Malignant neoplasms in rats fed lasiocarpine

Area of Science:

• Toxicology
• Carcinogenesis
• Animal Studies

Background:

• Pyrrolizidine alkaloids are naturally occurring compounds found in various plants.
• Lasiocarpine is a known pyrrolizidine alkaloid with suspected toxic properties.

Purpose of the Study:

• To investigate the carcinogenic potential of lasiocarpine in a rodent model.
• To determine the types and incidence of tumors induced by lasiocarpine exposure.

Main Methods:

• Male F-344 rats were fed a diet containing lasiocarpine (50/10^6) for 55 weeks.
• Tumor development and type were monitored throughout the study period.
• Tumor transplantation was attempted for one induced angiosarcoma.

Main Results:

• 17 out of 20 rats developed malignant tumors.
• Liver angiosarcomas occurred in 45% of rats, and hepatocellular carcinomas in 35%.
• Other tumors included skin adnexal tumors and lymphoma; lung metastases were observed.

Conclusions:

• Lasiocarpine is a potent carcinogen in F-344 rats, primarily targeting the liver.
• The study demonstrates a high incidence of angiosarcomas and hepatocellular carcinomas following lasiocarpine exposure.
• Induced angiosarcoma showed successful transplantation, indicating its malignant potential.