TGFbeta induces SIK to negatively regulate type I receptor kinase signaling.

TGFbeta induces SIK to negatively regulate type I receptor kinase signaling.
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TGFBETA诱导SIK对I型受体激酶信号传导进行负面调节。

DOI:
10.1083/jcb.200804107
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发表时间:
2008-08-25
影响因子:
7.8
通讯作者:
Moustakas, Aristidis
Moustakas, Aristidis
中科院分区:
生物学1区
文献类型:
--
作者:
Kowanetz, Marcin;Loenn, Peter;Vanlandewijck, Michael;Kowanetz, Katarzyna;Heldin, Carl-Henrik;Moustakas, Aristidis

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转化生长因子β(转化生长因子β)的信号转导调节不同细胞类型的生理反应。转化生长因子β通过I型和II型受体丝氨酸/苏氨酸激酶和细胞内调节转录的Smad蛋白来传递信号。转化生长因子β信号的强度和持续时间在很大程度上取决于信号传递过程中启动的负反馈程序。我们已经确定了转化生长因子β/Smad7信号转导的一个可诱导的基因靶点,即盐诱导激酶(SIK),它与Smad7一起负调控信号转导。SIK和Smad7形成一个复合体,共同下调激活的I型受体Alk5。我们进一步表明,SIK的激酶和泛素相关结构域都是正确降解Alk5所必需的,泛素的功能是促进SIK介导的受体降解。内源性SIK的缺失导致转化生长因子β的纤维化和细胞抑制程序的基因反应增强。因此,我们在SIK中发现了一个负调控因子,它控制转化生长因子β受体的周转和生理信号。
Signal transduction by transforming growth factor β (TGFβ) coordinates physiological responses in diverse cell types. TGFβ signals via type I and type II receptor serine/threonine kinases and intracellular Smad proteins that regulate transcription. Strength and duration of TGFβ signaling is largely dependent on a negative-feedback program initiated during signal progression. We have identified an inducible gene target of TGFβ/Smad signaling, the salt-inducible kinase (SIK), which negatively regulates signaling together with Smad7. SIK and Smad7 form a complex and cooperate to down-regulate the activated type I receptor ALK5. We further show that both the kinase and ubiquitin-associated domain of SIK are required for proper ALK5 degradation, with ubiquitin functioning to enhance SIK-mediated receptor degradation. Loss of endogenous SIK results in enhanced gene responses of the fibrotic and cytostatic programs of TGFβ. We thus identify in SIK a negative regulator that controls TGFβ receptor turnover and physiological signaling.
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