Effect of paraquat administered intraperitoneally on the nonpolar lipids of rabbits.

Rabbits were injected intraperitoneally with 3, 6, or 12 mg of paraquat/kg/day for a period of 3, 7, or 14 days. Rabbits receiving 3 or 6 mg of paraquat/kg/day showed a significant loss of body weight at 7 days of the treatment. Liver, kidney, heart, and lungs demonstrated a significant decrease in their weights in the first 3 days of paraquat treatment. A decrease in total lipids, total triglycerides, and total cholesterol of both liver and kidney was observed. This decrease was accompanied by a significant increase in plasma total triglycerides and total cholesterol at 7 days of paraquat treatment. The ratio of cholesterol to cholesterol esters in liver decreased after 3 days of paraquat treatment after which it showed a consistent increase until the 14th day of the paraquat treatment. In kidney, this ratio increased for up to 7 days of paraquat treatment followed by a decrease at the 14th day. These results indicate, contrary to earlier reports, that rabbits are susceptible to paraquat toxicity.