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Cell reports:转录激活因子抑制基因表达——一切皆有可能

2015-04-10 佚名 生物谷

近日,来自韩国的科学家在国际学术期刊cell reports在线发表了他们的最新研究进展,他们发现Hippo肿瘤抑制途径下游一直作为转录共激活因子的YAP和YAZ,也能够通过与具有TEA结构域的转录因子相互作用发挥转录共抑制因子活性,促进肿瘤进展。   YAP和TAZ是位于Hippo肿瘤抑制途径下游的具有癌基因功能的转录共激活因子,在正常的上皮细胞中过表达YAP/TAZ能够诱导细胞发

近日,来自韩国的科学家在国际学术期刊cell reports在线发表了他们的最新研究进展,他们发现Hippo肿瘤抑制途径下游一直作为转录共激活因子的YAP和YAZ,也能够通过与具有TEA结构域的转录因子相互作用发挥转录共抑制因子活性,促进肿瘤进展。
 
YAP和TAZ是位于Hippo肿瘤抑制途径下游的具有癌基因功能的转录共激活因子,在正常的上皮细胞中过表达YAP/TAZ能够诱导细胞发生转化,产生肿瘤干细胞特征。同时YAP/TAZ过表达能够促进组织内干细胞或祖细胞的高度增殖,导致多个上皮组织内癌症的发生。由于YAP/TAZ对于肿瘤发生非常重要,许多研究都致力于寻找能够被YAP/TAZ上调的基因,但是YAP和TAZ是否具有转录共抑制因子活性一直未有研究。
 
在这项研究中,研究人员证明YAP/TAZ能够作为转录共抑制因子抑制许多基因的表达,其中包括具有肿瘤抑制功能的基因如DDIT4(DNA damage-inducible transcript4)和Trail(TNF-related apoptosis-inducing ligand)。从机制上来讲,YAP/TAZ的转录抑制因子功能需要具有TEA结构域的转录因子的共同作用。YAP/TAZ-TEAD复合物能够招募NuRD复合物对组蛋白进行去乙酰化,改变目标基因位置的核小体结构。从功能上来讲,通过YAP/TAZ对DDIT4和Trail进行抑制对于mTOC1的激活和细胞存活都是非常必要的。
 
这项研究表明YAP/TAZ除了具有转录共激活因子活性,也可作为转录共抑制因子发挥作用,为进一步理解Hippo途径开辟了一条新的道路。

原始出处:

Minchul Kim1, Taekhoon Kim, Randy L. Johnson, Dae-Sik Lim.Transcriptional Co-repressor Function of the Hippo Pathway Transducers YAP and TAZ.Cell Reports, April 2, 2015.doi:10.1016/j.celrep.2015.03.015

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    2015-09-30 维他命
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    2015-04-11 mjldent
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