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Adenosine receptors: expression, function and regulation.

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Adenosine receptors (ARs) are crucial GPCRs mediating adenosine's effects. This review details their biochemical traits, signaling, regulation, and roles in oxidative stress, cancer, and hearing protection.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Adenosine receptors (ARs) are G protein-coupled receptors (GPCRs) that mediate adenosine's physiological effects.
  • Four AR subtypes have been identified with distinct tissue localization and signaling pathways.

Purpose of the Study:

  • To review the biochemical characteristics and signaling cascades of each AR subtype.
  • To provide insight into AR regulation by agonists and their role in oxidative stress.
  • To examine AR oligomerization and their involvement in physiological and pathological processes.

Main Methods:

  • Literature review of biochemical and signaling studies on adenosine receptors.
  • Analysis of AR regulation mechanisms, including transcription factor involvement (e.g., NF-κB).
  • Discussion of recent findings on AR homo- and heterodimerization.

Main Results:

  • Detailed description of the biochemical properties and signaling pathways for each of the four AR subtypes.
  • Identification of ARs as sensors of cellular oxidative stress, influencing their expression via transcription factors.
  • Evidence for AR oligomerization into homo- and heterodimers.

Conclusions:

  • Adenosine receptors exhibit diverse biochemical characteristics and signaling mechanisms.
  • ARs play significant roles in cellular oxidative stress responses, cancer development, and hearing protection.
  • AR oligomerization is a key aspect of their function and regulation.