How Innate Immune Mechanisms Contribute to the Chronic Nature of COPD?

Background: Chronic Obstructive Pulmonary Disease (COPD) is characterized by persistent inflammation, airflow limitation, and progressive tissue destruction. While smoking is a major risk factor, recent research links innate immune mechanisms, oxidative stress, and protease imbalances to disease chronicity. Objectives To investigate the involvement of innate immune markers, neutrophil elastase (NE), macrophage elastase (MMP-12), and oxidative stress parameters (MDA and GSH) in COPD patients during acute exacerbations. Methods A case-control study was conducted on 60 participants (30 COPD patients and 30 healthy controls) in Baghdad from May 2024 to February 2025. Serum NE and MMP-12 levels were measured via ELISA. Oxidative stress was assessed through serum malondialdehyde (MDA) and glutathione (GSH) concentrations. Statistical analysis was performed using T-tests and ROC analysis. Results NE and MMP-12 levels were significantly elevated in COPD patients compared to controls (p < 0.0001), supporting their role in disease exacerbation and lung tissue remodeling. MDA levels were markedly higher, while GSH levels were significantly reduced, indicating pronounced oxidative stress and decreased antioxidant capacity. A strong correlation was observed between elevated NE and MMP-12 levels and clinical severity. Conclusion The findings support a crucial role for innate immune dysregulation and oxidative stress in the chronic progression of COPD. NE and MMP-12 may serve as biomarkers for disease activity and potential therapeutic targets in COPD management.