Dermal-Resident versus Recruited gamma delta T Cell Response to Cutaneous Vaccinia Virus Infection

作者：Davis Amanda S Woodward; Berg**aken Tessa; Delaney Martha A; Bevan Michael J^*

来源：The Journal of Immunology, 2015, 194(5): 2260-2267.

DOI：10.4049/jimmunol.1402438

The study of T cell immunity at barrier surfaces has largely focused on T cells bearing the alpha beta TCR. However, T cells that express the gamma delta TCR are disproportionately represented in peripheral tissues of mice and humans, suggesting they too may play an important role responding to external stimuli. In this article, we report that, in a murine model of cutaneous infection with vaccinia virus, dermal gamma delta T cell numbers increased 10-fold in the infected ear and resulted in a novel gamma delta T cell population not found in naive skin. Circulating gamma delta T cells were specifically recruited to the site of inflammation and differentially contributed to dermal populations based on their CD27 expression. Recruited gamma delta T cells, the majority of which were CD27(+), were granzyme B+ and made up about half of the dermal population at the peak of the response. In contrast, recruited and resident gamma delta T cell populations that made IL-17 were CD27(-). Using a double-chimera model that can discriminate between the resident dermal and recruited gamma delta T cell populations, we demonstrated their divergent functions and contributions to early stages of tissue inflammation. Specifically, the loss of the perinatal thymus-derived resident dermal population resulted in decreased cellularity and collateral damage in the tissue during viral infection. These findings have important implications for our understanding of immune coordination at barrier surfaces and the contribution of innate-like lymphocytes on the front lines of immune defense.

• 出版日期2015-3-1