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


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-?, 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.

SUBMITTER: Cheuk S 

PROVIDER: S-EPMC5337619 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature

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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<sup>+</sup> Trm cells on a compartmental and functional basis. In human skin epithelia, CD8<sup>+</sup>CD49a<sup>+</sup> Trm cells produced interferon-γ, whereas CD8<sup>+</sup>CD49a<sup>-</sup> Trm cells produced interleukin-17 (IL-17). In addition, CD8<sup>+</sup>CD49a<sup>+</sup> Trm cells from healthy skin rapid  ...[more]

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