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Related Experiment Videos

Structure and function of A1 adenosine receptors.

J Linden1

  • 1Department of Internal Medicine Cardiology, University of Virginia, Charlottesville 22908.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|September 1, 1991
PubMed
Summary

The A1 adenosine receptor, a key purinergic receptor, is a glycoprotein involved in multiple cellular responses. It interacts with various G proteins and effectors, modulating cellular signaling pathways.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Cell Biology

Background:

  • The A1 adenosine receptor is the most studied member of the purinergic receptor family.
  • It is a 35- to 36-kDa glycoprotein found in the brain.
  • A1 receptors are distinguishable from A2 adenosine receptors using selective ligands.

Purpose of the Study:

  • To review the characteristics and signaling pathways of the A1 adenosine receptor.
  • To discuss the potential existence of A1 and A2 receptor subtypes.
  • To explore the diverse cellular effects mediated by A1 receptor activation.

Main Methods:

  • Review of structure-activity relationship data for selective ligands.
  • Analysis of G protein coupling and downstream effector pathways.

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  • Examination of adenosine's modulatory role in conjunction with other signaling molecules.

    • Main Results:

    • A1 receptors are monomeric glycoproteins.
    • Evidence suggests potential subtypes for both A1 and A2 receptors.
    • A1 receptor activation involves pertussis toxin-sensitive G proteins and affects multiple effectors like adenylate cyclase and ion channels.
    • Adenosine can enhance or inhibit inositol phosphate formation and act synergistically with other signaling molecules.

    Conclusions:

    • A1 adenosine receptors exhibit complex signaling, interacting with various G proteins and cellular effectors.
    • Adenosine's actions are multifaceted, potentially leading to simultaneous opposing effects within a single cell.
    • A1 receptor activation can alter the coupling of other receptors to their respective G proteins, highlighting its significant modulatory role.