Early aging-associated phenotypes in Bub3/Rae1 haploinsufficient mice.

Early aging-associated phenotypes in Bub3/Rae1 haploinsufficient mice.
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DOI:
10.1083/jcb.200507081
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发表时间:
2006-02-13
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
van Deursen JM
van Deursen JM
中科院分区:
其他
文献类型:
--
作者:
Baker DJ;Jeganathan KB;Malureanu L;Perez-Terzic C;Terzic A;van Deursen JM

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衰老是一个高度复杂的生物学过程,被认为涉及多种机制。有少量有丝分裂检查点蛋白BubR 1的小鼠比正常小鼠衰老得快得多,但其他有丝分裂检查点基因是否能防止衰老的早期发生尚不清楚。在这项研究中,我们发现,几种与衰老相关的表型在有丝分裂检查点基因Bub 3和Rae 1的双单倍不足的小鼠中早期出现,但在这些基因的单倍不足的小鼠中则没有。来自Bub 3/Rae 1单倍体不足小鼠的小鼠胚胎成纤维细胞(MEF)经历过早衰老并积累高水平的p19、p53、p21和p16,而来自单倍体不足小鼠的MEF则不会。此外,虽然BubR 1亚型小鼠比Bub 3/Rae 1单倍体不足小鼠具有更少的非整倍体,但它们衰老得更快。我们的研究结果表明,在有丝分裂检查点基因缺陷的小鼠中,衰老相关表型的早期发作与细胞衰老和p53和p16通路的激活有关,而不是与非整倍体有关。
Aging is a highly complex biological process that is believed to involve multiple mechanisms. Mice that have small amounts of the mitotic checkpoint protein BubR1 age much faster than normal mice, but whether other mitotic checkpoint genes function to prevent the early onset of aging is unknown. In this study, we show that several aging-associated phenotypes appear early in mice that are double haploinsufficient for the mitotic checkpoint genes Bub3 and Rae1 but not in mice that are single haploinsufficient for these genes. Mouse embryonic fibroblasts (MEFs) from Bub3/Rae1 haploinsufficient mice undergo premature senescence and accumulate high levels of p19, p53, p21, and p16, whereas MEFs from single haploinsufficient mice do not. Furthermore, although BubR1 hypomorphic mice have less aneuploidy than Bub3/Rae1 haploinsufficient mice, they age much faster. Our findings suggest that early onset of aging-associated phenotypes in mice with mitotic checkpoint gene defects is linked to cellular senescence and activation of the p53 and p16 pathways rather than to aneuploidy.
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