Abstract

The antinociception induced by supraspinally administered β-endorphin is mediated by the release of Met-enkephalin and subsequent stimulation of δ-opioid receptors from the spinal cord in mice. Repeated intrathecal administration of an antisense oligodeoxynucleotide against δ-opioid receptors selectively attenuated i.c.v. administered β-endorphin-induced antinociception without any effect on the antinociception induced by μ-opioid receptor agonists, morphine and DAMGO, or κ-opioid receptor agonists, U50,488H. A random sequence oligodeoxynucleotide was inactive against β-endorphin-induced antinociception. The study confirms previous findings that the antinociception induced by β-endorphin is mediated by the stimulation of the δ-opioid receptors in the spinal cord.

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