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細(xì)胞衰老有什么特征呢?

時間:2023/10/12閱讀:168
分享:

細(xì)胞衰老最基本的特征之一,就是細(xì)胞長久地處于細(xì)胞周期的阻滯現(xiàn)象或者退出細(xì)胞周期。主要發(fā)生在細(xì)胞周期的G1期,區(qū)別于G0期停滯的靜止細(xì)胞。那細(xì)胞衰老有什么特征呢?一起來學(xué)習(xí)一下吧!

在pH為6時,衰老細(xì)胞具有較高的衰老相關(guān)-β-半乳糖苷酶(SA-β-gall)活性。

在衰老細(xì)胞中,細(xì)胞周期阻滯與細(xì)胞周期抑制劑水平的增強(qiáng)相關(guān),包括p16INK4a、p21CIP1和p27。

此外,在衰老細(xì)胞中可以觀察到p19ARF、p53和PAI-1的表達(dá)升高,并被用作各種衰老的生物標(biāo)志物。

此外,與增殖細(xì)胞相比,衰老細(xì)胞的通常特征是細(xì)胞大小的改變,形狀更光滑,并表現(xiàn)出與衰老相關(guān)的異染色質(zhì)灶的形成,脂褐素的積累,DNA損傷灶,層膜蛋白B1缺失,與衰老相關(guān)的衛(wèi)星膨脹,胚胎-軟骨細(xì)胞表達(dá)基因1(DEC1)和誘餌死亡受體2(DCR2)的表達(dá),一些microRNAs(miRNAs)的上調(diào)和大量因子的分泌,包括生長因子、細(xì)胞因子、趨化因子和蛋白酶【被稱為衰老相關(guān)分泌表型(SASP)】

上述所有特征都定義了識別衰老細(xì)胞的金標(biāo)準(zhǔn)標(biāo)記物,并代表了衰老的實(shí)際標(biāo)志。如果你有更多有關(guān)于細(xì)胞衰老有什么特征的問題,請給百奧創(chuàng)新留言哦!


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