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The Structure-Function Relationships of Classical Cannabinoids: CB1/CB2 Modulation.

Eric W Bow1, John M Rimoldi1

  • 1Department of BioMolecular Sciences, Division of Medicinal Chemistry, School of Pharmacy, University of Mississippi, University, MS, USA.

Perspectives in Medicinal Chemistry
|July 12, 2016
PubMed
Summary

Cannabinoids, like THC, interact with cannabinoid receptors (CB1/CB2). Understanding their structure-activity relationships guides the development of new modulators with improved properties.

Keywords:
Cannabis sativacannabidiolclassical cannabinoidsphytocannabinoidstetrahydrocannabinol

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Area of Science:

  • Pharmacology
  • Medicinal Chemistry
  • Organic Chemistry

Background:

  • Cannabinoids are terpenophenolic metabolites from Cannabis sativa, notably (-)-Δ(9)-tetrahydrocannabinol (THC).
  • THC and related compounds exert pharmacological effects via cannabinoid receptor (CB1/CB2) signaling.
  • Synthetic analogs have been crucial for understanding receptor interactions and structure-activity relationships (SAR).

Purpose of the Study:

  • To review the structure-activity relationship of classical cannabinoids.
  • To emphasize critical structural regions influencing CB1/CB2 receptor binding and activity.
  • To highlight how SAR studies inform the development of novel cannabinoid modulators.

Main Methods:

  • Literature review of cumulative SAR studies on classical cannabinoids.
  • Analysis of structural modifications in five key regions: C3 side chain, phenolic hydroxyl, aromatic A-ring, pyran B-ring, and cyclohexenyl C-ring.
  • Examination of how these modifications affect potency and selectivity for CB1 and CB2 receptors.

Main Results:

  • Defined critical structural elements for cannabinoid potency and selectivity at CB1 and CB2 receptors.
  • Established SAR for classical cannabinoid analogs.
  • Identified key structural features that enable the development of improved cannabinoid modulators.

Conclusions:

  • SAR studies are essential for understanding cannabinoid pharmacology.
  • Knowledge of SAR has led to the discovery of nonclassical cannabinoid modulators.
  • These newer modulators offer enhanced physicochemical and pharmacological profiles compared to classical cannabinoids.