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首页> 外文期刊>Cell cycle >Laminin regulates PI3K basal localization and activation to sustain STAT5 activation.
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Laminin regulates PI3K basal localization and activation to sustain STAT5 activation.

机译:层粘连蛋白调节PI3K的基础定位和激活,以维持STAT5激活。

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摘要

Extracellular matrix (ECM) is a key regulator of tissue morphogenesis and functional differentiation in the mammary gland. We showed recently that laminin-111 (LN1) together with prolactin induces beta-casein expression in mammary epithelial cells (MECs) by sustaining STAT5 activation. Others have shown that Rac1 is required for integrin-mediated STAT5 activation, but molecules upstream of Rac1 remain to be elucidated. Here, we show that exposure to three-dimensional (3D) laminin-rich ECM (LrECM) gels changes the localization of phosphoinositide 3-kinase (PI3K) in MECs from diffuse to basal accompanied with the activation of PI3K-Rac1 signaling pathway. We show by co-immunoprecipitation that Rac1 associates with STAT5, and that LrECM treatment enhances this interaction. Blocking PI3K with LY294002 inhibits LrECM-dependent Rac1 activation, attenuates sustained STAT5 phosphorylation and blocks beta-casein gene transcription. These results indicate that PI3K is a key mediator of the LN1-induced signaling cascade which controls the activity of transcription factors essential for tissue-specific gene expression.
机译:细胞外基质(ECM)是乳腺组织形态发生和功能分化的关键调节剂。我们最近显示,层粘连蛋白111(LN1)与催乳激素一起通过维持STAT5激活而诱导乳腺上皮细胞(MEC)中的β-酪蛋白表达。其他研究表明,Rac1是整合素介导的STAT5激活所必需的,但Rac1上游的分子仍有待阐明。在这里,我们表明,暴露于三维(3D)富含层粘连蛋白的ECM(LrECM)凝胶可改变MEC中磷酸肌醇3激酶(PI3K)的定位,从弥漫性到基础性伴随着PI3K-Rac1信号通路的激活。我们通过共免疫沉淀显示Rac1与STAT5相关,并且LrECM治疗增强了这种相互作用。用LY294002阻断PI3K可抑制LrECM依赖性Rac1活化,减弱持续的STAT5磷酸化并阻断β-酪蛋白基因转录。这些结果表明PI3K是LN1诱导的信号传导级联的关键介体,它控制组织特异性基因表达所必需的转录因子的活性。

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