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Related Experiment Videos

Adenosine: biphasic dose responses.

E J Calabrese1

  • 1Department of Environmental Health Sciences, School of Public Health and Health Sciences, University of Massachusetts, Amherst 01003, USA. edwardc@schoolph.umass.edu

Critical Reviews in Toxicology
|August 16, 2001
PubMed
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Adenosine and its analogs cause biphasic dose responses in many organs. Research clarified the roles of A-1 and A-2 receptors in these complex physiological effects.

Area of Science:

  • Pharmacology
  • Physiology
  • Neuroscience

Background:

  • Adenosine is a key signaling molecule in various physiological processes.
  • Biphasic dose responses, where a substance elicits different effects at different concentrations, are observed with adenosine.
  • Understanding these responses is crucial for therapeutic development.

Purpose of the Study:

  • To characterize the biphasic dose responses of adenosine and its analogs.
  • To elucidate the mechanistic roles of adenosine receptors (A-1 and A-2) in these responses.
  • To investigate the occurrence of these responses across multiple organ systems.

Main Methods:

  • Review and synthesis of existing mechanistic research on adenosine signaling.
  • Analysis of data on dose-response relationships in various biological systems.

Related Experiment Videos

  • Focus on the interactions between A-1 and A-2 adenosine receptors.

    • Main Results:

    • Biphasic dose responses to adenosine and analogs were confirmed in the respiratory tract, kidney, cardiovascular system, and brain.
    • Mechanistic studies revealed complex interactions between A-1 and A-2 receptors influencing these responses.
    • The maximum stimulatory response was generally low (≤2.5-fold), with highly variable concentration ranges (10- to 10(5)-fold).

    Conclusions:

    • Adenosine receptor interactions critically mediate biphasic dose responses across diverse physiological systems.
    • The variable concentration ranges highlight the complexity of adenosine's pharmacological profile.
    • Further research into adenosine receptor modulation may yield novel therapeutic strategies.