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<dc:title xml:lang="en">Exploration of the peptidergic modulation of pain</dc:title>
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<dcterms:abstract xml:lang="fr">Le traitement des douleurs est un enjeu important au vu des dizaines de millions de personnes souffrant de douleurs chroniques dans le monde. La douleur est modulée entre autre par des neuropeptides, en faisant des cibles thérapeutiques de choix. Ainsi, j’ai tout d’abord travaillé sur la relaxine-3, un peptide synthétisé dans le nucleus incertus qui agit sur le récepteur RXFP3. L’activation de ce dernier dans l’amygdale entraîne une antidouleur transitoire chez le rongeur. Nous avons donc essayé de caractériser l’effet de l’activation de RXFP3 sur les circuits neuronaux de l’amygdale pour expliquer cet effet antidouleur. Notre étude a montré que l’activation de ce récepteur n’induit aucun changement sur les neurones de l’amygdale. Je me suis ensuite intéressé à l’ocytocine, un peptide hypothalamique déjà connu pour avoir un effet antidouleur. Dans ce cadre, j’ai utilisé un nouvel outil permettant de détecter la présence d’ocytocine : le GrabOT. J’ai ainsi pu en faire la caractérisation pharmacologique ainsi que le mettre en application dans une étude où nous avons montré un circuit ocytocinergique impliquant la substance grise périaqueducale ventrolatérale dans la médiation de son effet antidouleur.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Treatment of pain is a major challenge knowing that dozens of millions of people suffer from chronic pain worldwide. Pain is modulated among others by neuropeptides, making them suitable therapeutical targets. I started working on the relaxin-3, a peptide synthetized in the brain by the nucleus incertus that acts on the receptor RXFP3. The activation of this receptor in the amygdala triggers transitory analgesia in rodents. Therefore, we tried to characterize the effect of the modulation of RXFP3 on the neuronal circuits of the amygdala that could explain the analgesic effect. Our study showed that the activation of RXFP3 does not induce any changes on the neurons in the amygdala. I then moved on the oxytocin, a hypothalamic peptide already known for its analgesic effect. I used a newly developed tool called GrabOT that detect the presence of oxytocin in the extracellular space. I first performed a pharmacological characterization of this receptor and I had the opportunity to use it in a study where we showed an oxytocinergic circuit using the ventrolateral periaqueductal gray as a relay to mediate its analgesic effect.</dcterms:abstract>
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