INCREASED SENSITIVITY TO BILATERAL-NEPHRECTOMY IN RAT CAUSED BY ENDOTOXEMIA

In this study the possibility that the kidneys play a role in the remo val of endotoxin from the blood was examined. This was carried out by an IP injection of endotoxin (at a dosage of 1 mg/100 gr) to rats that had undergone bilateral nephrectomy, and examining the times of death following various treatments. Furthermore, the rats underwent treat m ent for endotoxin tolerance or received treatment with the antioxidant s superoxide dismutase (SOD) and natural antioxidant (NAG) or were inj ected with an inhibitor of the enzyme NOS (N(G)methyl 1-arginine 1-NMA ). The endotoxin concentration in the plasma was also measured. The re sults of this study indicate the rats were more sensitive to bilateral nephrectomy in the presence of endotoxin. This increased sensitivity in the binephrectomized rat decreases following treatment inducing tol erance to endotoxin, or following treatment with an antioxidant or wit h the inhibitor of NOS. A possible explanation for the increased sensi tivity following endotoxin injection is that it apparently results fro m an increased concentration of endotoxin in the blood due to the impo ssibility of removing the endotoxin via the kidneys. Therefore, endoto xin tolerance or abolishing the potential injuries that may be caused by endotoxin negate the sensitivity in the binephrectomized rats injec ted with endotoxin.