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J. Biol. Chem., Vol. 258, Issue 7, 4220-4225, 04, 1983

Induction of heme oxygenase in rat liver. Increase of the specific mRNA by treatment with various chemicals and immunological identity of the enzymes in various tissues as well as the induced enzymes

S Ishizawa, T Yoshida and G Kikuchi

A specific antibody was prepared against rat liver heme oxygenase which had been induced by bromobenzene treatment. Immunochemical studies with this antibody (IgG) revealed that heme oxygenases from livers of rats treated with hemin, Cd2+, Co2+, or bromobenzene from rat spleen and also from kidney of Sn2+-treated rats were all immunochemically identical. Cell-free synthesis of heme oxygenase was performed in a rabbit reticulocyte lysate system using polysomes isolated from livers of rats treated with either hemin, Cd2+, or bromobenzene, and it was found that translatable mRNA specific for heme oxygenase was actually increased in the liver of rats treated with any of those inducers. Also, the ability of liver polysomes to direct cell-free synthesis of heme oxygenase was apparently proportional to the activity of heme oxygenase in the liver from which polysomes were prepared. The heme oxygenase protein synthesized either in vivo or in vitro showed a molecular weight of 31,000 when examined by sodium dodecyl sulfate- polyacrylamide slab gel electrophoresis and fluorography. This value is essentially identical with the molecular weight of heme oxygenase purified from rat liver and indicates that a precursor form of heme oxygenase may not be involved in the heme oxygenase synthesis.
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