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Copyright © 2000 by Institute of Pharmacology Polish Academy of Sciences |
Pol. J. Pharmacol., 2000, 52, 423-429 ISSN 1230-6002 |
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Influence of adenosine receptor agonists and antagonists on amphetamine-induced stereotypy.
E. POLESZAK, D. MALEC. Pol. J. Pharmacol., 2000, 52, 426-429. The influence of adenosine receptor agonists and antagonists on amphetamine-induced stereotypy was examined in male Wistar rats. Adenosine A2 receptor agonists CGS 21680 (0.5–2 mg/kg ip) and a non-specific A2/A1 receptor agonist NECA (0.05–0.1 mg/kg ip) attenuated in a dose dependent manner amphetamine-induced stereotypy (2 mg/kg sc). CPA as specific agonist of adenosine A1 receptors counteracted this stereotypy, but only in a narrow range of doses (0.1–0.2 mg/kg ip). Adenosine A2A receptor antagonist, DMPX (3 and 6 mg/kg ip) potentiated stereotypy induced by either subthreshold dose of amphetamine 0.5 mg/kg or a high one 2 mg/kg. A non-selective adenosine receptor antagonist, caffeine (10 mg/kg ip) potentiated effect of low dose of amphetamine, but only in a dose of 20 mg/kg ip increased stereotypy induced by 2 mg/kg ip of amphetamine. A selective adenosine A1 receptor antagonist CPT (1 and 3 mg/kg ip) was ineffective in reversing amphetamine-induced stereotypy. These results confirm the existence of adenosine-dopamine interactions in the brain, and the suggestions that A2 adenosine receptor agonists may have antipsychotic properties. Key words: amphetamine, adenosine, stereotypy, rats |
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