Abstract
In the present work, adenosine agonists and antagonists on apomorphine-induced yawning in rats was investigated. Subcutaneous (SC) injection of apomorphine (0.02, 0.05 and 0.1 mg/kg) induced dose-dependent yawning behaviour in rats. Intracerebroventricular (ICV) administration of different doses of the drug (1, 3, 5 µg/rat) also caused a dose-related yawning. ICV administration of the adenosine receptor agonists 5-N-ethylcarboxami-doadenosine (NECA) and N6-cyclohexyladenosine (CHA) decreased apomorphine-induced yawning. The response induced by the adenosine agonists was reduced by 8-phenyladenosine (8-PT) pretreatment. The yawning induced by SC and ICV administration of apomorphine was decreased by ICV or IP injection of theophylline, respectively. It is concluded that at least A1 adenosine receptors may exert negative influence on the apomorphine-induced yawning. However, the exact mechanism(s) of adenosine receptors in this behaviour remain to be established.
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Zarrindast, M.R., Mohagheghi-Badi, M. & Fatehi, F. Effects of adenosine agents on apomorphine-induced yawning in rats. Psychopharmacology 122, 292–296 (1995). https://doi.org/10.1007/BF02246550
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DOI: https://doi.org/10.1007/BF02246550