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PBRM1 肿瘤抑制基因失活可扩增 VHL-/- 透明细胞肾细胞癌中的 HIF 反应。

Inactivation of the PBRM1 tumor suppressor gene amplifies the HIF-response in VHL-/- clear cell renal carcinoma.

机构信息

Department of Medical Oncology, Dana-Farber Cancer Institute and Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.

Center for Functional Cancer Epigenetics, Dana-Farber Cancer Institute, Boston, MA 02215.

出版信息

Proc Natl Acad Sci U S A. 2017 Jan 31;114(5):1027-1032. doi: 10.1073/pnas.1619726114. Epub 2017 Jan 12.

Abstract

Most clear cell renal carcinomas (ccRCCs) are initiated by somatic inactivation of the VHL tumor suppressor gene. The VHL gene product, pVHL, is the substrate recognition unit of an ubiquitin ligase that targets the HIF transcription factor for proteasomal degradation; inappropriate expression of HIF target genes drives renal carcinogenesis. Loss of pVHL is not sufficient, however, to cause ccRCC. Additional cooperating genetic events, including intragenic mutations and copy number alterations, are required. Common examples of the former are loss-of-function mutations of the PBRM1 and BAP1 tumor suppressor genes, which occur in a mutually exclusive manner in ccRCC and define biologically distinct subsets of ccRCC. PBRM1 encodes the Polybromo- and BRG1-associated factors-containing complex (PBAF) chromatin remodeling complex component BRG1-associated factor 180 (BAF180). Here we identified ccRCC lines whose ability to proliferate in vitro and in vivo is sensitive to wild-type BAF180, but not a tumor-associated BAF180 mutant. Biochemical and functional studies linked growth suppression by BAF180 to its ability to form a canonical PBAF complex containing BRG1 that dampens the HIF transcriptional signature.

摘要

大多数透明细胞肾细胞癌 (ccRCC) 是由 VHL 肿瘤抑制基因的体细胞失活引起的。VHL 基因产物 pVHL 是一种泛素连接酶的底物识别单元,该酶将 HIF 转录因子作为靶标进行蛋白酶体降解;HIF 靶基因的异常表达驱动肾细胞癌的发生。然而,pVHL 的缺失不足以导致 ccRCC。还需要其他协同的遗传事件,包括基因内突变和拷贝数改变。前者的常见例子是抑癌基因 PBRM1 和 BAP1 的功能丧失性突变,它们在 ccRCC 中以相互排斥的方式发生,定义了 ccRCC 的生物学上不同的亚群。PBRM1 编码多溴和 BRG1 相关因子包含复合物(PBAF)染色质重塑复合物成分 BRG1 相关因子 180 (BAF180)。在这里,我们鉴定了一些 ccRCC 细胞系,其在体外和体内增殖的能力对野生型 BAF180 敏感,但对肿瘤相关的 BAF180 突变体不敏感。生化和功能研究将 BAF180 的生长抑制作用与其形成包含 BRG1 的典型 PBAF 复合物的能力联系起来,该复合物可抑制 HIF 转录特征。

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