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Caffeine induces locomotor activation by its ability to block adenosine receptors. Caffeine is metabolized to several methylxanthines, with paraxanthine being the main metabolite in humans. In this study we show that in rats paraxanthine has a stronger locomotor activating effect than caffeine or the two other main metabolites of caffeine, theophylline and theobromine. As previously described for...
The striatum contains a high density of histamine H 3 receptors, but their role in striatal function is poorly understood. Previous studies have demonstrated antagonistic interactions between striatal H 3 and dopamine D 1 receptors at the biochemical level, while contradictory results have been reported about interactions between striatal H 3 and dopamine D 2 ...
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