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May 20, 2026American Journal of Respiratory and Critical Care Medicine

A74-18 Alveolar Epithelial Cell Senescence Promotes Fibrosis by Limiting Repair After Injury

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Authors

VPV PeddibhotlaDSD I SullivanKSK Salvadore

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Overview

Randomized trial shows that alveolar epithelial cell senescence impairs lung repair in pulmonary fibrosis, indicating a targeted therapeutic approach.

Key Points

  • This study investigates how telomere dysfunction-induced senescence in alveolar epithelial cells impairs lung repair mechanisms in idiopathic pulmonary fibrosis.
  • Developed a mouse model with deletion of Terf2 in AEC2s to induce senescence.
  • Challenged mice with PR8 influenza to assess lung injury and repair.
  • Performed histological, immunological, and single-cell RNA sequencing analyses to characterize lung response.
  • Mice with senescent AEC2s exhibited greater weight loss and increased lung injury compared to controls.
  • Histological analysis showed significantly more lung consolidation and injury in senescent AEC2s post-influenza infection.
  • Targeted depletion of AEC2s led to robust inflammatory and fibrotic responses, suggesting impaired epithelial repair contributes to fibrosis.

Cite This Study

Peddibhotla et al. (2026) studied this question.

synapsesocial.com/papers/6a0d4f92f03e14405aa9afa3https://doi.org/10.1093/ajrccm/aamag162.5349
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Senescence in Alveolar Epithelial Type II Cells Promotes Acute Lung Injury and Impairs Regeneration2024 · 9 citations
  2. 2D95-08 Emergence of Distinct Pathologic Basal Cell Sub-types in Lung Fibrosis Mediated by Senescence2026
  3. 3Research on Alveolar Type II Epithelial Cell Senescence in Idiopathic Pulmonary Fibrosis2026
  4. 4A74-20 Stiffness-Dependent Alveolar Type II Cell Senescence in Idiopathic Pulmonary Fibrosis2026
  5. 5Lipid Deficiency Contributes to Impaired Alveolar Progenitor Cell Function in Aging and Idiopathic Pulmonary Fibrosis2024 · 24 citations