Human epidermal Langerhans cells maintain immune homeostasis in skin by activating skin resident regulatory T cells.

Human epidermal Langerhans cells maintain immune homeostasis in skin by activating skin resident regulatory T cells.
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DOI:
10.1016/j.immuni.2012.03.018
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发表时间:
2012-05-25
期刊:
影响因子:
32.4
通讯作者:
Kupper TS
Kupper TS
中科院分区:
医学1区
文献类型:
--
作者:
Seneschal J;Clark RA;Gehad A;Baecher-Allan CM;Kupper TS

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最近的发现表明,正常人的皮肤含有 10-200 亿个常驻记忆 T 细胞(其中包括各种辅助性 T 细胞、细胞毒性 T 细胞和调节性 T 细胞亚群,它们随时准备对环境抗原做出反应。) 调节性 T 细胞 (Treg),皮肤常驻记忆 T 细胞的一小部分。然而,在存在外来病原体的情况下,相同的 LC 会激活并诱导效应记忆 T (Tem) 细胞增殖,并限制 Treg 细胞的激活。 LC 的这些未被充分认识的特性:即维持正常皮肤的耐受性,以及在受到感染时激活保护性皮肤驻留记忆 T 细胞,有助于阐明 LC 在皮肤中的作用。
Recent discoveries indicate that the skin of a normal individual contains 10-20 billion resident memory T cells ( which include various T helper, T cytotoxic, and T regulatory subsets, that are poised to respond to environmental antigens. Using only autologous human tissues, we report that both in vitro and in vivo, resting epidermal Langerhan cells (LC) selectively and specifically induced the activation and proliferation of skin resident regulatory T cells (Treg), a minor subset of skin resident memory T cells. In the presence of foreign pathogen, however, the same LC activated and induced proliferation of effector memory T (Tem) cells and limited Treg cells activation. These underappreciated properties of LC: namely maintenance of tolerance in normal skin, and activation of protective skin resident memory T cells upon infectious challenge, help clarify the role of LC in skin.
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