Effects of eptazocine, a novel analgesic, on KCN-induced changes in the cerebral contents of glycolytic metabolites and high-energy phosphates in mice.

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Effects of eptazocine on cerebral metabolic changes due to a sublethal dose of KCN were investigated in mice. KCN (2 mg/kg, i.v.) induced a temporary loss of consciousness being moderated by eptazocine (1-10 mg/kg) in a dosedependent manner. The KCN injection decreased the contents of phosphocreatine (PCr), ATP and glucose and increased the contents of AMP and lactate, resulting in a 34% decrease in energy charge potential (ECP) and an increase in lactate/ pyruvate (L/P) ratio. Such changes were improved by eptazocine (10 mg/kg) and EKC (3 mg/kg), but not by pentazocine (10 mg/kg) and morphine (3 mg/kg), and the improving effect of eptazocine was completely inhibited by MR-2266 (3 mg/kg), a relatively selective opioid κ-receptor antagonist. On the other hand, eptazocine (3, 10 mg/kg) was found to increase the glucose content in normal mice, but not to give significant changes in the contents of glycolytic metabolites and high-energy phosphates. These results suggest that eptazocine may improve anoxic changes in cerebral energy metabolism.