[The role of the endogenous opioid system in the mechanisms of the development of early postradiation autonomic and behavioral disorders].

In the experiments with rats and dogs it was shown that irradiation within the dose range of 50-100 Gy is accompanied by the increasing of enkephaline content in various brain structures and beta-endorphine level in blood plasma. The blocking of the opiate receptors naloxone promotes the decrease of post-radiation vomiting in dogs, gastrostasis and hypokinesia in rats. That supports the participation of endogenous opioid system in the primary clinical reaction response to irradiation.