SUPPRESSION OF GELATINASE PRODUCTION WITH DECREASED INVASIVENESS OF CHORIOCARCINOMA CELLS BY HUMAN RECOMBINANT INTERFERON-BETA

OBJECTIVE: Choriocarcinoma is a highly invasive gynecologic tumor, and hematogenous metastases frequently develop. To establish a molecular basis for antiinvasion therapy of choriocarcinoma, we examined the effects of human recombinant interferons an gelatinase production and invasion by choriocarcinoma cells. STUDY DESIGN: Using five choriocarcinoma cell lines, we measured gelatinase activity by gelatin zymography. The effects of recombinant interferons (rlFN-alpha, rlFN-beta, and rlFN-gamma) were then analyzed by Western blot analysis and chemoinvasion assay. RESULTS: High levels of 72 kd gelatinase activity were detected in the highly invasive choriocarcinoma cell lines, two of which also contained an active form of 72 kd gelatinase with an apparent molecular mass of 68 kd. Gelatinase production was decreased by incubation with rIFN-beta. In the chemoinvasion assay, only rlFN-beta had an inhibitory effect on the invasiveness of tumor cells without a cytotoxic effect. CONCLUSION: Choriocarcinoma cells showed high 72 kd gelatinase activity, which suggested a role for the enzyme in vascular metastasis. Studies on the use of rlFN-beta to inhibit metastasis of choriocarcinoma via suppression of gelatinase production are warranted.