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<dc:title xml:lang="fr">Implication des récepteurs à peptides RF-amide dans la modulation de la douleur et de l'hyperalgésie induite par les opiacés</dc:title>
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<dc:subject xml:lang="fr">Douleur</dc:subject>
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<dc:subject xml:lang="fr">Hyperalgésie induite par les opiacés</dc:subject>
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<dc:subject xml:lang="en">Opioid-induced hyperalgesia</dc:subject>
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<dcterms:abstract xml:lang="fr">La douleur est un problème de santé publique majeur qui réduit la qualité de vie des patients et engendre un coût élevé pour la société. Malgré les efforts fournis pour développer de nouveaux analgésiques, les opiacés restent le moyen le plus efficace pour réduire la douleur moyenne à intense. Cependant, leur utilisation prolongée est responsable du développement d’une tolérance à leurs effets analgésiques et d’une hypersensibilité à la douleur (hyperalgésie). Il a été proposé que ces phénomènes pourraient résulter de l'activation d’un système anti-opioïde tel que celui des récepteurs RF-amide, mais leurs mécanismes d’action sont encore mal compris. L'objectif de ce projet a ainsi été d'étudier l'implication des récepteurs RF-amide NPFFR1, NPFFR2 et GPR103a dans le développement de l'hyperalgésie induite par les opiacés. Allant du niveau cellulaire, en s’intéressant à l’expression des ARNm, à la modulation de l’activité neuronale induite par le 26RFa, jusqu’à un niveau plus intégré via une approche in vivo et l’étude des seuils nociceptifs et de la douleur chez la souris ; ce travail a permis d’avoir une vision globale des effets du système RF-amide et principalement de GPR103a. En abordant la question des effets secondaires associés aux traitements chroniques opiacés, ce projet pourrait conduire à l'élaboration de stratégies de traitement de la douleur prometteuses.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Pain is a major health problem that reduces quality of life and imparts high social and economic costs. Despite efforts to develop new analgesics, opiates remain the most effective way to reduce severe pain. However, their prolonged use is associated with the development of analgesic tolerance and hypersensitivity to pain (hyperalgesia). It has been proposed that these phenomena would result from the activation of anti-opioid system like RF-amide receptors system, but their mechanism of action is still poorly understood. The objective of this project was to study the involvement of NPFFR1, NPFFR2 and GPR103a receptors in the development of opioidinduced hyperalgesia. This work gave an overall view of the effects of the RF-amide system and mainly of GPR103a, ranging from the cellular level, to the expression of mRNAs, to the modulation of the 26RFa-induced neuronal activity, up to an integrated level via an in vivo approach and the study of nociceptive thresholds and pain in mice. By addressing the issue of side effects associated with opioid chronic treatments, this project may lead to the development of promising strategies for pain treatment.</dcterms:abstract>
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