Lats2 modulates adipocyte proliferation and differentiation via hippo signaling.

Lats2 modulates adipocyte proliferation and differentiation via hippo signaling.
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DOI:
10.1371/journal.pone.0072042
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Li N
Li N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
An Y;Kang Q;Zhao Y;Hu X;Li N

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Hippo通路首先在果蝇中发现,在哺乳动物中高度保守,它控制着器官的大小。Lats 2是Hippo通路的核心激酶之一,通过与下游转录辅因子雅普和TAZ相互作用在细胞增殖中起主要作用。虽然Hippo通路和Lats 2在几种组织和器官中的功能相对较好地理解,但关于Lats 2和Hippo信号传导在脂肪发育中的功能知之甚少。在这里,我们表明Lats 2是通过Hippo信号传导的脂肪细胞增殖和分化的重要调节剂。一旦激活,Lats 2磷酸化雅普和TAZ,导致它们保留在细胞质中,阻止它们激活细胞核中的转录因子TEAD。由于TAZ保留在细胞质中,因此PPARγ恢复了其转录活性。此外,细胞质TAZ通过抑制DVL 2而作为Wnt信号传导的抑制剂,从而阻止β-连环蛋白进入细胞核以刺激TCF/LEF转录活性。上述作用有助于脂肪细胞的抑制增殖和加速分化的表型。因此,Lats 2调节脂肪发育期间增殖和分化之间的平衡。有趣的是,我们的研究提供了证据表明Lats 2不仅负调节细胞增殖,而且正调节细胞分化。
First identified in Drosophila and highly conserved in mammals, the Hippo pathway controls organ size. Lats2 is one of the core kinases of the Hippo pathway and plays major roles in cell proliferation by interacting with the downstream transcriptional cofactors YAP and TAZ. Although the function of the Hippo pathway and Lats2 is relatively well understood in several tissues and organs, less is known about the function of Lats2 and Hippo signaling in adipose development. Here, we show that Lats2 is an important modulator of adipocyte proliferation and differentiation via Hippo signaling. Upon activation, Lats2 phosphorylates YAP and TAZ, leading to their retention in the cytoplasm, preventing them from activating the transcription factor TEAD in the nucleus. Because TAZ remains in the cytoplasm, PPARγ regains its transcriptional activity. Furthermore, cytoplasmic TAZ acts as an inhibitor of Wnt signaling by suppressing DVL2, thereby preventing β-catenin from entering the nucleus to stimulate TCF/LEF transcriptional activity. The above effects contribute to the phenotype of repressed proliferation and accelerated differentiation in adipocytes. Thus, Lats2 regulates the balance between proliferation and differentiation during adipose development. Interestingly, our study provides evidence that Lats2 not only negatively modulates cell proliferation but also positively regulates cell differentiation.
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