Co-operative effect of c-Src and ezrin in deregulation of cell-cell contacts and scattering of mammary carcinoma cells.

Abstract:

:The non-receptor tyrosine kinase c-Src is activated in many human cancer types, and induces deregulation of cadherin-based cell-cell contacts and actin cytoskeleton. Because ezrin, a protein which cross-links the plasma membrane with the actin cytoskeleton, is often over-expressed in human cancers, and participates in cell adhesion, motility, and cell scattering, we therefore investigated whether c-Src co-operates with ezrin in regulating cell-cell contacts in a murine mammary carcinoma cell line, SP1. SP1 cells over-expressing wild type ezrin, or an activated c-Src mutant, formed loose aggregates which scattered spontaneously when plated on plastic. When wild type ezrin and activated c-Src were co-expressed, scattering was increased, cell-cell contacts disrupted, and cell aggregation prevented. Pre-treatment with the c-Src family kinase inhibitor PP2 partially restored aggregation of cells expressing activated c-Src and wild type ezrin, indicating that c-Src family kinases act co-operatively with ezrin in regulating cell-cell contacts. Furthermore, expression of a truncated NH2-terminal domain of ezrin, which has dominant negative function, blocked the cell scattering effect of activated c-Src and promoted formation of cohesive cell-cell contacts. Together, these results suggest co-operativity between c-Src and ezrin in deregulation of cell-cell contacts and enhancing scattering of mammary carcinoma cells.

journal_name

J Cell Biochem

authors

Elliott BE,Qiao H,Louvard D,Arpin M

doi

10.1002/jcb.20033

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

16-28

issue

1

eissn

0730-2312

issn

1097-4644

journal_volume

92

pub_type

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