Growth-inhibitory and tumor- suppressive functions of p53 depend on its repression of CD44 expression.

Growth-inhibitory and tumor- suppressive functions of p53 depend on its repression of CD44 expression.
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DOI:
10.1016/j.cell.2008.06.006
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发表时间:
2008-07-11
期刊:
影响因子:
64.5
通讯作者:
Weinberg RA
Weinberg RA
中科院分区:
生物学1区
文献类型:
--
作者:
Godar S;Ince TA;Bell GW;Feldser D;Donaher JL;Bergh J;Liu A;Miu K;Watnick RS;Reinhardt F;McAllister SS;Jacks T;Weinberg RA

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p53 肿瘤抑制因子是细胞对各种应激反应的关键介质。在这里,我们表明,在基础生理和细胞培养应激条件下,p53 通过与 CD44 启动子中的非规范 p53 结合序列结合来抑制 CD44 细胞表面分子的表达。这种相互作用使未转化的细胞能够对应激诱导的、p53 依赖性细胞抑制和凋亡信号做出反应,否则这些信号将被 CD44 的作用所阻断。在缺乏 p53 功能的情况下,所产生的去抑制的 CD44 表达对于高致瘤性乳腺上皮细胞的生长和肿瘤启动能力至关重要。在致瘤和非致瘤细胞中,CD44 的表达均受到 p63(p53 的旁系同源物)的正向调节。我们的数据表明,CD44 是缺乏 p53 功能的转化肿瘤细胞中的关键促肿瘤剂。他们还表明,p53 失活导致的 CD44 去抑制可能有助于永生化、癌前细胞的存活。
The p53 tumor suppressor is a key mediator of cellular responses to various stresses. Here we show that under conditions of basal physiologic and cell-culture stress, p53 inhibits expression of the CD44 cell-surface molecule via binding to a non-canonical p53-binding sequence in the CD44 promoter. This interaction enables an untransformed cell to respond to stress-induced, p53-dependent cytostatic and apoptotic signals that would otherwise be blocked by the actions of CD44. In the absence of p53 function, the resulting de-repressed CD44 expression is essential for the growth and tumor-initiating ability of highly tumorigenic mammary epithelial cells. In both tumorigenic and non-tumorigenic cells, CD44’s expression is positively regulated by p63, a paralogue of p53. Our data indicate that CD44 is a key tumor-promoting agent in transformed tumor cells lacking p53 function. They also suggest that the de-repression of CD44 resulting from inactivation of p53 can potentially aid the survival of immortalized, premalignant, cells.
CD44+ CD24( - )前列腺细胞是早期的癌症祖/干细胞,为预后不良的患者提供了模型。
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