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Furuya, T. et al.

Furuya, Hakoda, Tsuchiya, Kotake, Ichikawa, Nanke, Nakajima, Takeuchi, Nishinarita, Kondo, Kawasaki, Kobayashi, Mimori, Tokunaga, Kamatani,

Immunogenetic features in 120 Japanese patients with idiopathic inflammatory myopathy.

OBJECTIVE: To examine the role of HLA-DRB1 and tumor necrosis factor (TNF) promoter genotypes in the development and the autoantibody profiles of idiopathic inflammatory myopathy (IIM) in Japanese patients. METHODS: HLA-DRB1 and TNF promoter genotypes were determined, and serum antinuclear autoantibodies were identified in 120 adult Japanese patients with IIM [72 with dermatomyositis (DM), 30 with polymyositis (PM), 18 with myositis overlapping with other collagen vascular diseases], as well as in 265 controls. RESULTS: Forty-two patients (35%) were positive for myositis-specific autoantibodies (MSA), including 37 (31%) for anti-aminoacyl-tRNA synthetase ( ARS) autoantibodies. Allele carrier frequency of HLA-DRB1*0803 was increased in the patients with IIM [p = 0.02, corrected p (pc) NS, 23% vs 14%, odds ratio (OR) = 1.9 (95% confidence interval, CI = 1.1-3.2)], with PM [p = 0.006, pc NS, 33%, OR 3.1 (95% CI 1.3-7.1)], and with anti-ARS autoantibodies [27%, p = 0.04, OR 2.3 (95% CI 1.0-5.1)] compared with controls. DRB1*0405 was increased in patients with anti-ARS autoantibodies compared with controls [41% vs 25%, p = 0.04, pc NS, OR 2.1 (95% CI 1.0-4.3)]. TNF promoter genotype was associated with the presence of interstitial lung disease (ILD). The carriage of a TNF-a haplotype formed by -1031C, -863A, and -857C was increased in the patients with ILD versus those without ILD [33% vs 18%, p = 0.05, pc NS, OR 2.3 (95% CI 0.94-5.5)]. CONCLUSION: HLA-DRB1 alleles were associated with development of IIM and MSA in a Japanese population.[1]

References

Immunogenetic features in 120 Japanese patients with idiopathic inflammatory myopathy. Furuya, T., Hakoda, M., Tsuchiya, N., Kotake, S., Ichikawa, N., Nanke, Y., Nakajima, A., Takeuchi, M., Nishinarita, M., Kondo, H., Kawasaki, A., Kobayashi, S., Mimori, T., Tokunaga, K., Kamatani, N. J. Rheumatol. (2004) [Pubmed]

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