FEBS Lett. 2003 Apr 24;541(1-3):85-8.

Loss of activity of the selenoenzyme thioredoxin reductase causes induction of hepatic heme oxygenase-1.

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Division of Gastroenterology, Vanderbilt University School of Medicine, Nashville, TN 37232-2279, USA.

Abstract

The stress response enzyme heme oxygenase (HO)-1 is induced in livers of selenium-deficient rodents, probably to compensate for loss of certain selenoproteins. We sought to identify those selenoproteins. Selenium-replete mice with genetic deletion of selenoprotein P or glutathione peroxidase-1 did not have elevated hepatic HO activity, thus ruling out involvement of those selenoproteins in HO-1 induction by selenium deficiency. However, inhibition of thioredoxin reductase (TrxR) by a low dose of gold in the form of aurothioglucose led to induction of hepatic HO activity. Moreover, further induction by phenobarbital was observed. This HO-1 induction pattern is also seen in selenium-deficient mice. In the rat hepatoma cell line H4IIE, inhibition of TrxR by aurothioglucose or by 1-chloro-2,4-dinitrobenzene led to induction of HO-1. We conclude that loss of TrxR is responsible for the induction of HO-1 by selenium deficiency.

PMID:: 12706824; [PubMed - indexed for MEDLINE]

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