Cited by 8Parkinson's Disease Mechanisms and TreatmentsNeurological disorders and treatmentsNeurotransmitter Receptor Influence on Behavior

Synergistic effect of serotonin 1A and serotonin 1B/D receptor agonists in the treatment of L-DOPA-induced dyskinesia in 6-hydroxydopamine-lesioned rats

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Thomsen, Mikael, Stoica, Anca, Christensen, Kenneth Vielsted, Fryland, Tue, Mikkelsen, Jens D., Hansen, John Bondo·2022·Experimental Neurology

Published version of a preprint

Abstract

BACKGROUND: The gold standard for symptomatic relief of Parkinson's disease (PD) is L-DOPA. However, long-term treatment often leads to motor complications such as L-DOPA-induced dyskinesia (LID). While amantadine (Gocovri™) is the only approved therapy for dyskinesia in PD patients on the American market, it is associated with neurological side effects and limited efficacy. Thus, there remains a high unmet need for addressing LID in PD patients worldwide. OBJECTIVE: The objective of this study was to evaluate the efficacy, safety and performance compared to approved treatments of the serotonin receptor 1A (5-HT1A) and 5-HT1B/D agonists buspirone and zolmitriptan in the 6-hydroxydopamine unilaterally lesioned rat model for PD. METHODS: The hemiparkinsonian 6-OHDA-lesioned rats underwent chronic treatment with L-DOPA to induce dyskinesia and were subsequently used for efficacy testing of buspirone, zolmitriptan and comparison with amantadine, measured as abnormal involuntary movement (AIM) scores after L-DOPA challenge. Safety testing was performed in model and naïve animals using forelimb adjusting, rotarod and open field tests. RESULTS: 5-HT1A and 5-HT1B/D agonism effectively reduced AIM scores in a synergistic manner. The drug combination of buspirone and zolmitriptan was safe and did not lead to tolerance development following sub-chronic administration. Head-to-head comparison with amantadine showed superior performance of buspirone and zolmitriptan in the model. CONCLUSIONS: The strong anti-dyskinetic effect found with combined 5-HT1A and 5-HT1B/D agonism renders buspirone and zolmitriptan together a meaningful treatment for LID in PD.

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Authors
Thomsen, M., Stoica, A., Christensen, K. V., Fryland, T., Mikkelsen, J. D., & Hansen, J. B.
Affiliations
University of Copenhagen (DK)
Corresponding author
Christensen, Kenneth Vielsted
Venue
Experimental Neurology
Publisher
Elsevier BV
Published
2022-12
Volume
358
Pages
114209
ISSN
0014-4886 (ISSN-L)
OpenAlex
W4292241575
Cited by
8
References
127
Citations by year
2026: 2 · 2025: 1 · 2024: 3 · 2023: 2
FWCI
0.79
Type
journal article
Language
en
Open access
Locations
  • Experimental Neurology (publishedVersion, cc-by-nc-nd)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, cc-by-nc-nd)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Health Sciences › Medicine › Neurology › Neurological disorders and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
levodopa-induced dyskinesia, Parkinson's disease, buspirone, zolmitriptan, amantadine, 6-hydroxydopamine lesion, hemiparkinsonian rat model, abnormal involuntary movements, drug synergy, drug safety
MeSH terms
Amantadine, Animals, Antiparkinson Agents, Buspirone, Dyskinesia, Drug-Induced, Levodopa, Parkinson Disease, Receptors, Serotonin, Serotonin, Tryptamines, Oxidopamine, Rats, Sprague-Dawley, Oxazolidinones, Rats, Serotonin 5-HT1 Receptor Agonists

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