Journal of Molecular Neuroscience

, Volume 27, Issue 2, pp 185–194 | Cite as

Inhibition of ligand binding to g protein-coupled receptors by arachidonic acid

  • Elizabeth Z. Bordayo
  • John R. Fawcett
  • Sarita Lagalwar
  • Aleta L. Svitak
  • William H. FreyEmail author
Original Article


Arachidonic acid (AA), released in response to muscarinic acetylcholine receptor (mAChR) stimulation, previously has been reported to function as a reversible feedback inhibitor of the mAChR. To determine if the effects of AA on binding to the mAChR are subtype specific and whether AA inhibits ligand binding to other G protein-coupled receptors (GPCRs), the effects of AA on ligand binding to the mAChR subtypes (M1, M2, M3, M4, and M5) and to the μ-opioid receptor, β2-adrenergic receptor (β2-AR), 5-hydroxytryptamine receptor (5-HTR), and nicotinic receptors were examined. AA was found to inhibit ligand binding to all mAChR subtypes, to the β2-AR, the 5-HTR, and to the μ-opioid receptor. However, AA does not inhibit ligand binding to the nicotinic receptor, even at high concentrations of AA. Thus, AA inhibits several types of GPCRs, with 50% inhibition occurring at 3–25 µM, whereas the nicotinic receptor, a non-GPCR, remains unaffected. Further research is needed to determine the mechanism by which AA inhibits GPCR function.

Index Entries

Arachidonic acid G protein-coupled receptors feedback inhibition muscarinic receptor fatty acids 


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Copyright information

© Humana Press Inc 2005

Authors and Affiliations

  • Elizabeth Z. Bordayo
    • 1
  • John R. Fawcett
    • 1
  • Sarita Lagalwar
    • 1
  • Aleta L. Svitak
    • 1
  • William H. Frey
    • 1
    Email author
  1. 1.Alzheimer’s Research CenterHealthPartners Research FoundationSaint Paul

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