Stimuli-specific senescence of primary human lung fibroblasts modulates alveolar stem cell function
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View abstract on PubMed
Summary
This summary is machine-generated.Cellular senescence in lung fibroblasts doesn't differ between idiopathic pulmonary fibrosis (IPF) and chronic obstructive pulmonary disease (COPD) patients. Senescence is induced by specific stimuli, impacting lung cell regeneration.
Area Of Science
- Pulmonary Medicine
- Cellular Biology
- Aging Research
Background
- Aging is a primary risk factor for chronic lung diseases (CLDs), including idiopathic pulmonary fibrosis (IPF) and chronic obstructive pulmonary disease (COPD).
- Cellular senescence, a hallmark of aging, is observed in lung fibroblasts of patients with CLDs.
- The potential differences in fibroblast senescence between IPF and COPD remain unexplored.
Approach
- Primary human lung fibroblasts (phLF) from control, IPF, and COPD donors were cultured.
- Cells were characterized for senescence at baseline and after exposure to H₂O₂, bleomycin, or TGF-β1.
- The impact of senescent phLF on distal alveolar epithelial progenitor cell function was assessed.
Key Points
- Primary human lung fibroblasts from IPF and COPD patients exhibit low baseline senescence.
- Hydrogen peroxide (H₂O₂) and bleomycin induced a senescent phenotype in phLF, while TGF-β1 promoted fibrosis.
- Fibroblast senescence susceptibility did not vary by disease origin; stimuli dictated senescence programs.
- Senescent phLF impaired alveolar epithelial progenitor cell colony formation in a stimulus-dependent manner.
Conclusions
- The senescent phenotype of lung fibroblasts is primarily determined by the inducing stimulus, not the disease origin (IPF vs. COPD).
- Induced fibroblast senescence negatively impacts the regenerative capacity of alveolar epithelial progenitor cells in vitro.
- These findings highlight the role of specific senescence-inducing factors in lung disease pathogenesis and progenitor cell dysfunction.
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