Cited by 117Receptor Mechanisms and SignalingNeuropeptides and Animal PhysiologyAlkaloids: synthesis and pharmacology

Differential binding properties of oripavines at cloned μ- and δ-opioid receptors

Lee, Katherine O, Akil, Huda, Woods, James H, Traynor, John R·1999·European Journal of Pharmacology

Abstract

This study examines the possibility that oripavine opioid receptor agonists bind equally to both high and low affinity states of the mu-opioid receptor. Studies were performed in C6 cells expressing mu- or delta-opioid receptors; high and low agonist affinity states of the receptors were defined by the absence and presence, respectively of Na+ ions and the GTP analog Gpp(NH)p. At the mu-opioid receptor dihydroetorphine and etorphine were full agonists, buprenorphine had moderate efficacy while diprenorphine was an antagonist. At the delta-opioid receptor, dihydroetorphine, etorphine, and diprenorphine had moderate efficacy while buprenorphine was an antagonist. The binding affinities of the oripavines at the mu-opioid receptor decreased only one to 2-fold in the presence of NaCl and Gpp(NH)p. In contrast, decreases in oripavine affinity at the delta-opioid receptor correlated with delta-opioid receptor efficacy. The ability of oripavine agonists to bind with high affinity to the low agonist affinity state of the nu-opioid receptor may explain the high potencies of these compounds in vivo.

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Registry

Crossref · 10.1016/s0014-2999(99)00460-4

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41 of 41 references verified0 citation errors · 0 not checkable

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  • Buprenorphine acts as a partial agonist at mu opioid receptors and an antagonist at kappa opioid receptors.

    “Buprenorphine, a mu opioid receptor partial agonist (274-276) and a kappa opioid receptor antagonist (277)”

    From A brain-centric model of suicidal behavior (2020) · cites this paper as [275]

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Authors
Lee, K. O., Akil, H., Woods, J. H., & Traynor, J. R.
Affiliations
University of Michigan (US)
Corresponding author
Traynor, John R
Venue
European Journal of Pharmacology
Publisher
Elsevier BV
Published
1999-08
Volume
378
Issue
3
Pages
323-330
ISSN
0014-2999 (ISSN-L)
OpenAlex
W2068950095
Cited by
117
References
41
Citations by year
2026: 2 · 2025: 2 · 2022: 1 · 2021: 1 · 2020: 6 · 2019: 5 · 2018: 3 · 2017: 5 · 2016: 5 · 2015: 3 · 2014: 7 · 2013: 7 · 2012: 2
FWCI
1.49
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01da002265-19)
  • National Institute on Drug Abuse (DA-00254, DA02265)
  • National Institute of General Medical Sciences (T32GM007767, GM-07767)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Alkaloids: synthesis and pharmacology
Keywords
oripavine, mu-opioid receptor, delta opioid receptor, receptor binding affinity, Gpp(NH)p, dihydroetorphine, etorphine, buprenorphine, diprenorphine, opioid agonists
MeSH terms
Analgesics, Opioid, Animals, Benzamides, Binding, Competitive, Buprenorphine, Cloning, Molecular, Diprenorphine, Dose-Response Relationship, Drug, Etorphine, Fentanyl, Morphine, Naloxone, Piperazines, Radioligand Assay, Sulfur Radioisotopes, Thebaine, Tritium, Tumor Cells, Cultured, Guanosine 5'-O-(3-Thiotriphosphate), Receptors, Opioid, mu, Receptors, Opioid, delta, Enkephalin, Ala(2)-MePhe(4)-Gly(5)-, Rats

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