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  • Title: Interleukin-10 haplotype associated with total serum IgE in atopic dermatitis patients.
    Author: Shin HD, Park BL, Kim LH, Kim JS, Kim JW.
    Journal: Allergy; 2005 Sep; 60(9):1146-51. PubMed ID: 16076299.
    Abstract:
    BACKGROUND: The genetic background of atopic dermatitis (AD) is not clearly understood. Interleukin (IL)-10 is a powerful Th-2 cell cytokine produced by lymphoid cells that exerts its function by inhibiting macrophage/monocyte and T-cell lymphocyte replication and secretion of inflammatory cytokines [IL-1, tumour necrosis factor-alpha (TNFA), IL-6, IL-8 and IL-12]. OBJECTIVE: In an effort to discover additional polymorphism(s) in genes whose variant(s) have been implicated in total immunoglobulin E (IgE) level in AD patients, we scrutinized the single nucleotide polymorphisms (SNPs) in the IL10 gene as a potent candidate for contributing to the level of IgE in serum. METHODS: We recruited 334 AD patients and assayed their serum total IgE levels using the LIPA-200 system. Four SNPs in the IL10 gene were genotyped using the single-base extension (SBE) method. Logistic regression analyses were performed with single polymorphisms and haplotypes (ht) to determine their association with the level of serum total IgE. RESULTS: Genetic association analysis of total serum IgE in AD patients revealed that one of the IL10 ht, IL10-ht2, was associated with decreased serum total IgE in gene dose-dependent manner (P = 0.02-0.001). CONCLUSIONS: It was predicted that the inhibition of innate immunity by increased IL-10 production in IL10-ht2-bearing individuals might be associated with decreased total serum IgE levels among AD patients. The greater effects of IL10 ht on decreased total serum IgE levels suggest that the effect of IL-10 polymorphism might be the result of a combined genotype (ht) rather than single polymorphisms.
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