Cited by 149Adenosine and Purinergic SignalingReceptor Mechanisms and SignalingNeuroscience and Neuropharmacology Research

Adenosine A1-A2A receptor heteromers: New targets for caffeine in the brain

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Ferre, Sergi·2008·Frontiers in bioscience

Abstract

The contribution of blockade of adenosine A1 and A2A receptor to the psychostimulant effects of caffeine is still a matter of debate. When analyzing motor activity in rats, acutely administered caffeine shows a profile of a non-selective adenosine receptor antagonist, although with preferential A1 receptor antagonism. On the other hand, tolerance to the effects of A1 receptor blockade seems to be mostly responsible for the tolerance to the motor-activating effects of caffeine, while the residual motor-activating effects of caffeine in tolerant individuals seem to involve A2A receptor blockade. These behavioral studies correlate with in vivo microdialysis experiments that suggest that A1 receptor-mediated modulation of striatal glutamate release is involved in the psychostimulant effects of caffeine. Experiments in transfected cells demonstrate the ability of A1 receptors to heteromerize with A2A receptors and the A1-A2A receptor heteromer can be biochemically identified in the striatum, in striatal glutamatergic terminals. The striatal A1-A2A receptor heteromer provides a "concentration-dependent switch" mechanism by which low and high concentrations of synaptic adenosine produce the opposite effects on glutamate release. The analysis of the function of A1-A2A receptor heteromers during chronic treatment with caffeine gives new clues about the well-known phenomenon of tolerance to the psychostimulant effects of caffeine.

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  1. Ferré, S., Diamond, I., Goldberg, S. R., Yao, L., Hourani, S. M., Huang, Z. L., Urade, Y. & Kitchen, I. Adenosine A (2A) receptors in ventral striatum, hypothalamus and nociceptive circuitry Implications for drug addiction, sleep and pain. Prog Neurobiol (in press)
  2. Gerfen, C. R. Basal Ganglia. In: Paxinos, G. (Ed.), The Rat Nervous System. Elsevier Academic Press, Amsterdam, pp. 445-508 (2004)

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Authors
Ferre, S.
Venue
Frontiers in bioscience
Publisher
IMR Press
Published
2008
Volume
13
Issue
13
Pages
2391
ISSN
  • 1093-4715 (ISSN-L)
  • 1093-9946
OpenAlex
W2163203533
Cited by
149
References
49
Citations by year
2026: 1 · 2025: 3 · 2024: 4 · 2023: 9 · 2022: 8 · 2021: 9 · 2020: 4 · 2019: 5 · 2018: 10 · 2017: 7 · 2016: 3 · 2015: 8 · 2014: 6 · 2013: 10 · 2012: 16
FWCI
1.01
Type
journal article
Language
en
Open access
Locations
  • Frontiers in bioscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Drug Abuse
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Adenosine and Purinergic Signaling
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
adenosine A1 receptor, adenosine A2A receptor, receptor heteromers, caffeine, psychostimulant effects, caffeine tolerance, striatum, glutamate release, adenosine receptor antagonism, motor activity
MeSH terms
Adenosine, Central Nervous System Stimulants, Animals, Brain, Caffeine, Corpus Striatum, Humans, Models, Biological, Motor Activity, Dimerization, Receptor, Adenosine A1, Receptor, Adenosine A2A

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