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Related Experiment Videos

Conformationally restricted deltorphin analogues.

P W Schiller1, G Weltrowska, T M Nguyen

  • 1Laboratory of Chemical Biology and Peptide Research, Clinical Research Institute of Montreal, Quebec, Canada.

Journal of Medicinal Chemistry
|October 16, 1992
PubMed
Summary
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Researchers developed conformationally restricted deltorphin analogues, finding specific cyclic phenylalanine analogues enhance delta receptor selectivity. These novel compounds show promise as selective delta agonists and antagonists for potential therapeutic applications.

Area of Science:

  • Medicinal Chemistry
  • Neuroscience
  • Pharmacology

Background:

  • Deltorphins are peptide ligands targeting opioid receptors, particularly the delta (δ) opioid receptor.
  • Developing selective receptor ligands is crucial for understanding receptor function and for therapeutic drug design.
  • Conformational restriction is a strategy used to enhance ligand selectivity and potency.

Purpose of the Study:

  • To synthesize and characterize novel, conformationally restricted deltorphin analogues.
  • To evaluate the receptor binding affinity and selectivity of these analogues across mu (μ), delta (δ), and kappa (κ) opioid receptors.
  • To assess the functional activity (agonist/antagonist) of the synthesized compounds in relevant bioassays.

Main Methods:

  • Synthesis of deltorphin analogues incorporating cyclic phenylalanine analogues (e.g., Aic, Atc) or employing side chain-to-side chain cyclizations.

Related Experiment Videos

  • Radioligand binding assays to determine receptor affinity (Ki) for μ, δ, and κ opioid receptors.
  • In vitro bioassays using guinea pig ileum (GPI) and mouse vas deferens (MVD) to assess functional activity.

    • Main Results:

    • Analogues with cyclic phenylalanine substitutions (Aic, Atc) at position 3 retained high delta receptor selectivity as agonists.
    • A tetrahydroisoquinoline-3-carboxylic acid (Tic) substitution at position 2 yielded a partial delta agonist and a highly delta-selective antagonist (Ki μ/Ki δ = 502).
    • Side chain-to-side chain cyclized analogues generally exhibited non-selective binding profiles.

    Conclusions:

    • Conformational restriction via specific cyclic amino acid incorporation can yield highly delta-selective deltorphin agonists and antagonists.
    • The C-terminal tripeptide region significantly influences delta affinity and selectivity in agonist analogues.
    • A novel, potent, and selective delta opioid receptor antagonist was identified, offering a valuable tool for research.