IL-4 alpha chain receptor (IL-4Rα) polymorphisms in allergic bronchopulmonary sspergillosis

BACKGROUND: Allergic bronchopulmonary aspergillosis occurs in 7–10% of cystic fibrosis (CF) and 1–2% of asthmatic patients. HLA-DR restriction and increased sensitivity to IL-4 stimulation have been proposed as risk factors in these populations. OBJECTIVE: We examined for the presence of IL-4 recept...

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Detalles Bibliográficos
Autores principales: Knutsen, Alan P, Kariuki, Barbara, Consolino, Judy D, Warrier, Manoj R
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2006
Materias:
Research
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1403796/
https://www.ncbi.nlm.nih.gov/pubmed/16503977
http://dx.doi.org/10.1186/1476-7961-4-3
Descripción
Sumario:BACKGROUND: Allergic bronchopulmonary aspergillosis occurs in 7–10% of cystic fibrosis (CF) and 1–2% of asthmatic patients. HLA-DR restriction and increased sensitivity to IL-4 stimulation have been proposed as risk factors in these populations. OBJECTIVE: We examined for the presence of IL-4 receptor alpha chain (IL-4Rα) single nucleotide polymorphisms (SNPs) in ABPA and whether these accounted for increased sensitivity to IL-4 stimulation. METHODS: One extracellular (ile75val) and four cytoplasmic IL-4Rα SNPs were analyzed in 40 CF and 22 asthmatic patients and in 56 non-ABPA CF and asthmatic patients. Sensitivity to IL-4 stimulation was measured by induction of CD23 expression on B cells. RESULTS: IL-4Rα SNPs were observed in 95% of ABPA patients. The predominant IL-4Rα SNP was the extracellular IL-4Rα SNP, ile75val, observed in 80% of ABPA patients. CONCLUSION: The presence of IL-4Rα SNPs, principally ile75val, appears to be a genetic risk for the development of ABPA.

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