title: Antibodies to myelin oligodendrocyte glycoprotein in bilateral and recurrent optic neuritis.
abstract: OBJECTIVE
  We examined a cohort of adults with aquaporin-4 (AQP4) antibody-negative neuromyelitis optica/neuromyelitis optica spectrum disorder (NMO/NMOSD) for antibodies to myelin oligodendrocyte glycoprotein (MOG).
  
  
  METHODS
  We performed a flow cytometry cell-based assay using live human lentivirus-transduced cells expressing full-length surface MOG. Serum was tested in 23 AQP4 antibody-negative NMO/NMOSD patients with bilateral and/or recurrent optic neuritis (BON, n = 11), longitudinally extensive transverse myelitis (LETM, n = 10), and sequential BON and LETM (n = 2), as well as in patients with multiple sclerosis (MS, n = 76) and controls (n = 52).
  
  
  RESULTS
  MOG antibodies were detected in 9/23 AQP4 antibody-negative patients with NMO/NMOSD, compared to 1/76 patients with MS and 0/52 controls (p < 0.001). MOG antibodies were detected in 8/11 patients with BON, 0/10 patients with LETM, and 1/2 patients with sequential BON and LETM. Six of 9 MOG antibody-positive patients had a relapsing course. MOG antibody-positive patients had prominent optic disc swelling and were more likely to have a rapid response to steroid therapy and relapse on steroid cessation than MOG antibody-negative patients (p = 0.034 and p = 0.029, respectively). While 8/9 MOG antibody-positive patients had good follow-up visual acuity, one experienced sustained visual impairment, 3 had retinal nerve fiber layer thinning, and one had residual spinal disability.
  
  
  CONCLUSIONS
  MOG antibodies have a strong association with BON and may be a useful clinical biomarker. MOG antibody-associated BON is a relapsing disorder that is frequently steroid responsive and often steroid dependent. Failure to recognize the disorder early and institute immunotherapy promptly may be associated with sustained impairment.
  
  
  METHODS
  This study provides Class II evidence that MOG antibodies are associated with AQP4 antibody-negative BON (sensitivity 69%, 95% confidence interval [CI] 42%-87%; specificity 99%, 95% CI 93.7%-99.8%).
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authors.forename: Sudarshini
authors.initials: S
authors.lastname: Ramanathan
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authors.forename: Stephen W
authors.initials: SW
authors.lastname: Reddel
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authors.forename: Andrew
authors.initials: A
authors.lastname: Henderson
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authors.forename: John D E
authors.initials: JD
authors.lastname: Parratt
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authors.forename: Michael
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authors.lastname: Barnett
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authors.forename: Prudence N
authors.initials: PN
authors.lastname: Gatt
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authors.forename: Vera
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authors.lastname: Merheb
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authors.forename: Raani-Yogeeta Anusuiya
authors.initials: RY
authors.lastname: Kumaran
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authors.forename: Karrnan
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authors.lastname: Pathmanandavel
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authors.forename: Nese
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authors.lastname: Sinmaz
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authors.forename: Mahtab
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authors.lastname: Ghadiri
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authors.forename: Con
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authors.lastname: Yiannikas
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authors.forename: Steve
authors.initials: S
authors.lastname: Vucic
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authors.forename: Graeme
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authors.lastname: Stewart
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authors.forename: Andrew F
authors.initials: AF
authors.lastname: Bleasel
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authors.forename: David
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authors.lastname: Booth
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authors.forename: Victor S C
authors.initials: VS
authors.lastname: Fung
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authors.forename: Russell C
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authors.lastname: Dale
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authors.forename: Fabienne
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authors.lastname: Brilot