Regulation of Bcl-xL expression in human keratinocytes by cell-substratum adhesion and the epidermal growth factor receptor.

Regulation of Bcl-xL expression in human keratinocytes by cell-substratum adhesion and the epidermal growth factor receptor.
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通过细胞-基质粘附和表皮生长因子受体调节人角质形成细胞中的 Bcl-xL 表达。

DOI:
10.1073/pnas.94.10.5067
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发表时间:
1997
影响因子:
11.1
通讯作者:
Ewert,DL
Ewert,DL
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Rodeck,U;Jost,M;DuHadaway,J;Kari,C;Jensen,PJ;Risse,B;Ewert,DL

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细胞-基质粘附是人类新生儿角质形成细胞在体外存活的基本要求。同样,表皮生长因子受体(EGF-R)的激活最近不仅与细胞周期进展有关,而且与正常角质形成细胞的存活有关。细胞-基质粘附或 EGF-R 激活保护角质形成细胞免遭程序性细胞死亡的机制尚不清楚。在这里,我们描述了 EGF-R 的阻断和基质粘附的抑制有一个共同的下游事件,即细胞死亡保护剂 Bcl-xL 的下调。在角质形成细胞强制悬浮培养过程中,Bcl-xL蛋白的表达下调,同时发生大规模细胞凋亡。类似地,EGF-R 阻断伴随着 Bcl-xL 稳态 mRNA 和蛋白质水平的下调,其程度与强制悬浮培养中观察到的水平相当。然而,EGF-R 阻断导致的 Bcl-xL 表达下调并不伴随细胞凋亡;在这种情况下,需要通过传代产生的第二个信号来诱导快速和大规模的细胞凋亡。这些发现与以下结论一致:(i) Bcl-xL 代表通过细胞基质粘附受体和 EGF-R 进行信号传导的共同分子靶点,以及 (ii) 通过 EGF-R 阻断降低 Bcl-xL 表达水平,降低角质形成细胞对细胞应激产生的细胞死亡信号的耐受性。
Cell–substratum adhesion is an essential requirement for survival of human neonatal keratinocytesin vitro. Similarly, activation of the epidermal growth factor receptor (EGF-R) has recently been implicated not only in cell cycle progression but also in survival of normal keratinocytes. The mechanisms by which either cell–substratum adhesion or EGF-R activation protect keratinocytes from programmed cell death are poorly understood. Here we describe that blockade of the EGF-R and inhibition of substratum adhesion share a common downstream event, the down-regulation of the cell death protector Bcl-xL. Expression of Bcl-xLprotein was down-regulated during forced suspension culture of keratinocytes, concurrent with large-scale apoptosis. Similarly, EGF-R blockade was accompanied by down-regulation of Bcl-xLsteady-state mRNA and protein levels to an extent comparable to that observed in forced suspension culture. However, down-regulation of Bcl-xLexpression by EGF-R blockade was not accompanied by apoptosis; in this case, a second signal, generated by passaging, was required to induce rapid and large-scale apoptosis. These findings are consistent with the conclusions that (i) Bcl-xLrepresents a shared molecular target for signaling through cell-substrate adhesion receptors and the EGF-R, and (ii) reduced levels of Bcl-xLexpression through EGF-R blockade lower the tolerance of keratinocytes for cell death signals generated by cellular stress.
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