An Arf6- and caveolae-dependent pathway links hemidesmosome remodeling and mechanoresponse
An Arf6- and caveolae-dependent pathway links hemidesmosome remodeling and mechanoresponse
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Arf6 和小凹依赖性通路将半桥粒重塑和机械反应联系起来
DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
M. Labouesse
中科院分区:
文献类型:
--
作者:
N. Osmani;Julien Pontabry;J. Comelles;Nina Fekonja;J. Goetz;D. Riveline;E. Georges‐Labouesse;M. Labouesse
Hemidesmosomes (HDs) are epithelial-specific cell-matrix adhesions, which stably anchor the intracellular keratin network to the extracellular matrix. Although their main role is to protect the epithelial sheet from external mechanical strain, how HDs respond to mechanical stress remains poorly understood. Here we identify a pathway essential for HD remodeling, and outline its role with respect to α6β4 integrin recycling. We find that α6β4 integrin chains localize to the plasma membrane/caveolae and Arf6+ endocytic compartments. Based on FRAP and endocytosis assays, integrin recycling between both sites requires the small GTPase Arf6 and its co-regulators GIT1/βPIX, but neither Caveolin1 (Cav1) nor Cavin1. Strikingly, when keratinocytes are stretched or hypo-osmotically shocked, α6β4 integrin accumulates at cell edges, whereas Cav1 disappears from it. This process, which is isotropic relative to the orientation of stretch, depends on Arf6, Cav1 and Cavin1. We propose that mechanically-induced HD growth involves the isotropic flattening of caveolae (known for their mechanical buffering role) associated with integrin diffusion and turnover.
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