Acetylation and activation of STAT3 mediated by nuclear translocation of CD44.

Acetylation and activation of STAT3 mediated by nuclear translocation of CD44.
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DOI:
10.1083/jcb.200812060
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发表时间:
2009-06-15
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Chen JY
Chen JY
中科院分区:
其他
文献类型:
--
作者:
Lee JL;Wang MJ;Chen JY

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I型跨膜糖蛋白CD44的表达最近被认为是癌症干细胞的标志。在这项研究中,我们证明,CD44,一旦从事,内化和易位到细胞核,在那里它结合到各种启动子,包括细胞周期蛋白D1,导致细胞命运的改变,通过转录重编程。在调节细胞周期蛋白D1表达时,内化的CD44与STAT3和p300(乙酰转移酶)形成复合物,引发STAT3在赖氨酸685处乙酰化,并以细胞因子和生长因子非依赖性方式形成二聚体。一个二分核定位信号(NLS)被映射到CD44的胞质尾,介导其核转位。CD44(NLS)突变体螯合物STAT3在胞质溶胶中的表达。在细胞核中,乙酰化的STAT3二聚体仍然与CD44结合,并与细胞周期蛋白D1启动子结合,导致细胞周期蛋白D1表达增加和细胞增殖。本研究描述了一种新的功能,通过核转位的内化CD44和复合物的形成与转录因子的转录调节CD44。
Expression of the type I transmembrane glycoprotein CD44 has recently been recognized as a signature for cancer stem cells. In this study, we demonstrate that CD44, once engaged, is internalized and translocated to the nucleus, where it binds to various promoters, including that of cyclin D1, leading to cell fate change through transcriptional reprogramming. In regulating cyclin D1 expression, the internalized CD44 forms a complex with STAT3 and p300 (acetyltransferase), eliciting STAT3 acetylation at lysine 685 and dimer formation in a cytokine- and growth factor–independent manner. A bipartite nuclear localization signal (NLS) was mapped to the cytoplasmic tail of CD44, which mediates its nuclear translocation. Expression of CD44(NLS) mutant sequesters STAT3 in cytosol. In the nucleus, the acetylated STAT3 dimer remains associated with CD44 and binds to the cyclin D1 promoter, leading to increased cyclin D1 expression and cell proliferation. This study describes a novel function for CD44 in transcriptional modulation through nuclear translocation of the internalized CD44 and complex formation with transcription factors.
膜型1基质金属蛋白酶切割CD44并促进细胞迁移。
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