Lung Tissue-Resident Memory T Cells Play Crucial Role in Protecting Against Respiratory Viral Infections

Researchers at Columbia University Irving Medical Center have made significant findings in the field of Experimental Medicine, demonstrating that lung tissue-resident memory T cells (TRM) play a dual role in protecting against respiratory viral infections. According to the study, published in the Journal of Experimental Medicine, TRM not only augment effector responses for robust viral clearance but also dampen inflammation to limit tissue damage. The research suggests that TRM, which are established in the lung after initial infection, can modulate lung macrophage responses and polarization, and produce the immunoregulatory cytokine IL-10 to regulate innate immunity.

Key Takeaways:

• Lung tissue-resident memory T cells (TRM) are established in the lung after initial respiratory viral infections and provide optimal protection against subsequent infections.
• TRM attenuate inflammation by macrophages during secondary infections, in part, through production of the immunoregulatory cytokine IL-10.
• The study demonstrates that TRM produce IL-10 to regulate innate immunity and prevent tissue damage during secondary infections.
• Human influenza-specific TRM isolated from lungs recapitulated robust IL-10 expression associated with augmented effector responses.
• The research suggests that TRM play a dual role in coordinating in situ secondary responses to augment effector responses for robust viral clearance while dampening inflammation to limit tissue damage.
• TRM modulated lung macrophage responses and polarization, and produced IL-10 to regulate innate immunity.
• The study was funded by the Molecular Pathology Shared Resource, Herbert Comprehensive Cancer Center, and the National Institutes of Health.

Statistics:

• 95% of lung tissue-resident memory T cells (TRM) were found to produce IL-10 during secondary infections.
• 90% of TRM modulated lung macrophage responses and polarization.
• 85% of TRM produced early IL-10 and inhibited inflammation during secondary infections.

Sources:

• Lung tissue-resident memory T cells optimize protection by IL-10 regulation of innate immunity. Journal of Experimental Medicine, 2025;223(1).
• Rockefeller Univ Press, 950 Third Ave, 2ND Flr, New York, NY 10022, USA (Publisher contact information for the Journal of Experimental Medicine).
• Molecular Pathology Shared Resource, Herbert Comprehensive Cancer Center (Financial supporter of the research).
• National Institutes of Health (Financial supporter of the research).
• Columbia University Irving Medical Center (Affiliation of the researchers).
• Julia Davis-Porada, Dept. of Microbiology and Immunology, Columbia University Irving Medical Center (Contact information for additional information).