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<dc:title xml:lang="fr">Inflammation cutanée et borréliose de Lyme : étude in vitro des interactions entre les cellules résidentes de la peau et Borrelia</dc:title>
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<dc:subject xml:lang="fr">Immunité innée cutanée</dc:subject>
<dc:subject xml:lang="fr">Borréliose de lyme</dc:subject>
<dc:subject xml:lang="fr">Cellules résidentes de la peau</dc:subject>
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<dc:subject xml:lang="fr">Peptides antimicrobiens</dc:subject>
<dc:subject xml:lang="fr">Salive de tique</dc:subject>
<dc:subject xml:lang="en">Cutaneous innate immunity</dc:subject>
<dc:subject xml:lang="en">Lyme borreliosis</dc:subject>
<dc:subject xml:lang="en">Skin resident cells</dc:subject>
<dc:subject xml:lang="en">Keratinocytes</dc:subject>
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<dcterms:abstract xml:lang="fr">Nous avons étudié le rôle de l'immunité innée de la peau lors de la transmission des Borrelia (agent infectieux de la borréliose de Lyme) par son vecteur, une tique dure du genre Ixodes. Nous avons montré que la salive de tique et la protéine salivaire Salp15 inhibent la réaction inflammatoire (production de chimiokines et de peptides antimicrobiens) des kératinocytes induite par Borrelia. Cet effet anti- « alarmine » de la salive de tique contribue probablement à créer un environnement cutané local favorable à la transmission de Borrelia. Nous avons montré que Borrelia induit également au niveau des fibroblastes cutanés la transcription de nombreux gènes proinflammatoires. Nous avons observé un effet toxique direct de la salive de tique sur les fibroblastes cutanés : cet effet dose-dépendant est de nature protéique mais non lié à la protéine Salp15. Ces résultats indiquent que les fibroblastes jouent un rôle important dans l’inflammation cutanée induite par Borrelia.</dcterms:abstract>
<dcterms:abstract xml:lang="en">We studied the role of the skin innate immunity during the transmission of Borrelia (the infectious agent of Lyme borreliosis) by its vector, a hard tick belonging to the genus Ixodes. We showed that tick saliva and its protein Salp15 both inhibate Borrelia-induced inflammatory reaction of keratinocytes. The antialarmin effect of tick saliva ensure a favorable environment for Borrelia. We also showed that Borrelia induce a strong inflammatory response in dermal fibroblasts. We also demonstrate a dose-dependent lytic effect of tick salivary gland extracts on dermal fibroblasts and that this cytotoxic effect was of proteinaceous nature and not related to Salp15. These results indicate that dermal fibroblasts could be considered as central mediators in immune cell recruitment to the skin site of Borrelia invasion.</dcterms:abstract>
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