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Interferon- Inhibits T84 Epithelial Cell Migration by Redirecting Transcytosis of ₁ Integrin from the Migrating Leading Edge¹

Epithelial Pathology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, GA 30322

Intestinal inflammation is associated with epithelial damage and formation of mucosal wounds. Epithelial cells migration is required for wound closure. In inflammatory status, migrating epithelial cells are exposed to proinflammatory cytokines such as IFN-. However, influence of such cytokines on intestinal epithelial wound closure remains unknown. The present study was designed to investigate the effect of IFN- on migration of model T84 intestinal epithelial cells and recovery of epithelial wounds. IFN- significantly inhibited rate of T84 cell migration and closure of epithelial wounds. This effect was accompanied by the formation of large aberrant lamellipodia at the leading edge as well as significant decrease in the number of ₁ integrin containing focal adhesions. IFN- exposure increased endocytosis of ₁ integrin and shifted its accumulation from early/recycling endosomes at the leading edge to a yet unidentified compartment at the cell base. This redirection in ₁ integrin transcytosis was inhibited by depolymerization of microtubules with nocodazole and was unaffected by stabilization of microtubules with docetaxel. These results suggest that IFN- attenuates epithelial wound closure by microtubule-dependent redirection of ₁ integrin transcytosis from the leading edge of migrating cells thereby inhibiting adequate turnover of focal adhesion complexes and cell migration.

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