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Journal Article
Research Support, Non-U.S. Gov't
p53 and p73 Regulate Apoptosis but Not Cell-Cycle Progression in Mouse Embryonic Stem Cells upon DNA Damage and Differentiation.
Stem Cell Reports 2016 December 14
Embryonic stem cells (ESCs) are fast proliferating cells capable of differentiating into all somatic cell types. In somatic cells, it is well documented that p53 is rapidly activated upon DNA damage to arrest the cell cycle and induce apoptosis. In mouse ESCs, p53 can also be functionally activated, but the precise biological consequences are not well characterized. Here, we demonstrated that doxorubicin treatment initially led to cell-cycle arrest at G2/M in ESCs, followed by the occurrence of massive apoptosis. Neither p53 nor its target gene p73 was required for G2/M arrest. Instead, p53 and p73 were fully responsible for apoptosis. p53 and p73 were also required for differentiation-induced apoptosis in mouse ESCs. In addition, doxorubicin treatment induced the expression of retinoblastoma protein in a p53-dependent manner. Therefore, both p53 and p73 are critical in apoptosis induced by DNA damage and differentiation.
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