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Interleukin-18 gene polymorphisms and rheumatoid arthritis: A meta-analysis

Authors
Ji, Jong DaeLee, Won Jin
Issue Date
1-7월-2013
Publisher
ELSEVIER SCIENCE BV
Keywords
IL-18; Polymorphism; Rheumatoid arthritis; Meta-analysis
Citation
GENE, v.523, no.1, pp.27 - 32
Indexed
SCIE
SCOPUS
Journal Title
GENE
Volume
523
Number
1
Start Page
27
End Page
32
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/102730
DOI
10.1016/j.gene.2013.03.132
ISSN
0378-1119
Abstract
Interleukin-18 (IL-18) is a member of the IL-1 superfamily that enhances both innate and acquired immune responses. IL-18 is highly expressed in sera, synovial fluids and synovial tissues of patients with RA, and these IL-18 levels are correlated with RA disease activity, indicating an important role of IL-18 in the pathogenesis of RA. Several studies have examined the association of IL-18 gene polymorphisms with RA, but these studies have shown inconclusive and controversial results. To verify the association between IL-18 gene polymorphism and susceptibility to RA, we conducted a meta-analysis of all relevant reports cited in MEDLINE/PubMed before October 2012. A meta-analysis on the association between the IL-18 rs1946518 SNP and RA was performed for 2944 patients with RA and 2377 controls from 7 published studies and a meta-analysis on the association between the IL-18 rs187238 SNP and RA was performed for 1319 patients with RA and 1211 controls from 5 published studies. In addition, 2 studies involving 1873 RA patients and 1092 controls were considered in the meta-analysis of the association between the IL-18 rs360722 SNP and RA. No significant association was found between two IL-18 SNPs (rs1946518 and rs187238) and RA susceptibility in all subjects. In subgroup analysis stratified by ethnicity, there was still no significant association between these two IL-18 SNPs and RA susceptibility. However, the frequency of the T allele at rs360722 was found to be significantly lower in patients with RA compared with controls, although this finding was based on only 2 studies. The results of our meta-analysis suggest that IL-18 rs360722 SNP is only associated with RA susceptibility. However, due to only two studies included in our meta-analysis, large-scale well designed studies should be considered in future studies to confirm the exact role of IL-18 rs360722 SNP in RA susceptibility. (C) 2013 Elsevier B.V. All rights reserved.
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