Midazolam attenuates the antinociception induced by d-serine or morphine at the supraspinal level in rats.
Eur J Pharmacol
; 586(1-3): 139-44, 2008 May 31.
Article
em En
| MEDLINE
| ID: mdl-18384770
ABSTRACT
Our recent study has shown that the intracerebroventricular administration of d-serine, an endogenous and selective agonist for the glycine site of the N-methyl-d-aspartate receptor, alone or in combination with morphine, leads to the potentiation of antinociception on the tail-flick response. Although there is a variety of information concerning the effects of benzodiazepines on opioid-induced antinociception, little is known about the effect of benzodiazepines on the N-methyl-d-aspartate receptor agonist-induced antinociception. To clarify the analgesic interactions among the benzodiazepine/GABA(A), N-methyl-d-aspartate and opioid receptors at the supraspinal level, we investigated the effects of intracerebroventricular administration of midazolam, a benzodiazepine receptor agonist, on the antinociception evoked by the intracerebroventricular application of d-serine or morphine. The intracerebroventricular administration of midazolam alone produced hyperalgesia on the tail-flick response in a benzodiazepine receptor antagonist, flumazenil-reversible manner. The antinociception induced by the intracerebroventricular application of d-serine or morphine was attenuated by the intracerebroventricular administration of midazolam. In addition, this inhibitory effect of midazolam on the antinociception of d-serine or morphine was antagonized by the intracerebroventricular administration of flumazenil. Together with the facts that d-serine and midazolam act as selective agonists for the glycine site of the N-methyl-d-aspartate receptor and benzodiazepine/GABA(A) receptor, respectively, these observations suggest a functional interaction between the NMDA and benzodiazepine/GABA(A) receptors in the regulation of antinociception at the supraspinal level.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Serina
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Medula Espinal
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Midazolam
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Analgésicos
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Analgésicos Opioides
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Hipnóticos e Sedativos
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Morfina
Limite:
Animals
Idioma:
En
Revista:
Eur J Pharmacol
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Japão