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• W2600577557 endingPage "178" @default.
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• W2600577557 abstract "l-DOPA remains the benchmark treatment for Parkinson's disease (PD) motor symptoms, but chronic use leads to l-DOPA-induced dyskinesia (LID). The serotonin (5-HT) system has been established as a key modulator of LID and 5-HT1A receptors (5-HT1AR) stimulation has been shown to convey anti-dyskinetic effects. However, 5-HT1AR agonists often compromise clinical efficacy or display intrinsic side effects and their site(s) of actions remain debatable. Recently, highly selective G-protein biased 5-HT1AR agonists, F13714 and F15599, were shown to potently target 5-HT1A auto- or hetero-receptors, respectively. The current investigation sought to identify the signaling mechanisms and neuroanatomical substrates by which 5-HT1AR produce behavioral effects. In experiment 1, hemi-parkinsonian, l-DOPA-primed rats received systemic injections of vehicle, F13714 (0.01 or 0.02mg/kg), or F15599 (0.06 or 0.12mg/kg) 5min prior to l-DOPA (6mg/kg), after which LID, motor performance and 5-HT syndrome were rated. Both compounds significantly reduced LID, without affecting motor performance, however, acute administration of F13714 significantly induced 5-HT syndrome at anti-dyskinetic doses. In experiment 2, we elucidated the role of striatal 5-HT1AR in the effects of F13714 and F15599. Hemi-parkinsonian, l-DOPA-primed rats received bilateral intra-striatal microinjections of either F13714 (0, 2 or 10μg/side) or F15599 (0, 10 or 30μg/side) 5min prior to systemic l-DOPA (6mg/kg). Intra-striatal effects mimicked systemic effects, suggesting that striatal 5-HT1AR sub-populations play an important role in the anti-LID and pro-5-HT syndrome profiles of F13714 and F15599. Finally, in experiment 3, we examined the effects of F13714 and F15599 on D1 receptor (D1R) agonist-induced dyskinesia by administering either compound 5min prior to SKF 38393 (2mg/kg). While F13714 resulted in a mild delay in D1R-mediated dyskinesia, F15599 had no effect. Collectively these data suggest that the F-series compounds articulate their anti-LID effects through activation of a diverse set of striatal 5-HT1A hetero-receptor populations." @default.
• W2600577557 created "2017-04-07" @default.
• W2600577557 creator A5010041349 @default.
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• W2600577557 creator A5063754036 @default.
• W2600577557 creator A5089942283 @default.
• W2600577557 date "2017-06-01" @default.
• W2600577557 modified "2023-09-27" @default.
• W2600577557 title "Characterizing the differential roles of striatal 5-HT 1A auto- and hetero-receptors in the reduction of l -DOPA-induced dyskinesia" @default.
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