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During amphibian metamorphosis which is triggered by thyroid hormone (TH), the small intestine is extensively remodeled from the larval to adult form. In the Xenopus laevis intestine, some of the larval epithelial cells dedifferentiate into adult stem cells, which newly form the adult epithelium similar to the mammalian one. We have previously shown that TH-activated Shh, Wnt and Notch signaling pathways play important roles in adult epithelial development. Here we focus on the Hippo signaling pathway, which is known to interact with these pathways in the mammalian intestine. Our quantitative RT-PCR analysis indicates that the expression of genes involved in this pathway including YAP1, TAZ, TEAD1 and core kinases is differently regulated by TH in the metamorphosing intestine. Additionally, we show by in situ hybridization and immunohistochemistry that the transcriptional co-activator YAP1, a major effector of the Hippo signaling, is expressed in the adult stem cells and connective tissue cells surrounding them and that YAP1 protein is localized in either nucleus or cytoplasm of the stem cells. We further show that YAP1 binds its binding partner TEAD1 (transcription factor) in vivo and that their interaction is inhibited by verteporfin (VP). More importantly, by using VP in organ culture of the tadpoleintestine, we experimentally demonstrate that the inhibition of YAP1-TEAD1 interaction decreases both TH-induced stem cells expressing LGR5 and nearby connective tissue cells in number and proliferation, leading to the failure of adult epithelial development. Our results indicate that YAP-TEAD complex is required for stem cell development during intestinal remodeling.
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