CD4+CD8β+ double-positive T cells in skin-draining lymph nodes respond to inflammatory signals from the skin

Nana Haahr Overgaard, Jazmina L. Cruz, Jennifer A. Bridge, Hendrik J. Nel, Ian H. Frazer, Nicole L. La Gruta, Antje Blumenthal, Raymond J. Steptoe, James W. Wells

    Research output: Contribution to journalJournal articleResearchpeer-review


    CD4+CD8+ double-positive (DP), mature, peripheral T cells are readily detectable in a variety of species and tissues. Despite a common association with autoimmune and malignant skin disorders, however, little is understood about their role or function. Herein, we show that DP T cells are readily detectable in the blood, spleen, and peripheral lymph nodes of naïve C57BL/6 mice. DP T cells were also present in Jα-/- and CD1d-/- mice, indicating that these cells are not NK-T cells. After skin administration of CASAC adjuvant, but not Quil A adjuvant, both total DP T cells and skin-infiltrating DP T cells increased in number. We explored the possibility that DP T cells could represent aggregates between CD4+ and CD8+ single-positive T cells and found strong evidence that a large proportion of apparent DP T cells were indeed aggregates. However, the existence of true CD4+CD8+ DP T cells was confirmed by Amnis Image-Stream (Millipore Sigma, Billerica, MA, USA) imaging. Multiple rounds of FACS sorting separated true DP cells from aggregates and indicated that conventional analyses may lead to ~10-fold overestimation of DP T cell numbers. The high degree of aggregate contamination and overestimation of DP abundance using conventional analysis techniques may explain discrepancies reported in the literature for DP T cell origin, phenotype, and function.
    Original languageEnglish
    JournalJournal of Leukocyte Biology
    Issue number3
    Pages (from-to)837-844
    Publication statusPublished - 2017


    • Abundance
    • Adjuvant
    • Aggregates
    • Blood
    • Mouse
    • Spleen


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