Rinsho Shinkeigaku (Clinical Neurology)

Original Article

Screening of autoantibodies associated with necrotizing myopathy among undiagnosed chronic myopathy

Satoshi Kuru, M.D., Ph.D.1), Shigeaki Suzuki, M.D., Ph.D.2), Katsuhisa Ogata, M.D., Ph.D.3), Michio Kobayashi, M.D., Ph.D.4), Chiho Ishida, M.D., Ph.D.5), Chigusa Watanabe, M.D., Ph.D.6) and Tsuyoshi Matsumura, M.D., Ph.D.7)

1)Department of Neurology, National Hospital Organization Suzuka Hospital
2)Department of Neurology, Keio University School of Medicine
3)Department of Neurology, National Hospital Organization Higashisaitama Hospital
4)Department of Neurology, National Hospital Organization Akita Hospital
5)Department of Neurology, National Hospital Organization Iou Hospital
6)Department of Neurology, National Hospital Organization Hiroshima-Nishi Medical Center
7)Department of Neurology, National Hospital Organization Toneyama Hospital

We screened anti-signal recognition particle (SRP) and anti-3-hydroxy-3-methylglutaryl-coenzyme A reductase (HMGCR) antibodies among 42 patients who had undiagnosed chronic myopathy from six national hospitals. Anti-SRP and anti-HMGCR antibodies were determined by RNA immuneprecipitation and enzyme-linked immune-sorbent assay (ELISA), respectively. We identified two patients with anti-SRP antibodies (4.7%) and, two with anti-HMGCR antibodies (4.7%). Both of anti-SRP-positive patients showed dysphagia with a high level of creatine kinase. Anti-HMGCR antibodies were associated with mild muscle weakness with a relatively late disease onset. Our study suggests the importance of autoantibody testing among undiagnosed chronic myopathy.
Full Text of this Article in Japanese PDF (378K)

(CLINICA NEUROL, 57: 562|566, 2017)
key words: anti-SRP antibody, anti-HMGCR antibody, chronic myopathy, immune-mediated necrotizing myopathy

(Received: 15-Jun-17)