MicroRNA let-7 downregulates STAT3 phosphorylation in pancreatic cancer cells by increasing SOCS3 expression.

MicroRNA let-7 downregulates STAT3 phosphorylation in pancreatic cancer cells by increasing SOCS3 expression.
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DOI:
10.1016/j.canlet.2014.01.020
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发表时间:
2014-05-28
期刊:
影响因子:
9.7
通讯作者:
Ghosh, Sajal K.
Ghosh, Sajal K.
中科院分区:
医学1区
文献类型:
--
作者:
Patel, Kripa;Kollory, Anita;Takashima, Asami;Sarkar, Sibaji;Faller, Douglas V.;Ghosh, Sajal K.

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虽然STAT3信号对于正常的胰腺功能来说是必不可少的,但在胰腺癌中经常被激活。持续下调microRNA let-7的表达也是胰腺导管腺癌(PDAC)活检标本的特征。我们在这项研究中证明,在低分化的PDAC细胞系中,let-7的重新表达减少了STAT3及其下游信号转导事件的磷酸化/激活,并减少了PDAC细胞的生长和迁移。Let-7的重新表达不能抑制STAT3蛋白及其激活型细胞因子IL-6的表达。然而,let-7的重新表达增强了细胞因子信号转导抑制因子3(SOCS3)的胞浆表达,从而阻断了JAK2对STAT3的激活。因此,我们的研究确定了一种机制,通过改变let-7的表达来抑制胰腺癌细胞中的STAT3信号。
Although dispensable for normal pancreatic function, STAT3 signaling is frequently activated in pancreatic cancers. Consistent downregulation of expression of microRNA let-7 is also characteristic of pancreatic ductal adenocarcinoma (PDAC) biopsy specimens. We demonstrate in this study that re-expression of let-7 in poorly-differentiated PDAC cell lines reduced phosphorylation/activation of STAT3 and its downstream signaling events and reduced the growth and migration of PDAC cells. Let-7 re-expression did not repress expression of STAT3 protein or its activator cytokine interleukin 6 (IL-6). However, let-7 re-expression enhanced cytoplasmic expression of suppressor of cytokine signaling 3 (SOCS3), which blocks STAT3 activation by JAK2. Our study thus identified a mechanism by which STAT3 signaling can be inhibited in pancreatic cancer cells by modifying let-7 expression.
Let-7 microRNA家族的演变。
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