Abstract
We found that (−)-SKF-10,047 blocks EEG and behavioral effects of morphine in the naive rat, precipitates withdrawal in morphine-dependent rats, produces physical dependence as evidenced by naloxone-induced withdrawal, and displaces [ 3H] dihydromorphine from brain homogenates. (+)-SKF- 10,047 did not produce dependence upon chronic treatment, and it did not displace [ 3H] dihydromorphine from brain homogenates. Such pharmacodynamic dissociation of SKF-10,047 effects suggests an association of sigma receptors with psychotogenic, but not opioid characteristics. The latter are most likely mediated by mu or kappa receptors.
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