Susceptibility to COPD: differential proteomic profiling after acute smoking

Area of Science:

• Pulmonary Medicine
• Proteomics
• Molecular Biology

Background:

• Cigarette smoking is the primary risk factor for Chronic Obstructive Pulmonary Disease (COPD).
• Only a subset of smokers develops COPD, suggesting genetic susceptibility.
• Family history of severe COPD indicates increased risk and defines
• susceptible individuals

Purpose of the Study:

• To investigate differential proteomic responses to smoking in individuals susceptible versus non-susceptible to COPD.
• To compare these responses with those in established COPD patients.
• To identify potential biomarkers for COPD development.

Main Methods:

• Unbiased proteomic profiling of epithelial lining fluid (ELF) using stable isotope labeling (iTRAQ).
• Collection of ELF from young susceptible, young non-susceptible individuals, and older COPD patients, before and after smoking.
• Validation of selected proteins by ELISA and immunohistochemistry.

Main Results:

• Acute smoking induced differential protein expression changes in ELF of young susceptible and non-susceptible individuals.
• Specific proteins like SerpinB3 and Uteroglobin showed unique changes in non-susceptible individuals.
• Proteins such as Peroxiredoxin I, S100A9, S100A8, and ALDH3A1 were altered in both susceptible and non-susceptible groups, with significant inter-group differences.
• COPD patients exhibited distinct protein changes (Peroxiredoxin I, SerpinB3, ALDH3A1) post-smoking.

Conclusions:

• Smoking elicits a distinct proteomic response in the airways of individuals predisposed to COPD.
• These responses differ significantly from those observed in established COPD.
• SerpinB3 and Uteroglobin are identified as potential key players in the early mechanisms of COPD development.