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Accelerated ageing in mice deficient in Zmpste24 protease is linked to p53 signalling activation

机译:缺乏Zmpste24蛋白酶的小鼠中加速衰老与p53信号激活有关

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Zmpste24 ( also called FACE- 1) is a metalloproteinase involved in the maturation of lamin A ( Lmna), an essential component of the nuclear envelope(1 - 3). Both Zmpste24- and Lmna- deficient mice exhibit profound nuclear architecture abnormalities and multiple histopathological defects that phenocopy an accelerated ageing process(1,2,4,5). Similarly, diverse human progeroid syndromes are caused by mutations in ZMPSTE24 or LMNA genes(6 - 10). To elucidate the molecular mechanisms underlying these devastating diseases, we have analysed the transcriptional alterations occurring in tissues from Zmpste24- deficient mice. We demonstrate that Zmpste24 deficiency elicits a stress signalling pathway that is evidenced by a marked upregulation of p53 target genes, and accompanied by a senescence phenotype at the cellular level and accelerated ageing at the organismal level. These phenotypes are largely rescued in Zmpste24 (-/-) Lmna (+/-) mice and partially reversed in Zmpste24 (-/-) p53 (-/-) mice. These findings provide evidence for the existence of a checkpoint response activated by the nuclear abnormalities caused by prelamin A accumulation, and support the concept that hyperactivation of the tumour suppressor p53 may cause accelerated ageing(11).
机译:Zmpste24(也称为FACE-1)是一种金属蛋白酶,涉及核纤层蛋白A(Lmna)的成熟,后者是核被膜的重要组成部分(1-3)。 Zmpste24和Lmna缺陷型小鼠均表现出深刻的核结构异常和多种组织病理学缺陷,这些缺陷表型加速了衰老过程(1,2,4,5)。类似地,ZMPSTE24或LMNA基因的突变也会导致多种人类早衰综合症(6-10)。为了阐明这些破坏性疾病的分子机制,我们分析了Zmpste24缺陷小鼠组织中发生的转录改变。我们证明,Zmpste24缺乏症会引起应激信号通路,这可以通过p53靶基因的明显上调来证明,并伴随着细胞水平的衰老表型和机体水平的加速衰老。这些表型在Zmpste24(-/-)Lmna(+/-)小鼠中很大程度上得到挽救,在Zmpste24(-/-)p53(-/-)小鼠中部分逆转。这些发现为由prelamin A积累引起的核异常激活的检查点反应的存在提供了证据,并支持肿瘤抑制因子p53过度激活可能导致衰老加速的观点(11)。

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