Functional Langerin high -Expressing Langerhans-like Cells Can Arise from CD14 high CD16 − Human Blood Monocytes in Serum-Free Condition

Abstract : Langerhans cells (LCs) are epithelial APCs that sense danger signals and in turn trigger specific immune responses. In steady-state, they participate in the maintenance of peripheral tolerance to self-antigens whereas under inflammation LCs efficiently trigger immune responses in secondary lymphoid organs. It has been demonstrated in mice that LC-deprived epithelia are rapidly replenished by short half-life langerin-expressing monocyte-derived LCs (MDLCs). These surrogate LCs are thought to be progressively replaced by langerinhigh LCs arising from self-renewing epithelial precursors of hematopoietic origin. How LCs arise from blood monocytes is not fully understood. Hence, we sought to characterize key factors that induce differentiation of langerinhigh-expressing monocyte-derived Langerhans-like cells. We identified GM-CSF and TGF-b1 as key cytokines to generate langerinhigh-expressing cells but only in serum-free conditions. These cells were shown to express the LC-specific TROP-2 and Axl surface markers and contained Birbeck granules. Surprisingly, E-cadherin was not spontaneously expressed by these cells but required a direct contact with keratinocytes to be stably induced. MDLCs induced stronger allogeneic T cell proliferations but released low amounts of inflammatory cytokines upon TLR stimulation compared with donor-paired monocyte-derived dendritic cells. Immature langerinhigh MDLCs were responsive to MIP-3b/CCL20 and CTAC/CCL27 chemokine stimulations. Finally, we demonstrated that those cells behaved as bona fide LCs when inserted in a three-dimensional rebuilt epithelium by becoming activated upon TLR or UV light stimulations. Collectively, these results prompt us to propose these langerinhigh MDLCs as a relevant model to address LC biology–related questions.
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Gaëlle Picarda, Coraline Chéneau, Jean-Marc Humbert, Gaëlle Bériou, Paul Pilet, et al.. Functional Langerin high -Expressing Langerhans-like Cells Can Arise from CD14 high CD16 − Human Blood Monocytes in Serum-Free Condition. Journal of Immunology, Publisher : Baltimore : Williams & Wilkins, c1950-. Latest Publisher : Bethesda, MD : American Association of Immunologists, 2016, 196 (9), pp.3716-3728. ⟨10.4049/jimmunol.1501304⟩. ⟨inserm-02150898⟩

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