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Mold-sensitivity in children with moderate-severe asthma is associated with HLA-DR and HLA-DQ.

Authors: Knutsen, AP  Vijay, HM  Kumar, V  Kariuki, B  Santiago, LA  Graff, R  Wofford, JD  Shah, MR 
Citation: Knutsen AP, etal., Allergy. 2010 Nov;65(11):1367-75. doi: 10.1111/j.1398-9995.2010.02382.x. Epub 2010 Jun 16.
Pubmed: (View Article at PubMed) PMID:20486920

BACKGROUND: Several epidemiologic studies in the United States and Europe have linked Alternaria sensitivity to both persistence and severity of asthma. In this study, we examined T cell responses and HLA class II alleles in children with moderate-severe asthma. METHODS: Ninety-six children with moderate-severe asthma were compared to 90 children with mild asthma. HLA class II genotyping was performed to determine HLA allelic frequencies. Th1/Th2 Alternaria-specific T cell cytokine responses were determined by the use of Alternaria-stimulated cultures. HLA class II restriction was examined by inhibition of Alternaria-stimulated lymphoproliferative responses with blocking anti-HLA class II monoclonal antibodies. RESULTS: Children with moderate-severe asthma had significantly increased sensitivities to Aspergillus fumigatus; sensitivities to Alternaria were similar in both moderate-severe and mild asthmatics. The frequency of HLA-DRB1*13 alleles were increased in mold-sensitive moderate-severe asthmatic children. HLA-DRB1*03 tended to be increased in mold-sensitive moderate-severe asthmatics. The frequency of HLA-DQB1*03 alleles was significantly decreased in mold and Alternaria-sensitive moderate-severe asthma. HLA class II blocking monoclonal antibodies demonstrated HLA-DR restriction. Alternaria-stimulated IL-5 and IL-13 synthesis was significantly increased in moderate-severe asthmatics. IL-5 and IL-13 synthesis was significantly increased in Alternaria-stimulated lymphocyte cultures of HLA-DQB1*03- asthmatics compared to HLA-DQB1*03+ asthmatics. CONCLUSIONS: In children with Alternaria-sensitive moderate-severe asthma, there was increased Th2 sensitivity to Alternaria stimulation. This was associated with HLA-DR restriction and with increased frequency of HLA-DRB1*13 and HLA-DRB1*03. There was decreased frequency of HLA-DQB1*03 in Alternaria-sensitive moderate-severe asthma, suggesting HLA-DQB1*03 may be protective of the development of Alternaria-sensitive severe asthma.

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CRRD Object Information
CRRD ID: 5147607
Created: 2011-08-15
Species: All species
Last Modified: 2011-08-15
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.