Metabolism and excretion of the liver-protective agent (+)-catechin in experimental hepatitis.
1. Following oral administration of [U-14C](+)-catechin to rats with galactosamine-hepatitis, the biliary and faecal elimination of (+)-catechin metabolites was decreased compared with that in normal animals, Renal excretion of (+)-catechin metabolites was enhanced in galactosamine-hepatitis. 2. Although the biliary metabolites were present in similar proportions in galactosamine-hepatitis animals and controls, the major urinary metabolite, 3'-O-methyl (+)-catechin sulphate, was markedly decreased whereas 3'-O-methyl(+)-catechin glucuronide was increased by over 100%. 3. The total overall excretion of 3'-O-methyl (+)-catechin conjugates in rats with galactosamine-hepatitis was similar to that in normal animals indicating that catechol-O-methyltransferase activity is not significantly depressed in galactosamine-hepatitis. 4. Clearance of radioactivity from the blood following i.v. administration of [U-14C]-(+)-catechin was prolonged in galactosamine-hepatitis. 5. Liver perfusion experiments demonstrated depressed glucuronylation of (+)-catechin metabolites in galactosamine-hepatitis, whereas in liver homogenates synthesis of glucuronide conjugates of (+)-catechin metabolites was enhanced. 6. Lung slices were able to metabolize (+)-catechin and the lung is proposed as an extrahepatic site of (+)-catechin metabolism of increased importance in galactosamine-hepatitis. 7. The effects of galactosamine-hepatitis upon the structure of the hepatocyte plasma membrane are discussed in relation to decreased biliary excretion and glucuronylation.
D000410:Alanine Transaminase / Q000097:blood; D000818:Animals; D001578:Benzopyrans / Q000378:metabolism*; D001646:Bile / Q000378:metabolism; D002392:Catechin / Q000378:metabolism*; D005243:Feces / Q000032:analysis; D005688:Galactosamine; D006520:Hepatitis, Animal / Q000139:chemically induced / Q000378:metabolism*; D006801:Humans; D008099:Liver / Q000378:metabolism*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors
D001578:Benzopyrans; D005688:Galactosamine; D002392:Catechin; D000410:Alanine Transaminase