Regulatory T cells dynamically regulate selectin ligand function during multiple challenge contact hypersensitivity

Latasha Abeynaike, James Antony Deane, Clare Louise Westhorpe, Zachary Chow, Maliha Alikhan, Arthur Richard Kitching, Andrew Issekutz, Michael John Hickey

Research output: Contribution to journalArticleResearchpeer-review

16 Citations (Scopus)

Abstract

Regulatory T cells (Tregs) play critical roles in restricting T cell-mediated inflammation. In the skin, this is dependent on expression of selectin ligands required for leukocyte rolling in dermal microvessels. However, whether there are differences in the molecules used by Tregs and proinflammatory T cells to undergo rolling in the skin remains unclear. In this study, we used spinning disk confocal microscopy in Foxp3-GFP mice to visualize rolling of endogenous Tregs in dermal postcapillary venules. Tregs underwent consistent but low-frequency rolling interactions under resting and inflamed conditions. At the early stage of the response, Treg adhesion was minimal. However, at the peak of inflammation, Tregs made up 40 of the adherent CD4(+) T cell population. In a multiple challenge model of contact hypersensitivity, rolling of Tregs and conventional CD4(+) T cells was mostly dependent on overlapping contributions of P- and E-selectin. However, after a second challenge, rolling of Tregs but not conventional CD4(+) T cells became P-selectin independent, and Tregs showed reduced capacity to bind P-selectin. Moreover, inhibition of E-selectin at this time point resulted in exacerbation of inflammation. These findings demonstrate that in this multiple challenge model of inflammation, Treg selectin binding capacity and the molecular basis of Treg rolling can be regulated dynamically.
Original languageEnglish
Pages (from-to)4934 - 4944
Number of pages11
JournalJournal of Immunology
Volume193
Issue number10
DOIs
Publication statusPublished - 2014

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