Different Complement Activation Patterns Following C5 Cleavage in MOGAD and AQP4-IgG+NMOSD.

Neurol Neuroimmunol Neuroinflamm

From the Department of Neurology (K.K., H.K., Y.M., N.S., N. Yamazaki, N. Yamamoto, S.U., C.N., H.O., Y.T., T.T., K.F., T.M., M.A.), Tohoku University Graduate School of Medicine, Sendai, Japan; Multiple Sclerosis and Neuromyelitis Optica Center (H.K., K.F.), Southern TOHOKU Research Institute for Neuroscience, Koriyama; Department of Multiple Sclerosis Therapeutics (H.K., K.F.), Fukushima Medical University, Fukushima, Japan; Department of Neurology (T.T.), NHO Yonezawa National Hospital, Yamagata, Japan; Division of Neurology (J.F., I.N.), Tohoku Medical and Pharmaceutical University, Sendai, Japan; Department of Neurology (Y.H.), Japanese Redcross Maebashi Hospital; Department of Neurology (Y.H.), Mihara Memorial Hospital, Isesaki, Japan; and Center for Brain Research (H.L.), Medical University of Vienna, Austria.

Published: September 2024

Objectives: In myelin oligodendrocyte glycoprotein IgG-associated disease (MOGAD) and aquaporin-4 IgG+ neuromyelitis optica spectrum disorder (AQP4+NMOSD), the autoantibodies are mainly composed of IgG1, and complement-dependent cytotoxicity is a primary pathomechanism in AQP4+NMOSD. We aimed to evaluate the CSF complement activation in MOGAD.

Methods: CSF-C3a, CSF-C4a, CSF-C5a, and CSF-C5b-9 levels during the acute phase before treatment in patients with MOGAD (n = 12), AQP4+NMOSD (n = 11), multiple sclerosis (MS) (n = 5), and noninflammatory neurologic disease (n = 2) were measured.

Results: CSF-C3a and CSF-C5a levels were significantly higher in MOGAD (mean ± SD, 5,629 ± 1,079 pg/mL and 2,930 ± 435.8 pg/mL) and AQP4+NMOSD (6,017 ± 3,937 pg/mL and 2,544 ± 1,231 pg/mL) than in MS (1,507 ± 1,286 pg/mL and 193.8 ± 0.53 pg/mL). CSF-C3a, CSF-C4a, and CSF-C5a did not differ between MOGAD and AQP4+NMOSD while CSF-C5b-9 (membrane attack complex, MAC) levels were significantly lower in MOGAD (17.4 ± 27.9 ng/mL) than in AQP4+NMOSD (62.5 ± 45.1 ng/mL, = 0.0019). Patients with MOGAD with severer attacks (Expanded Disability Status Scale [EDSS] ≥ 3.5) had higher C5b-9 levels (34.0 ± 38.4 ng/m) than those with milder attacks (EDSS ≤3.0, 0.9 ± 0.7 ng/mL, = 0.044).

Discussion: The complement pathway is activated in both MOGAD and AQP4+NMOSD, but MAC formation is lower in MOGAD, particularly in those with mild attacks, than in AQP4+NMOSD. These findings may have pathogenetic and therapeutic implications in MOGAD.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11379436PMC
http://dx.doi.org/10.1212/NXI.0000000000200293DOI Listing

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