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Tumor Biology |
Institute of Biochemistry, University of Lausanne, CH-1066 Epalinges, Switzerland [F. C. B., C. B., A. F. G. Q.], and Chirurgische Universitätsklinik, D-39120 Magdeburg, Germany [M. A. R.]
Caveolin-1 expression and function were investigated in human colon cancer. Low levels of caveolin-1 mRNA and protein were detected in several colon carcinoma cell lines. Moreover, caveolin-1 protein levels were significantly reduced in human tumor epithelial mucosa (3.6 ± 1.4-fold) when compared with normal colon mucosa for a majority (10 of 15) of the patients characterized. To directly assess the role of caveolin-1 in tumor development, caveolin-1 was reexpressed in the HT29 and DLD1 colon carcinoma cells, and the resulting HT29-cav-1 or DLD1-cav-1 cells were tested for tumorigenicity in nude mice. In most experiments, tumor formation was either blocked or retarded for HT29-cav-1 cells (10 of 13 mice) and DLD1-cav-1 cells (5 of 7 mice), as compared with both mock-transfected and parental HT29 or DLD1 cells. Interestingly, basal caveolin-1 levels were significantly reduced in HT29-cav-1 and DLD1-cav-1 cells isolated from tumors. Likewise, endogenous caveolin-1 mRNA and protein levels were found to be reduced in NIH-3T3 cells recovered from tumors after injection into nude mice. Thus, reexpression of caveolin-1 in colon carcinoma lines reduced the probability of tumor formation in vivo, and when tumors did develop from either HT29-cav-1, DLD1-cav-1, or NIH-3T3 cells, lower basal levels of caveolin-1 were detected. Finally, evidence was obtained indicating that initial caveolin-1 down-regulation in colon cancer cells need not be an entirely irreversible process because cell survival on selection for either drug resistance or increased metastatic potential correlated with increased caveolin-1 expression levels.
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