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<dc:title xml:lang="en">Ultrastructural, molecular and functional heterogeneities of cerebellar granule cell presynaptic terminals</dc:title>
<dcterms:alternative xml:lang="fr">Hétérogénéités ultrastructurales, moléculaires et fonctionnelles aux terminaisons synaptiques des cellules en grain du cervelet</dcterms:alternative>
<dc:subject xml:lang="fr">Neurone</dc:subject>
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<dc:subject xml:lang="fr">Interneurone de la couche moléculaire</dc:subject>
<dc:subject xml:lang="fr">Neurotransmission</dc:subject>
<dc:subject xml:lang="fr">Plasticité synaptique à court terme</dc:subject>
<dc:subject xml:lang="fr">Synapsine2</dc:subject>
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<dc:subject xml:lang="en">Neurone</dc:subject>
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<dc:subject xml:lang="en">Short-term synaptic plasticity</dc:subject>
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<dcterms:abstract xml:lang="fr">Le cervelet est une structure cérébrale impliquée dans la régulation motrice. Dans le cortex cerebelleux, les informations sensorimotrices sont transmises par les cellules en grain. Mon travail de thèse démontre que les connections synaptiques de ces neurones ont des propriétés hétérogènes. D’une synapse à l’autre, j’ai pu observer des variations d’ultrastructure, de composition moléculaire et de fonctionnement au cours de trains de potentiels d’action à haute fréquence. Plus particulièrement, j’ai caractérisé les propriétés de « plasticité à court terme » des synapses unitaires des cellules en grain : 1) Elles sont très différentes d’une synapse à l’autre et peuvent être classées en différentes sous-catégories. 2) Certaines catégories de fonctionnement synaptique reposent sur l’expression de molécules telles que la Synapsine2. 3) La réponse d’un neurone post-synaptique à de hautes fréquences de stimulation dépend de la nature de la synapse activée.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Cerebellum is a brain structure involved in motor regulation and motor learning. In the cerebellar cortex, sensorimotor information is transmitted by granule cells. During my PhD, I demonstrated that the properties of individual granule cell synaptic connections are highly heterogeneous. From one synapse to another, I observed ultrastructural, molecular and functional variability at unitary contacts. More precisely, I assessed the properties of short term plasticity at individual synapses during high frequency trains of stimulation :1) Short term plasticities are highly heterogeneous from one synapse to another and can be classified in sub-categories.2) Some categories of short-term plasticity profiles relie on the expression of molecules such as Synapsin2.3) The response of post-synaptic neuron to high-frequency inputs is dependent on the nature of the activated synaptic contact.</dcterms:abstract>
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