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<dc:title xml:lang="en">Spinal cholinergic system and chronic pain</dc:title>
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<dc:subject xml:lang="fr">Moelle épinière</dc:subject>
<dc:subject xml:lang="fr">Corne Dorsale</dc:subject>
<dc:subject xml:lang="fr">Neuropathique</dc:subject>
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<dc:subject xml:lang="fr">Acétylcholine</dc:subject>
<dc:subject xml:lang="fr">Seuils mécanique</dc:subject>
<dc:subject xml:lang="fr">Transmission synaptique</dc:subject>
<dc:subject xml:lang="en">Spinal cord</dc:subject>
<dc:subject xml:lang="en">Dorsal Horn</dc:subject>
<dc:subject xml:lang="en">Neuropathy</dc:subject>
<dc:subject xml:lang="en">Chronic pain</dc:subject>
<dc:subject xml:lang="en">Acetylcholine</dc:subject>
<dc:subject xml:lang="en">Mechanical thresholds</dc:subject>
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<tef:elementdEntree autoriteExterne="031368018" autoriteSource="Sudoc">Récepteurs cholinergiques</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Chez les rongeurs et humains, un « tonus » cholinergique spinal endogène modulant les comportements nociceptifs (douloureux) a été décrit. Une source potentielle de cette acétylcholine sont les interneurones cholinergiques de la corne dorsale (CD) de la moelle épinière. Nos objectifs étaient les suivants : (1) caractériser le « tonus » cholinergique spinal responsable de l’établissement des seuils mécaniques nociceptifs et (2) élucider le rôle des neurones cholinergiques CD dans la modulation de l'information sensorielle chez des animaux naïfs et neuropathiques. Nous avons confirmé la présence d'un « tonus » cholinergique qui module les seuils mécaniques et démontré qu'il est encore présent, bien qu'il soit modifié, après une neuropathie. Les interneurones cholinergiques reçoivent des entrées excitatrices localisées sur des segments plus distants et reçoivent généralement une faible fréquence d’entrées inhibitrices. De plus, ils sont indirectement reliés par des afférences primaires nociceptives qui expriment TRPV1, ce qui démontre leur implication dans le circuit nociceptif. Dans les conditions neuropathiques, les entrées des neurones LIII / IV ne sont pas affectées après une lésion du nerf périphérique. Une meilleure compréhension du système cholinergique spinal peut ouvrir la voie à une thérapie alternative contre la douleur.</dcterms:abstract>
<dcterms:abstract xml:lang="en">An endogenous spinal cholinergic tone modulating nociceptive (pain­like) behaviors has been demonstrated in rodents and humans. One potential source of this acetylcholine is the spinal Dorsal Horn (DH) cholinergic interneurons. Our objectives were to: (1) characterize the spinal cholinergic tone establishing mechanical nociceptive thresholds and (2) to elucidate the role of DH cholinergic neurons in the modulation of sensory information of naïve and neuropathic animals. We have confirmed the presence of a cholinergic tone modulating mechanical thresholds and demonstrated that it is still present, although altered, after neuropathy. The DH cholinergic interneurons receive excitatory inputs from distant spinal segments and generally receive lower inhibitory inputs. In addition, they are indirectly connected by a subset of nociceptive primary afferents expressing TRPV1, demonstrating their involvement in nociceptive processing. In neuropathic spinal circuits, the inputs to LIII/IV neurons appears to be unaffected after injury. Better understanding the spinal cholinergic system can pave way to alternative pain therapy.</dcterms:abstract>
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