Abstract
Alopecia areata (AA) is a condition in which hair is lost in small regions or over the entire body. It has a prevalence of 1 in 1000 and has a great impact on psychological wellbeing. AA is generally considered an autoimmune disease in which a collapse of the immune privilege system of the hair follicle has shown to play an important role, potentially driven by interferon gamma (IFN-γ). The most prominent cells located in or around the hair follicle in AA are Langerhans cells, CD4+ or CD8+ T cells, macrophages and mast cells. Langerhans cells, specialized dendritic cells, are resident in the epidermis and are known to associate with hair follicles. Therefore, we aimed to develop in vitro generated Langerhans cells contributing as an in vitro model of disease. In vitro models provide insight into the behaviour of cells and are a valuable tool before being in need of an animal model or patient samples. For this, Langerhans-like cells were generated from CD14+ monocytes in the presence of GM-CSF and TGF-β. After 10 days of cell culture, Langerhans-like cells express CD207 and CD1a but lack CD209 expression as well as Birbeck granules. Next, Langerhans-like cells were exposed to inflammatory conditions and the effect of different AA treatments was investigated. All treatments—diphencyprone contact immunotherapy, UV-B light therapy and JAK-STAT inhibition—affect the expression of costimulatory and skin-homing markers on Langerhans-like cells. Importantly, also the T cell stimulatory capacity of Langerhans-like cells was significantly reduced following treatment under inflammatory conditions. Noteworthy, JAK-STAT inhibition outperformed conventional AA treatments. In conclusion, our findings demonstrate that in vitro generated Langerhans-like cells can be used as a model of disease. Moreover, JAK-STAT inhibition may become a valuable new approach for the treatment of AA.
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We thank the Antwerp Centre for Advanced Microscopy (ACAM) of the University of Antwerp for support with the TEM analysis.
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Conceptualization: A.S. & N.C. Data collection: A.S. Experimental Support: H.DR. & L.V. Data analysis: A.S. & N.C. Writing - original draft preparation: A.S. & N.C. Writing - review and editing: A.S, N.C., I.J. & M.M. Visualization: A.S. & N.C. Supervision: N.C. Funding acquisition: J.L., N.C., A.B. All authors have read and agreed to the published version of the manuscript.
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Ann, S., Ibo, J., Megha, M. et al. Treatment of in vitro generated Langerhans cells with JAK-STAT inhibitor reduces their inflammatory potential. Clin Exp Med 23, 2571–2582 (2023). https://doi.org/10.1007/s10238-022-00899-w
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DOI: https://doi.org/10.1007/s10238-022-00899-w