Role of serotonin neurons in the induction of levodopa- and graft-induced dyskinesias in Parkinson's disease.
Author
Summary, in English
Recent studies in animal models of Parkinson's disease (PD) have provided evidence that dopamine released from spared serotonin afferents can act as a trigger of dyskinetic movements induced by repetitive, low doses of levodopa. Serotonin neurons have the capacity to store and release dopamine synthesized from systemically administered levodopa. However, because of the lack of any autoregulatory feedback control, dopamine released from serotonin terminals results in excessive swings in extracellular dopamine levels after peripheral administration of levodopa. Such "dysregulated" release of levodopa-derived dopamine is likely to be responsible for the appearance of the abnormal movements in levodopa-primed animals. This mechanism may also play a role in the development of graft-induced dyskinesias in patients that receive fetal neuron transplants, possibly due to the inclusion of serotonin neurons in the grafted ventral midbrain tissue, which contribute to maintain dopamine receptors of the denervated striatum in a supersensitive state.
Department/s
Publishing year
2010
Language
English
Pages
174-179
Publication/Series
Movement Disorders
Volume
25 Suppl 1
Links
Document type
Journal article
Publisher
John Wiley & Sons Inc.
Topic
- Neurology
Status
Published
Research group
- Neurobiology
- Brain Repair and Imaging in Neural Systems (BRAINS)
ISBN/ISSN/Other
- ISSN: 0885-3185