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Related Experiment Videos

Functional characterization of three adenosine receptor types

M F Gurden1, J Coates, F Ellis

  • 1Pharmacology Division, Glaxo Group Research, Ware, Hertfordshire.

British Journal of Pharmacology
|July 1, 1993
PubMed
Summary

This study classified adenosine receptors, identifying A1 and two A2 subtypes (A2a and A2b) based on agonist potency in various tissues. These findings advance our understanding of adenosine receptor pharmacology.

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Biochemistry

Background:

  • Adenosine receptors play crucial roles in physiological processes.
  • Existing classification includes A1 and A2 subtypes, but further differentiation is needed.

Purpose of the Study:

  • To classify adenosine receptors into A1 and A2 subtypes.
  • To investigate potential subtypes within the A2 class using various tissues and agonists.

Main Methods:

  • Utilized a range of isolated tissues and cell types, including rat adipocytes and atria, guinea-pig ileum and aorta, dog coronary artery, and human platelets and neutrophils.
  • Employed specific adenosine receptor agonists such as N-phenylisopropyladenosine (PIA), N-cyclopentyladenosine (CPA), and novel compounds like GR79236, metrifudil, CV1808, CGS21680, and NECA.

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  • Determined rank orders of agonist potency for each tissue preparation to differentiate receptor subtypes.

    • Main Results:

    • A single rank order of agonist potency was observed for tissues previously identified as containing A1 receptors.
    • Two distinct rank orders of agonist potency were identified in tissues previously classified as containing A2 receptors.
    • The receptor in dog coronary artery, human neutrophils, and platelets exhibited a specific potency order, suggesting the A2a subtype.
    • The receptor in guinea-pig aorta showed a different potency order, indicating a potential A2b subtype.

    Conclusions:

    • The findings support the existence of three adenosine receptor types: A1 and two distinct A2 subtypes.
    • The data suggest the presence of A2a and A2b adenosine receptor subtypes.
    • This classification provides a more refined understanding of adenosine receptor pharmacology.