Abstract:
BACKGROUND:Although baker's asthma (BA) is a common occupational asthma, there have been few reports on this disease in Korean subjects. OBJECTIVES:We evaluated the prevalence of serum-specific IgE, IgG1, and IgG4 antibodies in relation to work-related respiratory symptoms in a single industrial bakery. METHODS:Three hundred and ninety-two bakery workers were administered and taken a questionnaire regarding respiratory symptoms. For symptomatic workers, the methacholine bronchial challenge test and specific bronchoprovocation tests with wheat extracts were carried out. Skin prick tests were performed and serum-specific IgE, IgG1, and IgG4 antibodies to wheat flour were detected. The IgE- and IgG4-binding components were identified by immunoblotting. RESULTS:Sixty-seven workers (17.1%) complained of work-related upper and lower respiratory symptoms. The prevalence of BA based on positive bronchoprovocation test results was 1.5%. The sensitization rate to wheat flour was 5.9% by skin prick test and 6.5% by ELISA, and was closely associated with the presence of atopy and work-related lower respiratory symptoms (P<0.001 for both). IgE immunoblotting revealed six major IgE-binding components (27, 31, 36, 43, 54, and 72 kDa). The presence of wheat-specific IgG1 and IgG4 antibodies was found to be significantly associated with exposure intensity (P<0.05 for both). CONCLUSIONS:The overall prevalence of wheat sensitization in a Korean bakery was 5.9%. We confirmed that an IgE-mediated response is the major pathogenic mechanism for the induction of work-related symptoms in wheat-exposed workers. Wheat-specific IgG antibodies may represent current or previous exposure to wheat dust.
journal_name
Respir Medjournal_title
Respiratory medicineauthors
Hur GY,Koh DH,Kim HA,Park HJ,Ye YM,Kim KS,Park HSdoi
10.1016/j.rmed.2007.11.015subject
Has Abstractpub_date
2008-04-01 00:00:00pages
548-55issue
4eissn
0954-6111issn
1532-3064pii
S0954-6111(07)00481-7journal_volume
102pub_type
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