27-Hydroxycholesterol accelerates cellular senescence in human lung resident cells
Yuichiro Hashimoto1, Hisatoshi Sugiura2, Shinsaku Togo3
1Department of Respiratory Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan;
Summary
27-hydroxycholesterol (27-OHC) accelerates cellular senescence in lung cells, contributing to chronic obstructive pulmonary disease (COPD). This cholesterol metabolite impairs tissue repair and is elevated in COPD patients, suggesting a key role in disease development.
Area of Science:
- Pulmonary Medicine
- Cell Biology
- Cholesterol Metabolism
Background:
- Cellular senescence is implicated in chronic obstructive pulmonary disease (COPD) pathogenesis.
- 27-hydroxycholesterol (27-OHC) levels are elevated in COPD airways compared to healthy individuals.
Purpose of the Study:
- To investigate senescence in COPD lung fibroblasts.
- To determine the effects of 27-OHC on lung resident cell senescence (fibroblasts, airway epithelial cells).
Main Methods:
- Immunohistochemical staining for senescence markers and sterol 27-hydroxylase in COPD lungs.
- Exposure of lung resident cells to 27-OHC to assess senescence induction.
- Evaluation of senescence markers, cell growth, and fibroblast tissue repair function.
Main Results:
- COPD lung fibroblasts exhibit enhanced senescence-associated protein expression and accelerated senescence.
- Sterol 27-hydroxylase is upregulated in COPD lung fibroblasts and alveolar macrophages.
- 27-OHC treatment increased senescence markers, delayed cell growth via prostaglandin E2-reactive nitrogen species pathway, and impaired fibroblast tissue repair.
- COPD fibroblasts are more susceptible to 27-OHC-induced senescence.
Conclusions:
- 27-hydroxycholesterol accelerates cellular senescence in lung resident cells.
- 27-OHC may play a pivotal role in the cellular senescence observed in COPD pathogenesis.
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