[Expression of tumor metastasis suppressor gene KAI1/CD82 in human cancer cell lines with different metastasis...

To investigate the correlation of a newly-defined tumor metastasis suppressor gene KAI1/CD82 and metastatic potential of human cancer cell lines.

Expressions of KAI1/CD82 in eight human cancer cell lines of prostate, lung and melanoma with different metastasis potential were studied by Northern blot hybridization and the mutation were detected by PCR-SSCP.

Expressions of KAI1 mRNA decreased in human prostate cancer cell lines PC3 and PC3M, and lung cancer cell line PG which were metastatic cancer cell lines (integral light density values: 0.0319, 0.0266 and 0.0549, respectively). Expression of KAI1 mRNA showed high level in PAa, a human lung cancer cell line with no metastasis (integral light density value: 0.7313). In human melanoma cell lines with different metastasis potential (WM35, WM1341b, WM983a and WM451), expression of KAI1 showed moderate expression (integral light density values are 0.1798, 0.1582, 0.1501, 0.1800 respectively). PCR-SSCP analysis indicated the existence of band shift in exon 7 of KAI1 gene in PC3, PG and PC3M.

Decreased KAI1/CD82 expression may be associated with enhanced metastatic potential in prostate cancer cell lines and lung cancer cell line other than melanoma cell lines. The decreased expression may be partially nelaled with mutation of KAI1 gene.