Endogenous endonuclease-induced DNA fragmentation: an early event in cell-mediated cytolysis
摘要：
Within minutes of exposure of target cells to cytotoxic T lymphocytes, their nuclear DNA begins to be fragmented. This phenomenon precedes51Cr release by at least an hour. DNA fragmentation occurs only when appropriately sensitized cytotoxic T cells are used and is not merely a result of cell death because killing of target cells by heating, freeze/thawing, or lysing with antibody and complement did not yield DNA fragments. Agarose gel electrophoresis of target cell DNA showed discrete multiples of an approximately 200-base-pair subunit, suggesting that fragmentation was the result of activation of a specific endonuclease. A similar pattern of DNA fragments is observed during glucocorticoid-induced killing of mouse thymocytes. The endonuclease in that case is inhibited by zinc ions, and we find that Zn2+also inhibits DNA fragmentation and51Cr release induced by cytotoxic T cells, suggesting a final common biochemical pathway for both types of cell death.
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DOI：
10.1073/pnas.80.20.6361
被引量：
年份：
1983
BMJ
Semantic Scholar
掌桥科研
万方医学
dx.doi.org
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