Hair follicle-derived IL-7 and IL-15 mediate skin-resident memory T cell homeostasis and lymphoma

Takeya Adachi, Tetsuro Kobayashi, Eiji Sugihara, Taketo Yamada, Koichi Ikuta, Stefania Pittaluga, Hideyuki Saya, Masayuki Amagai, Keisuke Nagao

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80 Citations (Scopus)

Abstract

The skin harbors a variety of resident leukocyte subsets that must be tightly regulated to maintain immune homeostasis. Hair follicles are unique structures in the skin that contribute to skin dendritic cell homeostasis through chemokine production. We demonstrate that CD4 + and CD8 + skin-resident memory T cells (T RM cells), which are responsible for long-term skin immunity, reside predominantly within the hair follicle epithelium of the unperturbed epidermis. T RM cell tropism for the epidermis and follicles is herein termed epidermotropism. Hair follicle expression of IL-15 was required for CD8 + T RM cells, and IL-7 for CD8 + and CD4 + T RM cells, to exert epidermotropism. A lack of either cytokine in the skin led to impaired hapten-induced contact hypersensitivity responses. In a model of cutaneous T cell lymphoma, epidermotropic CD4 + T RM lymphoma cell localization depended on the presence of hair follicle-derived IL-7. These findings implicate hair follicle-derived cytokines as regulators of malignant and non-malignant T RM cell tissue residence, and they suggest that the cytokines may be targeted therapeutically in inflammatory skin diseases and lymphoma.

Original languageEnglish
Pages (from-to)1272-1279
Number of pages8
JournalNature Medicine
Volume21
Issue number11
DOIs
Publication statusPublished - 2015 Nov 1

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Adachi, T., Kobayashi, T., Sugihara, E., Yamada, T., Ikuta, K., Pittaluga, S., Saya, H., Amagai, M., & Nagao, K. (2015). Hair follicle-derived IL-7 and IL-15 mediate skin-resident memory T cell homeostasis and lymphoma. Nature Medicine, 21(11), 1272-1279. https://doi.org/10.1038/nm.3962