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
中科院分区:
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
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.
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影响因子:
8.8
作者:
Hurt, E. M.;Kawasaki, B. T.;Klarmann, G. J.;Thomas, S. B.;Farrar, W. L.
通讯作者:
Farrar, W. L.
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Bourguignon, LYW;Zhu, HB;Hung, MC
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