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Taenia taeniaeformis: inhibition of metacestode development in the rat by gossypol
Abstract:
The effect of gossypol, a polyphenolic compound, on developing Taenia taeniaeformis larvae in the rat liver was examined. Five groups of rats were used. In group 1, subcutaneous injection of gossypol at 10 mg/kg was started 5 days prior to administration of tapeworm eggs. In group 2, gossypol injections were started 5 days after administration of eggs. Groups 3 and 4 were infected and noninfected rats, respectively, which received the vehicle (10% ethyl alcohol in 0.85% NaCl) only. Group 5 rats were noninfected but received gossypol. From each group, 5 rats were killed on days 7, 12, and 22 of infection, respectively. The number and size of larvae and the size of the livers were much less in rats gossypol injected 5 days before infection than those in the vehicle-treated group. Administration of gossypol 5 days after infection resulted in less inhibition. The size and the thickness of the fibrous capsule around larvae of the gossypol-treated rats were much smaller than those of the control-infected group. The actively developing larvae excrete or secrete a sulfated glycosaminoglycan which is specifically stained with alcian blue. There was much more alcian blue-positive substance around the larvae and the capsule of the control-infected liver compared to the gossypol-treated infected animal. The percentage body weight of the spleen was significantly greater in the gossypol-treated rats in both infected and noninfected groups. These results suggest that gossypol may directly inhibit tapeworm larval development or that elimination of the tapeworm may be resulted from gossypol-induced stimulation of host cell-mediated immunity.
Insights
Gossypol, a natural compound, significantly inhibited Taenia taeniaeformis tapeworm larval development in rats, especially when administered before infection. This suggests gossypol may be a potential anthelmintic agent.
Area of Science:
- Parasitology
- Pharmacology
- Immunology
Background:
- Taenia taeniaeformis is a tapeworm parasite that infects rodents.
- Gossypol is a polyphenolic compound found in cotton seeds with known biological activities.
Purpose of the Study:
- To investigate the effect of gossypol on the development of Taenia taeniaeformis larvae in a rat model.
- To explore the potential of gossypol as an anthelmintic treatment.
Main Methods:
- Rats were divided into five groups, with gossypol administered either before or after infection with tapeworm eggs.
- Larval development, liver size, and host immune responses were assessed at different time points.
- Histological analysis, including alcian blue staining, was used to evaluate larval encapsulation and secretions.
Main Results:
- Gossypol administration prior to infection significantly reduced larval number, size, and liver size compared to controls.
- Pre-treatment with gossypol also resulted in thinner fibrous capsules around larvae.
- Alcian blue staining indicated reduced glycosaminoglycan secretion around larvae in gossypol-treated rats.
- Spleen weight increased in gossypol-treated rats, suggesting an immune response.
Conclusions:
- Gossypol exhibits significant inhibitory effects on Taenia taeniaeformis larval development in rats.
- The anthelmintic effect may be due to direct inhibition of larval growth or stimulation of host immunity.
- Gossypol shows potential as a therapeutic agent against tapeworm infections.