Antinociception by intrathecal midazolam involves endogenous neurotransmitters acting at spinal cord delta opioid receptors.

Abstract:

:Intrathecal midazolam causes antinociception by combining with spinal cord benzodiazepine receptors. This effect is reversible with doses of naloxone, suggesting involvement of spinal kappa or delta but not mu opioid receptors. The antinociceptive effects of intrathecally administered drugs in the spinal cord were demonstrated by measurements of the electrical current threshold for avoidance behaviour in rats with chronically implanted lumbar intrathecal catheters. A comparison was made of suppression by two opioid selective antagonists (nor-binaltorphimine (kappa selective) and naltrindole (delta selective)) of spinal antinociception caused by equipotent doses of opioids selective for different receptor subtypes (U-50488H (kappa), DSLET and DSBULET (delta), fentanyl (mu)) and the benzodiazepine midazolam. Nor-binaltorphimine selectively suppressed the effects of U-50488H but not midazolam or fentanyl. However, the delta selective antagonist, naltrindole, caused dose-related suppression of antinociception produced by both delta opioid agonists and midazolam with the same ED50 (0.5 nmol). We conclude that intrathecal midazolam caused spinally mediated antinociception in rats by a mechanism involving delta opioid receptor activation.

journal_name

Br J Anaesth

authors

Goodchild CS,Guo Z,Musgreave A,Gent JP

doi

10.1093/bja/77.6.758

subject

Has Abstract

pub_date

1996-12-01 00:00:00

pages

758-63

issue

6

eissn

0007-0912

issn

1471-6771

pii

S0007-0912(17)42040-X

journal_volume

77

pub_type

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