Evaluation of selective actions of dopamine D-1 and D-2 receptor agonists and antagonists on opioid antinociception
| Autor: | K. F. Rooney, Robert David Edmund Sewell |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
Agonist
Male Narcotics medicine.medical_specialty Pyrrolidines Quinpirole medicine.drug_class Sufentanil Dopamine Agents Pharmacology Partial agonist Receptors Dopamine chemistry.chemical_compound Mice Internal medicine medicine Reaction Time Inverse agonist Animals Ergolines Injections Intraventricular SCH-23390 3 4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide (trans)-Isomer Nociceptors Receptor antagonist Enkephalin Leucine-2-Alanine Fentanyl Endocrinology chemistry Dopamine receptor 2 3 4 5-Tetrahydro-7 8-dihydroxy-1-phenyl-1H-3-benzazepine Sulpiride Endogenous agonist medicine.drug Enkephalin Leucine |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 0014-2999 |
| Popis: | The effect of the selective dopamine receptor agonists SKF 38393 (D-1) and quinpirole (D-2) on nociception was studied in the mouse tail immersion test. The D-1 receptor agonist induced mild hyperalgesia whereas the D-2 agonist produced antinociception. Pretreatment with either the selective D-1 receptor antagonist SCH 23390 or the D-2 receptor antagonist (-)-sulpiride converted the hyperalgesia produced by the D-1 agonist into an antinociceptive response whereas the effect of the D-2 receptor agonist was significantly antagonised. The antinociceptive response of selective opioid agonists was also studied in combination with selective dopamine receptor agonists and antagonists. Sufentanil (mu-opioid) antinociception was enhanced in animals pretreated with (-)-sulpiride but not SCH 23390. In animals co-administered sufentanil with SKF 38393 there was a reduced antinociceptive effect whilst quinpirole enhanced the action of sufentanil. Likewise, antinociception induced by the kappa-opioid agonist U50,488H was unaltered in animals pretreated with SCH 23390, increased by (-)-sulpiride, and reduced by SKF 38393. delta-Opioid antinociception induced by [D-Ala2,D-Leu5]enkephaline remained unmodified following pretreatment with either (-)-sulpiride or SCH 23390 but was potentiated in animals which received both the delta-agonist and the D-2 receptor agonist. It is concluded that D-2 receptor agonists not only have intrinsic antinociceptive activity, but can also potentiate opioid-induced antinociception. Similarly, dopamine D-2 receptor antagonists appear to potentiate opioid-induced antinociception in this nociceptive model. |
| Databáze: | OpenAIRE |
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