Serotonin neuron transplants exacerbate L-DOPA-induced dyskinesias in a rat model of Parkinson's disease
Carlsson, Thomas LU ; Carta, Manolo LU ; Winkler, Christian LU ; Björklund, Anders LU
and Kirik, Deniz
LU
(2007)
In The Journal of Neuroscience
27(30).
p.8011-8022
- Abstract
- Clinical trials in patients with Parkinson's disease have shown that transplants of fetal mesencephalic dopamine neurons can form a new functional innervation of the host striatum, but the clinical benefits have been highly variable: some patients have shown substantial recovery in motor function, whereas others have shown no improvement and even a worsening in the 3,4-dihydroxyphenyl-L-alanine (L-DOPA)-induced dyskinetic side effects. Differences in the composition of the grafted cell preparation may contribute to these discrepancies. In particular, the number of serotonin neurons contained in the graft can vary greatly depending on the dissection of the fetal tissue. Importantly, serotonin neurons have the ability to store and release... (More)
- Clinical trials in patients with Parkinson's disease have shown that transplants of fetal mesencephalic dopamine neurons can form a new functional innervation of the host striatum, but the clinical benefits have been highly variable: some patients have shown substantial recovery in motor function, whereas others have shown no improvement and even a worsening in the 3,4-dihydroxyphenyl-L-alanine (L-DOPA)-induced dyskinetic side effects. Differences in the composition of the grafted cell preparation may contribute to these discrepancies. In particular, the number of serotonin neurons contained in the graft can vary greatly depending on the dissection of the fetal tissue. Importantly, serotonin neurons have the ability to store and release dopamine, formed from exogenously administered L-DOPA. Here, we have evaluated the effect of transplants containing serotonin neurons, or a mixture of dopamine and serotonin neurons, on L-DOPA-induced dyskinesias in 6-hydroxydopamine-lesioned animals. As expected, dopamine neuron-rich grafts induced functional recovery, accompanied by a 60% reduction in L-DOPA-induced dyskinesia that developed gradually over the first 10 weeks. Rats with serotonin-rich grafts with few dopamine neurons, in contrast, showed a progressive worsening of their L-DOPA-induced dyskinesias over time, and no functional improvement. The antidyskinetic effect of dopamine-rich grafts was independent of the number of serotonin neurons present. We conclude that serotonin neurons in the grafts are likely to have a detrimental effect on L-DOPA-induced dyskinesias in cases in which the grafts contain no or few dopamine neurons. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/691650
- author
- Carlsson, Thomas
LU
; Carta, Manolo
LU
; Winkler, Christian
LU
; Björklund, Anders
LU
and Kirik, Deniz
LU
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- ventral mesenchephalon, levodopa, dopamine, cell grafting, 5-hydroxytryptamine, 6-hydroxydopamine
- in
- The Journal of Neuroscience
- volume
- 27
- issue
- 30
- pages
- 12 pages
- publisher
- Society for Neuroscience
- external identifiers
-
- wos:000248484800013
- scopus:34547484764
- pmid:17652591
- ISSN
- 1529-2401
- DOI
- 10.1523/JNEUROSCI.2079-07.2007
- language
- English
- LU publication?
- yes
- id
- db54f09d-03f8-47ad-bd22-79f75bac0ccb (old id 691650)
- date added to LUP
- 2016-04-01 16:46:07
- date last changed
- 2023-10-03 01:48:41
@article{db54f09d-03f8-47ad-bd22-79f75bac0ccb,
abstract = {{Clinical trials in patients with Parkinson's disease have shown that transplants of fetal mesencephalic dopamine neurons can form a new functional innervation of the host striatum, but the clinical benefits have been highly variable: some patients have shown substantial recovery in motor function, whereas others have shown no improvement and even a worsening in the 3,4-dihydroxyphenyl-L-alanine (L-DOPA)-induced dyskinetic side effects. Differences in the composition of the grafted cell preparation may contribute to these discrepancies. In particular, the number of serotonin neurons contained in the graft can vary greatly depending on the dissection of the fetal tissue. Importantly, serotonin neurons have the ability to store and release dopamine, formed from exogenously administered L-DOPA. Here, we have evaluated the effect of transplants containing serotonin neurons, or a mixture of dopamine and serotonin neurons, on L-DOPA-induced dyskinesias in 6-hydroxydopamine-lesioned animals. As expected, dopamine neuron-rich grafts induced functional recovery, accompanied by a 60% reduction in L-DOPA-induced dyskinesia that developed gradually over the first 10 weeks. Rats with serotonin-rich grafts with few dopamine neurons, in contrast, showed a progressive worsening of their L-DOPA-induced dyskinesias over time, and no functional improvement. The antidyskinetic effect of dopamine-rich grafts was independent of the number of serotonin neurons present. We conclude that serotonin neurons in the grafts are likely to have a detrimental effect on L-DOPA-induced dyskinesias in cases in which the grafts contain no or few dopamine neurons.}},
author = {{Carlsson, Thomas and Carta, Manolo and Winkler, Christian and Björklund, Anders and Kirik, Deniz}},
issn = {{1529-2401}},
keywords = {{ventral mesenchephalon; levodopa; dopamine; cell grafting; 5-hydroxytryptamine; 6-hydroxydopamine}},
language = {{eng}},
number = {{30}},
pages = {{8011--8022}},
publisher = {{Society for Neuroscience}},
series = {{The Journal of Neuroscience}},
title = {{Serotonin neuron transplants exacerbate L-DOPA-induced dyskinesias in a rat model of Parkinson's disease}},
url = {{http://dx.doi.org/10.1523/JNEUROSCI.2079-07.2007}},
doi = {{10.1523/JNEUROSCI.2079-07.2007}},
volume = {{27}},
year = {{2007}},
}