A multicenter comparison of MOG-IgG cell-based assays

Neurology. 2019 Mar 12;92(11):e1250-e1255. doi: 10.1212/WNL.0000000000007096. Epub 2019 Feb 6.

Abstract

Objectives: To compares 3 different myelin oligodendrocyte glycoprotein-immunoglobulin G (IgG) cell-based assays (CBAs) from 3 international centers.

Methods: Serum samples from 394 patients were as follows: acute disseminated encephalomyelitis (28), seronegative neuromyelitis optica (27), optic neuritis (21 single, 2 relapsing), and longitudinally extensive (10 single, 3 recurrent). The control samples were from patients with multiple sclerosis (244), hypergammaglobulinemia (42), and other (17). Seropositivity was determined by visual observation on a fluorescence microscope (Euroimmun fixed CBA, Oxford live cell CBA) or flow cytometry (Mayo live cell fluorescence-activated cell sorting assay).

Results: Of 25 samples positive by any methodology, 21 were concordant on all 3 assays, 2 were positive at Oxford and Euroimmun, and 2 were positive only at Oxford. Euroimmun, Mayo, and Oxford results were as follows: clinical specificity 98.1%, 99.6%, and 100%; positive predictive values (PPVs) 82.1%, 95.5%, and 100%; and negative predictive values 79.0%, 78.8%, and 79.8%. Of 5 false-positives, 1 was positive at both Euroimmun and Mayo and 4 were positive at Euroimmun alone.

Conclusions: Overall, a high degree of agreement was observed across 3 different MOG-IgG CBAs. Both live cell-based methodologies had superior PPVs to the fixed cell assays, indicating that positive results in these assays are more reliable indicators of MOG autoimmune spectrum disorders.

Publication types

  • Comparative Study
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Autoantibodies / analysis*
  • Autoantibodies / immunology
  • Case-Control Studies
  • Encephalomyelitis, Acute Disseminated / diagnosis*
  • Encephalomyelitis, Acute Disseminated / immunology
  • Flow Cytometry
  • HEK293 Cells
  • Humans
  • Hypergammaglobulinemia
  • Immunoglobulin G / analysis*
  • Immunoglobulin G / immunology
  • Microscopy, Fluorescence
  • Multiple Sclerosis
  • Myelin-Oligodendrocyte Glycoprotein / genetics
  • Myelin-Oligodendrocyte Glycoprotein / immunology*
  • Myelitis, Transverse
  • Neuromyelitis Optica / diagnosis*
  • Neuromyelitis Optica / immunology
  • Optic Neuritis / diagnosis*
  • Optic Neuritis / immunology
  • Serologic Tests / methods*
  • Transfection

Substances

  • Autoantibodies
  • Immunoglobulin G
  • Myelin-Oligodendrocyte Glycoprotein