Abstract
Langerhans cells (LCs) are a specialized dendritic cell subset that resides in the epidermis and mucosal epithelia and is critical for the orchestration of skin immunity. Recent evidence suggest that LCs are involved in aberrant wound healing and in the development of hypertrophic scars and chronic wounds, which are characterized by a hypoxic environment. Understanding LCs biology under hypoxia may, thus, lead to the identification of novel pathogenetic mechanisms of wound repair disorders and open new therapeutic opportunities to improve wound healing. In this study, we characterize a previously unrecognized role for hypoxia in significantly affecting the phenotype and functional properties of human monocyte-derived LCs, impairing their ability to stimulate naive T cell responses, and identify the triggering receptor expressed on myeloid (TREM)-1, a member of the Ig immunoregulatory receptor family, as a new hypoxia-inducible gene in LCs and an activator of their proinflammatory and Th1-polarizing functions in a hypoxic environment. Furthermore, we provide the first evidence of TREM-1 expression in vivo in LCs infiltrating hypoxic areas of active hypertrophic scars and decubitous ulcers, pointing to a potential pathogenic role of this molecule in wound repair disorders.
Key messages
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Hypoxia modulates surface molecule expression and cytokine profile in Langerhans cells.
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Hypoxia impairs human Langerhans cell stimulatory activity on naive T cells.
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Hypoxia selectively induces TREM-1 expression in human Langerhans cells.
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TREM-1 engagement stimulates Langerhans cell inflammatory and Th1-polarizing activity.
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TREM-1 is expressed in vivo in Langerhans cells infiltrating hypoxic skin lesions.
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Acknowledgments
This work was supported by grants from the: Italian Association for Cancer Research IG codes 10565 (to LV), 9366 (to MG), 15257, and 121825 (funding source 5 × mille) (to FN); Italian Ministry of Health (to MCB); Fondazione Cariplo 2011-0463 (to FN); European Network for Cancer Research in Children and Adolescents (ENCCA) (to LV); Fondazione Umberto Veronesi (to LV); Fondazione Ricerca Molinette Onlus (to FN); Compagnia San Paolo (Progetti di Ricerca Ateneo) (to CC and FN); University of Torino (research funds ex 60 %) (to MG and TM); Fondazione CRT (to CC); Piedmont Foundation of Studies and Research on Burns Simone Teich Alasia (to CC). Daniele Pierobon was supported by a fellowship from the Fondazione Angela Bossolasco.
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Blood monocytes and naive T cells were purified from platelet-apheresis of healthy donors obtained by the Blood Transfusion Center of the Gaslini Institute (Genova, Italy) according to the Gaslini’s Ethics Committee-approved protocol. Skin biopsies were obtained from six patients with postburn active hypertrophic scars (AHT), three with decubitus ulcers (U) and four healthy individuals undergoing plastic surgery or scar correction procedures, according to a protocol approved by the CTO/Città della Salute e della Scienza Hospital Ethical Board (Torino, Italy) and in adherence with the Declaration of Helsinki Principles. Written informed consent was obtained from all subjects enrolled in the study.
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Maria Carla Bosco and Mirella Giovarelli share senior authorship
Daniele Pierobon and Federica Raggi contributed equally to this work.
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Pierobon, D., Raggi, F., Cambieri, I. et al. Regulation of Langerhans cell functions in a hypoxic environment. J Mol Med 94, 943–955 (2016). https://doi.org/10.1007/s00109-016-1400-9
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DOI: https://doi.org/10.1007/s00109-016-1400-9