title: Autodegradation of lysosomal cysteine proteinases.
abstract: Repeated injections of Ep-475, a potent cysteine proteinase inhibitor, into rats caused several-fold increase in the hepatic contents of the lysosomal cysteine proteinases cathepsin B, H and L and in the activities of other lysosomal hydrolases. The rates of degradation of these lysosomal enzymes, estimated by repeated injections of cycloheximide, were found to be retarded in Ep475-treated rats, indicating that lysosomal cysteine proteinases are involved in degradation of lysosomal enzymes including proteinases.
mesh_terms: D000818:Animals; D002403:Cathepsins / Q000378:metabolism*; D003546:Cysteine Endopeptidases; D010450:Endopeptidases / Q000378:metabolism*; D006867:Hydrolases / Q000378:metabolism; D007700:Kinetics; D007930:Leucine / Q000031:analogs & derivatives* / Q000494:pharmacology; D008099:Liver / Q000201:enzymology*; D008247:Lysosomes / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D011480:Protease Inhibitors / Q000494:pharmacology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D011480:Protease Inhibitors; C032425:N-(N-(3-carboxyoxirane-2-carbonyl)leucyl)isoamylamine; D006867:Hydrolases; D002403:Cathepsins; D010450:Endopeptidases; D003546:Cysteine Endopeptidases; D007930:Leucine