RESUMO
The comparative effects of colchicine (10 µg day-1, p.o.) and silymarin (50 mg kg-1, p.o.) each given for 5 days a week on the chronica carbon tetrachloride (CCl4) liver damage were studied. Treatment with CCl4, resulted in a marked reduction of Na+, K+, and Ca2+-ATPases in plasma liver membranes as compared to vehicles or either silymain or chochicine alone. Collagen content in livers of animals treated with CCl4 was increased about four-folds as compared to controls and histological examination of liver samples showed thad collagen incfrease distorted the normal liver architecture. Colchicine or silymarin treatment completely prevented all the changes observed in CCl4-cirrhotic rats (namely, lipid peroxidation, Na+, k+ and Ca2+-ATPases), except for livel collagen conten which was reduced only 55 percent as compared with CCl4-treated rats and for alkaline phosphatase and glutamic pyruvic transminase wich still remained above controls. In the CCl4 + silymarin group, the loss of glycogen content was completely prevented. However, when rats were treated with CCl4+colchicine, liver glycogen content could not be restored. The hepatoprotective effects of colchicine or silymarin were very similar in regard to the prevention of chronic liver damage