Abstract
The effects of intrathecally (i.t.) administered naloxone or glibenclamide, a blocker of adenosine triphosphate-sensitive potassium (K ATP) channels, on the antinociception produced by i.t. apomorphine were observed by an integrated electromyogram measurement of hindlimb flexor reflex in lightly pentobarbital-anesthetized rats. The results showed that i.t. apomorphine produced a significant and dose-dependent antinociception and that the antinociception produced by i.t. apomorphine could be blocked dose dependently by i.t. naloxone or glibenclamide. The results suggest that endogenous opioids and ATP-sensitive potassium channels might be sequentially involved in the mediation of apomorphine-induced antinociception at the spinal level.
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