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<dc:title xml:lang="fr">Évaluation de l’impact de la perturbation du rythme circadien sur la fonction de reproduction des mammifères femelles</dc:title>
<dcterms:alternative xml:lang="en">Assessment of circadian disruption impact on female mammals’ reproductive function</dcterms:alternative>
<dc:subject xml:lang="fr">Reproduction féminine</dc:subject>
<dc:subject xml:lang="fr">Pic préovulatoire de l’hormone lutéinisante</dc:subject>
<dc:subject xml:lang="fr">Perturbation du rythme circadien</dc:subject>
<dc:subject xml:lang="fr">Travail en horaires décalés</dc:subject>
<dc:subject xml:lang="fr">Neuroendocrinologie</dc:subject>
<dc:subject xml:lang="en">Female reproductive function</dc:subject>
<dc:subject xml:lang="en">Preovulatory luteinizing hormone surge</dc:subject>
<dc:subject xml:lang="en">Circadian disruption</dc:subject>
<dc:subject xml:lang="en">Shift work</dc:subject>
<dc:subject xml:lang="en">Neuroendocrinology</dc:subject>
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<dcterms:abstract xml:lang="fr">Chez les mammifères femelles, une fertilité optimale repose sur la synchronisation des évènements neuroendocriniens et comportementaux régulant la fonction de reproduction. Pour cela, l’horloge circadienne principale, entrainée par l’alternance lumière/obscurité, rythme l’axe hypothalamo-hypophyso-ovarien. Ainsi, des cycles jour/nuit irréguliers, comme lors du travail en horaires décalés, peuvent altérer la fonction de reproduction et diminuer la fertilité, notamment chez les femmes. Ce travail de recherche visait à évaluer les effets de la perturbation du rythme circadien sur la fonction de reproduction féminine et à étudier les mécanismes neuroendocriniens sous-jacents. Chez la souris femelles, l’exposition à un décalage horaire chronique a entrainé une désynchronisation majeure du pic préovulatoire de LH, persistant plusieurs semaines. Cette altération était associée à une modification de la transmission de l’information journalière de l’horloge principale aux neurones à kisspeptine qui régulent la sécrétion de LH. De plus, la capacité reproductive des souris était diminuée, mais sans effet majeur sur le développement de leur descendance.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In female mammals, optimal fertility relies on the synchronization of neuroendocrine and behavioral events regulating reproductive function. To this end, the circadian timing system, entrained by the light-dark cycle, sets the pace for the hypothalamic-pituitary-ovarian axis. Therefore, irregular light-dark cycles, such as those experienced in shift work, can disrupt reproductive function and compromise fertility, especially in women. This research aimed to assess the effects of circadian disruption on female reproductive function and investigate the underlying neuroendocrine mechanisms. In female mice, exposure to a light-based shift work model led to a major desynchronization of the preovulatory LH surge, which persisted for several weeks. This disruption was associated with altered transmission of daily signals from the master circadian clock to kisspeptin neurons, which regulate LH secretion. Additionally, reproductive outcomes in mice were affected, though without any major impact on offspring development.</dcterms:abstract>
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