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Preconditioning With Oxygen Attenuates Rat Renal Ischemia–Reperfusion Injury

Authors
Journal
Journal of Surgical Research
0022-4804
Publisher
Elsevier
Publication Date
Volume
146
Issue
2
Identifiers
DOI: 10.1016/j.jss.2007.04.034
Keywords
  • Vascular
Disciplines
  • Biology
  • Medicine

Abstract

Background Short time pretreatment with oxygen is reported to be protective against subsequent ischemia-reperfusion (IR) injury of heart and spinal cord in some animal models. The purpose of this study was to investigate the effects of pre-exposure to hyperoxic environment on rat renal IR injury for the first time. Materials and methods The effects of 1 h/d pretreatment with oxygen (≥95%) for 5 days on a right nephrectomized rat model of renal IR injury was investigated by comparing creatinine clearance, fractional excretion of sodium, plasma creatinine, blood urea nitrogen, and histological injury scores among three groups: IR (40 min ischemia–24 h reperfusion), sham (no IR), and hyperoxia (5 days intermittent pretreatment with oxygen + IR). Results Intermittent pretreatment with oxygen resulted in significant improvement of creatine clearance and fractional excretion of sodium ( P ≤ 0.05). Plasma creatinine above 175 μmol/L or blood urea nitrogen beyond 26 mmol/L was significantly less frequent in hyperoxia than IR group ( P < 0.05). Jablonski histological injury score was also significantly lower in hyperoxia compared to IR group ( P < 0.05) and hyperoxic preconditioning significantly reduced the frequency of massive proximal tubular necrosis (12.5% versus 75%, P < 0.05). Conclusions The present findings demonstrate that intermittent pre-exposure to hyperoxic environment can reduce subsequent renal IR injury.

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