Metabolomics and transcriptomics pathway approach reveals outcome-specific perturbations in COPD

Area of Science:

• Pulmonary Medicine
• Systems Biology
• Genomics and Metabolomics

Background:

• Chronic obstructive pulmonary disease (COPD) presents diverse phenotypes including airflow obstruction, emphysema, and exacerbations.
• Understanding the underlying molecular mechanisms of COPD phenotypes and outcomes is crucial for effective management.

Purpose of the Study:

• To explore unbiased metabolomics and transcriptomics for identifying biological pathways associated with COPD phenotypes and outcomes.
• To assess the utility of these approaches in a cohort of smokers with and without COPD.

Main Methods:

• Collected blood from 149 current/former smokers, separating plasma and peripheral blood mononuclear cells (PBMC).
• Analyzed PBMCs via microarray and plasma via liquid chromatography-mass spectrometry.
• Mapped significant transcripts and compounds to biological pathways using IMPaLA.

Main Results:

• Glycerophospholipid metabolism correlated with airflow obstruction and COPD exacerbations.
• Sphingolipid metabolism linked to poorer lung function and hospitalization-requiring exacerbation severity.
• Specific pathways like fat digestion, T cell receptor signaling, antigen processing, arginine/proline metabolism, and oxidative phosphorylation showed strong associations with distinct COPD outcomes.

Conclusions:

• Integrated transcriptomic and metabolomic data successfully delineated COPD phenotypic and outcome differences.
• Identified key metabolic and signaling pathways relevant to COPD.
• Findings support the potential for developing molecular targets for therapeutic interventions and early diagnostic markers in COPD cohorts.