[HTML][HTML] Environmental cues regulate epigenetic reprogramming of airway-resident memory CD8+ T cells

SL Hayward, CD Scharer, EK Cartwright… - Nature …, 2020 - nature.com
SL Hayward, CD Scharer, EK Cartwright, S Takamura, ZRT Li, JM Boss, JE Kohlmeier
Nature immunology, 2020nature.com
Tissue-resident memory T cells (TRM cells) are critical for cellular immunity to respiratory
pathogens and reside in both the airways and the interstitium. In the present study, we found
that the airway environment drove transcriptional and epigenetic changes that specifically
regulated the cytolytic functions of airway TRM cells and promoted apoptosis due to amino
acid starvation and activation of the integrated stress response. Comparison of airway TRM
cells and splenic effector-memory T cells transferred into the airways indicated that the …
Abstract
Tissue-resident memory T cells (TRM cells) are critical for cellular immunity to respiratory pathogens and reside in both the airways and the interstitium. In the present study, we found that the airway environment drove transcriptional and epigenetic changes that specifically regulated the cytolytic functions of airway TRM cells and promoted apoptosis due to amino acid starvation and activation of the integrated stress response. Comparison of airway TRM cells and splenic effector-memory T cells transferred into the airways indicated that the environment was necessary to activate these pathways, but did not induce TRM cell lineage reprogramming. Importantly, activation of the integrated stress response was reversed in airway TRM cells placed in a nutrient-rich environment. Our data defined the genetic programs of distinct lung TRM cell populations and show that local environmental cues altered airway TRM cells to limit cytolytic function and promote cell death, which ultimately leads to fewer TRM cells in the lung.
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