The opioid receptor binding of dezocine, morphine, fentanyl, butorphanol and nalbuphine.

Article Details

Citation

Copy to clipboard

Chen JC, Smith ER, Cahill M, Cohen R, Fishman JB

The opioid receptor binding of dezocine, morphine, fentanyl, butorphanol and nalbuphine.

Life Sci. 1993;52(4):389-96.

PubMed ID

8093631 [ View in PubMed

]

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.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Nalbuphine	Delta-type opioid receptor	Protein	Humans	Yes	Antagonist	Details