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<dc:title xml:lang="en">Neuro-immune mechanisms mediating altered pain processing in a preclinical model of stress-induced potentiation of post-surgical pain</dc:title>
<dcterms:alternative xml:lang="fr">Mécanismes neuro-immuns impliqués dans la prolongation de la douleur post-chirurgicale induite par le stress</dcterms:alternative>
<dc:subject xml:lang="fr">Dépression</dc:subject>
<dc:subject xml:lang="fr">Douleur post-opératoire</dc:subject>
<dc:subject xml:lang="fr">Incision de la patte</dc:subject>
<dc:subject xml:lang="fr">Test de von Frey</dc:subject>
<dc:subject xml:lang="fr">Test de Hargreaves</dc:subject>
<dc:subject xml:lang="fr">Cellules gliales</dc:subject>
<dc:subject xml:lang="fr">Cytokines</dc:subject>
<dc:subject xml:lang="fr">Système neuro-immun</dc:subject>
<dc:subject xml:lang="en">Depression</dc:subject>
<dc:subject xml:lang="en">Post-operative pain</dc:subject>
<dc:subject xml:lang="en">Paw incision</dc:subject>
<dc:subject xml:lang="en">Vonfrey</dc:subject>
<dc:subject xml:lang="en">Hargreaves</dc:subject>
<dc:subject xml:lang="en">Glia</dc:subject>
<dc:subject xml:lang="en">Cytokines</dc:subject>
<dc:subject xml:lang="en">Neuro-immune system</dc:subject>
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<tef:elementdEntree autoriteExterne="031020836" autoriteSource="Sudoc">Douleur postopératoire</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="031020836" autoriteSource="Sudoc">Douleur postopératoire</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le stress préopératoire est un facteur de risque reconnu pour la douleur post-chirurgicale persistante, les interactions neuro-immunes jouant un rôle clé. Nous avons étudié l’effet du stress de contention répété (RRS) chez des rats mâles et son impact sur la douleur post-chirurgicale et les réponses affectives. Le RRS pendant 21 jours, mais non pendant 3 ou 14 jours, a induit un désespoir comportemental, réduit la prise de poids et augmenté les niveaux de corticostérone fécale. Après une incision de la patte, les rats exposés au RRS ont présenté une hypersensibilité mécanique et thermique accrue, une aversion liée à la douleur et un comportement anxieux. L’analyse RNAseq et l’histologie ont révélé une augmentation de l’activité microgliale et de l’expression des gènes inflammatoires (iba1, itgam, il-1β, nlrp3) dans la moelle épinière. Le blocage de l’IL-1β ou l’inhibition de la NLRP3 au niveau spinal ont réduit l’aversion liée à la douleur et l’hypersensibilité. Le RU486 (antagoniste des récepteurs des glucocorticoïdes) a empêché le désespoir induit par le RRS mais non l’exacerbation de la douleur, tandis que le propranolol (bêtabloquant) a prévenu à la fois le désespoir et les modifications liées à la douleur. Ces résultats suggèrent que le stress chronique aggrave la douleur post-chirurgicale via l’activation β-adrénergique et la signalisation microgliale spinaleNLRP3–IL-1β.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Pre-surgical stress is a known risk factor for persistent post-surgical pain, with neuroimmune interactions playing a key role. We examined repeated restraint stress (RRS) in male rats and its effects on post-surgical pain and affective responses. RRS for 21 days, but not 3 or 14, induced behavioural despair, reduced weight gain, and increased faecal corticosterone. After paw incision, RRS-exposed rats showed enhanced mechanical and heat hypersensitivity, pain-related aversion, and anxiety-like behaviour. RNAseq and histology revealed increased microglial activity and inflammatory gene expression (iba1, itgam, il-1β, nlrp3) in the spinal cord. Blocking IL-1β or inhibiting NLRP3 in the spinal cord reduced pain-related aversion and hypersensitivity. RU486 (GluR antagonist) prevented RRS-induced despair but not pain exacerbation, while propranolol (beta-blocker) prevented both despair and pain-related changes. These findings suggest that chronic stress worsens post-surgical pain via β-adrenergic activation and spinal microglial NLRP3–IL-1β signalling.</dcterms:abstract>
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