Immunity
Volume 48, Issue 2, 20 February 2018, Pages 327-338.e5
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Article
T Cells in Nonlymphoid Tissues Give Rise to Lymph-Node-Resident Memory T Cells

https://doi.org/10.1016/j.immuni.2018.01.015Get rights and content
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Highlights

  • Expression of CD69 by T cells is insufficient to infer stable residence

  • CD8+ SLO Trm cells partly share nonlymphoid Trm cell transcriptional and phenotypic signatures

  • SLO Trm cells derive from T cells that exit nonlymphoid tissues

  • Memory can be biased to specific LNs by residence and after local reimmunization

Summary

Immunosurveillance of secondary lymphoid organs (SLO) is performed by central memory T cells that recirculate through blood. Resident memory T (Trm) cells remain parked in nonlymphoid tissues and often stably express CD69. We recently identified Trm cells within SLO, but the origin and phenotype of these cells remains unclear. Using parabiosis of “dirty” mice, we found that CD69 expression is insufficient to infer stable residence of SLO Trm cells. Restimulation of nonlymphoid memory CD8+ T cells within the skin or mucosa resulted in a substantial increase in bona fide Trm cells specifically within draining lymph nodes. SLO Trm cells derived from emigrants from nonlymphoid tissues and shared some transcriptional and phenotypic signatures associated with nonlymphoid Trm cells. These data indicate that nonlymphoid cells can give rise to SLO Trm cells and suggest vaccination strategies by which memory CD8+ T cell immunosurveillance can be regionalized to specific lymph nodes.

Keywords

resident memory T cells
secondary lymphoid organs
non-lymphoid tissue
local recall immunization
regionalized immunosurveillance

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Present address: Department of Pathology, Brigham and Women’s Hospital, Boston, MA 02115, USA

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