Work-related allergy and asthma in spice mill workers – the impact of processing dried spices on IgE reactivity patterns

van der Walt, Anita, Lopata, Andreas L., Nieuwenhuizen, Natalie E., and Jeebhay, Mohamed F. (2010) Work-related allergy and asthma in spice mill workers – the impact of processing dried spices on IgE reactivity patterns. International Archives of Allergy and Clinical Immunology, 152 (3). pp. 271-278.

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Background: Three spice mill workers developed work-related allergy and asthma after prolonged exposure to high levels (>10 mg/m3) of inhalable spice dust. Patterns of sensitization to a variety of spices and putative allergens were identified. Methods: Work-related allergy and asthma were assessed on history, clinical evaluation, pulmonary function and fractional exhaled nitric oxide. Specific IgE reactivity to a range of common inhalant, food and spice allergens was evaluated using ImmunoCAP and allergen microarray. The presence of non-IgE-mediated reactions was determined by basophil stimulation (CAST-ELISA). Specific allergens were identified by immunoblotting to extracts of raw and dried processed garlic, onion and chili pepper. Results: Asthma was confirmed in all 3 subjects, with work-related patterns prominent in worker 1 and 3. Sensitization to multiple spices and pollen was observed in both atopic workers 1 and 2, whereas garlic and chili pepper sensitization featured in all 3 workers. Microarray analysis demonstrated prominent profilin reactivity in atopic worker 2. Immunoblotting demonstrated a 50-kDa cross-reactive allergen in garlic and onion, and allergens of approximately 40 and 52 kDa in chili pepper. Dry powdered garlic and onion demonstrated greater IgE binding. Conclusions: This study demonstrated IgE reactivity to multiple spice allergens in workers exposed to high levels of inhalable spice dust. Processed garlic and onion powder demonstrated stronger IgE reactivity than the raw plant. Atopy and polysensitization to various plant profilins, suggesting pollen-food syndrome, represent additional risk factors for sensitizer-induced work-related asthma in spice mill workers.

Item ID: 15065
Item Type: Article (Research - C1)
ISSN: 1423-0097
Keywords: work-related allergy, allergy, asthma, garlic, processed allergens, spices
Date Deposited: 30 Nov 2010 02:18
FoR Codes: 06 BIOLOGICAL SCIENCES > 0601 Biochemistry and Cell Biology > 060199 Biochemistry and Cell Biology not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920108 Immune System and Allergy @ 100%
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