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First published online 5 May 2004
doi: 10.1242/jcs.01148

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Recruitment of Pyk2 and Cbl to lipid rafts mediates signals important for actin reorganization in growing neurites

¹ Institute for Biochemistry II, Building 75, Goethe University Medical School, Theodor-Stern-Kai 7, 60590 Frankfurt am Main, Germany
² Ludwig Institute for Cancer Research, Box 595, Husargatan 3, Uppsala, 75124, Sweden
³ Fox Chase Cancer Center, 7701 Burholme Avenue, Philadelphia, PA 19111, USA

^* Author for correspondence (e-mail: ivan.dikic{at}biochem2.de)

Accepted 10 February 2004

Protein tyrosine kinase Pyk2 and multifunctional adaptor protein Cbl are implicated in the regulation of the cytoskeleton in several cell types. We report that Pyk2 and Cbl form a signaling complex that is translocated to lipid rafts and is enriched in growth cones of differentiating PC12 cells following growth factor stimulation. We found that Pyk2 and Cbl interacted with the adaptor protein ArgBP2, which also bound to flotillin-1, a component of lipid raft microdomains. These interactions contributed to recruitment of the Pyk2/Cbl complex to lipid raft compartments. In addition, Pyk2, Cbl and ArgBP2 were found co-localized with actin in axons and growth cones of differentiated PC12 cells. Moreover, co-expression of Pyk2, ArgBP2 and Cbl facilitated growth factor-induced formation of lamellipodia at the tip of neurites. Formation of these growth cone lamellipodia was dependent on intact lipid rafts and the Cbl-associated effectors Crk and phosphatidylinositol 3 (PI 3)-kinase. Our results indicate that recruitment of Pyk2/Cbl complexes to lipid rafts participates in growth factor-induced regulation of the actin cytoskeleton in growing neurites.

Key words: Pyk2, Cbl, ArgBP2, PC12 cells, Neurite outgrowth, Lipid rafts

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