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<dc:title xml:lang="en">Daily-, estral-and age - dependent regulation of RFRP-3 neurons and their role in luteinizing hormone secretion in female mice</dc:title>
<dcterms:alternative xml:lang="fr">Régulation des neurones à RFRP-3 en fonction de la journée, du cycle estral et de l'âge et leur rôle dans la sécrétion de l'hormone lutéinisante chez les souris femelles</dcterms:alternative>
<dc:subject xml:lang="fr">Arg-Phe amide-related peptide</dc:subject>
<dc:subject xml:lang="fr">Arginine vasopressin</dc:subject>
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<dc:subject xml:lang="en">Arg-Phe amide-related peptide</dc:subject>
<dc:subject xml:lang="en">Arginine vasopressin</dc:subject>
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<dcterms:abstract xml:lang="fr">Dans cette thèse, nous avons démontré que les neurones RFRP-3 agissent comme un lieu de relais pour les signaux journaliers et ovariens qui sont transmis à l'axe HPG. Nous avons noté des changements temporels dans l'activité neuronale du RFRP-3 et dans la densité des projections des fibres AVP et VIP sur les neurones à RFRP-3. Nous avons démontré que l'activité électrique du RFRP-3 présente des altérations dépendantes du stade oestral avec une fréquence de spikes plus élevée en proestrus. L'application d'AVP augmente l'activité électrique du RFRP-3 uniquement en milieu de journée au stade du diestrus, tandis que le VIP n'a aucun effet pendant la transition jour-nuit. Enfin, nous avons démontré qu'au cours de la sénescence, l'expression du RFRP-3 diminue, tandis que les variations journalières de l'activité neuronale du RFRP-3 et de la sortie du SCN sur les neurones du RFRP-3 ont disparues. Nos résultats soulignent la nécessité d'un système circadien fonctionnel pour une bonne reproduction féminine et montrent l'impact du RFRP-3 sur le contrôle quotidien de la reproduction.</dcterms:abstract>
<dcterms:abstract xml:lang="en">In this thesis, we provided evidence that RFRP-3 neurons act as a locus of relay for daily and ovarian cues that are conveyed to the HPG axis. We reported temporal changes in the RFRP-3 neuronal activity and in the density of AVP and VIP fiber projections on RFRP-3 neurons. We demonstrated that the RFRP-3 electrical activity exhibits estrous-stage dependent alterations with a higher spike frequency in proestrus. AVP application increases the RFRP-3 firing activity only at midday of the diestrus stage, while VIP had no effect during the day-to-night transition of either diestrus or proestrus. Finally, we demonstrated that during senescence the RFRP-3 expression decreases, while daily variations in both the RFRP-3 neuronal activity and the SCN output on RFRP-3 neurons were lost. Altogether, our findings highlight the requirement of a functional and well-synchronized circadian system for proper female reproduction and display the impact of RFRP-3 on the daily control of reproduction.</dcterms:abstract>
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