Dust mites plus silica can trigger a pathway to steroid-resistant lung inflammation
Inflammation associated with asthma and other allergic airway diseases can be significantly worsened by exposure to both house dust mite allergens and crystalline silica, according to a new study published in the journal Allergy.
A new study reveals that dust mite allergens combined with silica can lead to severe lung inflammation that resists treatment with corticosteroids. The research, conducted on mice and human airway cells, found that exposure to both substances together caused greater airway narrowing, thickening and mucus production than exposure to house dust mite allergens alone.
Lead author Rabih Halwani, of the University of Sharjah, says the results provide the first evidence that this combination triggers steroid hyporesponsiveness in the lungs. In the animals, exposure to crystalline silica and house dust mite allergens produced an imbalance in the glucocorticoid receptor, reducing the effectiveness of corticosteroid treatment. This imbalance was linked to excessive activation of the STING pathway, a key cellular defense mechanism.
The study cautions that while the findings in mice are promising, the research is still preliminary and must undergo further clinical testing before any potential treatments can be considered in humans. Halwani stresses that additional studies, such as genetic deletion of STING, are needed to confirm the research findings.
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