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    Traffic-related air pollutants induce the release of allergen-containing cytoplasmic granules from grass pollen.

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    Authors
    Motta, A C
    Marliere, M
    Peltre, G
    Sterenberg, P A
    Lacroix, G
    Type
    Article
    Language
    en
    
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    Title
    Traffic-related air pollutants induce the release of allergen-containing cytoplasmic granules from grass pollen.
    Publiekssamenvatting
    BACKGROUND/AIM: Pollen cytoplasmic granules (PCG) are loaded with allergens. They are released from grass pollen grains following contact with water and can form a respirable allergenic aerosol. On the other hand, the traffic-related air pollutants NO2 and O3 are known to be involved in the current increase in the prevalence of allergic diseases via their adjuvant effects. Our objective was to determine the effects of air pollutants on the release of PCG from Phleum pratense (timothy grass) pollen. METHODS: P. pratense pollen was exposed to several concentrations of NO2 and O3. The induced morphological damages were observed by environmental scanning electron microscopy, and the amount of PCG released from the pollen upon contact with water was measured. RESULTS: The percentages of damaged grain were 6.4% in air-treated controls, 15% after treatment with the highest NO2 dose (50 ppm) and 13.5% after exposure to 0.5 ppm O3. In treated samples, a fraction of the grains spontaneously released their PCG. Upon subsequent contact with water, the remaining intact grains released more PCG than pollen exposed to air only. CONCLUSIONS: Traffic-related pollutants can trigger the release of allergen-containing granules from grass pollen, and increase the bioavailability of airborne pollen allergens. This is a new mechanism by which air pollution concurs with the current increase in the prevalence of allergic diseases.
    DOI
    10.1159/000091600
    PMID
    16491015
    URI
    http://hdl.handle.net/10029/7048
    ae974a485f413a2113503eed53cd6c53
    10.1159/000091600
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