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• W2000431586 abstract "Proliferation and apoptosis are diametrically opposite processes. Expression of certain genes like c-Myc, however, can induce both, pointing to a possible linkage between them. Developing CD4(+)CD8(+) thymocytes are intrinsically sensitive to apoptosis, but the molecular basis is not known. We have found that these noncycling cells surprisingly express many cell cycle proteins. We generated transgenic mice expressing a CDK2 kinase-dead (CDK2-DN) protein in the T cell compartment. Analysis of these mice showed that the CDK2-DN protein acts as a dominant negative mutant in mature T cells as expected, but surprisingly, it acts as a dominant active protein in CD4(+)CD8(+) thymocytes. The levels of CDK2 kinase activity, cyclin E, cyclin A, and other cell cycle proteins in transgenic CD4(+)CD8(+) thymocytes are increased. Concurrently, caspase levels are elevated, and apoptosis is significantly enhanced in vitro and in vivo. E2F-1, the unique E2F member capable of inducing apoptosis when overexpressed, is specifically up-regulated in transgenic CD4(+)CD8(+) thymocytes but not in other T cell populations. These results demonstrate that the cell cycle and apoptotic machineries are normally linked, and expression of cell cycle proteins in developing T cells contributes to their inherent 1sensitivity to apoptosis." @default.
• W2000431586 created "2016-06-24" @default.
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• W2000431586 date "2010-03-01" @default.
• W2000431586 modified "2023-09-27" @default.
• W2000431586 title "Coupling of the Cell Cycle and Apoptotic Machineries in Developing T Cells" @default.
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• W2000431586 doi "https://doi.org/10.1074/jbc.m109.035535" @default.
• W2000431586 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2844203" @default.
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