1. RAB11A-mediated YAP localization to adherens and tight junctions is essential for colonic epithelial integrity
- Author
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Shail Avasthi, James R. Goldenring, Edward M. Bonder, Shiyan Yu, Sheila Bandyopadhyay, Iyshwarya Balasubramanian, Radha Patel, Nan Gao, Sayantani Goswami, and Luca D’Agostino
- Subjects
0301 basic medicine ,colitis ,HEK293, human embryonic kidney 293 ,Cell Cycle Proteins ,Biochemistry ,Epithelium ,IEC, intestinal epithelial cell ,Mice ,Hippo ,beta Catenin ,Neurofibromin 2 ,DMEM, Dulbecco's modified Eagle's medium ,Tight junction ,Chemistry ,Dextran Sulfate ,Adherens Junctions ,Intestinal epithelium ,Cell biology ,endosomes ,YAP ,Signal transduction ,Research Article ,Endosome ,Colon ,MST1/2, mammalian sterile 20–like kinase-1/2 ,epithelial junction ,Tight Junctions ,Adherens junction ,03 medical and health sciences ,DSS, dextran sulfate sodium ,Animals ,Humans ,Molecular Biology ,Cell Proliferation ,RAB11A ,KD, knockdown ,Merlin ,LATS1/2, large tumor suppressor 1/2 ,030102 biochemistry & molecular biology ,HEK 293 cells ,Cell Biology ,YAP, Yes-associated protein ,Merlin (protein) ,Disease Models, Animal ,030104 developmental biology ,rab GTP-Binding Proteins ,Caco-2 Cells ,alpha Catenin ,colonic regeneration ,Transcription Factors ,HA, hemagglutinin - Abstract
Within the intestinal epithelium, regulation of intracellular protein and vesicular trafficking is of utmost importance for barrier maintenance, immune responses, and tissue polarity. RAB11A is a small GTPase that mediates the anterograde transport of protein cargos to the plasma membrane. Loss of RAB11A-dependent trafficking in mature intestinal epithelial cells results in increased epithelial proliferation and nuclear accumulation of Yes-associated protein (YAP), a key Hippo-signaling transducer that senses cell–cell contacts and regulates tissue growth. However, it is unclear how RAB11A regulates YAP intracellular localizations. In this report, we examined the relationship of RAB11A to epithelial junctional complexes, YAP, and the associated consequences on colonic epithelial tissue repair. We found that RAB11A controls the biochemical associations of YAP with multiple components of adherens and tight junctions, including α-catenin, β-catenin, and Merlin, a tumor suppressor. In the absence of RAB11A and Merlin, we observed enhanced YAP–β-catenin complex formation and nuclear translocation. Upon chemical injury to the intestine, mice deficient in RAB11A were found to have reduced epithelial integrity, decreased YAP localization to adherens and tight junctions, and increased nuclear YAP accumulation in the colon epithelium. Thus, RAB11A-regulated trafficking regulates the Hippo–YAP signaling pathway for rapid reparative response after tissue injury.
- Published
- 2021