NO-ERGIC SYSTEM IN RENAL TISSUE DURING BURN DISEASE

This research aimed at studying the state of the NO-ergic system in renal tissue of rats in modelled burn disease. Materials and methods. The series of experiments were carried out on pubescent male rats. Burn disease was modeled according to the Dovgansky method: the shaved and depilated area of a hind limb of test animals was dipped into hot water (t = 70 – 75 0С) under ethereal anesthesia for 7 sec. The size of the site damaged was determined depending on the area of ​​the skin, which averaged 12-15% of the animal’s body surface. The area of the skin damaged was calculated using the special Kochetygov’s table. Histological study of the damaged skin showed that under the above conditions there was a burn of IIIA-B degree that, according to modern conceptions, is considered as a standard model of the development of burn disease in the experiment. The rats were decapitated under ethereal anesthesia in 1, 7, 14, 21 days that in accordance with the modern ideas is commensurate with shock phases, early and late toxemia, and septicotoxemia. To evaluate the status of NO-ergic system, we assessed the NO-synthase activity and the nitrites content in the renal tissues. Results. Depending on the stage of burn disease, the NO-ergic system changed its characteristics. On the 1st day, at the stage of burn shock, the activity of NOS in renal tissues increased to its maximal level, while the peak increase in the content of nitrites was observed on the 7th day, at the stage of early toxemia. Conclusions. Thus, during the course of long-term burn disease, there is an increase in the activity of the NO-ergic system in kidney of rats. This can be explained by the enhancement of inflammatory processes in the kidneys under burn disease and by NO2– accumulation of in the renal tissues.