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CD49a Expression Defines Tissue-Resident CD8+ T Cells Poised for Cytotoxic Function in Human Skin

  • Stanley Cheuk
  • , Heinrich Schlums
  • , Irène Gallais Sérézal
  • , Elisa Martini
  • , Samuel C. Chiang
  • , Nicole Marquardt
  • , Anna Gibbs
  • , Ebba Detlofsson
  • , Andrea Introini
  • , Marianne Forkel
  • , Charlotte Höög
  • , Annelie Tjernlund
  • , Jakob Michaelsson
  • , Lasse Westergaard Folkersen
  • , Jenny Mjösberg
  • , Lennart Blomqvist
  • , Marcus Ehrström
  • , Mona Ståhle
  • , Yenan T. Bryceson
  • , Liv Eidsmo
    • Karolinska Institutet
    • Karolinska University Hospital
    • University of Bergen

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    Tissue-resident memory T (Trm) cells form a heterogeneous population that provides localized protection against pathogens. Here, we identify CD49a as a marker that differentiates CD8+ Trm cells on a compartmental and functional basis. In human skin epithelia, CD8+CD49a+ Trm cells produced interferon-γ, whereas CD8+CD49a− Trm cells produced interleukin-17 (IL-17). In addition, CD8+CD49a+ Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response. In skin from patients with vitiligo, where melanocytes are eradicated locally, CD8+CD49a+ Trm cells that constitutively expressed perforin and granzyme B accumulated both in the epidermis and dermis. Conversely, CD8+CD49a– Trm cells from psoriasis lesions predominantly generated IL-17 responses that promote local inflammation in this skin disease. Overall, CD49a expression delineates CD8+ Trm cell specialization in human epithelial barriers and correlates with the effector cell balance found in distinct inflammatory skin diseases.
    Original languageEnglish
    JournalImmunity
    Volume46
    Issue number2
    Pages (from-to)287-300
    ISSN1074-7613
    DOIs
    Publication statusPublished - 2017

    Bibliographical note

    Open Access funded by European Research Council
    Under a Creative Commons license

    UN SDGs

    This output contributes to the following UN Sustainable Development Goals (SDGs)

    1. SDG 3 - Good Health and Well-being
      SDG 3 Good Health and Well-being

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