Expression and function of beta 1 and alpha v beta 3 integrins in ovarian cancer

Gynecologic Oncology
S A CannistraJ DiCarlo

Abstract

Ovarian cancer cells disseminate by implanting onto the peritoneal mesothelial cell surface of the abdominal cavity. A common feature of these peritoneal implants is the presence of tumor cell invasion into the submesothelial extracellular matrix (ECM). In view of the important role of integrins in ECM recognition and cell migration, we were interested in defining the pattern of integrin expression and function in ovarian cancer cell lines and primary tissue samples. The beta 1 integrin chain was expressed by CAOV-3, SKOV-3, OVCAR-3, and SW626 ovarian cancer cell lines, associated with expression of alpha 1, -2, -3, -5, and -6 chains. The alpha 4 chain was also expressed by two of the four lines. In addition to beta 1 integrins, the alpha v beta 3 integrin was also expressed, although there was no expression of beta 2, -4, and -7 chains. Immunoprecipitation of surface-labeled CAOV-3 cells with an anti-beta 1 antibody revealed a band at approximately 110-130 kDa consistent with the known molecular mass of the beta 1 chain, as well as several associated bands consistent with noncovalently linked integrin alpha chains. A similar pattern of beta 1 and alpha v beta 3 integrin expression was observed for primary ovarian cancer tissue...Continue Reading

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