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July 10, 2017

Author update: Sarcoplasmic MxA expression: A valuable marker of dermatomyositis


Soon after our article published,1 we learned the sale of the myxovirus resistance A (MxA) polyclonal antibodies used in the study (Mx1/2/3 [H-285], sc-50509, Santa Cruz Biotechnology, Dallas, TX) had been discontinued. Furthermore, we received inquiries from several physicians concerning alternate MxA antibodies. We tested the company's monoclonal antibody alternate (Mx1/2/3 [C-1], sc-166412) on frozen muscle sections at various dilutions in 2% bovine serum albumin in PBS using the Ventana immunohistochemistry detection system (Ventana Medical Systems, Tucson, AZ) with or without the enhancement mode. Muscle samples tested included MxA-positive dermatomyositis (n = 3, including 1 juvenile participant), MxA-negative dermatomyositis (n = 3), anti-Jo-1 myopathy (n = 3, MxA-negative), and immune-mediated necrotizing myopathy (n = 3, comprising 1 with anti-signal recognition particle antibodies [MxA-negative], 1 with anti-3-hydroxy-3-methylglutaryl-CoA reductase antibodies [MxA-negative], and 1 without those antibodies [MxA-positive]). We observed essentially the same staining pattern at comparable signal intensity as the original polyclonal antibodies at 1:10 dilution with the enhancement mode although the signal was barely detected at the manufacturer's recommended dilution (starting dilution: 1:50), indicating that the monoclonal antibody alternate can be similarly used to detect sarcoplasmic MxA expression on frozen muscle sections for the diagnosis of dermatomyositis (although higher concentration is necessary).

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Uruha A, Nishikawa A, Tsuburaya RS, et al. Sarcoplasmic MxA expression: a valuable marker of dermatomyositis. Neurology 2017;88:493–500.

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Published In

Volume 89Number 2July 11, 2017
Pages: 215
PubMed: 28696934

Publication History

Published online: July 10, 2017
Published in print: July 11, 2017


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Cited By
  1. Updates on the Immunopathology in Idiopathic Inflammatory Myopathies, Current Rheumatology Reports, 23, 7, (2021).
  2. Distinct Histopathologic Patterns of Finger Eruptions in Dermatomyositis Based on Myositis-Specific Autoantibody Profiles, JAMA Dermatology, 155, 9, (1080), (2019).
  3. Diagnostic potential of sarcoplasmic myxovirus resistance protein A expression in subsets of dermatomyositis, Neuropathology and Applied Neurobiology, 45, 5, (513-522), (2018).

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