title: Coronin 1C negatively regulates cell-matrix adhesion and motility of intestinal epithelial cells.
abstract: Coronins, WD-repeat actin-binding proteins, are known to regulate cell motility by coordinating actin filament turnover in lamellipodia of migrating cell. Here we report a novel mechanism of Coronin 1C-mediated cell motility that involves regulation of cell-matrix adhesion. RNAi silencing of Coronin 1C in intestinal epithelial cells enhanced cell migration and modulated lamellipodia dynamics by increasing the persistence of lamellipodial protrusion. Coronin 1C-depleted cells showed increased cell-matrix adhesions and enhanced cell spreading compared to control cells, while over-expression of Coronin 1C antagonized cell adhesion and spreading. Enhanced cell-matrix adhesion of coronin-deficient cells correlated with hyperphosphorylation of focal adhesion kinase (FAK) and paxillin, and an increase in number of focal adhesions and their redistribution at the cell periphery. siRNA depletion of FAK in coronin-deficient cells rescued the effects of Coronin 1C depletion on motility, cell-matrix adhesion, and spreading. Thus, our findings provide the first evidence that Coronin 1C negatively regulates epithelial cell migration via FAK-mediated inhibition of cell-matrix adhesion.
authors.affiliation: Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA 30322, USA. ssamari@emory.edu
authors.forename: Stanislav N
authors.initials: SN
authors.lastname: Samarin
authors.forename: Stefan
authors.initials: S
authors.lastname: Koch
authors.forename: Andrei I
authors.initials: AI
authors.lastname: Ivanov
authors.forename: Charles A
authors.initials: CA
authors.lastname: Parkos
authors.forename: Asma
authors.initials: A
authors.lastname: Nusrat
mesh_terms: D002460:Cell Line; D002465:Cell Movement; D021982:Cell-Matrix Junctions / Q000378:metabolism / Q000502:physiology*; D004847:Epithelial Cells / Q000378:metabolism / Q000502:physiology; D051417:Focal Adhesion Kinase 1 / Q000378:metabolism*; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism / Q000502:physiology*; D008840:Microfilament Proteins / Q000235:genetics / Q000502:physiology*; D011554:Pseudopodia / Q000378:metabolism / Q000502:physiology; D034741:RNA, Small Interfering / Q000235:genetics
chemical_list: D008840:Microfilament Proteins; D034741:RNA, Small Interfering; C072061:coronin proteins; D051417:Focal Adhesion Kinase 1; C496050:PTK2 protein, human