Molecular differences between stable idiopathic pulmonary fibrosis and its acute exacerbation

Area of Science:

• Pulmonary Medicine
• Genomics
• Molecular Biology

Background:

• Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease with poorly understood acute exacerbation (AE) mechanisms.
• Gene expression profiling is crucial for elucidating molecular pathways in IPF AEs.

Purpose of the Study:

• To identify gene expression patterns associated with AEs of IPF.
• To uncover potential therapeutic targets and biomarkers for IPF AEs.

Main Methods:

• Utilized GEO datasets (GSE44723, GSE10667) and in-house RNA-seq data.
• Performed differential gene expression (DEG) analysis using the limma package.
• Constructed a protein-protein interaction (PPI) network with the STRING database and conducted gene ontology analysis.

Main Results:

• Identified 76 upregulated and 135 downregulated genes in AEs of IPF compared to stable IPF.
• The PPI network highlighted three core modules involving 24 differentially expressed genes (DEGs).
• Validated 11 upregulated genes (cell division) and 6 downregulated genes (skeletal muscle differentiation).

Conclusions:

• Cyclin A2 (CCNA2) was overexpressed in alveolar epithelium during IPF AEs.
• This study identified 16 novel genes associated with AEs of IPF.
• These findings suggest potential new therapeutic targets and biomarkers for managing IPF AEs.