C-Kit is the receptor tyrosine kinase for stem cell factor (SCF) and is a member of the subfamily that includes PDGF, CSF-1 and FLT-3/flk-2 receptors . It plays critical controlling roles in a number of cell types such as hematopoietic stem cells, mast cells, melanocytes and germ cells . Upon binding with its ligand, c-Kit receptors are induced undergoing dimerization/ oligomerization and autophosphorylation. Activation of c-Kit results in the recruitment and tyrosine phosphorylation of downstream SH2-containing signaling components including PLCgamma, p85 subunit of PI3 kinase, SHP2 and CrkL, which links c-Kit directly to various cell signaling pathways. Molecular lesions that impair the kinase activity of c-Kit are associated with a variety of developmental disorders , while mutations that constitutively activate c-Kit can lead to pathogenesis of mastocytosis and gastrointestinal stromal tumors . Tyrosine 719 is located in the kinase insert region of the catalytic domain. c-Kit phosphorylated at Tyr719 binds to the p85 subunit of PI3 kinase in vitro and in vivo (7).
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