INTERLEUKIN-1 TREATMENT INCREASES NEUTROPHILS BUT NOT ANTIOXIDANT ENZYME-ACTIVITY OR RESISTANCE TO ISCHEMIA-REPERFUSION INJURY IN RAT KIDNEYS

Hearts from rats treated with interleukin-1 (IL-1) intraperitoneally d eveloped a rapid (6 h after IL-1), transient increase in neutrophils, tissue hydrogen peroxide (H2O2), and oxidized glutathione (GSSG) level s, and a subsequent (36 h after IL-1) increase in myocardial glucose-6 -phosphate dehydrogenase (G6PD) activity and tolerance to ischemia-rep erfusion. In the present investigation, we found that rats treated sim ilarly with IL-1 had increased numbers of neutrophils in their kidneys , which were comparable to myocardial neutrophil increases, but did no t develop increased renal tissue H2O2 or GSSG levels acutely (6 h afte r IL-1) or increased G6PD activity or resistance to ischemia-reperfusi on injury later (36 h after IL-1). Our findings indicate that IL-1 tre atment increased neutrophil accumulation in rat kidneys but did not in crease oxidative stress, antioxidant enzyme activity, or resistance to ischemia-reperfusion injury. We conclude that organ-to-organ differen ces exist with respect to IL-1-induced tolerance.