Focal adhesion kinase N-terminus in breast carcinoma cells induces rounding, detachment and apoptosis. (original) (raw)

Biochem J. 2003 Jul 1; 373(Pt 1): 201–210.

Department of Surgery, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Abstract

Focal adhesion kinase (FAK) has a central role in adhesion-mediated cell signalling. The N-terminus of FAK is thought to function as a docking site for a number of proteins, including the Src-family tyrosine kinases. In the present study, we disrupted FAK signalling by expressing the N-terminal domain of FAK (FAK-NT) in human breast carcinoma cells, BT474 and MCF-7 lines, and non-malignant epithelial cells, MCF-10A line. Expression of FAK-NT led to rounding, detachment and apoptosis in human breast cancer cells. Apoptosis was accompanied by dephosphorylation of FAK Tyr(397), degradation of the endogenous FAK protein and activation of caspase-3. Over-expression of FAK rescued FAK-NT-mediated cellular rounding. Expression of FAK-NT in non-malignant breast epithelial cells did not lead to rounding, loss of FAK phosphorylation or apoptosis. Thus FAK-NT contributes to cellular adhesion and survival pathways in breast cancer cells which are not required for survival in non-malignant breast epithelial cells.

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Selected References

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