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<dc:title xml:lang="fr">Impact d'un décalage hebdomadaire du cycle lumière-obscurité sur le sommeil, les horloges circadiennes et le comportement chez le rongeur</dc:title>
<dcterms:alternative xml:lang="en">Impact of a weekly shift of the light-dark cycle on sleep, circadian clocks and behavior in rodents</dcterms:alternative>
<dc:subject xml:lang="fr">Comportement</dc:subject>
<dc:subject xml:lang="fr">Horloges circadiennes</dc:subject>
<dc:subject xml:lang="fr">Humeur</dc:subject>
<dc:subject xml:lang="fr">Jetlag social</dc:subject>
<dc:subject xml:lang="fr">Sommeil</dc:subject>
<dc:subject xml:lang="en">Behavior</dc:subject>
<dc:subject xml:lang="en">Circadian clocks</dc:subject>
<dc:subject xml:lang="en">Mood</dc:subject>
<dc:subject xml:lang="en">Social jetlag</dc:subject>
<dc:subject xml:lang="en">Sleep</dc:subject>
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<dcterms:abstract xml:lang="fr">Les horloges circadiennes coordonnent temporellement les fonctions de l’organisme. Dans notre société, nos obligations socio-professionnelles nous contraignent à nous lever et coucher plus tôt que notre horloge biologique le requière, conduisant à un conflit avec notre temporalité biologique interne. C’est le « jetlag social ». Ces travaux de thèse ont porté sur l’usage chez le rongeur d’un protocole lumineux de jetlag hebdomadaire (JLH) mimant le décalage observé chaque week-end chez l’humain. Chez les animaux exposés au JLH, le rythme d’activité locomotrice et de veille-sommeil sont retardés puis avancés chaque fin et début de semaine respectivement. Chez les souris exposées au JLH, l’analyses des horloges moléculaires a montré leur perturbation au sein de l’horloge principale et de structures cérébrales impliquées dans le sommeil et les comportements affectifs et motivé, suggérant un impact du JLH sur ces fonctions. Les souris exposées au JLH manifestent des comportements de type anxieux et de prise de risques pouvant être liés aux perturbations des horloges. Ces résultats démontrent les impacts à long terme du jetlag social sur la santé.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Circadian clocks temporally orchestrate body functions. In our society, socio-professional obligations force us advance our bedtime and awakening, conducting to a conflict between our social and internal temporality. This phenomenon is called “social jetlag”. In this work, we exposed rodents to a weekly shifting light-dark cycle (WJL) reproducing the shifts observed every weekend in social jetlag. In animals exposed to WJL, locomotor activity and sleep- wake rhythms were delayed then advanced during the end and the beginning of the week, respectively. In mice exposed to WJL, analyses of molecular clocks showed alterations on the master clock and other brain structures regulating sleep, as well as affective and motivated behavior, suggesting the impact of WJL on these functions. Mice exposed to WJL display anxiety-like and risk-raking behavior that could be linked to clock changes. These results demonstrate long-term consequences of social jetlag on health.</dcterms:abstract>
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