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Fyn Regulates Adipogenesis by Promoting PIKE-A/STAT5a Interaction

机译:Fyn通过促进PIKE-A / STAT5a相互作用来调节脂肪形成。

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Fyn is a tyrosine kinase with multiple roles in a variety of cellular processes. Here we report that Fyn is a new kinase involved in adipocyte differentiation. Elevated Fyn protein is detected specifically in the adipocytes of obese mice. Moreover, Fyn expression increases progressively in 3T3-L1 cells during in vitro adipogenesis, which correlates with its kinase activity. Inhibition of Fyn by either genetic or pharmacological manipulation restrains the 3T3-L1 preadipocytes from fully differentiating into mature adipocytes. Mechanistically, Fyn regulates the activity of the adipogenic transcription factor signal transducer and activator of transcription 5a (STAT5a) through enhancing its interaction with the GTPase phosphoinositide 3-kinase enhancer A (PIKE-A). The STAT5a activity is therefore reduced in Fyn- or PIKE-ablated adipose tissues, leading to diminished expression of adipogenic markers and adipocyte differentiation. Our data thus demonstrate a novel functional interaction between Fyn, PIKE-A, and STAT5a in mediating adipogenesis.
机译:Fyn是一种酪氨酸激酶,在多种细胞过程中具有多种作用。在这里,我们报道Fyn是一种参与脂肪细胞分化的新激酶。在肥胖小鼠的脂肪细胞中特异性检测到升高的Fyn蛋白。此外,在体外成脂过程中3T3-L1细胞中Fyn的表达逐渐增加,这与其激酶活性有关。通过遗传或药理学方法抑制Fyn可以抑制3T3-L1前脂肪细胞完全分化为成熟脂肪细胞。在机制上,Fyn通过增强其与GTPase磷酸肌醇3激酶增强剂A(PIKE-A)的相互作用来调节成脂转录因子信号转导子和转录激活子5a(STAT5a)的活性。因此,在 Fyn -或 PIKE 消融的脂肪组织中STAT5a活性降低,导致脂肪生成标记物的表达减少和脂肪细胞分化。因此,我们的数据证明了Fyn,PIKE-A和STAT5a在介导脂肪形成中的新型功能相互作用。

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