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Related Concept Videos

Opioid Receptors: Overview01:22

Opioid Receptors: Overview

Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2, D-Pen5]-enkephalin or DPDPE for...
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Opioid receptor subtypes: fact or artifact?

N Dietis1, D J Rowbotham, D G Lambert

  • 1Department of Cardiovascular Sciences (Pharmacology and Therapeutics Group), Division of Anaesthesia, Critical Care and Pain Management, University of Leicester, Leicester Royal Infirmary, Leicester LE1 5WW, UK.

British Journal of Anaesthesia
|May 27, 2011
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Summary

Pharmacological evidence suggests opioid receptor subtypes, but molecular data challenges this. Future research should explore alternative splicing, dimerization, or signaling interactions to reconcile these findings.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Neuroscience

Background:

  • Extensive pharmacological data suggests multiple opioid receptor subtypes (e.g., µ1, µ2).
  • These proposed subtypes were linked to specific functions like analgesia and respiratory depression.
  • However, molecular cloning and knockout studies identified only four primary opioid receptors (MOP, DOP, KOP, NOP).

Purpose of the Study:

  • To reconcile the wealth of pharmacological data on opioid receptor subtypes with current molecular findings.
  • To investigate potential molecular mechanisms explaining observed pharmacological variations.
  • To guide future opioid research by proposing explanations for subtype discrepancies.

Main Methods:

  • Review of existing pharmacological evidence on opioid receptor subtypes.
  • Analysis of molecular data from receptor cloning and knockout animal models.
  • Hypothesizing molecular mechanisms that could explain pharmacological observations.

Main Results:

  • Knockout studies of primary opioid receptors (MOP, DOP, KOP, NOP) do not support the existence of distinct pharmacological subtypes.
  • Loss of a single primary receptor gene in knockout models eliminates all associated functions (e.g., MOP knockout abolishes analgesia and respiratory depression).
  • The pharmacological data may be explained by mechanisms other than distinct receptor subtypes.

Conclusions:

  • Further sub-classification of primary opioid receptors (MOP, DOP, KOP, NOP) is not supported by molecular evidence.
  • Observed pharmacological variations may arise from alternative splicing, receptor dimerization, or interactions with other signaling molecules.
  • Reconciling pharmacological and molecular data presents a significant challenge for future opioid research.