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. 1976 Jan 15;154(1):125–131. doi: 10.1042/bj1540125

Studies on the mechanism of induction of haem oxygenase by cobalt and other metal ions.

M D Maines, A Kappas
PMCID: PMC1172683  PMID: 819007

Abstract

Cobalt ions (Co2+) are potent inducers of haem oxygenase in liver and inhibit microsomal drug oxidation probably by depleting microsomal haem and cytochrome P-450. Complexing of Co2+ ions with cysteine or glutathione (GSH) blocked ability of the former to induce haem oxygenase. When hepatic GSH content was depleted by treatment of animals with diethyl maleate, the inducing effect of Co2+ on haem oxygenase was significantly augmented. Other metal ions such as Cr2+, Mn2+, Fe2+, Fe3+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and Pb2+ were also capable of inducing haem oxygenase and depleting microsomal haem and cytochrome P-450. None of these metal ions had a stimulatory effect on hepatic haem oxidation activity in vitro. It is suggested that the inducing action of Co2+ and other metal ions on microsomal haem oxygenase involves either the covalent binding of the metal ions to some cellular component concerned directly with regulating haem oxygenase or non-specific complex-formation by the metal ions, which depletes some regulatory system in liver cells of an essential component involved in controlling synthesis or activity of the enzyme.

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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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