title: Alterations in hepatic microsomal protein levels in rainbow trout fed cyclopropenoid fatty acids analyzed by two-dimensional gel electrophoresis.
abstract: Two-dimensional gel electrophoresis was used to analyze the effect of dietary cyclopropenoid fatty acids on hepatic microsomal polypeptide distribution patterns. Antibodies against rainbow trout type-LM2 cytochrome P-450 were employed to localize the corresponding polypeptide(s) by immunochemical staining. The LM2 antigen was purified from trout that had been fed beta-naphthoflavone. Microsomes from trout fed beta-naphthoflavone showed a decrease in a cytochrome P-450 polypeptide, detected with antibody against LM2. In contrast, microsomes from control fish contained two distinct cytochrome P-450 polypeptides, differing in their isoelectric points. Cyclopropenoid fatty acid treatment caused a preferential decrease in the additional isozyme seen in control samples. The distribution of concanavalin-A-binding glycopolypeptides was also assessed. Surprisingly, the two P-450 isozymes localized from control microsomes were found to bind concanavalin A. In addition to this, the cyclopropenoid fatty acid treatment generated a shift in a closely related group of microsomal glycopolypeptides, labeled gp80, gp82, gp80(1), and gp82(1). A decrease in the levels of gp80 and gp82 and a corresponding increase in gp80(1) and gp82(1) was observed.
mesh_terms: D000818:Animals; D004042:Dietary Fats, Unsaturated / Q000494:pharmacology*; D004591:Electrophoresis, Polyacrylamide Gel; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D008565:Membrane Proteins / Q000378:metabolism*; D008862:Microsomes, Liver / Q000378:metabolism*; D013194:Staining and Labeling; D014337:Trout
chemical_list: D004042:Dietary Fats, Unsaturated; D005231:Fatty Acids, Unsaturated; D008565:Membrane Proteins