PAC1酸酶是p53的转录标,用于信号亡和增长抑制
Yuxin Yin1, Yu-Xin Liu, Yan J Jin
1Department of Radiation Oncology, College of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, New York 10032, USA.
Nature
|April 4, 2003
概括
在亡过程中,瘤抑制剂p53激活了酸酶PAC1 (双特异性酸酶2). PAC1对于p53介导的亡和瘤抑制至关重要,揭示了一种新的基因调节机制.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 癌症研究 癌症研究
背景情况:
- 瘤抑制蛋白p53通过对目标基因的转录控制来调节细胞过程.
- PAC1 (激活细胞的酸酶1),也称为DUSP2,是一种双酸酶,不激活MAP激酶.
研究的目的:
- 研究p53在调节PAC1转录中的作用.
- 阐明涉及PAC1的p53-介导亡的机制.
- 探索PAC1在瘤抑制中的功能.
主要方法:
- 分析PAC1促进剂活性和p53结合的分析.
- 使用小干扰RNA (siRNA) 来降低PAC1的表达.
- 对PAC1过度表达的研究.
- 对MAP激酶活性的测量.
主要成果:
- p53通过结合其促进体中的一个palindromic位点直接激活PAC1转录.
- 通过p53诱导PAC1发生在血清剥夺和氧化应激下,导致亡.
- 通过siRNA介导的PAC1减少抑制了p53诱导的亡,而PAC1过度表达增强了亡并抑制了瘤的形成.
- 激活p53会抑制MAP激酶的活性,而PAC1对于这一过程是必要和充分的.
结论:
- 在特定的压力条件下,p53通过一个新的结合部位调节PAC1转录.
- PAC1是p53-依赖性亡和瘤抑制的关键媒介.
- 鉴定了palindromic p53结合位点,可以了解p53的基因调节机制.
关键词:
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