title: An adhesion-independent, aPKC-dependent function for cadherins in morphogenetic movements.
abstract: Cadherin shedding affects migration and occurs in development and cancer progression. By examining the in vivo biological function of the extracellular cadherin domain (CEC1-5) independently of the shedding process itself, we identified a novel function for cadherins in convergent extension (CE) movements in Xenopus. CEC1-5 interfered with CE movements during gastrulation. Unexpectedly, CEC1-5 did not alter cell aggregation or adhesion to cadherin substrates. Instead, gastrulation defects were rescued by a membrane-anchored cadherin cytoplasmic domain, the polarity protein atypical PKC (aPKC) or constitutive active Rac, indicating that CEC1-5 modulates a cadherin-dependent signalling pathway. We found that the cadherin interacts with aPKC and, more importantly, that the extracellular domain alters this association as well as the phosphorylation status of aPKC. This suggests that CE movements require a dynamic regulation of cadherin-aPKC interaction. Our results show that cadherins play a dual role in CE movements: a previously identified adhesive activity and an adhesion-independent function that requires aPKC and Rac, thereby directly connecting cadherins with polarity. Our results also suggest that increased cadherin shedding, often observed in cancer progression, can regulate migration and invasion by modulating polarity protein activity.
authors: Center for Molecular Medicine Cologne, University of Cologne, 50923 Cologne, Germany.
authors: Karla
authors: K
authors: Seifert
authors: Hady
authors: H
authors: Ibrahim
authors: Torben
authors: T
authors: Stodtmeister
authors: Rudolf
authors: R
authors: Winklbauer
authors: Carien M
authors: CM
authors: Niessen
mesh_terms: D000818:Animals; D016466:CHO Cells; D015820:Cadherins / Q000235:genetics / Q000378:metabolism*; D002448:Cell Adhesion; D045744:Cell Line, Tumor; D002465:Cell Movement; D006224:Cricetinae; D003412:Cricetulus; D004285:Dogs; D054262:Gastrulation; D006801:Humans; D009024:Morphogenesis; D010766:Phosphorylation; D011493:Protein Kinase C / Q000235:genetics / Q000378:metabolism*; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015398:Signal Transduction; D046509:Tissue Culture Techniques; D014162:Transfection; D029867:Xenopus Proteins / Q000378:metabolism; D014982:Xenopus laevis / Q000196:embryology / Q000235:genetics / Q000378:metabolism*; D020744:rac GTP-Binding Proteins / Q000378:metabolism
chemical_list: C074260:CDH3 protein, Xenopus; D015820:Cadherins; D011993:Recombinant Fusion Proteins; D029867:Xenopus Proteins; C115015:PKC-3 protein; D011493:Protein Kinase C; D020744:rac GTP-Binding Proteins