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• W2021528349 endingPage "363" @default.
• W2021528349 startingPage "353" @default.
• W2021528349 abstract "The nigrostriatal dopaminergic neurons of the substantia nigra pars compacta (SNc) and the nondopaminergic neurons of the substantia nigra pars reticulata (SNr) receive a dense synaptic input from the serotonergic neurons of the raphe nuclei. To assess whether serotonin [5-hydroxytryptamine (5-HT)] spontaneously released at the substantia nigra could modulate motor activity, the 5-HT reuptake inhibitors (SRIs), duloxetine (6-12 nmol) and clomipramine (12 nmol), were unilaterally microinjected either into the SNc or the SNr of freely moving rats, and the circling behavior was counted with an automated rotometer. In the SNc, the main effect of the SRIs was a contraversive circling behavior that was not observed when applied at distances > or = 0.2 mm above the SNc. The circling induced by clomipramine was blocked by microinjection of haloperidol (53 nmol) into the ipsilateral neostriatum, suggesting that the circling elicited by microinjection of the SRIs into the SNc depends on an intact striatal dopaminergic transmission. Microinjection of 5-HT (21 nmol) only produced a significant contraversive circling response when it was coinjected with the SRIs. Pretreatment with methysergide (1 mg/kg ip), a nonselective 5-HT(2) antagonist, did not block the circling elicited by microinjection of clomipramine into the SNc, either alone or in combination with 5-HT. However, microinjection of the 5-HT(2) antagonist mianserin (2 nmol) into the SNc partially inhibited the circling induced by duloxetine (6 nmol), alone or coinjected with 5-HT. Since current theories of circling behavior hypothesize that the animal turns away from the cerebral hemisphere where dopamine neurotransmission predominates, these results suggest that the contraversive circling induced by the unilateral microinjection of SRIs into the SNc could be mediated by a 5-HT-induced increase of firing frequency of nigrostriatal dopaminergic neurons. When applied into the SNr, clomipramine and duloxetine also elicited a contraversive circling behavior and enhanced the circling induced by 5-HT. Systemic methysergide (1 mg/kg i.p.), but not intranigral mianserin (2 nmol), blocked the circling elicited by microinjection of clomipramine into the SNr, either alone or in combination with 5-HT. These results suggest that 5-HT(2)-like receptors are involved in the contraversive circling induced by enhancement of serotonergic transmission in the SNr." @default.
• W2021528349 created "2016-06-24" @default.
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• W2021528349 date "2002-01-01" @default.
• W2021528349 modified "2023-10-17" @default.
• W2021528349 title "Circling behavior induced by microinjection of serotonin reuptake inhibitors in the substantia nigra" @default.
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• W2021528349 doi "https://doi.org/10.1016/s0091-3057(01)00721-3" @default.
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