CD44 and Beta1 Integrins Mediate Ovarian Carcinoma Cell Migration Toward Extracellular Matrix Proteins

Overview

Journal Clin Exp Metastasis

Specialty Oncology

Date 2001 Feb 24

PMID 11206841

Citations 41

Authors

R C Casey

A P Skubitz

Affiliations

Soon will be listed here.

Abstract

Epithelial cancer of the ovary spreads by implantation of tumor cells onto the mesothelial cells that line the peritoneal cavity. The aim of this study was to identify the cell-matrix interactions that mediate ovarian carcinoma cell migration toward components of the mesothelial cell-associated extracellular matrix. The human ovarian carcinoma cell lines NIH:OVCAR5 and SKOV3 were analyzed by flow cytometry for the expression of cell surface receptors. The ability of those receptors to mediate ovarian carcinoma cell migration toward fibronectin, type IV collagen, and laminin was determined. A monoclonal antibody against the beta1 integrin subunit abrogated the migration of both cell lines toward the extracellular matrix proteins. Blocking antibodies against alpha integrin subunits suggest that ovarian carcinoma cell migration toward fibronectin is primarily mediated by the alpha5beta1 integrin, type IV collagen by the alpha2beta1 integrin, and laminin by the alpha6beta1 integrin. These results suggest that ovarian carcinoma cell migration is regulated by multiple beta1 integrin-matrix interactions. Significant reduction of cell migration was observed with a monoclonal antibody against CD44 that blocks the hyaluronan-binding site of CD44, but not with an antibody that binds at an alternate site on CD44. Intact hyaluronan and/or hyaluronan oligomers also inhibited cell migration, suggesting that the CD44-hyaluronan interaction provides an integrin-independent mechanism of control for ovarian carcinoma cell migration. These results suggest that ovarian carcinoma cell migration is regulated by both integrin-dependent mechanisms, involving the interaction of beta1 integrins with extracellular matrix proteins, and an integrin-independent mechanism that involves the interaction of CD44 and hyaluronan.

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