Src-mediated caveolin-1 phosphorylation regulates intestinal epithelial restitution by altering Ca2+influx after wounding
Src-mediated caveolin-1 phosphorylation regulates intestinal epithelial restitution by altering Ca2+influx after wounding
Early mucosal restitution occurs as a consequence of intestinal epithelial cell (IEC) migration to reseal superficial wounds, but its exact mechanism remains largely unknown. Caveolin-1 (Cav1), a major component associated with caveolar lipid rafts in the plasma membrane, is implicated in many aspects of cellular functions. This study determined if c-Src kinase (Src)-induced Cav1 phosphorylation promotes intestinal epithelial restitution after wounding by activating Cav1-mediated Ca2+signaling. Src directly interacted with Cav1, formed Cav1-Src complexes, and phosphorylated Cav1 in IECs. Inhibition of Src activity by its chemical inhibitor PP2 or suppression of the functional caveolin scaffolding domain by caveolin-scaffolding domain peptides prevented Cav1-Src interaction, reduced Cav1 phosphorylation, decreased Ca2+influx, and inhibited cell migration after wounding. Disruption of caveolar lipid raft microdomains by methyl-β-cyclodextrin reduced Cav1-mediated Ca2+influx and repressed epithelial restitution. Moreover, Src silencing prevented subcellular redistribution of phosphorylated Cav1 in migrating IECs. These results indicate that Src-induced Cav1 phosphorylation stimulates epithelial restitution by increasing Cav1-mediated Ca2+signaling after wounding, thus contributing to the maintenance of gut mucosal integrity under various pathological conditions.
- University of Maryland School of Medicine United States
- Veterans Health Administration United States
- University of Maryland, Baltimore United States
CSK Tyrosine-Protein Kinase, Wound Healing, src-Family Kinases, Cell Movement, Caveolin 1, Humans, Calcium, Intestinal Mucosa, Cells, Cultured, Signal Transduction
CSK Tyrosine-Protein Kinase, Wound Healing, src-Family Kinases, Cell Movement, Caveolin 1, Humans, Calcium, Intestinal Mucosa, Cells, Cultured, Signal Transduction
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