Primary lung fibroblasts from patients with idiopathic pulmonary fibrosis mount a disordered antiviral response to influenza A when senescent, producing higher viral titers and an altered inflammatory profile compared with healthy fibroblasts. Depletion of IRF3 or STAT1 sharply reduced interferon-beta secretion in senescent healthy cells but had only mild effects in IPF cells, indicating these fibroblasts no longer depend on canonical interferon signaling for viral control. The combination of senescence and fibrotic cell identity produces a local immune deficit that may underlie virus-triggered acute exacerbations.
Key Points
- Senescence raised influenza titers in both healthy and IPF lung fibroblasts
- IPF fibroblasts bypass IRF3 and STAT1 for interferon-beta production
- Fibrotic identity plus senescence yields a distinct, dysfunctional antiviral state
Longevity Analysis
Senescent cells are not merely inert passengers in aging tissue; within the lung they reshape how resident structural cells detect and respond to pathogens, converting a defensive signal into a miscalibrated one. The finding that IPF fibroblasts uncouple from canonical interferon regulators argues that senolytic or senomorphic strategies in fibrotic lung disease must be evaluated for their effect on local antiviral competence, not only on fibrotic burden. It also reframes respiratory infection risk in older adults as a question of tissue-level signal fidelity in the cells that build and repair the airway, rather than circulating immunity alone.
Original published by Wiley Aging Cell, by Jun‐Wei B. Hughes, Yasmina Reisser, Franziska Hornung, Tyler A. U. Hilsabeck, Fiona Senchyna, Ana L. Coelho, Tsung‐Che Ho, Kevin Schneider, David Furman, Cory M. Hogaboam, Claude Jourdan Le Saux, Pierre‐Yves Desprez, Stefanie Deinhardt‐Emmer .