Functional characterization of the atopy-associated gene PHF11 - 15/08/11
Reprint requests: Graham J. Jones, PhD, Institute for Immunology and Allergy Research, Westmead Millennium Institute, Westmead, 2145, NSW, Australia.Abstract |
Background |
Polymorphisms in the plant homeodomain finger protein 11 gene (PHF11) are associated with increased total serum IgE levels, asthma, and severe atopic dermatitis (AD) in children. Although PHF11 includes a plant homeodomain, a motif often found in transcriptional regulators, the function of PHF11 has not been investigated.
Objective |
We sought to test (1) whether PHF11 regulates the transcription of genes involved in allergic disorders and (2) whether polymorphisms in PHF11 predict changes in the expression or function of this gene.
Methods |
Microarray analysis was used to examine the expression of PHF11 in different immune cell subsets, and the function of PHF11 was tested by using small interfering RNA–induced knockdown or overexpression of PHF11 in primary CD4+ T cells or Jurkat T cells. Genotype-dependent effects on PHF11 expression were tested by using an allele-specific gene expression, and the transcriptional activity of PHF11 was determined by using luciferase hybrid gene reporter assays and in vitro DNA-binding electromobility shift assays.
Results |
PHF11 expression was higher in TH1 cells relative to that in TH2 cells, and knockdown of PHF11 expression reduced expression of the TH1-type cytokines IFN-γ and IL-2. The G-allele of a 3′ untranslated region polymorphism associated with AD was correlated with reduced abundance of PHF11 RNA in TH1 cells, as well as an increase in a PHF11 isoform lacking exon II. Evidence was also found for a physical and functional interaction between PHF11 and the p65 subunit of nuclear factor κB.
Conclusion |
PHF11 is a regulator of TH1-type cytokine gene expression. The reduction in PHF11 expression seen with an AD-associated genotype could contribute to the strong TH2 responses that characterize many allergic individuals.
Le texte complet de cet article est disponible en PDF.Key words : PHF11, atopic dermatitis, asthma, atopy, TH1, TH2, small interfering RNA, nuclear factor κB
Abbreviations used : AD, HEK, IL-2R, IL-12R, NF-κB, NFAT, PHD, PHF11, PMA, shRNA, siRNA, SNP, UTR
Plan
| Supported by a grant from the National Health and Medical Research Council of Australia. |
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| Disclosure of potential conflict of interest: M. S. Rolph has received research support from the National Health and Medical Research Council of Australia. G. J. Stewart has received research support from the National Health and Medical Research Council of Australia, the Australian Research Council, and Multiple Sclerosis Research Australia. G. J. Jones has received research support from the University of Sydney and the National Health and Medical Research Council of Australia. The rest of the authors have declared that they have no conflict of interest. |
Vol 121 - N° 5
P. 1148 - mai 2008 Retour au numéro
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