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ヌノムラ タカコ
布村 多佳子 所属 医学部 医学科（東京女子医科大学病院） 職種 准教授 |
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| 論文種別 | 原著 |
| 言語種別 | 英語 |
| 査読の有無 | 査読あり |
| 表題 | Reliability of antinuclear matrix protein 2 antibody assays in idiopathic inflammatory myopathies is dependent on target protein properties. |
| 掲載誌名 | 正式名：The Journal of dermatology 略 称：J Dermatol ISSNコード：13468138/03852407 |
| 掲載区分 | 国外 |
| 巻・号・頁 | 49(4),pp.441-447 |
| 著者・共著者 | Ichimura Yuki, Konishi Risa, Shobo Miwako, Inoue Sae, Okune Mari, Maeda Akemi, Tanaka Ryota, Kubota Noriko, Matsumoto Isao, Ishii Akiko, Tamaoka Akira, Shimbo Asami, Mori Masaaki, Morio Tomohiro, Kishi Takayuki, Miyamae Takako, Tanboon Jantima, Inoue Michio, Nishino Ichizo, Fujimoto Manabu, Nomura Toshifumi, Okiyama Naoko |
| 発行年月 | 2022/04 |
| 概要 | A line blotting assay (LB) is currently used to detect myositis-specific autoantibodies (MSAs) in patients with idiopathic inflammatory myopathies (IIMs), because of its simplicity; however, the sensitivity and specificity of this assay is low. The aim of this study is to evaluate the accuracy of the commercial LB in detection of antinuclear matrix protein 2 (NXP2) antibody. Seventy-seven serum samples from patients with IIMs, in which anti-NXP2 antibodies were detected through immunoprecipitation and western blotting (IP-WB) using K562 cell lysate, were enrolled. All samples were assessed by LB and IP-WB using recombinant human NXP2 whole protein (rNXP2) produced by insect cells, and the positive rates of each assay were compared. Thirty-two samples (41.6%) showed false-negativity by LB, which includes 11 samples with negative results by IP-WB using rNXP2. Relative intensities of IP-WB using cell lysate were significantly higher in the samples with positive results by both LB and IP-WB using rNXP2, compared to samples with positive by IP-WB using rNXP2 but negative by LB. Three of 11 samples with negative results by both LB and IP-WB using rNXP2 revealed high antibody titers. Further, differences in post-transcriptional SUMOylation were observed between recombinant and natural NXP2 proteins. In conclusion, the LB showed low sensitivity for detection of anti-NXP2 antibody, an effect exacerbated at low titers of anti-NXP2 antibodies. Moreover, there appears to be differences in the reactivities of antibodies to recombinant and natural NXP2 proteins with different post-transcriptional modifications. |
| DOI | 10.1111/1346-8138.16295 |
| PMID | 34967032 |