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SMAD4 and TGFβ are architects of inverse genetic programs during fate determination of antiviral CTLs

Transforming growth factor β (TGFβ) is an important differentiation factor for cytotoxic T lymphocytes (CTLs) and alters the expression levels of several of homing receptors during infection. SMAD4 is part of the canonical signaling network used by members of the transforming growth factor family. F...

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Published in:eLife 2022-08, Vol.11
Main Authors: Chandiran, Karthik, Suarez-Ramirez, Jenny E, Hu, Yinghong, Jellison, Evan R, Ugur, Zeynep, Low, Jun Siong, McDonald, Bryan, Kaech, Susan M, Cauley, Linda S
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container_title eLife
container_volume 11
creator Chandiran, Karthik
Suarez-Ramirez, Jenny E
Hu, Yinghong
Jellison, Evan R
Ugur, Zeynep
Low, Jun Siong
McDonald, Bryan
Kaech, Susan M
Cauley, Linda S
description Transforming growth factor β (TGFβ) is an important differentiation factor for cytotoxic T lymphocytes (CTLs) and alters the expression levels of several of homing receptors during infection. SMAD4 is part of the canonical signaling network used by members of the transforming growth factor family. For this study, genetically modified mice were used to determine how SMAD4 and TGFβ receptor II (TGFβRII) participate in transcriptional programming of pathogen-specific CTLs. We show that these molecules are essential components of opposing signaling mechanisms, and cooperatively regulate a collection of genes that determine whether specialized populations of pathogen-specific CTLs circulate around the body, or settle in peripheral tissues. TGFβ uses a canonical SMAD-dependent signaling pathway to downregulate Eomesodermin (EOMES), KLRG1, and CD62L, while CD103 is induced. Conversely, in vivo and in vitro data show that EOMES, KLRG1, CX 3 CR1, and CD62L are positively regulated via SMAD4, while CD103 and Hobit are downregulated. Intravascular staining also shows that signaling via SMAD4 promotes formation of long-lived terminally differentiated CTLs that localize in the vasculature. Our data show that inflammatory molecules play a key role in lineage determination of pathogen-specific CTLs, and use SMAD-dependent signaling to alter the expression levels of multiple homing receptors and transcription factors with known functions during memory formation.
doi_str_mv 10.7554/eLife.76457
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subjects CD8 memory
CD8 T cell differentiation
CD8 T cells
cytotoxic T lymphocyte
Immunology and Inflammation
SMAD4
TGFβ
title SMAD4 and TGFβ are architects of inverse genetic programs during fate determination of antiviral CTLs
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