@article{oai:kanazawa-u.repo.nii.ac.jp:00026705,
 author = {Sugimori, Chiharu and Yamazaki, Hirohito and Feng, Xingmin and Mochizuki, Kanako and Kondo, Yukio and Takami, Akiyoshi and Chuhjo, Tatsuya and Kimura, Akinori and Teramura, Masanao and Mizoguchi, Hideaki and Omine, Mitsuhiro and Nakao, Shinji},
 issue = {1},
 journal = {Experimental Hematology},
 month = {Jan},
 note = {Objective: Although a number of reports have documented a significantly increased incidence of HLA-DR15 in aplastic anemia (AA), the exact role of HLA-DR15 in the immune mechanisms of AA remains unclear. We herein clarify the difference between DRB1*1501 and DRB1*1502, the two DRB1 alleles that determine the presentation of HLA-DR15, in the pathophysiology of AA. Materials and Methods: We investigated the relationships of the patients* HLA-DRB1 allele with both the presence of a small population of CD55-CD59- (PNH-type) blood cells and the response to antithymocyte globulin (ATG) plus cyclosporin (CsA) therapy in 140 Japanese AA patients. Results: Of the 30 different DRB1 alleles, only DRB1*1501 (33.6% vs 12.8%, pc < 0.01) and DRB1*1502 (43.6% vs 24.4%, pc < 0.01) displayed significantly higher frequencies among the AA patients than among a control. AA patients possessing HLA-DR15 tended to be old, and especially, the frequency of DRB1*1502 in patients 40 years of age and older (52.4%) was markedly higher than that in those younger than 40 years old (16.2%, pc < 0.01). Only DRB1*1501 was significantly associated with the presence of a small population of PNH-type cells and it also showed a good response to ATG plus CsA therapy in a univariate analysis. A multivariate analysis showed only the presence of a small population of PNH-type cells to be a significant factor associated with a good response to the immunosuppressive therapy (p < 0.01). Conclusions: Although both DRB1*1501 and DRB1*1502 contribute to the development of AA, the methods of contribution differ between the two alleles. © 2007 International Society for Experimental Hematology., 金沢大学医学部附属病院内科},
 pages = {13--20},
 title = {Roles of DRB1*1501 and DRB1*1502 in the pathogenesis of aplastic anemia},
 volume = {35},
 year = {2007}
}