title: HLA class II haplotypes associated with pulmonary interstitial lesions of polymyositis/dermatomyositis in Japanese patients.
abstract: To elucidate the immunogenetic background of idiopathic inflammatory myopathies (IIM) such as polymyositis (PM), dermatomyositis (DM) and any overlapping subsets, with other collagen vascular diseases, HLA class I antigens and class II alleles were determined and compared from individuals with various clinical and serological features of IIM, including pulmonary interstitial lesions (PI). Seventy-three Japanese patients with myositis (32 PM, 18 DM, 23 overlapped subsets) and 62 healthy unrelated controls were enrolled onto the study. Statistical differences between groups were determined by the Fisher's exact probability test. Serum fluorescent antinuclear antibody, rheumatoid factor (RF), anti-SS-A/Ro antibody, anti-Jo1 antibody and anti-U1 RNP antibody were examined using routine methods. PI was detected by chest X-ray and/or computed tomography. In patients with DM, the frequency of the HLA-DRB1*1302-DQA1*0102-DQB1*0604 haplotype was significantly higher than in the healthy controls (42.1% vs 17.7%), and in the patients with PM (42.1% vs 9.4%). Furthermore, the frequency of the HLA-DRB1*0405-DQA1*03-DQB1*0401 haplotype was higher in the PM patients with PI than in the controls (50.0% vs 17.7%), and PM without PI (50.0% vs 5.5%). These results suggest that in terms of HLA class II association, Japanese DM and PM, and PM with and without PI, belong to different clinical groups.
authors.affiliation: Department of Rheumatology and Hematology, Tokai University School of Medicine, Kanagawa, Japan. thoriki@ztv.ne.jp
authors.forename: T
authors.initials: T
authors.lastname: Horiki
authors.forename: Y
authors.initials: Y
authors.lastname: Ichikawa
authors.forename: J
authors.initials: J
authors.lastname: Moriuchi
authors.forename: Y
authors.initials: Y
authors.lastname: Hoshina
authors.forename: C
authors.initials: C
authors.lastname: Yamada
authors.forename: T
authors.initials: T
authors.lastname: Wakabayashi
authors.forename: K
authors.initials: K
authors.lastname: Jackson
authors.forename: H
authors.initials: H
authors.lastname: Inoko
mesh_terms: D000293:Adolescent; D000368:Aged; D000483:Alleles; D003882:Dermatomyositis / Q000235:genetics* / Q000473:pathology; D005260:Female; D005787:Gene Frequency; D005802:Genes, MHC Class II; D006683:HLA-DQ Antigens / Q000235:genetics; D059848:HLA-DQ alpha-Chains; D059866:HLA-DQ beta-Chains; D006684:HLA-DR Antigens / Q000235:genetics; D059811:HLA-DRB1 Chains; D006239:Haplotypes; D000949:Histocompatibility Antigens Class II / Q000235:genetics; D006801:Humans; D007564:Japan; D008168:Lung / Q000473:pathology; D017563:Lung Diseases, Interstitial / Q000235:genetics* / Q000473:pathology; D008297:Male; D017285:Polymyositis / Q000235:genetics* / Q000473:pathology
chemical_list: D006683:HLA-DQ Antigens; D059848:HLA-DQ alpha-Chains; D059866:HLA-DQ beta-Chains; C069050:HLA-DQA1 antigen; C069051:HLA-DQB1 antigen; D006684:HLA-DR Antigens; D059811:HLA-DRB1 Chains; D000949:Histocompatibility Antigens Class II