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Hydrogen sulfide (H 2 S) is known to act protectively during renal ischemia/reperfusion injury (IRI). However, the role of the endogenous H 2 S in acute kidney injury (AKI) is largely unclear. Here, we analyzed the role of cystathionine gamma-lyase (CTH) in acute renal IRI using CTH-deficient ( Cth  −/− ) mice whose renal H 2 S levels were approximately 50% of control (wild-type) mice. Although levels of serum creatinine and renal expression of AKI marker proteins were equivalent between  Cth  −/−  and control mice, histological analysis revealed that IRI caused less renal tubular damage in  Cth  −/−  mice. Flow cytometric analysis revealed that renal population of infiltrated granulocytes/macrophages was equivalent in these mice. However, renal expression levels of certain inflammatory cytokines/adhesion molecules believed to play a role in IRI were found to be lower after IRI only in  Cth  −/−  mice. Our results indicate that the systemic CTH loss does not deteriorate but rather ameliorates the immediate AKI outcome probably due to reduced inflammatory responses in the kidney. The renal expression of CTH and other H 2 S-producing enzymes was markedly suppressed after IRI, which could be an integrated adaptive response for renal cell protection.

Role of Cystathionine Gamma-Lyase in Immediate Renal Impairment and Inflammatory Response in Acute Ischemic Kidney Injury