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<dc:title xml:lang="fr">Rôle de la rétine dans les fonctions non-visuelles : traitement des informations relatives à la photopériode et impact de la lumière bleue sur le comportement.</dc:title>
<dcterms:alternative xml:lang="en">Role of the retina in non-visual functions : processing of photoperiod-related information and impact of blue light on behaviour</dcterms:alternative>
<dc:subject xml:lang="fr">IpRGCs</dc:subject>
<dc:subject xml:lang="fr">Rétine</dc:subject>
<dc:subject xml:lang="fr">Photopériode</dc:subject>
<dc:subject xml:lang="fr">Lumière bleue</dc:subject>
<dc:subject xml:lang="fr">Agressivité</dc:subject>
<dc:subject xml:lang="fr">Physiologie saisonnière</dc:subject>
<dc:subject xml:lang="fr">Souris</dc:subject>
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<dc:subject xml:lang="en">Retina</dc:subject>
<dc:subject xml:lang="en">Photoperiod</dc:subject>
<dc:subject xml:lang="en">Blue light</dc:subject>
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<dc:subject xml:lang="en">Seasonal physiology</dc:subject>
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<tef:elementdEntree autoriteExterne="034152334" autoriteSource="Sudoc">Cellules ganglionnaires de la rétine</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027868060" autoriteSource="Sudoc">Lumière -- Effets physiologiques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Les cellules ganglionnaires intrinsèquement photosensibles (ipRGCs) constituent une interface majeure dans la régulation de la physiologie et des comportements par la lumière. Ces travaux démontrent que la présence de ces cellules dans la rétine est suffisante pour permettre à des souris d’intégrer les variations saisonnières de la photopériode. De plus, nous décrivons des modifications dépendantes de la photopériode au sein des ipRGCs. Ces résultats suggèrent que la rétine pourrait intégrer les variations de la photopériode, afin d’assurer au mieux les fonctions visuelles et non-visuelles à travers les saisons. Par ailleurs, ces travaux ont exploré les effets de la surexposition aux écrans et notamment à un enrichissement en lumière bleue sur le comportement de type anxieux/agressif. Les ipRGCs, sensibles à la lumière bleue (460-480nm), sont connectées avec de nombreuses structures cérébrales impliquées dans la régulation des comportements. Nos résultats montrent qu’une exposition prolongée à un environnement enrichi en lumière bleue peut modifier les comportements de type agressif.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The intrinsically photosensitive retinal ganglion cells (ipRGCs) constitute a key interface in the regulation of our physiology and behaviours by light. First, this thesis demonstrates that the ipRGCs are sufficient to ensure a normal photoperiod integration. Mice without rods nor cones still encode photoperiod variation through melatonin secretion and display photoperiod-dependent locomotor activity changes. This is the first time we describe photoperiod-dependent changes of the ipRGCs. These data suggest that the retina itself could integrate the photoperiod locally, and thus constitute an adaptative mechanism to regulate both visual and non-visual functions depending on the seasons. Secondly, this thesis assessed the effects of screen overexposure and notably to blue light enrichment on aggressive/anxious behaviour. ipRGCs are particularly sensitive to blue light (460-480nm) and are connected to various brain structures involved in behaviour regulation. We show that exposure to a blue light-enriched environment can modify behaviour such as aggressiveness.</dcterms:abstract>
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