Decorin is a novel antagonistic ligand of the Met receptor.
Decorin, a member of the small leucine-rich proteoglycan gene family, impedes tumor cell growth by down-regulating the epidermal growth factor receptor. Decorin has a complex binding repertoire, thus, we predicted that decorin would modulate the bioactivity of other tyrosine kinase receptors. We discovered that decorin binds directly and with high affinity (K(d) = approximately 1.5 nM) to Met, the receptor for hepatocyte growth factor (HGF). Binding of decorin to Met is efficiently displaced by HGF and less efficiently by internalin B, a bacterial Met ligand. Interaction of decorin with Met induces transient receptor activation, recruitment of the E3 ubiquitin ligase c-Cbl, and rapid intracellular degradation of Met (half-life = approximately 6 min). Decorin suppresses intracellular levels of beta-catenin, a known downstream Met effector, and inhibits Met-mediated cell migration and growth. Thus, by antagonistically targeting multiple tyrosine kinase receptors, decorin contributes to reduction in primary tumor growth and metastastic spreading.
Pubmed ID: 19433454 RIS Download
Binding, Competitive | Cell Proliferation | Decorin | Extracellular Matrix Proteins | Half-Life | HeLa Cells | Humans | Ligands | Neoplasm Metastasis | Neoplasms | Protein Binding | Proteoglycans | Proto-Oncogene Proteins c-cbl | Proto-Oncogene Proteins c-met | beta Catenin