Adaptations in adenosine signaling in drug dependence: therapeutic implications

Critical Reviews in Neurobiology
Stephen P Hack, MacDonald J Christie

Abstract

Adenosine is an important endogenous purine neuromodulator in the central nervous system that modulates many important cellular processes in neurons. The physiological effects of adenosine are transduced through four pharmacologically classified receptor types i.e., A1, A2A, A2B and A3. All adenosine receptors are G-protein coupled receptors (GPCR) of the type 1 variety. Adaptations in adenosine signaling have been implicated in a wide range of pathophysiological processes, such as epilepsies, sleep disorders, pain, and drug addictions. Knowledge relating to the etiology of addictive processes is far from complete, and as a result the therapeutic options to deal with drug dependence issues are limited. Drugs of abuse mediate their effects through many distinct cellular effectors, such as neurotransmitter transporters, ion channels, and receptor proteins. However, a unifying feature of the major drugs of abuse-i.e., opiates, cocaine, and alcohol-is that they all directly or indirectly modulate adenosine signaling in neurons. Agents targeting adenosine receptors may therefore offer novel avenues for the development of therapies to manage or treat addictions. A consistent cellular adaptation to long-term drug use is the up- or dow...Continue Reading

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