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Indole Alkaloids as Biased Opioid Receptor Modulators

Oliver Grundmann1, Allison Henderson1

  • 1Department of Medicinal Chemistry, College of Pharmacy, University of Florida, Gainesville, FL 32611, USA.

Pharmaceuticals (Basel, Switzerland)
|March 28, 2026
PubMed

Insights

Indole alkaloids, like ibogaine and mitragynine, act as biased agonists on opioid receptors. This biased activation limits adverse effects such as respiratory depression, offering a promising avenue for safer pain management.

Area of Science:

  • Pharmacology
  • Neuroscience
  • Medicinal Chemistry

Background:

  • Opioid receptors are key targets for pain management.
  • Current opioid therapies cause adverse effects like tolerance, dependence, and respiratory depression.
  • Indole alkaloids offer a potential novel mechanism for analgesia.

Purpose of the Study:

  • To investigate the mechanism of action of indole alkaloids on opioid receptors.
  • To explore the potential of indole alkaloids in developing safer analgesics.

Main Methods:

  • Investigated the interaction of indole alkaloids (ibogaine, mitragynine) with μ-opioid receptors.
  • Assessed the recruitment of β-arrestin and G-protein signaling pathways.
  • Proposed a molecular mechanism for biased agonism based on structural interactions.

Main Results:

  • Indole alkaloids act as biased agonists at μ-opioid receptors.
  • They exhibit reduced β-arrestin recruitment compared to non-biased agonists.
  • This biased activation is linked to a distinct spatial orientation of receptor residues.

Conclusions:

  • Naturally occurring indole alkaloids mediate biased G-protein-coupled activation of opioid receptors.
  • Limited β-arrestin recruitment by indole alkaloids may reduce common opioid adverse effects.
  • Indole alkaloids represent a viable structural basis for developing novel biased opioid modulators with improved safety profiles.
Keywords:
beta-arrestinindolenatural productsopioidrespiratory depression

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