Influence of adenosine receptor agonists and antagonists on amphetamine-induced stereotypy in rats.
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.
Poleszak
E
E
Department of Pharmacodynamics, Medical University School, Lublin, Poland.
Malec
D
D
D000661:Amphetamine / Q000494:pharmacology*; D000818:Animals; D000697:Central Nervous System Stimulants / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D058906:Purinergic P1 Receptor Agonists; D058915:Purinergic P1 Receptor Antagonists; D051381:Rats; D017208:Rats, Wistar; D043705:Receptor, Adenosine A2A; D013239:Stereotyped Behavior / Q000187:drug effects*
D000697:Central Nervous System Stimulants; D058906:Purinergic P1 Receptor Agonists; D058915:Purinergic P1 Receptor Antagonists; D043705:Receptor, Adenosine A2A; D000661:Amphetamine