Contribution of serotonergic transmission to the motor and cognitive effects of high-frequency stimulation of the subthalamic nucleus or levodopa in Parkinson's disease.
Identifieur interne : 000E34 ( Ncbi/Checkpoint ); précédent : 000E33; suivant : 000E35Contribution of serotonergic transmission to the motor and cognitive effects of high-frequency stimulation of the subthalamic nucleus or levodopa in Parkinson's disease.
Auteurs : Sylvia Navailles [France] ; Philippe De DeurwaerdèreSource :
- Molecular neurobiology [ 1559-1182 ] ; 2012.
English descriptors
- KwdEn :
- Animals, Antiparkinson Agents (adverse effects), Cognition Disorders (etiology), Cognition Disorders (physiopathology), Deep Brain Stimulation (adverse effects), Deep Brain Stimulation (methods), Humans, Levodopa (adverse effects), Parkinson Disease (drug therapy), Parkinson Disease (physiopathology), Parkinson Disease (therapy), Serotonin (deficiency), Serotonin (physiology), Serotonin (secretion), Subthalamic Nucleus (physiopathology).
- MESH :
- chemical , adverse effects : Antiparkinson Agents, Levodopa.
- adverse effects : Deep Brain Stimulation.
- chemical , deficiency : Serotonin.
- drug therapy : Parkinson Disease.
- etiology : Cognition Disorders.
- methods : Deep Brain Stimulation.
- chemical , physiology : Serotonin.
- physiopathology : Cognition Disorders, Parkinson Disease, Subthalamic Nucleus.
- chemical , secretion : Serotonin.
- therapy : Parkinson Disease.
- Animals, Humans.
Abstract
Although they are effective at treating the motor impairments that are the core symptoms of Parkinson's disease, current treatments, namely L: -3,4-dihydroxyphenylalanine (L: -DOPA), the gold standard medication and high-frequency stimulation of the subthalamic nucleus (HFS-STN), can lead to cognitive and mood alterations. Many of these side effects, such as depression, anxiety and sleep disturbances, could be related to abnormal functioning of the serotonergic system, but much basic research remains to be done. Molecular studies in humans and animal models of the disease have reported diverse drastic changes to the serotonergic system. It has also been shown that the serotonergic system both plays a major role in the mechanism of action of the current therapies and is altered by the therapies. It has been reported that HFS-STN decreases serotonin release in several regions, mostly via inhibition of serotonergic neuron activity. The involvement of serotonergic neurons in L: -DOPA treatment is even more significant. First, serotonergic neurons, able to convert exogenous L: -DOPA to dopamine, are a major site to release dopamine throughout the brain. Second, the substitution of serotonin by newly synthesized dopamine in serotonin neurons leads to acute and chronic alteration of serotonin release and metabolism. Therefore, both therapeutic approaches, via distinct mechanisms, decrease serotonergic system activity and, rather than alleviating cognitive or mood disorders, tend to aggravate them. Molecular strategies targeting the serotonergic system are being developed and could be decisive in limiting L: -DOPA-induced dyskinesia, as well as mood and cognitive symptoms produced by antiparkinsonian therapies.
DOI: 10.1007/s12035-011-8230-0
PubMed: 22222679
Affiliations:
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<front><div type="abstract" xml:lang="en">Although they are effective at treating the motor impairments that are the core symptoms of Parkinson's disease, current treatments, namely L: -3,4-dihydroxyphenylalanine (L: -DOPA), the gold standard medication and high-frequency stimulation of the subthalamic nucleus (HFS-STN), can lead to cognitive and mood alterations. Many of these side effects, such as depression, anxiety and sleep disturbances, could be related to abnormal functioning of the serotonergic system, but much basic research remains to be done. Molecular studies in humans and animal models of the disease have reported diverse drastic changes to the serotonergic system. It has also been shown that the serotonergic system both plays a major role in the mechanism of action of the current therapies and is altered by the therapies. It has been reported that HFS-STN decreases serotonin release in several regions, mostly via inhibition of serotonergic neuron activity. The involvement of serotonergic neurons in L: -DOPA treatment is even more significant. First, serotonergic neurons, able to convert exogenous L: -DOPA to dopamine, are a major site to release dopamine throughout the brain. Second, the substitution of serotonin by newly synthesized dopamine in serotonin neurons leads to acute and chronic alteration of serotonin release and metabolism. Therefore, both therapeutic approaches, via distinct mechanisms, decrease serotonergic system activity and, rather than alleviating cognitive or mood disorders, tend to aggravate them. Molecular strategies targeting the serotonergic system are being developed and could be decisive in limiting L: -DOPA-induced dyskinesia, as well as mood and cognitive symptoms produced by antiparkinsonian therapies.</div>
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