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<dc:title xml:lang="fr">Caractérisation du contrôle descendant inhibiteur ocytocinergique et de sa modulation par un stress de séparation maternelle néonatale</dc:title>
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<dc:subject xml:lang="fr">Douleur</dc:subject>
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<dc:subject xml:lang="fr">Séparation maternelle</dc:subject>
<dc:subject xml:lang="fr">Stress post-natal</dc:subject>
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<dc:subject xml:lang="fr">Contrôles descendants de la douleur</dc:subject>
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<dc:subject xml:lang="en">Oxytocin</dc:subject>
<dc:subject xml:lang="en">Maternal separation</dc:subject>
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<dc:subject xml:lang="en">Hypothalamus</dc:subject>
<dc:subject xml:lang="en">Descending controls of pain</dc:subject>
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<tef:elementdEntree autoriteExterne="050762451" autoriteSource="Sudoc">Pharmacologie néonatale</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="03182269X" autoriteSource="Sudoc">Stress -- Physiologie</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’ocytocine est un petit peptide synthétisé par des neurones de l’hypothalamus. Il est connu pour ses rôles dans la reproduction et les interactions sociales, en particulier dans les interactions mère-enfants, mais possède également un effet analgésique endogène. Au cours de cette thèse, j’ai cherché à comprendre plus en détail les circuits qui sous-tendent son effet analgésique. Dans un second temps j’ai cherché à déterminer si une séparation maternelle précoce, qui affecte les interactions mère-enfants, perturbe les réponses à la douleur et l’analgésie ocytocinergique chez la descendance. Ces travaux ont permis d’identifier un groupe de neurones ocytocinergiques dans l’hypothalamus, capables de diminuer la douleur par une double action. D’une part ils inhibent directement la transmission de l’information nociceptive dans la moelle épinière, et d’autre part contrôlent l’activité de neurones à ocytocine libérant la molécule dans la circulation sanguine. Notre étude sur la séparation maternelle démontre qu’elle induit une hypersensibilité à la douleur à l’âge adulte et un dysfonctionnement de l’analgésie endogène ocytocinergique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Oxytocin is a small peptide synthesized in hypothalamic neurons. She is well known for its roles in reproduction and social interactions, especially in mother-infant interactions, but also displays analgesic effects. During this thesis, I tried to get a better understanding of the circuits underlying OT analgesia. Then, I tried to determine if neonatal maternal separation, affecting mother-infant interactions, alters adult pain responses and oxytocin analgesia. This work allowed to identify a subgroup of oxytocinergic neurons in the hypothalamus, able to decrease pain through a dual action. They directly inhibit nociceptive transmission in the spinal cord and control the activity of another population of oxytocinergic neurons releasing the peptide in the bloodstream. Our work on maternal separation shows that it induces nociceptive hypersensitivity at adulthood, and a dysfunction in oxytocin analgesia.</dcterms:abstract>
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