Related Experiment Videos
Effects of potassium ethylxanthogenate on nitrosodiethylamine-induced DNA damage and on liver carcinogenesis
D Hadjiolov1, N Frank, N Hadjiolov
1Institute of Oncology, Sofia-Darvenza, Bulgaria.
Abstract:
BD-6 rats were injected with 80 mg/kg N-nitroso-diethylamine weekly for 10 weeks. Addition of 270 mg/kg potassium ethylxanthogenate weekly reduced significantly the number of rats developing NDEA-induced malignant liver tumors. Ethylxanthogenate decreased the total number of liver tumors induced by the carcinogen to 6 as compared to a total of 29 neoplasms in animals treated only with NDEA. In acute experiments potassium ethylxanthogenate markedly decreased the exhalation of 14CO2 derived from 14C-NDEA. The amount of the nonmetabolized carcinogen increased in the urine of ethylxanthogenate protected rats only 4% of the given dose. Initial DNA damage, single strand breaks and alkali-labile sites, was determined by alkaline sucrose gradients and in protected animals was minimal for at least 24 hours after NDEA administration. It appears that the production of less initial DNA damage may be important for the further course of liver carcinogenesis induced by relatively large doses of nitrosodiethylamine.
Insights
Potassium ethylxanthogenate significantly reduced N-nitroso-diethylamine (NDEA)-induced liver tumors in rats. This compound protected against DNA damage, suggesting a role in preventing NDEA-induced liver cancer.
Area of Science:
- Hepatocarcinogenesis
- Chemoprevention
- Toxicology
Background:
- Hepatocellular carcinoma is a significant global health concern.
- N-nitroso-diethylamine (NDEA) is a potent carcinogen that induces liver tumors.
- Identifying chemopreventive agents against NDEA-induced liver cancer is crucial.
Purpose of the Study:
- To investigate the chemopreventive effects of potassium ethylxanthogenate against NDEA-induced liver carcinogenesis in rats.
- To elucidate the mechanisms underlying the protective action of ethylxanthogenate.
Main Methods:
- BD-6 rats were administered NDEA weekly for 10 weeks.
- Potassium ethylxanthogenate was co-administered weekly.
- Tumor incidence and multiplicity were assessed.
- Metabolism of 14C-NDEA and DNA damage (single-strand breaks, alkali-labile sites) were analyzed.
Main Results:
- Potassium ethylxanthogenate significantly reduced the incidence of NDEA-induced malignant liver tumors.
- The total number of liver neoplasms decreased from 29 to 6 in protected rats.
- Ethylxanthogenate decreased 14CO2 exhalation from 14C-NDEA, indicating reduced metabolism.
- Non-metabolized NDEA increased in urine, and initial DNA damage was minimal in protected rats.
Conclusions:
- Potassium ethylxanthogenate exhibits significant chemopreventive activity against NDEA-induced liver carcinogenesis.
- Reduced metabolic activation of NDEA and decreased initial DNA damage are likely mechanisms of protection.
- Ethylxanthogenate holds potential as a therapeutic agent for preventing liver cancer induced by nitrosamines.