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. 1979 Oct;76(10):5331–5335. doi: 10.1073/pnas.76.10.5331

Manganese and zinc blockade of enzyme induction: Studies with microsomal heme oxygenase

George S Drummond 1, Attallah Kappas 1
PMCID: PMC413136  PMID: 291950

Abstract

Heme oxygenase (decyclizing) [heme,hydrogen-donor:oxygen oxidoreductase (α-methene-oxidizing, hydroxylating), EC 1.14.99.3] is greatly induced in the kidney by the administration of nickel or tin. Manganese, when administered simultaneously with nickel or tin in an equimolar amount, substantially inhibited the induction of heme oxygenase. The extent of inhibition was 80% and 98%, respectively. In rats pretreated up to 8 hr with manganese, the level of induction of heme oxygenase by nickel or tin was markedly reduced in a time-dependent fashion. Manganese treatment after the inducing metal was relatively ineffective in preventing the induction of heme oxygenase. Manganese in vitro did not inhibit heme oxygenase in the microsomes isolated from either control or tin-induced rats and in vivo did not increase the rate of catabolism of the induced enzyme. Magnesium was unable to block nickel or tin induction of heme oxygenase. Zinc in equimolar amounts could also substantially reduce the extent of induction of renal heme oxygenase when administered simultaneously with nickel or tin. In addition, simultaneous zinc administration blocked to a considerable extent the induction of hepatic heme oxygenase by nickel, cobalt, or cadmium. These findings indicate the existence of metal—metal interactions that can greatly influence the regulatory mechanism for the induced synthesis of heme oxygenase, the rate-limiting enzyme in heme degradation.

Keywords: heme oxidation, metal—metal interaction

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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