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Updated: Dec 27, 2025
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Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
Published on: December 31, 2013
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Club Cell TRPV4 Serves as a Damage Sensor Driving Lung Allergic Inflammation
Darin L Wiesner1, Richard M Merkhofer1, Carole Ober2
1Department of Pediatrics, University of Wisconsin-Madison, Madison, WI 53706, USA.
Cell Host & Microbe
|March 5, 2020
Summary
Airway club cells detect mechanical stress from fungal allergens like Alp1 via TRPV4 channels, initiating allergic asthma responses. This discovery highlights a key mechanism in fungal sensitization and asthma development.
Area of Science:
- Immunology
- Cell Biology
- Respiratory Medicine
Background:
- Airway epithelium is the primary defense against inhaled irritants.
- Proteases in allergens, such as alkaline protease 1 (Alp1) from Aspergillus species, are critical in provoking asthma.
- Club cells in the bronchioles are crucial for initiating allergic responses.
Purpose of the Study:
- To elucidate the mechanism by which airway epithelial cells recognize and respond to the aeroallergen Alp1.
- To investigate the role of the mechanosensitive calcium channel TRPV4 in allergic sensitization to fungal allergens.
- To link fungal sensitization and asthma with specific genetic variations and protein expression of TRPV4 in human populations.
Main Methods:
- Utilized a murine model to study the effects of Alp1 on lung eosinophilia and club cell response.
- Investigated calcium flux and calcineurin signaling within club cells upon Alp1 exposure.
- Analyzed two human cohorts to correlate fungal sensitization and/or asthma with TRPV4 single nucleotide polymorphisms (SNPs) and protein expression.
Main Results:
- Alp1 rapidly activates bronchiolar club cells, causing damage to cell junctions.
- This junction damage triggers a calcium flux mediated by calcineurin in club cells, leading to inflammation.
- A strong association was found between fungal sensitization/asthma and TRPV4 SNP/protein levels in human cohorts.
- TRPV4 was identified as essential and sufficient for club cells to sensitize mice to Alp1.
Conclusions:
- Club cells detect junction damage as mechanical stress, initiating danger signals.
- The TRPV4-calcium-calcineurin pathway in club cells is critical for allergic sensitization to fungal allergens.
- This mechanism provides a novel understanding of how fungal allergens contribute to asthma pathogenesis.
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