TAp63 prevents premature aging by promoting adult stem cell maintenance.

TAp63 prevents premature aging by promoting adult stem cell maintenance.
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DOI:
10.1016/j.stem.2009.04.003
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发表时间:
2009-07-02
期刊:
影响因子:
23.9
通讯作者:
Flores ER
Flores ER
中科院分区:
医学1区
文献类型:
--
作者:
Su X;Paris M;Gi YJ;Tsai KY;Cho MS;Lin YL;Biernaskie JA;Sinha S;Prives C;Pevny LH;Miller FD;Flores ER

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调节成体组织干细胞维持的细胞机制在很大程度上仍然是未知的。我们在这里表明,p53家族成员,TAp 63,是必不可少的表皮和真皮前体的维护,在它的情况下,这些前体衰老和皮肤老化过早。具体来说,我们已经开发了TAp 63条件性敲除小鼠,并使用它来消除生殖系(TAp 63-/-)或表皮基底层中表达K14的细胞(TAp 63 fl/fl; K14 cre+)中的TAp 63。TAp 63 −/−小鼠过早衰老,出现水疱、皮肤溃疡、毛囊相关真皮和表皮细胞衰老以及毛发形态发生减少。这些表型可能是由于真皮和表皮前体中TAp 63的丢失,因为这两种细胞类型都显示出增殖缺陷、早期衰老和基因组不稳定性。这些数据表明,TAp 63通过调节细胞衰老和基因组稳定性来维持成体皮肤干细胞,从而防止组织过早老化。
The cellular mechanisms that regulate the maintenance of adult tissue stem cells are still largely unknown. We show here that the p53 family member, TAp63, is essential for maintenance of epidermal and dermal precursors and that, in its absence, these precursors senesce and skin ages prematurely. Specifically, we have developed a TAp63 conditional knockout mouse and used it to ablate TAp63 in the germline (TAp63−/−) or in K14-expressing cells in the basal layer of the epidermis (TAp63fl/fl;K14cre+). TAp63−/− mice age prematurely and develop blisters, skin ulcerations, senescence of hair follicle-associated dermal and epidermal cells, and decreased hair morphogenesis. These phenotypes are likely due to loss of TAp63 in dermal and epidermal precursors since both cell types show defective proliferation, early senescence, and genomic instability. These data indicate that TAp63 serves to maintain adult skin stem cells by regulating cellular senescence and genomic stability, thereby preventing premature tissue aging.
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