Human platelet-derived growth factor (PDGF) receptor, is a receptor tyrosine kinase whose activity induces various signalling cascades leading to cell growth and proliferation. Phosphorylation of Tyrosine 857 (pY857) in the catalytic loop of the PDGF Receptor beta has been shown to increase kinase activity. Two major isoforms exist, PDGF receptor-? and PDGF receptor-?. PDGF receptor-? can only bind two specific PDGF isoforms, PDGF-? and PDGF-? (1,2). Upon ligand binding, the receptor undergoes autophosphorylation, allowing binding and activation of cytoplasmic SH2 domain-containing signal transduction molecules such as PI kinase (3), Grb2, and Src, among others.
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