title: Effect of treatment with hemin on rat liver catalase.
abstract: Rats were injected with a single or repeated doses of hemin intraperitoneally, and the effect on liver catalase [EC 1.11.1.6] was studied. A single administration of hemin caused a reduction in the concentration of liver catalase, both in enzymatic activity and in catalase protein determined immunochemically. The reduction occurred a few hours after the hemin injection, and is probably due to stimulated degradation. Disappearance of radioactivity from liver catalase prelabelled with [14C]leucine was enhanced following the administration of hemin. No evidence for a repression in vivo incorporation of [14C]leucine and [3H]sigma-aminolevulinic acid into liver catalase was obtained with hemin-treated rats. When the hemin was given repeatedly at 12-h intervals, the level of liver catalase decreased considerably. However, the impairment in catalase-synthesizing activity of liver cells of rats thus treated was rather slight, when examined in a cell-free system. Some differences were noted between the results in the present study and those in previous investigations with Sedormid-treated rats.
mesh_terms: D000818:Animals; D002250:Carbon Radioisotopes; D002374:Catalase / Q000096:biosynthesis* / Q000378:metabolism; D006418:Heme / Q000031:analogs & derivatives*; D006427:Hemin / Q000494:pharmacology*; D007553:Isotope Labeling; D007700:Kinetics; D008099:Liver / Q000201:enzymology*; D014176:Protein Biosynthesis / Q000187:drug effects; D051381:Rats; D012270:Ribosomes / Q000187:drug effects / Q000201:enzymology; D014316:Tritium
chemical_list: D002250:Carbon Radioisotopes; D014316:Tritium; D006418:Heme; D006427:Hemin; D002374:Catalase