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27-Hydroxycholesterol Exacerbates the Pathogenesis of Asthma.
Ya Li1, Xingyue Liu1, Feifei Shang1
1Anhui Province Key Laboratory of Immunology in Chronic Diseases, Bengbu Medical University, Bengbu, China.
Immunology
|August 11, 2025
Summary
27-Hydroxycholesterol (27-HC), produced by alveolar macrophages, exacerbates asthma by increasing inflammation and impairing efferocytosis. This cholesterol metabolite highlights macrophage-epithelial cell cross-talk in asthma pathogenesis.
Area of Science:
- Biochemistry
- Immunology
- Pulmonology
Background:
- 27-Hydroxycholesterol (27-HC) is an oxysterol metabolite of cholesterol.
- 27-HC influences inflammatory responses and extracellular matrix production, suggesting a role in asthma.
Purpose of the Study:
- To investigate the role of 27-HC in asthma pathogenesis.
- To identify the source and regulatory mechanisms of 27-HC in asthma.
- To explore the impact of 27-HC on immune cell function and airway inflammation.
Main Methods:
- Analysis of CYP27A1 expression and 27-HC levels in asthmatic mouse lungs.
- Assessment of 27-HC effects on bronchoalveolar lavage fluid cell counts and lung tissue inflammation.
- Investigation of IL-33-induced 27-HC production by alveolar macrophages (AMs) via NF-κB signaling.
- Evaluation of 27-HC's impact on airway epithelial cell (AEC) efferocytosis through AMPK activation.
Main Results:
- Elevated CYP27A1 expression and 27-HC production were observed in asthmatic mouse lungs, with AMs as the primary source.
- 27-HC aggravated asthma symptoms, including increased inflammatory cells, eosinophils, and airway hyper-responsiveness.
- IL-33 stimulated 27-HC production by AMs through the NF-κB pathway.
- 27-HC inhibited AEC efferocytosis via AMPK activation.
Conclusions:
- 27-HC, primarily from AMs, plays a significant role in asthma pathogenesis by promoting inflammation and impairing efferocytosis.
- Cross-talk between macrophages and epithelial cells, mediated by 27-HC, is crucial in regulating asthma.
- These findings offer insights into asthma mechanisms and potential therapeutic targets.
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