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      Pramipexole upregulates dopamine receptor D₂ and D₃ expression in rat striatum.

      Journal of pharmacological sciences
      Animals, Benzothiazoles, pharmacology, Blotting, Western, Corpus Striatum, drug effects, metabolism, Dopamine Agonists, Male, RNA, Messenger, genetics, Rats, Rats, Wistar, Real-Time Polymerase Chain Reaction, Receptors, Dopamine D2, Receptors, Dopamine D3, Up-Regulation

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          Abstract

          Randomized clinical trials have shown that pramipexole has an antidepressant effect in patients with Parkinson's disease. We investigated the comparative efficacy of pramipexole toward dopamine receptor D(2) and D(3) expression in rat brain. Groups of rats were treated subacutely with pramipexole (1 mg/kg), imipramine (10 mg/kg), or bromocriptine (5 mg/kg), with appropriate controls. Using real-time RT-PCR and immunoblotting, dopamine receptor D(2) and D(3) expression was up-regulated in the striatum following pramipexole treatment, while imipramine and bromocriptine had no significant effects. These findings support that pramipexole exerts additional therapeutic benefits such as decreasing depression by increasing dopamine receptor D(3) expression in the striatum.

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