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Antitumor effects of gossypol on murine tumors
Abstract:
Since the male antifertility drug, gossypol, was shown to be a specific inhibitor of DNA synthesis at moderately low doses in cultured cells, its antitumor potential has been evaluated in three murine tumor models. The effects of gossypol on tumor growth and the survival of 10- to 12-week-old BDF1 mice bearing mouse mammary adenocarcinoma 755 (Ca 755) or P388 or L1210 leukemias, all injected IP, were measured. At an optimum dose of 0.5 mg/mouse given as a single injection at 2 days (48 h) after the inoculation of 10(5) Ca 755 tumor cells, gossypol rendered 66% of the mice free of tumor cells, whereas the remaining 34% died of drug toxicity. The survival rate decreased sharply at doses on either side of the optimum. At suboptimal doses a major proportion of the tumor-bearing mice died of tumor, whereas at higher doses all the animals died of drug toxicity. In other words, the effective dose range of gossypol was rather narrow. The rapidly proliferating mouse leukemias, P388 and L1210, failed to respond to gossypol. Histopathological studies of various organs in the gossypol-treated mice revealed no consistent lesions that could give an indication of organ-specific toxicity of gossypol. The reduction in the myeloid series in the bone marrow of gossypol-treated mice may have been due to depletion rather than direct toxic effect. Further studies are essential to evaluate this compound with regard to its antitumor activity in other murine models.
Insights
Gossypol, an antifertility drug, showed antitumor potential against mouse mammary adenocarcinoma 755 by inhibiting DNA synthesis. However, its narrow effective dose range and lack of efficacy against leukemias warrant further investigation in other models.
Area of Science:
- Oncology
- Pharmacology
- Molecular Biology
Background:
- Gossypol is a male antifertility drug.
- Gossypol specifically inhibits DNA synthesis at moderate doses in cultured cells.
Purpose of the Study:
- To evaluate the antitumor potential of gossypol.
- To assess gossypol's effects on tumor growth and survival in murine models.
Main Methods:
- Three murine tumor models were used: mouse mammary adenocarcinoma 755 (Ca 755), P388 leukemia, and L1210 leukemia.
- Gossypol was administered via intraperitoneal injection.
- Tumor growth and animal survival were measured.
Main Results:
- Gossypol demonstrated antitumor activity against Ca 755 at an optimal dose, with 66% of mice becoming tumor-free.
- A narrow effective dose range was observed for gossypol, with toxicity at higher doses and tumor mortality at suboptimal doses.
- Rapidly proliferating leukemias (P388 and L1210) did not respond to gossypol treatment.
- Histopathological studies showed no consistent organ-specific toxicity, though bone marrow myeloid series reduction was noted.
Conclusions:
- Gossypol exhibits potential antitumor activity against certain solid tumors like Ca 755.
- The narrow therapeutic window and lack of efficacy against leukemias limit gossypol's broad applicability.
- Further research is needed to explore gossypol's antitumor potential in other murine models.