Study Identifies Epigenetic Mechanism Linking Aging and Inflammation to Idiopathic Pulmonary Fibrosis
Researchers using human lung cell cultures found that aging AT2 cells progressively lose their normal function and transform into basal-like cells, a process accelerated by inflammation and linked to idiopathic pulmonary fibrosis (IPF). The study identified specific epigenetic changes and molecular pathways—involving IL-1β, NF-κB, and HIF-1—that drive this harmful cell transformation. These findings may explain how aging and inflammatory stress contribute to IPF development and could inform new therapeutic targets.
Using 3D organoid co-cultures with primary human fibroblasts, researchers demonstrated that healthy AT2 cells increasingly transform into KRT5+/KRT17+ basal cells with age, while their normal differentiation into AT1-like cells decreases. The team identified a shared gene signature in aging AT2 cells marked by epigenetic "priming" toward basal cell lineage, characterized by bivalent chromatin marks and increased accessibility in IPF patients. In vitro experiments showed that IL-1β treatment of young AT2 cells recapitulates this aging-associated priming through a NF-κB-regulated histone demethylase (JMJD3). The conversion to basal cell fate involves the transcription factor KLF5, which is recruited from AT1-specific to basal-specific promoters by HIF-1 under hypoxic conditions. The findings define an inflammation-driven epigenetic mechanism linking aging, inflammatory stress, hypoxia, and aberrant epithelial cell transformation in fibrotic lung disease.
Limitations & open questions
The study's limitations regarding translation to in vivo human disease, the generalizability of findings from organoid models to intact lung tissue, and the timeline for potential therapeutic development are not discussed in the abstract provided.
What different sources said
- bioRxivCenter
Epigenetic de-repression of basal cell metaplasia in aging AT2 cells is a risk factor for idiopathic pulmonary fibrosis (IPF).
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