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The tissue-resident regulatory T cell pool is shaped by transient multi-tissue migration and a conserved residency

Oliver T Burton1, Orian Bricard2, Samar Tareen2

  • 1Department of Pathology, University of Cambridge, Cambridge, UK; VIB Center for Brain and Disease Research, Leuven, Belgium; KU Leuven, University of Leuven, Department of Microbiology and Immunology, Leuven, Belgium; Babraham Institute, Babraham Research Campus, Cambridge, UK.

Immunity
|June 19, 2024
PubMed

The tissues are the site of many important immunological reactions, yet how the immune system is controlled at these sites remains opaque. Recent studies have identified Foxp3+ regulatory T (Treg) cells in non-lymphoid tissues with unique characteristics compared with lymphoid Treg cells. However, tissue Treg cells have not been considered holistically across tissues. Here, we performed a systematic analysis of the Treg cell population residing in non-lymphoid organs throughout the body, revealing shared phenotypes, transient residency, and common molecular dependencies. Tissue Treg cells from different non-lymphoid organs shared T cell receptor (TCR) sequences, with functional capacity to drive multi-tissue Treg cell entry and were tissue-agnostic on tissue homing. Together, these results demonstrate that the tissue-resident Treg cell pool in most non-lymphoid organs, other than the gut, is largely constituted by broadly self-reactive Treg cells, characterized by transient multi-tissue migration. This work suggests common regulatory mechanisms may allow pan-tissue Treg cells to safeguard homeostasis across the body.

Keywords:
T cell receptorimmunologyregulatory T cellstissue immunology

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