AMOT家族蛋白在Hippo信號通路中的功能和分子機制研究
[Abstract]:Relatively stable organ size is a basic feature of multicellular organisms. In recent years, it has been found that Hippo signaling pathway is a key pathway to control organ size. The Hippo pathway is transcripted downstream by phosphorylation of the core protein kinase chain composed of mammalianSTE20-like kinases 1 / 2 (MST1/2) -salvador1 (SAV1) complex and large tumor suppressor kinase 1 / 2 (LATS1/2) -MOB kinase activator 1A/B (MOB1A/B) complex. The active factor Yes-associated protein (YAP) / transcriptional coactivator with a PDZ-binding domain (TAZ), also promotes the retention and degradation of YAP/TAZ cytoplasm to function. But little is known about whether the downstream Hippo signaling pathway is independent of YAP/TAZ. We found that angiomotin (AMOT) family protein is a novel substrate of LATS1/2 kinase in Hippo pathway. LATS 1 / 2 responds to upstream G protein coupled receptor (GPCR) signal regulation and phosphorylated AMOT protein one of the shearing bodies of AMOTp130 conserved the HXRXXS motif. Phosphorylation inhibited the binding between AMOTp130 and microfilament, and the formation of microfilament and adhesion plaque. We also found that LATS1/2 phosphorylation of AMOTp130 inhibited the migration of vascular endothelial cells in vitro and the angiogenesis of zebrafish embryos in vivo. These results suggest that AMOTp130 is a direct substrate of LATS1/2 and mediates the important function of Hippo signaling pathway in endothelial cell migration and angiogenesis. On the other hand, AMOT family proteins, as members of Hippo pathway, play an important role in regulating the activity of Hippo pathway. Yap, as the most important effector protein in Hippo signaling pathway, can promote cell proliferation and inhibit cell apoptosis. However, the imbalance of YAP activity can lead to tumor formation, so the intensity and duration of YAP activation need to be accurately regulated. We found that AMOT family proteins angiomotin-like 2 (AMOTL2) and LATS2 play an important role in the negative feedback regulation induced by YAP activation. This is mainly through the direct binding of YAP to the promoter of LATS2 and AMOTL2 gene, which promotes the transcription of LATS2 and AMOTL2, and indirectly increases the expression of neurofibromin2 (NF2) protein to realize the negative feedback regulation caused by activation of neurofibromin2 (NF2) in serum. In the process of inducing tumor formation, YAP also initiated negative feedback regulation. YAP precisely regulates its activity by activating negative feedback mechanism. This is critical to the homeostasis of the body and its maladjustment leading to disease. These studies suggest that AMOT family proteins are involved in Hippo signaling pathway at multiple levels. On the one hand, AMOTp130 acts as a new substrate of LATS1/2 kinase in Hippo pathway, mediating the function of Hippo pathway in regulating angiogenesis; on the other hand, AMOTL2, as a target gene of YAP, inhibits the activity of YAP through negative feedback and maintains the homeostasis of Hippo pathway in vivo. In this paper, we first reported the regulation of Hippo pathway on angiogenesis under physiological conditions, and found the mechanism of maintaining the steady-state of Hippo pathway.
【學(xué)位授予單位】:浙江大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:Q25
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