Local administration of l-DOPA in the chicken ventromedial hypothalamus increases dopamine release in a dose-dependent manner

Alam, Mohammad; Yoshizawa, Fumiaki; Sugahara, Kunio

doi:10.1016/j.neulet.2012.08.054

Cited by 3 publications

(1 citation statement)

References 12 publications

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“…However, in light of the evidence that 5-HT neurons are responsible for the release of DA induced by L-DOPA, this brain region is probably not the unique target of L-DOPA’s effects. Indeed, 5-HT neurons originating from the dorsal (DR) and median (MR) raphe nuclei send widespread innervation throughout the entire brain. , Moreover, increases in DA release induced by systemic or focal application of L-DOPA have also been observed in various brain regions using single microdialysis probe implantation including the hippocampus, the entopeduncular nucleus, the substantia nigra, and the hypothalamus. , The implantation of several dialysis probes is interesting to simultaneously monitor DA extracellular levels induced by L-DOPA within multiple brain regions and to study the regional sensitivity to L-DOPA upon several neurotransmitter systems. In the next section, we review data showing how the use of a multisite microdialysis approach has shed light on the importance of extrastriatal DA release induced by L-DOPA.…”

Section: Multisite Implantation Of Dialysis Probes To Study the Regio...mentioning

confidence: 99%

Multisite Intracerebral Microdialysis to Study the Mechanism of L-DOPA Induced Dopamine and Serotonin Release in the Parkinsonian Brain

Navailles

Lagière

Contini

et al. 2013

ACS Chem. Neurosci.

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L-DOPA is currently one of the best medications for Parkinson's disease. It was assumed for several years that its benefits and side effects were related to the enhancement of dopamine release in the dopamine-depleted striatum. The use of intracerebral microdialysis combined with a pharmacological approach has led to the discovery that serotonergic neurons are responsible for dopamine release induced by L-DOPA. The subsequent use of multisite microdialysis has further revealed that L-DOPA-stimulated dopamine release is widespread and related to the serotonergic innervation. The present Review emphasizes the functional impact of extrastriatal release of dopamine induced by L-DOPA in both the therapeutic and side effects of L-DOPA. KEYWORDS: multisite intracerebral microdialysis, L-DOPA, DA and 5-HT release, 5-HT neurons, region-dependent effects, clearance mechanisms L-DOPA is the best medication for Parkinson's disease. The use of L-DOPA as a treatment for Parkinson's disease began soon after the discovery that the striatal tissue concentration of dopamine (DA) was lower in Parkinsonian patients compared to age-matched individuals.1 The efficacy of L-DOPA was improved by combination with a peripheral inhibitor of Laromatic amino acid decarboxylase (AADC) to prevent the conversion of L-DOPA into DA in the bloodstream, thus enhancing the brain penetration of L-DOPA. Although L-DOPA is highly effective in relieving motor symptoms, numerous motor and nonmotor side-effects including L-DOPA-induced dyskinesias and psychosis can gradually emerge over time.2 The functional impact of L-DOPA in the Parkinsonian brain may not be solely restricted to its ability to restore "physiological levels" of DA in the striatum. Further investigations of its mechanism of action are thoroughly needed in order to address the motor and nonmotor side-effects of L-DOPA.Intracerebral microdialysis is a powerful sampling technique used to monitor steady-state extracellular levels of neurotransmitters in vivo. This technique has helped to decipher the mechanism of action of numerous drugs and medications with respect to their action toward neurotransmitter systems. Furthermore, the development of simultaneous implantation of multiple microdialysis probes in distinct brain regions (referred to here as multisite microdialysis) has proven its strength in revealing region-dependent dynamics of neurotransmitter release in response to pharmacological challenges and the neurochemical interactions between brain regions.Here, we summarize data showing the numerous advantages of intracerebral microdialysis to decipher the diverse features of the mechanism of action of L-DOPA in the Parkinsonian brain by using both a classical neuropharmacological approach and a multisite microdialysis approach. The present Review emphasizes the effect of L-DOPA in extrastriatal brain regions and how the region-dependent pattern of DA release induced by L-DOPA through serotonergic (5-HT) neurons may be relevant to its therapeutic and/or side-effects. I. THE US...

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Section: Multisite Implantation Of Dialysis Probes To Study the Regio...mentioning

confidence: 99%

Multisite Intracerebral Microdialysis to Study the Mechanism of L-DOPA Induced Dopamine and Serotonin Release in the Parkinsonian Brain

Navailles

Lagière

Contini

et al. 2013

ACS Chem. Neurosci.

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Serotonin release in the caudal nidopallium of adult laying hens genetically selected for high and low feather pecking behavior: An in vivo microdialysis study

Kops

Kjaer

Güntürkün

et al. 2014

Behavioural Brain Research

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Expanding the repertoire of L-DOPA’s actions: A comprehensive review of its functional neurochemistry

Deurwaerdère

Giovanni

Millan

2017

Progress in Neurobiology

109

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Local administration of l-DOPA in the chicken ventromedial hypothalamus increases dopamine release in a dose-dependent manner

Cited by 3 publications

References 12 publications

Multisite Intracerebral Microdialysis to Study the Mechanism of L-DOPA Induced Dopamine and Serotonin Release in the Parkinsonian Brain

Multisite Intracerebral Microdialysis to Study the Mechanism of L-DOPA Induced Dopamine and Serotonin Release in the Parkinsonian Brain

Serotonin release in the caudal nidopallium of adult laying hens genetically selected for high and low feather pecking behavior: An in vivo microdialysis study

Expanding the repertoire of L-DOPA’s actions: A comprehensive review of its functional neurochemistry

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