Abstract
Certain members of the peroxiredoxin (Prx) family undergo inactivation through hyperoxidation of the catalytic cysteine to sulfinic acid during catalysis and are reactivated by sulfiredoxin; however, the physiological significance of this reversible regulatory process is unclear. We now show that PrxIII in mouse adrenal cortex is inactivated by H2O2 produced by cytochrome P450 enzymes during corticosterone production stimulated by adrenocorticotropic hormone. Inactivation of PrxIII triggers a sequence of events including accumulation of H2O2, activation of p38 mitogen-activated protein kinase, suppression of steroidogenic acute regulatory protein synthesis, and inhibition of steroidogenesis. Interestingly, levels of inactivated PrxIII, activated p38, and sulfiredoxin display circadian oscillations. Steroidogenic tissue-specific ablation of sulfiredoxin in mice resulted in the persistent accumulation of inactive PrxIII and suppression of the adrenal circadian rhythm of corticosterone production. The coupling of CYP11B1 activity to PrxIII inactivation provides a feedback regulatory mechanism for steroidogenesis that functions independently of the hypothalamic-pituitary-adrenal axis.
Original language | English |
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Pages (from-to) | 584-594 |
Number of pages | 11 |
Journal | Molecular Cell |
Volume | 46 |
Issue number | 5 |
DOIs | |
State | Published - 8 Jun 2012 |
Bibliographical note
Funding Information:This study was supported by grants from the Korean Science and Engineering Foundation (National Honor Scientist program grant 2006-05106 and Bio R&D program grant M10642040001-07N4204-00110 to S.G.R.).