Cross-regulation of T cell growth factor expression by p53 and the tax oncogene

被引:18
作者
Chaudhry, S
Freebern, WJ
Smith, JL
Butscher, WG
Haggerty, CM
Gardner, K
机构
[1] NCI, Pathol Lab, Ctr Adv Technol, NIH, Bethesda, MD 20892 USA
[2] NCI, Lab Receptor Biol & Gene Express, Ctr Adv Technol, NIH, Bethesda, MD 20892 USA
[3] Howard Univ, Coll Med, Dept Microbiol, Washington, DC 20059 USA
关键词
D O I
10.4049/jimmunol.169.12.6767
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
In this study, we demonstrate that p53 directly inhibits expression of the T cell growth factor (IL-2) in activated T cells. This repression is independent of the intrinsic transcriptional activity of p53 and is mediated by the Tax-responsive CD28RE-3'-12-O-tetradecanoylphorbol-13-acetate response element (AP1) element of the IL-2 promoter. Coexpression of the Tax oncogene causes full reversal of this repression through coordinate targeting of p300, CREB, and the NF-kappaB pathways. Paradoxically, IL-2 repression by p53 is not reversed by mdm2. Instead, mdm2 represses the IL-2 promoter by a mechanism that is synergistic with p53 and resistant to Tax reversal. The p300 structure-function studies show that these effects are linked to competitive associations among p53, Tax, and mdm2 with multiple domains of p300. The functional outcome of these antagonistic associations is revealed further by the observation that Tax and p53 induce apoptosis in activated T cells through separate and mutually exclusive pathways. Interestingly, both pathways are abrogated by mdm2. These results provide evidence that a dynamic interplay, between Tax and specific elements of the p53 network, mediates growth factor expression and programmed cell death in activated T cells.
引用
收藏
页码:6767 / 6778
页数:12
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