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SWI/SNF复合体的核心成分SNF5在某种程度上通过Eif4e成为了p53表达和细胞存活的必要因素 |
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SNF5, a core component of the SWI/SNF complex, is necessary for p53 expression and cell survival, in part through Eif4e |
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Xu Y, Yan W, Chen X 2010/8/12 14:08:00 |
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Oncogene, 2010, Volume 29, Issue 28
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SNF5, a core component of the SWI/SNF chromatin remodeling complex, is expressed as two isoforms, SNF5a and SNF5b. SNF5 is a tumor suppressor, as mutation of SNF5 leads to tumor formation and cooperates with p53 deficiency to enhance cancer susceptibility. Interestingly, lack of SNF5 inhibits cell survival and embryonic development, potentially through abnormal activation of p53. To further examine this, we generated cell lines in which SNF5a, SNF5b or both can be inducibly knocked down. We found that SNF5 knockdown leads to cell-cycle arrest in G 1, and SNF5a and SNF5b are functionally redundant. We also showed that SNF5 knockdown impairs p53-dependent transcription of p21 and murine double minute 2. However, contrary to earlier reports that p53 is activated by SNF5 knockout in murine cells, SNF5 knockdown leads to decreased, but not increased, expression of both basal and stress-induced p53 in multiple human cell lines. In addition, we showed that SNF5 knockdown induces adenosine monophosphate-activated protein kinase activation and inhibits eIF4E expression. Finally, we showed that SNF5 knockdown inhibits p53 translation by eIF4E and replacement of eIF4E in SNF5 knockdown cells restores p53 expression and cell survival. Together, our study results suggest that the p53 pathway is regulated by, and mediates the activity of, SNF5 in tumor suppression and prosurvival. © 2010 Macmillan Publishers Limited. All rights reserved.
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Correspondence Address: Chen, X.; Center for Comparative Oncology, University of California at Davis, 2128 TupperHall, Davis, CA 95616, United States; email:xbchen@ucdavis.edu |
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疾病资源中心
王燕燕 王曙
上海交通大学附属瑞金医院内分泌科
患者,女,69岁。2009年1月无明显诱因下出现乏力,当时程度较轻,未予以重视。2009年3月患者乏力症状加重,尿色逐渐加深,大便习惯改变,颜色变淡。4月18日入我院感染科治疗,诉轻度头晕、心慌,体重减轻10kg。无肝区疼痛,无发热,无腹痛、腹泻、腹胀、里急后重,无恶性、呕吐等。入院半月前于外院就诊,查肝功能:ALT 601IU/L,AST 785IU/L,TBIL 97.7umol/L,白蛋白 41g/L,甲状腺功能:游离T3 30.6pmol/L,游离T4 51.9pmol/L,心电图示快速房颤。
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