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Immune signatures underlying post-acute COVID-19 lung sequelae
I S Cheon1,2, C Li1,2, Y M Son1,2
1Division of Pulmonary and Critical Medicine, Department of Medicine, Mayo Clinic, Rochester, MN 55905, USA.
Long COVID survivors show lasting immune changes in the lungs, with specific T cell responses linked to impaired lung function after severe COVID-19 pneumonia. These findings offer insights into chronic respiratory symptoms.
Area of Science:
- Immunology
- Pulmonology
- Virology
Background:
- Severe COVID-19 pneumonia can lead to long-term lung damage (pulmonary sequelae).
- The mechanisms and immune factors driving these chronic lung issues remain unclear.
Purpose of the Study:
- To characterize the immune and pathophysiological traits in aged COVID-19 convalescents.
- To correlate local and systemic immune profiles with lung function and imaging.
Main Methods:
- High-dimensional characterization of immune and pathophysiological traits.
- Analysis of local (lung) and systemic (blood) immune cell populations.
- Single-cell transcriptomic analysis of respiratory CD8+ T cells.
Main Results:
- Chronic lung impairment is associated with persistent respiratory immune alterations.
- Functional SARS-CoV-2-specific memory T and B cells are more abundant in the lungs than in blood.
- Dysregulated respiratory CD8+ T cell responses correlate with reduced lung function post-COVID-19.
Conclusions:
- Specific CD8+ T cell subsets in the lungs may contribute to persistent tissue damage after COVID-19.
- Identified immune traits may explain lung sequelae in older individuals after SARS-CoV-2 pneumonia.
- Findings may inform treatments for chronic COVID-19 symptoms.
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