P130Cas Substrate Domain Signaling Promotes Migration, Invasion, and Survival of Estrogen Receptor-negative Breast Cancer Cells

Overview

Journal Breast Cancer (Dove Med Press)

Publisher Dove Medical Press

Date 2013 Dec 25

PMID 24367162

Citations 21

Authors

Anna C Cunningham-Edmondson

Steven K Hanks

Affiliations

Soon will be listed here.

Abstract

Elevated Src tyrosine kinase activity is commonly observed in breast cancer and likely contributes to neoplasia and malignancy. p130Cas ("Crk-associated substrate") is a major Src substrate found at the sites where integrins mediate cell adhesion to the extracellular matrix. Src phosphorylates multiple tyrosines in the p130Cas "substrate domain" (SD) and this signaling event has been implicated in the promotion of cell motility, primarily from studies on fibroblasts. In breast cancer, studies on p130Cas have focused on its role in conferring antiestrogen resistance to cells that express the estrogen receptor (ER+). However, little is known regarding the role of p130Cas in the more aggressive estrogen receptor negative (ER-) breast cancers for which there is a need for development of effective targeted therapies. We found high levels of p130Cas SD tyrosine phosphorylation to be a common characteristic of ER- breast cancer cell lines, with particularly high levels observed for the BT-549 cell line. Using RNA interference to knock down p130Cas expression in BT-549 cells, combined with rescue by WT p130Cas versus a signaling-deficient control, we provide evidence that p130Cas SD tyrosine phosphorylation is an important signaling event in the migration, invasion, proliferation, and survival of this ER-breast cancer cell line.

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