Cadherin-11 interacts with the FGF receptor and induces neurite outgrowth through associated downstream signalling
- PMID: 18302981
- DOI: 10.1016/j.cellsig.2008.01.008
Cadherin-11 interacts with the FGF receptor and induces neurite outgrowth through associated downstream signalling
Abstract
Cadherin-11 is a cell-cell adhesion molecule whose expression is often correlated with cellular migratory phenomena. We recently demonstrated that cadherin-11 activation by immobilized cad11-Fc (cadherin-11 ectodomain fused to Fc fragment) promotes axonal extension of spinal cord explants. Here, we show that this induced neurite outgrowth is dependent on the FGF receptor (FGFR) activity. Downstream, DAG lipase/CAM kinase and PI3 kinase pathways are required, but not the MAP kinase signalling. We also demonstrate that a tagged form of FGFR1 co-immunoprecipitates with beta-catenin containing cadherin-11 immunocomplexes. FGFR1 and beta-catenin show colocalization and enhanced association during cadherin-11 engagement, suggesting that FGFR1 interaction with cadherin-11 adhesion complexes is reinforced during cell contact formation. In vitro pull-down experiments using recombinant ectodomains suggest that cadherin-11/FGFR interact directly through their extracellular domains. Altogether, we propose that cadherin-11 recruits the FGFR upon adhesive engagement at nascent contacts, triggering the activation of downstream pathways involved in growth cone progression.
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