PURPOSE: Advanced ovarian cancers are initially responsive to combinatorial chemotherapy with platinum drugs and taxanes but, in most cases, develop drug resistance. We recently showed that, in vitro, hepatocyte growth factor (HGF) enhances death of human ovarian cancer cell lines treated with cisplatin (CDDP) and paclitaxel. The present study addresses whether in vivo HGF makes ovarian carcinoma cells more responsive to these chemotherapeutics.
EXPERIMENTAL DESIGN: Using Lentiviral vectors carrying the HGF transgene, we transduced SK-OV-3 and NIH:OVCAR-3 ovarian carcinoma cell lines to obtain stable autocrine and paracrine HGF receptor activation. In vitro, we assayed growth, motility, invasiveness, and the response to CDDP and paclitaxel of the HGF-secreting bulk unselected cell populations. In vivo, we tested the cytotoxic effects of the drugs versus s.c. tumors formed by the wild-type and HGF-secreting cells in immunocompromised mice. Tumor-bearing mice were treated with CDDP (i.p.) and paclitaxel (i.v.), combined in different schedules and doses.
RESULTS: In vitro, HGF-secreting cells did not show altered proliferation rates and survival but were strongly sensitized to the death triggered by CDDP and paclitaxel, alone or in combination. In vivo, we found a therapeutic window in which autocrine/paracrine HGF made tumors sensitive to low doses of the drugs, which were ineffective on their own.
CONCLUSIONS: These data provide the proof-of-concept that in vivo gene therapy with HGF might be competent in sensitizing ovarian cancer cells to conventional chemotherapy.
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- Blotting, Western
- Cell Line, Tumor
- Cisplatin/therapeutic use
- Drug Resistance, Neoplasm/drug effects
- Flow Cytometry
- Genetic Therapy/methods
- Genetic Vectors
- Hepatocyte Growth Factor/genetics
- In Vitro Techniques
- Ovarian Neoplasms/drug therapy
- Paclitaxel/therapeutic use
- Reverse Transcriptase Polymerase Chain Reaction