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House dust mite allergens, store-operated Ca2+ channels and asthma
1Laboratory of Signal Transduction, National Institute of Environmental Health Sciences, US National Institutes of Health, Department of Health and Human Services, Research Triangle Park, Durham, NC, USA.
Abstract:
The house dust mite is the principal source of aero-allergen worldwide. Exposure to mite-derived allergens is associated with the development of asthma in susceptible individuals, and the majority of asthmatics are allergic to the mite. Mite-derived allergens are functionally diverse and activate multiple cell types within the lung that result in chronic inflammation. Allergens activate store-operated Ca2+ release-activated Ca2+ (CRAC) channels, which are widely expressed in multiple cell types within the lung that are associated with the pathogenesis of asthma. Opening of CRAC channels stimulates Ca2+-dependent transcription factors, including nuclear factor of activated T cells and nuclear factor-κB, which drive expression of a plethora of pro-inflammatory cytokines and chemokines that help to sustain chronic inflammation. Here, I describe drivers of asthma, properties of mite-derived allergens, how the allergens are recognized by cells, the signalling pathways used by the receptors and how these are transduced into functional effects, with a focus on CRAC channels. In vivo experiments that demonstrate the effectiveness of targeting CRAC channels as a potential new therapy for treating mite-induced asthma are also discussed, in tandem with other possible approaches.
Insights
House dust mite allergens trigger asthma by activating calcium release-activated calcium (CRAC) channels in lung cells. Targeting these CRAC channels shows promise as a new therapy for mite-induced asthma.
Area of Science:
- Immunology
- Cell Biology
- Respiratory Medicine
Background:
- House dust mite allergens are a primary cause of allergic asthma worldwide.
- These allergens activate specific cellular pathways, leading to chronic lung inflammation.
- Store-operated calcium release-activated calcium (CRAC) channels are implicated in asthma pathogenesis.
Purpose of the Study:
- To explore the role of house dust mite allergens in asthma development.
- To elucidate the signaling pathways involved, focusing on CRAC channels.
- To discuss the therapeutic potential of targeting CRAC channels for asthma treatment.
Main Methods:
- Review of scientific literature on mite allergens, asthma, and CRAC channels.
- Analysis of cellular signaling pathways activated by allergens.
- Discussion of in vivo experimental findings on CRAC channel inhibition.
Main Results:
- Mite allergens activate CRAC channels in lung cells, promoting inflammation.
- CRAC channel activation leads to the expression of pro-inflammatory mediators.
- In vivo studies suggest CRAC channel targeting is a viable therapeutic strategy.
Conclusions:
- CRAC channels are key mediators in mite-induced asthma.
- Inhibiting CRAC channels represents a promising therapeutic avenue for allergic asthma.
- Further research into CRAC channel modulation could lead to novel asthma treatments.
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