Developing human fetal skin demonstrates a unique lymphocyte signature
Dhariwala, M. O.; Karthikeyan, D.; Vasquez, K. S.; Farhat, S.; Taravati, K.; Leitner, E. G.; Pauli, M.; Lowe, M. M.; Rosenblum, M. D.; Scharschmidt, T. C.
Show abstract
Lymphocytes in barrier tissues play critical roles in host defense and homeostasis. These cells take up residence in tissues during defined developmental windows, when they may demonstrate distinct phenotypes and functions. Here, we utilized mass and flow cytometry to elucidate early features of human skin immunity, demonstrating a unique fetal skin lymphocyte signature. While most conventional {beta} T (Tconv) cells in fetal skin have a naive, proliferative phenotype, a subset of CD4+ Tconv and CD8+ cells demonstrate memory-like features and a propensity for IFN{gamma} production. Skin regulatory T cells dynamically accumulate over the second trimester in temporal and regional association with hair follicle development. These fetal skin Tregs demonstrate an effector memory phenotype while differing from their adult counterparts in expression of key effector molecules. Thus, we identify features of prenatal skin lymphocytes that may have key implications for understanding antigen and allergen encounters in utero and in infancy.
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