Mechanical stretch induces clustering of beta1-integrins and facilitates adhesion

Experimental Dermatology
Yvonne KniesStefan Kippenberger

Abstract

Human epithelial cells are permanently stimulated by external mechanical forces. The present in vitro study suggests that keratinocytes respond to mechanical strain by a coordinated spatial and functional utilization of beta1-integrins and the epidermal growth factor receptor (EGFR) with impact to the adhesion properties. It was found that a single mechanical stretch applied to HaCaT keratinocytes elevates the substrate adhesion, in particular to fibronectin and collagen type IV but not to laminin indicating the relevance of beta1-integrins in this process. This was confirmed using a functional blocking antibody directed against beta1-integrins which reversed the stretch-induced adhesion. Furthermore, mechanical stretch gives rise to a rapid redistribution of beta1-integrins in clusters on the basal cell membrane, without changing the overall amount of this particular integrin subset. Concomitantly, the EGFR co-localizes with beta1-integrin suggesting a functional cooperation of both membrane proteins in mechano-signaling. This is corroborated by data showing that stretch-induced activation of the EGFR and the downstream element extracellular regulated kinase 1/2 (ERK1/2) is reversed by preincubation with beta1-integrin antibod...Continue Reading

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