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Related Concept Videos

Asthma: Pathogenesis and Management01:20

Asthma: Pathogenesis and Management

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Asthma is a chronic pulmonary condition involving inflammation of the airways, hyper-reactivity, and reversible obstruction of the airways. This condition can significantly impact a person's quality of life, making breathing difficult and leading to distressing symptoms.
Asthma is classified as allergic and non-allergic. Allergens such as dust mites, pollen, and pet dander trigger allergic asthma, while factors like cold air, intense emotions, or exercise can induce non-allergic asthma.
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Asthma-II: Pathophysiology and Classification01:26

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Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
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Antiasthma Drugs: Mast Cell Stabilizers and Anti-IgE Drugs01:25

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Asthma is a chronic respiratory condition for which new therapeutic avenues, including anti-inflammatory drugs like mast cell stabilizers and anti-IgE treatments, continue to be developed.
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Related Experiment Video

Updated: Sep 11, 2025

Advanced Imaging of Lung Homing Human Lymphocytes in an Experimental In Vivo Model of Allergic Inflammation Based on Light-sheet Microscopy
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27-Hydroxycholesterol Exacerbates the Pathogenesis of Asthma.

Ya Li1, Xingyue Liu1, Feifei Shang1

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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.

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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.