The Cysteine Dioxgenase Knockout Mouse: Altered Cysteine Metabolism in Nonhepatic Tissues Leads to Excess H2S/HS(-) Production and Evidence of Pancreatic and Lung Toxicity

Overview

Journal Antioxid Redox Signal

Specialty Endocrinology

Date 2013 Jan 29

PMID 23350603

Citations 37

Authors

Heather B Roman

Lawrence L Hirschberger

Jakub Krijt

Alessandro Valli

Viktor Kozich

Martha H Stipanuk

Affiliations

Soon will be listed here.

Abstract

Aims: To define the consequences of loss of cysteine dioxygenase (CDO) on cysteine metabolism at the tissue level, we determined levels of relevant metabolites and enzymes and evidence of H2S/HS(-) (gaseous hydrogen sulfide and its conjugate base) toxicity in liver, pancreas, kidney, and lung of CDO(-/-) mice that were fed either a taurine-free or taurine-supplemented diet.

Results: CDO(-/-) mice had low tissue and serum taurine and hypotaurine levels and high tissue levels of cysteine, consistent with the loss of CDO. CDO(-/-) mice had elevated urinary excretion of thiosulfate, high tissue and serum cystathionine and lanthionine levels, and evidence of inhibition and destabilization of cytochrome c oxidase, which is consistent with excess production of H2S/HS(-). Accumulation of cystathionine and lanthionine appeared to result from cystathionine β-synthase (CBS)-mediated cysteine desulfhydration. Very high levels of hypotaurine in pancreas of wild-type mice and very high levels of cystathionine and lanthionine in pancreas of CDO(-/-) mice were observed, suggesting a unique cysteine metabolism in the pancreas.

Innovation: The CDO(-/-) mouse model provides new insights into tissue-specific cysteine metabolism, particularly the role of pancreas in metabolism of excess cysteine by CBS-catalyzed reactions, and will be a useful model for studying the effects of excess endogenous production of H2S/HS(-).

Conclusion: The CDO(-/-) mouse clearly demonstrates that H2S/HS(-) production in tissues can exceed the capacity of the animal to oxidize sulfide to sulfate and demonstrates that pancreas and lung are more susceptible to toxicity from endogenous H2S/HS(-)production than are liver and kidney.

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