The opioid receptor binding of dezocine, morphine, fentanyl, butorphanol and nalbuphine.
Life Sci
; 52(4): 389-96, 1993.
Article
em En
| MEDLINE
| ID: mdl-8093631
ABSTRACT
The ability of morphine, fentanyl, butorphanol, nalbuphine, and dezocine to compete with radiolabeled ligands for binding at the mu1, mu2, kappa1, and delta opioid receptors and the sigma receptor was characterized. In the absence of sodium, the potency of opioid receptor competition at each receptor site was found to be mu1-fentanyl > butorphanol > morphine > or = dezocine = nalbuphine; mu2-butorphanol > fentanyl > nalbuphine > morphine = dezocine; kappa1-butorphanol > nalbuphine >> morphine > or = dezocine > fentanyl; and delta-butorphanol > nalbuphine > or = dezocine > morphine > fentanyl. For all five compounds, competition at the sigma receptor was weak, with nalbuphine and dezocine having Kis of approximately 0.5 microM and the other opioids having Kis of greater than 1 microM. Since the presence of 100 mM NaCl during the competitive binding decreased the K(i), to varying degrees, of all five opioids at the mu1 and delta receptors and of some of the opioids at the mu2 and kappa1 receptors, the five compounds studied appear to differ in efficacy at the five receptor sites.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Receptores Opioides
/
Analgésicos Opioides
/
Antagonistas de Entorpecentes
Limite:
Animals
Idioma:
En
Revista:
Life Sci
Ano de publicação:
1993
Tipo de documento:
Article