Summary
α-MSH (0.1, 1, 10 μg) was administered intracerebroventricularly and its action on pain sensitivity was investigated by the hot-plate method in mice. α-MSH produced dose-dependent analgesia and this analgesic effect was prevented by naloxone (1 mg/kg, s.c.). It is possible that α-MSH may play a role in the mechanism of pain through endogeneous opioid systems.
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