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. 2024 Nov 12;57(11):2615-2633.e10.
doi: 10.1016/j.immuni.2024.09.015. Epub 2024 Oct 14.

Retinoic acid and TGF-β orchestrate organ-specific programs of tissue residency

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Retinoic acid and TGF-β orchestrate organ-specific programs of tissue residency

Andreas Obers et al. Immunity. .

Abstract

Tissue-resident memory T (TRM) cells are integral to tissue immunity, persisting in diverse anatomical sites where they adhere to a common transcriptional framework. How these cells integrate distinct local cues to adopt the common TRM cell fate remains poorly understood. Here, we show that whereas skin TRM cells strictly require transforming growth factor β (TGF-β) for tissue residency, those in other locations utilize the metabolite retinoic acid (RA) to drive an alternative differentiation pathway, directing a TGF-β-independent tissue residency program in the liver and synergizing with TGF-β to drive TRM cells in the small intestine. We found that RA was required for the long-term maintenance of intestinal TRM populations, in part by impeding their retrograde migration. Moreover, enhanced RA signaling modulated TRM cell phenotype and function, a phenomenon mirrored in mice with increased microbial diversity. Together, our findings reveal RA as a fundamental component of the host-environment interaction that directs immunosurveillance in tissues.

Keywords: CD8(+) T cells; IEL; T cell memory; TRM cells; dirty mice; mucosal immunity; retinoic acid; tissue-resident memory T cells; transforming growth factor beta.

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Conflict of interest statement

Declaration of interests The authors declare no competing interests.

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