title: N-cadherin association with lipid rafts regulates its dynamic assembly at cell-cell junctions in C2C12 myoblasts.
abstract: Cadherins are homophilic cell-cell adhesion molecules implicated in cell growth, differentiation, and organization into tissues during embryonic development. They accumulate at cell-cell contact sites and act as adhesion-activated signaling receptors. Here, we show that the dynamic assembly of N-cadherin at cell-cell contacts involves lipid rafts. In C2C12 myoblasts, immunofluorescence and biochemical experiments demonstrate that N-cadherin present at cell-cell contacts is colocalized with lipid rafts. Disruption of lipid rafts leads to the inhibition of cell-cell adhesion and disorganization of N-cadherin-dependent cell-cell contacts without modifying the association of N-cadherin with catenins and its availability at the plasma membrane. Fluorescent recovery after photobleaching experiments demonstrate that at the dorsal plasma membrane, lipid rafts are not directly involved in the diffusional mobility of N-cadherin. In contrast, at cell-cell junctions N-cadherin association with lipid rafts allows its stabilization enabling the formation of a functional adhesive complex. We show that lipid rafts, as homophilic interaction and F-actin association, stabilize cadherin-dependent adhesive complexes. Homophilic interactions and F-actin association of N-cadherin are both required for its association to lipid rafts. We thus identify lipid rafts as new regulators of cadherin-mediated cell adhesion.
authors.affiliation: Centre de Recherches de Biochimie Macromoléculaire, Centre National de la Recherche Scientifique Formation de Recherche en Evolution 2593, 34293 Montpellier, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Causeret
authors.forename: Nicolas
authors.initials: N
authors.lastname: Taulet
authors.forename: Franck
authors.initials: F
authors.lastname: Comunale
authors.forename: Cyril
authors.initials: C
authors.lastname: Favard
authors.forename: Cécile
authors.initials: C
authors.lastname: Gauthier-Rouvière
mesh_terms: D000199:Actins / Q000378:metabolism; D000818:Animals; D015820:Cadherins / Q000378:metabolism*; D002460:Cell Line; D003598:Cytoskeletal Proteins / Q000378:metabolism; D036681:Fluorescence Recovery After Photobleaching; D007150:Immunohistochemistry; D007365:Intercellular Junctions / Q000378:metabolism*; D021962:Membrane Microdomains / Q000378:metabolism*; D051379:Mice; D008954:Models, Biological; D032448:Myoblasts, Skeletal / Q000378:metabolism*
chemical_list: D000199:Actins; D015820:Cadherins; D003598:Cytoskeletal Proteins
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