Abstract
Repeated treatment with the psychostimulant amphetamine produces behavioral sensitization that may represent the neural adaptations underlying some features of psychosis and addiction in humans. In the present study we investigated the role of adenosine A2A receptors in psychostimulant-induced locomotor sensitization using an A2A receptor knockout (A2A KO) model. Daily treatment with amphetamine for 1 week resulted in an enhanced motor response on day 8 (by two-fold compared to that on day 1), and remained enhanced at day 24 upon rechallenge with amphetamine. By contrast, locomotor sensitization to daily amphetamine did not develop in A2A KO mice on day 8 or 24, and this absence was not the result of a nonspecific threshold effect. The absence of behavioral sensitization was selective for amphetamine since daily treatment with the D1 agonist SKF81297 (2.5 mg/kg) or the D2 agonist quinpirole (1.0 mg/kg) produced similar behavioral sensitization in both WT and A2A KO mice. Furthermore, coinjection of SKF81297 and quinpirole also resulted in indistinguishable locomotor sensitization in A2A KO and WT mice, suggesting normal D1 and D2 receptor responsiveness. Finally, at the cellular level A2A receptor inactivation abolished the increase in striatal dynorphin mRNA induced by repeated amphetamine administration. The selective absence of amphetamine-induced behavioral sensitization in A2A KO mice suggests a critical role of the A2A receptor in the development of psychostimulant-induced behavioral sensitization, and supports the pharmacological potential of A2A adenosinergic agents to modulate adaptive responses to repeated psychostimulant exposure.
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Acknowledgements
We thank Dr Anti Kalda for his assistance in statistical analysis of behavioral data. This work was supported by grants from US Public Health Service (DA07496, NS37403, DA13508) and grants from Scottish-Rite Schizophrenia Research Council and National Alliance for Research on Schizophrenia and Depression and by the Spanish Ministerio de Ciencia y Tecnología SAF200-122 and Ministerio del Interior, Plan Nacional Sobre Drogas (RM).
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Chen, JF., Moratalla, R., Yu, L. et al. Inactivation of Adenosine A2A Receptors Selectively Attenuates Amphetamine-Induced Behavioral Sensitization. Neuropsychopharmacol 28, 1086–1095 (2003). https://doi.org/10.1038/sj.npp.1300152
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DOI: https://doi.org/10.1038/sj.npp.1300152
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