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<dc:title xml:lang="fr">La peau, un modèle d'horloge périphérique</dc:title>
<dcterms:alternative xml:lang="en">The skin as a peripheral clock model</dcterms:alternative>
<dc:subject xml:lang="fr">Per1</dc:subject>
<dc:subject xml:lang="fr">Bmal1</dc:subject>
<dc:subject xml:lang="fr">Horloge périphérique</dc:subject>
<dc:subject xml:lang="fr">Rythmes circadiens</dc:subject>
<dc:subject xml:lang="fr">Synchronisation</dc:subject>
<dc:subject xml:lang="fr">Peau</dc:subject>
<dc:subject xml:lang="fr">Fibroblastes</dc:subject>
<dc:subject xml:lang="fr">Bioluminescence</dc:subject>
<dc:subject xml:lang="fr">Développement postnatal</dc:subject>
<dc:subject xml:lang="fr">Vieillissement</dc:subject>
<dc:subject xml:lang="fr">Compensation thermique</dc:subject>
<dc:subject xml:lang="fr">Mélatonine</dc:subject>
<dc:subject xml:lang="fr">Lentivirus</dc:subject>
<dc:subject xml:lang="en">Per1</dc:subject>
<dc:subject xml:lang="en">Bmal1</dc:subject>
<dc:subject xml:lang="en">Peripheral clock</dc:subject>
<dc:subject xml:lang="en">Circadian rhythms</dc:subject>
<dc:subject xml:lang="en">Synchronization</dc:subject>
<dc:subject xml:lang="en">Skin</dc:subject>
<dc:subject xml:lang="en">Fibroblasts</dc:subject>
<dc:subject xml:lang="en">Bioluminescence</dc:subject>
<dc:subject xml:lang="en">Postnatal development</dc:subject>
<dc:subject xml:lang="en">Ageing</dc:subject>
<dc:subject xml:lang="en">Temperature compensation</dc:subject>
<dc:subject xml:lang="en">Melatonin</dc:subject>
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<tef:elementdEntree autoriteExterne="031384285" autoriteSource="Sudoc">Cellules épithéliales</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027349098" autoriteSource="Sudoc">Rythmes circadiens</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027576132" autoriteSource="Sudoc">Biologie du développement</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Ce travail avait pour objet d’étudier les propriétés d’horloge et de synchronisation de la peau, un modèle potentiel d’horloge périphérique. L’activité rythmique a été analysée par bioluminescence en temps réel, sur des explants de peau abdominale et des fibroblastes dermiques primaires, isolés à partir de rats transgéniques Per1-luciférase. Nous avons montré que des explants de peau présentent une activité rythmique soutenue en culture, indiquant une importante synchronisation interne dans le tissu. Cette synchronisation se manifeste au cours du développement post-natal à partir de 1 mois et augmente jusqu’à 6 mois, avant de décroître, laissant place à des rythmes altérés à l’âge de 2 ans. Nous avons aussi établi que les fibroblastes dermiques présentent la propriété de compensation thermique commune à toutes les horloges circadiennes, et qu’ils sont potentiellement synchronisables par la mélatonine puisque celle-ci augmente leur amplitude en culture. Nous avons aussi préparé un vecteur lentiviral exprimant le gène rapporteur luciférase sous le contrôle du promoteur du gène horloge Bmal1, un nouvel outil pour compléter l’étude des rythmes dans les cellules de la peau.</dcterms:abstract>
<dcterms:abstract xml:lang="en">This work aimed to investigate the skin as a potential model of peripheral clock by characterizing its rhythmic and synchronization properties. Circadian activity was examined in abdominal skin explants and fibroblasts derived from Per1-Luciferase transgenic rats by real-time recording of bioluminescence. First, the skin clock was characterized from early postnatal to old age. Low amplitude oscillations appeared at 1 month only and their robustness increased until 6 months. In 1-2 year-old rats, skin circadian rhythms showed decreasing amplitude and abnormal cycles. Primary fibroblasts derived from the skin at the same ages demonstrated similar pattern of clock activity. Temperature compensation, an intrinsic clock feature, was shown the first time in skin and primary fibroblasts. Secondly, we demonstrated a phase-dependent effect of melatonin to increase the amplitude of oscillations in skin primary fibroblasts, indicating it displays a synchronising role in the circadiansystem. Finally, to facilitate our studies on the multioscillatory skin tissue, we constructed a lentivirus carrying a Bmal1-luciferase reporter, to measure clock genes activities in human skin cells.</dcterms:abstract>
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