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Opioid Receptors: Overview01:22

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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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Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
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Cyclization in opioid peptides.

Justyna Piekielna1, Renata Perlikowska, Katarzyna Gach

  • 1Department of Biomolecular Chemistry, Medical University of Lodz, Lodz, Poland.

Current Drug Targets
|April 30, 2013
PubMed
Summary
This summary is machine-generated.

Cyclic opioid peptide analogs offer improved pain relief by enhancing receptor specificity and stability. This review details synthesis strategies and evaluates their analgesic potential compared to linear peptides.

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Area of Science:

  • Medicinal Chemistry
  • Pharmacology
  • Neuroscience

Background:

  • Endogenous opioid peptides are key pain modulators but face challenges as therapeutics.
  • Poor receptor specificity, metabolic instability, and limited brain penetration hinder natural opioid peptide efficacy.
  • Synthetic opioid analogs aim to overcome these limitations for improved pain management.

Purpose of the Study:

  • To review strategies for synthesizing cyclic opioid peptide analogs.
  • To compare the pharmacological properties and analgesic activities of cyclic versus linear opioid peptides.
  • To highlight the therapeutic potential of cyclized opioid peptides for pain treatment.

Main Methods:

  • Review of synthetic strategies for creating cyclic opioid peptide analogs.
  • Analysis of various bridging bond types (amide, amine, sulfur-containing, etc.).
  • Comparison of opioid receptor affinities and in vivo analgesic activities.

Main Results:

  • Cyclization enhances metabolic stability, lipophilicity, and receptor specificity of opioid peptides.
  • Various synthetic approaches yield cyclic analogs with improved pharmacological profiles.
  • Cyclic analogs demonstrate promising analgesic effects in preclinical pain models.

Conclusions:

  • Cyclization is a powerful strategy to develop improved opioid peptide therapeutics.
  • Cyclic opioid analogs offer enhanced efficacy and reduced side effects for pain management.
  • Further research into cyclic opioid peptides holds significant therapeutic promise.