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The inflammasome pathway in stable COPD and acute exacerbations
Rosa Faner1, Patricia Sobradillo2, Aina Noguera3
1Fundació Clinic per a la Recerca Biomèdica, Barcelona, Spain; CIBER Respiratory Diseases (CIBERES), Barcelona, Spain; These authors contributed equally to this work.
ERJ Open Research
|October 13, 2016
Summary
The NLRP3 inflammasome is primed in stable chronic obstructive pulmonary disease (COPD) but activates during infectious exacerbations (ECOPD), suggesting its role in COPD
Area of Science:
- Pulmonology
- Immunology
- Molecular Biology
Background:
- Chronic obstructive pulmonary disease (COPD) involves lung and systemic inflammation, with exacerbations (ECOPD) marked by inflammatory bursts.
- The NLRP3 inflammasome is crucial for inflammation, but its specific role in COPD pathogenesis and exacerbations remains unclear.
Purpose of the Study:
- To investigate the activation status of the NLRP3 inflammasome in lung tissue from stable COPD patients and in sputum/plasma during infectious ECOPD.
- To determine if NLRP3 inflammasome activation correlates with disease severity or exacerbation events.
Main Methods:
- Analysis of NLRP3 inflammasome components (NLRP3, IL-1β, caspase-1, ASC) mRNA and protein in lung tissue from COPD patients, smokers, and controls.
- Assessment of sputum and plasma samples from ECOPD patients during exacerbation and after clinical recovery.
Main Results:
- In stable COPD, NLRP3 and IL-1β mRNA were upregulated in lung tissue, but caspase-1 and ASC remained largely inactive.
- Infectious ECOPD showed significant increases in sputum caspase-1, oligomeric ASC, and associated cytokines (IL-1β, IL-18) compared to recovery states.
- The NLRP3 inflammasome is primed in stable COPD but becomes activated during infectious ECOPD.
Conclusions:
- The NLRP3 inflammasome is primed in the lungs of clinically stable COPD patients.
- Inflammasome activation is a key event during infectious ECOPD, contributing to the inflammatory surge.
- Targeting NLRP3 inflammasome activation may offer therapeutic strategies for managing infectious ECOPD.
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