ParkinsonFranceV1, Hal, Corpus, bibRecord, 000714

Mesencéphalic reticular formation : involvement in the control of locomotion and and gait troubles . An electrophysiological approach in non-human primate and parkinsonian patient

Identifieur interne : 000714 ( Hal/Corpus ); précédent : 000713; suivant : 000715

Mesencéphalic reticular formation : involvement in the control of locomotion and and gait troubles . An electrophysiological approach in non-human primate and parkinsonian patient

Auteurs : Laurent Goetz

Source :

RBID : Hal:tel-00872694

Descripteurs français

mix :
- Electrophysiologie, Formation réticulée mésencéphalique, Locomotion/marche, Noyaux pédonculopontins et cunéiformes, Primate non-humain, Tronc cérébral.

English descriptors

mix :
- Brainstem, Deep brain stimulation, Electrophysiology, Locomotion/gait, Mesencephalic reticular formation, Non human primate, Pedunculopontin & cuneiform nuclei.

Abstract

The comprehension of the physiological and pathophysiological mechanisms involved in the control of locomotion and gait troubles remains a major challenge for biomedical research in order to improve quality and expectancy of life in parkinsonian patient. On the basis of experimental data, deep brain stimulation of the mesencephalic reticular formation (MRF), including the pedunculopontine and cuneiform nuclei, was proposed in 2005 as a new target to treat freezing of gait. However, regarding the heterogeneity of the clinical results, different questions now raise concerning the lack of anatomical and functional data of the MRF especially in non-human primate. The present study falls within a translational approach using clinical and pre-clinical data. First, a non-human primate model of bipedal locomotion was developed and validated on the basis of kinematic data. Multi-sequences MRI methodology was developed, allowing a longitudinal monitoring of the primate protocol and to construct a brainstem atlas of Macaca fascicularis. Then, an electrophysiological mapping of the MRF was performed in two behaving primates during rest and locomotion periods. For the first time, neurons within the MRF were found to respond to locomotion confirming the existence of a mesencephalic locomotor region in primate. After MPTP intoxication, only changes in neuronal discharge pattern were observed and arguments in favor of a misfunctioning of some MRF neurons during gait blockage. Finally, electrophysiological recordings during locomotion and natural transition from wakefulness to sleep suggest a dual function of some MRF neurons in the control of locomotion and arousal. The development of a new coordinate system adapted to human brainstem anatomy allowed to perform an anatomo-clinical evaluation of deep brain stimulation of the pedunculopontine nucleus and to provide a probabilist target for electrode implantation in the MRF to treat freezing of gait in the parkinsonian context.

Url:

https://tel.archives-ouvertes.fr/tel-00872694

Links to Exploration step

Hal:tel-00872694

Le document en format XML

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<front><div type="abstract" xml:lang="en">The comprehension of the physiological and pathophysiological mechanisms involved in the control of locomotion and gait troubles remains a major challenge for biomedical research in order to improve quality and expectancy of life in parkinsonian patient. On the basis of experimental data, deep brain stimulation of the mesencephalic reticular formation (MRF), including the pedunculopontine and cuneiform nuclei, was proposed in 2005 as a new target to treat freezing of gait. However, regarding the heterogeneity of the clinical results, different questions now raise concerning the lack of anatomical and functional data of the MRF especially in non-human primate. The present study falls within a translational approach using clinical and pre-clinical data. First, a non-human primate model of bipedal locomotion was developed and validated on the basis of kinematic data. Multi-sequences MRI methodology was developed, allowing a longitudinal monitoring of the primate protocol and to construct a brainstem atlas of Macaca fascicularis. Then, an electrophysiological mapping of the MRF was performed in two behaving primates during rest and locomotion periods. For the first time, neurons within the MRF were found to respond to locomotion confirming the existence of a mesencephalic locomotor region in primate. After MPTP intoxication, only changes in neuronal discharge pattern were observed and arguments in favor of a misfunctioning of some MRF neurons during gait blockage. Finally, electrophysiological recordings during locomotion and natural transition from wakefulness to sleep suggest a dual function of some MRF neurons in the control of locomotion and arousal. The development of a new coordinate system adapted to human brainstem anatomy allowed to perform an anatomo-clinical evaluation of deep brain stimulation of the pedunculopontine nucleus and to provide a probabilist target for electrode implantation in the MRF to treat freezing of gait in the parkinsonian context.</div>
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            <abstract xml:lang="en">The comprehension of the physiological and pathophysiological mechanisms involved in the control of locomotion and gait troubles remains a major challenge for biomedical research in order to improve quality and expectancy of life in parkinsonian patient. On the basis of experimental data, deep brain stimulation of the mesencephalic reticular formation (MRF), including the pedunculopontine and cuneiform nuclei, was proposed in 2005 as a new target to treat freezing of gait. However, regarding the heterogeneity of the clinical results, different questions now raise concerning the lack of anatomical and functional data of the MRF especially in non-human primate. The present study falls within a translational approach using clinical and pre-clinical data. First, a non-human primate model of bipedal locomotion was developed and validated on the basis of kinematic data. Multi-sequences MRI methodology was developed, allowing a longitudinal monitoring of the primate protocol and to construct a brainstem atlas of Macaca fascicularis. Then, an electrophysiological mapping of the MRF was performed in two behaving primates during rest and locomotion periods. For the first time, neurons within the MRF were found to respond to locomotion confirming the existence of a mesencephalic locomotor region in primate. After MPTP intoxication, only changes in neuronal discharge pattern were observed and arguments in favor of a misfunctioning of some MRF neurons during gait blockage. Finally, electrophysiological recordings during locomotion and natural transition from wakefulness to sleep suggest a dual function of some MRF neurons in the control of locomotion and arousal. The development of a new coordinate system adapted to human brainstem anatomy allowed to perform an anatomo-clinical evaluation of deep brain stimulation of the pedunculopontine nucleus and to provide a probabilist target for electrode implantation in the MRF to treat freezing of gait in the parkinsonian context.</abstract>
            <abstract xml:lang="fr">La compréhension des mécanismes physiologiques et physiopathologiques du contrôle la locomotion et de ses troubles, constitue un enjeu majeur de la recherche biomédicale, pour améliorer la qualité et l'espérance de vie des patients atteints de la maladie de Parkinson. A partir de données expérimentales, la stimulation cérébrale profonde de la formation réticulée mésencéphalique (FRM), incluant les noyaux pédonculopontins et cunéiformes, a été proposée en 2005 comme nouvelle stratégie thérapeutique pour traiter le freezing de la marche. Cependant, au regard de résultats cliniques très hétérogènes, de nombreuses interrogations se posent concernant les connaissances anatomiques et fonctionnelles de la FRM, marquées notamment par un nombre limité de données expérimentales chez le primate non-humain. Cette étude s'inscrit dans une approche translationnelle associant des données cliniques et pré-cliniques. Dans un premier temps, un modèle de locomotion bipède chez le primate non-humain a été développé puis validé à partir de données cinématiques. Une approche IRM multi-séquences a été développée pour permettre un suivi longitudinal du protocole et la construction d'un atlas du tronc cérébral de Macaca fascicularis. Un mapping électrophysiologique de la FRM a ensuite été réalisé chez deux primates éveillés, qui a permis de mettre en évidence pour la première fois, des activités neuronales qui répondaient à la locomotion, confirmant ainsi l'existence d'une région locomotrice mésencéphalique chez le primate. Après intoxication au MPTP, seule une modification du pattern de décharge des neurones de la FRM a été observée, ainsi que des arguments en faveur d'un dysfonctionnement de l'activité de certains neurones de la FRM durant le blocage du pas. Enfin, des enregistrements électrophysiologiques durant des phases de locomotion puis d'endormissement naturel, suggèrent une double implication de populations neuronales dans le contrôle de la locomotion et du niveau de vigilance. La réalisation d'un nouveau système de coordonnées adapté au tronc cérébral humain a permis de réaliser une étude de corrélations anatomo-cliniques des effets de la stimulation cérébrale profonde du noyau pédonculopontin et de proposer une cible probabiliste pour l'implantation d'électrodes dans la FRM pour traiter le freezing de la marche dans le contexte parkinsonien.</abstract>
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	La maladie de Parkinson en France (serveur d'exploration)
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La maladie de Parkinson en France (serveur d'exploration)

Mesencéphalic reticular formation : involvement in the control of locomotion and and gait troubles . An electrophysiological approach in non-human primate and parkinsonian patient

Mesencéphalic reticular formation : involvement in the control of locomotion and and gait troubles . An electrophysiological approach in non-human primate and parkinsonian patient

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Abstract

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