Anti-oxidative response of carbonic anhydrase III in skeletal muscle

IUBMB Life
Un-Jin ZimmermanRobert Forster

Abstract

We propose that carbonic anhydrase III (CAIII) functions as an anti-oxidant agent in skeletal muscle. To explore this hypothesis, we analyzed the gene expression profile of skeletal muscle in mice deficient in CAIII gene utilizing the murine genome U74Av2 set microarray. Pairwise comparison between CAIII knockout mice and their wild-type littermates revealed that more than 500 of 12,000 genes in the array showed an altered level of transcription. Of particular note were transcriptional alterations among genes associated with the glutathione redox cycle, suggesting a possible involvement of CAIII in the glutathione-mediated anti-oxidant activity. We therefore investigated S-glutathiolation and irreversible oxidation of the 2 reactive sulfhyryls of CAIII in skeletal muscle under oxidative stresses of ischemia, or exhaustive exercise. Analysis by isoelectric focusing followed by Western blot revealed that the two sulfhydryls were differentially and progressively oxidized. Brief ischemia of 10-20 min provoked partial (one of the suflhydryls) modification of CAIII via reversible S-glutathiolation. Protracted 60 min ischemia yielded equal amounts of both partially and completely (both sulfhydryls) modified CAIII due to irreversible o...Continue Reading

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