by quantitative analysis using laser scanning cytometry. The subcellular translocations of BAX preceded the appearance of any morphological symptoms of apoptosis. Copyright 2001 Academic Press.
机译:免疫细胞化学与无嵌入电子显微镜的独特结合被应用于BAX在喜树碱(DNA拓扑异构酶I抑制剂)刺激下发生凋亡的人结肠腺癌COLO 205细胞系中的精确和特异性定位。喜树碱诱导的细胞凋亡与BAX从胞质溶胶到细胞器膜的重新分布有关:线粒体,高尔基体,内质网以及通过核被膜孔到达细胞核,发生在暴露于药物的60-180分钟内。还观察到细丝和核基质的层孔复合物上的BAX免疫反应性增加。通过使用激光扫描细胞术的定量分析证实了喜树碱处理的COLO 205细胞核区域BAX表达的增加。 BAX的亚细胞易位先于凋亡的任何形态学症状出现。版权所有2001,学术出版社。

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