Breast cancer anti-estrogen resistance protein 1 (p130Cas) is a docking protein that plays a central coordinating role for tyrosine kinase-based signaling related to cell adhesion (1). It has a defined function in cardiovascular development, actin filament assembly and Src-induced transformation (2). p130Cas is highly phosphorylated at tyrosines during transformation by v-Src, as well as by v-Crk, forming stable complexes with these oncoproteins. Cytoplasmic p130Cas has been shown to move to the membrane upon tyrosine phosphorylation. p130Cas is a common cellular target of phosphorylation signal via v-Crk and v-Src oncoproteins, and its unique structure indicates its possible role in assembling signals from multiple SH2-containing molecules (3). It is implicated in induction of cell migration, and over expression of p130Cas confers anti-estrogen resistance on breast cancer cells (1).
EGFR1 Signaling Pathway
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