Does Chronic Obstructive Pulmonary Disease Originate from Different Cell Types?

Area of Science:

• Pulmonary Medicine
• Cell Biology
• Immunology

Background:

• Chronic obstructive pulmonary disease (COPD) exhibits heterogeneous clinical presentations, complicating diagnosis and treatment.
• Current COPD subtyping relies on late-stage disease samples, limiting understanding of early pathogenesis.
• Distinct COPD phenotypes may originate from differential cell type susceptibility to environmental insults in early disease stages.

Purpose of the Study:

• To review current knowledge on lung cell types initiating COPD pathogenesis.
• To identify knowledge gaps regarding cell-type-specific roles in COPD phenotypes and genetic associations.
• To highlight the potential of new technologies for elucidating COPD pathophysiology and heterogeneity.

Main Methods:

• Literature review and synthesis of existing studies on COPD pathogenesis.
• Focus on the susceptibility of key lung cell populations including macrophages, lymphocytes, and epithelial cells.
• Discussion of emerging technologies like single-cell transcriptomics and proteomics.

Main Results:

• Macrophages, T and B cells, mast cells, dendritic cells, endothelial cells, and airway epithelial cells are implicated in early COPD initiation.
• Significant knowledge gaps exist regarding which specific cell types drive distinct COPD phenotypes and disease stages.
• The role of various cell types in mediating genetic risk factors for COPD remains largely unclear.

Conclusions:

• Understanding the susceptibility of specific lung cell types to environmental factors is crucial for deciphering COPD heterogeneity.
• Advanced single-cell and proteomic technologies offer promising avenues to resolve COPD pathophysiology and clinical variability.
• Further research is needed to link specific cell types to distinct COPD phenotypes and genetic predispositions.