Tumor suppression in the absence of p53-mediated cell-cycle arrest, apoptosis, and senescence.

Tumor suppression in the absence of p53-mediated cell-cycle arrest, apoptosis, and senescence.
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DOI:
10.1016/j.cell.2012.04.026
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发表时间:
2012-06-08
期刊:
影响因子:
64.5
通讯作者:
Gu W
Gu W
中科院分区:
生物学1区
文献类型:
--
作者:
Li T;Kon N;Jiang L;Tan M;Ludwig T;Zhao Y;Baer R;Gu W

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Cell-cycle arrest, apoptosis, and senescence are widely accepted as major mechanisms by which p53 inhibits tumor formation. Nevertheless, it remains unclear whether they are rate-limiting steps in tumor suppression. Here, we have generated mice bearing lysine to arginine mutations at one (p53K117R) or three (p533KR; K117R+K161R+K162R) of the critical p53 acetylation sites. While p53K117R/K117R cells are competent for p53-mediated cell-cycle arrest and senescence, but not apoptosis, all three of these processes are ablated in p533KR/3KR cells. Surprisingly, unlike p53-null mice, which rapidly succumb to spontaneous thymic lymphomas, early-onset tumor formation does not occur in either p53K117R/K117R or p533KR/3KR animals. Notably, p533KR retains the ability to modulate energy metabolism and reactive oxygen species (ROS) production by regulating metabolic p53 target genes. These findings underscore the crucial role of acetylation in differentially modulating p53 responses and suggest that unconventional activities of p53, such as metabolic regulation and antioxidant function, are critical for suppression of early-onset spontaneous tumorigenesis.
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