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<dc:title xml:lang="en">Impact of the hair follicle cycle on Langerhans cell homeostasis</dc:title>
<dcterms:alternative xml:lang="fr">Impact du cycle pileux sur l'homéostasie des cellules de Langerhans</dcterms:alternative>
<dc:subject xml:lang="fr">Cellules de Langerhans</dc:subject>
<dc:subject xml:lang="fr">Cycle pileux</dc:subject>
<dc:subject xml:lang="fr">Cellules dendritiques cutanées</dc:subject>
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<tef:elementdEntree autoriteExterne="102488630" autoriteSource="Sudoc">Follicule du poil</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">Le follicule pileux (FP) est un appendice cutané animé par un cycle régénératif dynamique provoquant des modifications de son microenvironnement. Les cellules de Langerhans (CLs), sentinelles de l’épiderme, sont en partie localisées à proximité du FP. Cette association spatiale nous a conduit à explorer le possible impact du cycle pileux sur l’homéostasie des CLs. Durant mon doctorat, nous avons mis en évidence (1) une augmentation de la prolifération des CLs au cours de l’anagène (phase de pousse du poil), (2) le mécanisme moléculaire sous-jacent impliquant une variation d’expression folliculaire de l’IL-34, une cytokine cruciale dans l’homéostasie des CLs et (3) un départ accru des CLs vers les ganglions lymphatiques en catagène (phase de régression du FP) concomitant avec le recrutement de cellules susceptibles d’être des précurseurs des CLs.Par ailleurs, la structure de la peau ainsi que la densité et le type de FP peuvent varier selon la région corporelle considérée. Nous avons émis l’hypothèse de variations locales dans la composition du système immunitaire cutané. Notre étude, focalisée sur les cellules dendritiques cutanées, a démontré l’existence d’une hétérogénéité de ces cellules en fonction de la zone de peau considérée.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The hair follicle (HF) is a skin appendage endowed with a dynamic regenerating cycle. This renewal remodels the HF microenvironment. Langerhans cells (LCs) are epidermal immune sentinels, a part of which localizes close to the HF. This spatial association led us to explore whether the HF cycle could impact on LC homeostasis. During my doctorate, we uncovered an anagen (HF growing phase)-associated burst of LC proliferation with dividing cells associated with the HF. Using mouse models of HF loss and hair cycle manipulation, we showed that HFs are dispensable for initial formation of the LC network but critical for the proliferation burst. We correlated it to a cyclic variation of IL-34 expression, a crucial cytokine for LC homeostasis, by a specific subset of HF cells. In addition, catagen (HF regression phase) is characterized by the departure of LCs to draining lymph nodes and the concomitant recruitment of a potential LC precursor.The skin structure as well as the density and type of HFs vary across body areas. This observation led us to assess the possibility of local variations in skin immune cells composition. Our study, focused on cutaneous dendritic cells, highlighted an heterogeneity in those cells according to the skin area considered.</dcterms:abstract>
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