Transcriptomic and Proteomic Changes Driving Pulmonary Fibrosis Resolution in Young and Old Mice.

Area of Science:

• Pulmonary Medicine
• Regenerative Medicine
• Aging Research

Background:

• Bleomycin-induced pulmonary fibrosis in mice models idiopathic pulmonary fibrosis but typically resolves.
• Aging is a significant factor influencing disease progression and recovery.
• Understanding fibrosis resolution mechanisms is crucial for developing therapeutic strategies.

Purpose of the Study:

• Investigate molecular mechanisms of lung repair and fibrosis resolution in aging mice.
• Identify transcriptional and proteomic signatures associated with lung repair.
• Determine the impact of aging on the temporal dynamics of fibrosis resolution.

Main Methods:

• Induction of pulmonary fibrosis using bleomycin in young and old mice.
• Analysis of lung function, structure, gene expression, and protein profiles over time.
• Focus on signaling pathways, including WNT, BMP, and TGFβ antagonists.

Main Results:

• Old mice exhibited delayed and incomplete lung function recovery post-bleomycin.
• Temporal shifts in gene and protein expression were observed in aged mice.
• Downregulation of WNT, BMP, and TGFβ antagonists (e.g., Frzb, Sfrp1, Dkk2) correlated with improved lung function.

Conclusions:

• Aging delays and impairs lung fibrosis resolution by altering gene and protein expression dynamics.
• Insufficient downregulation of specific antagonists hinders regenerative capacity in older mice.
• Identified signaling molecules represent potential therapeutic targets for enhancing lung regeneration in pulmonary fibrosis.