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<dc:title xml:lang="en">Rheostasis and timing : a tanycyte-mediated process</dc:title>
<dcterms:alternative xml:lang="fr">Rhéostasie et timing : un processus médié par les tanycytes</dcterms:alternative>
<dc:subject xml:lang="fr">Hamster sibérien</dc:subject>
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<dc:subject xml:lang="fr">Rhéostasie</dc:subject>
<dc:subject xml:lang="fr">Plasticité</dc:subject>
<dc:subject xml:lang="fr">Saisonnière</dc:subject>
<dc:subject xml:lang="fr">Physiologie</dc:subject>
<dc:subject xml:lang="fr">Métabolisme</dc:subject>
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<dc:subject xml:lang="en">Rheostasis</dc:subject>
<dc:subject xml:lang="en">Seasonal</dc:subject>
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<tef:elementdEntree autoriteExterne="184181852" autoriteSource="Sudoc">Cellules épendymogliales</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les propriétés géophysiques de la Terre entraînent des changements annuels dans l'irradiation solaire, entraînant des fluctuations saisonnières de la température et de la disponibilité alimentaire. Dans ce contexte, l’objectif principal de cette thèse était d’élucider la signature moléculaire des tanycytes dans deux paradigmes saisonniers qui modifient le métabolisme ; la programmation photopériodique maternelle (chez le hamster sibérien, Phodopus sungorus) et l’hibernation (chez le hamster doré, Mesocricetus auratus). Ici, nous avons également observé une modification des gènes liés aux cils en réponse à la photopériode et à l'état réfractaire. Collectivement, les résultats présentés dans cette thèse suggèrent que les changements dans l’expression des gènes liés aux cils et dans le nombre de cils sur les tanycytes pourraient, via des altérations dans la signalisation des métabolites, être un mécanisme rhéostatique altérant la régulation métabolique vers l'hypothalamus, permettant à un animal d'adapter sa physiologie métabolique à l'environnement.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The overarching objective of this thesis was to elucidate the molecular signature of tanycytes in two seasonal paradigms that shift metabolism ; maternal photoperiodic programming (Siberian hamster, Phodopus Sungorus) and hibernation (golden hamster, Mesocricetus auratus). Collectively, the findings presented in this thesis suggest that changes in cilia-related genes and numbers of cilia on tanycytes and, therefore presumably alterations in metabolite signalling via tanycytes, may be a rheostatic mechanism altering metabolic feedback to the hypothalamus allowing an animal to match their metabolic physiology to the environment.</dcterms:abstract>
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