Comparative transcriptomics in human COPD reveals dysregulated genes uniquely expressed in ferrets.

Area of Science:

• Pulmonary Medicine
• Genomics
• Animal Models

Background:

• Chronic obstructive pulmonary disease (COPD) is a progressive lung disease with limited treatment options.
• Current mouse models fail to fully replicate key features of human COPD, such as chronic bronchitis.
• There is a need for more clinically relevant animal models to study COPD pathogenesis and develop new therapies.

Purpose of the Study:

• To investigate the utility of a ferret model for studying chronic obstructive pulmonary disease (COPD).
• To compare gene expression profiles in a cigarette smoke-induced ferret COPD model with human and mouse COPD data.
• To identify unique molecular pathways and genes relevant to human COPD pathogenesis in the ferret model.

Main Methods:

• Wild-type ferrets were exposed to cigarette smoke or air for six months.
• RNA sequencing was performed on lung tissue to identify differentially expressed genes (DEGs).
• Comparative transcriptomics analysis was conducted between ferrets, mice, and humans, with validation by real-time PCR.

Main Results:

• Cigarette smoke exposure in ferrets resulted in 420 differentially expressed genes (DEGs) associated with COPD.
• Twenty-five DEGs were uniquely expressed in both ferrets and humans, but not mice.
• These unique DEGs are involved in pathways related to mucociliary clearance, lung function, inflammation, and oxidative stress, mirroring human COPD.
• Real-time PCR confirmed significant mRNA changes in selected genes.

Conclusions:

• The ferret model exhibits gene expression patterns consistent with human COPD following cigarette smoke exposure.
• The ferret model recapitulates key molecular aspects of human COPD pathogenesis, including chronic bronchitis-related pathways.
• This model offers a valuable and potentially superior alternative to mouse models for investigating COPD and testing therapeutic interventions.