Dynamin forms a Src kinase-sensitive complex with Cbl and regulates podosomes and osteoclast activity

Angela Bruzzaniti, Lynn Neff, Archana Sanjay, William C. Horne, Pietro De Camilli, Roland Baron

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

Podosomes are highly dynamic actin-containing adhesion structures found in osteoclasts, macrophages, and Rous sarcoma virus (RSV)-transformed fibroblasts. After integrin engagement, Pyk2 recruits Src and the adaptor protein Cbl, forming a molecular signaling complex that is critical for cell migration, and deletion of any molecule in this complex disrupts podosome ring formation and/or decreases osteoclast migration. Dynamin, a GTPase essential for endocytosis, is also involved in actin cytoskeleton remodeling and is localized to podosomes where it has a role in actin turnover. We found that dynamin colocalizes with Cbl in the actin-rich podosome belt of osteoclasts and that dynamin forms a complex with Cbl in osteoclasts and when overexpressed in 293VnR or SYF cells. The association of dynamin with Cbl in osteoclasts was decreased by Src tyrosine kinase activity and we found that destabilization of the dynamin-Cbl complex involves the recruitment of Src through the proline-rich domain of Cbl. Overexpression of dynamin increased osteoclast bone resorbing activity and migration, whereas overexpression of dynK44A decreased osteoclast resorption and migration. These studies suggest that dynamin, Cbl, and Src coordinately participate in signaling complexes that are important in the assembly and remodeling of the actin cytoskeleton, leading to changes in osteoclast adhesion, migration, and resorption.

Original languageEnglish (US)
Pages (from-to)3301-3313
Number of pages13
JournalMolecular Biology of the Cell
Volume16
Issue number7
DOIs
StatePublished - Jul 1 2005
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'Dynamin forms a Src kinase-sensitive complex with Cbl and regulates podosomes and osteoclast activity'. Together they form a unique fingerprint.

  • Cite this