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Erschienen in: Acta Neuropathologica 6/2012

01.06.2012 | Original Paper

Neuromyelitis optica IgG and natural killer cells produce NMO lesions in mice without myelin loss

verfasst von: Julien Ratelade, Hua Zhang, Samira Saadoun, Jeffrey L. Bennett, Marios C. Papadopoulos, A. S. Verkman

Erschienen in: Acta Neuropathologica | Ausgabe 6/2012

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Abstract

The pathogenesis of neuromyelitis optica (NMO) involves targeting of NMO-immunoglobulin G (NMO-IgG) to aquaporin-4 (AQP4) on astrocytes in the central nervous system. Prior work provided evidence for complement-dependent cytotoxicity (CDC) in NMO lesion development. Here, we show that antibody-dependent cellular cytotoxicity (ADCC), in the absence of complement, can also produce NMO-like lesions. Antibody-dependent cellular cytotoxicity was produced in vitro by incubation of mouse astrocyte cultures with human recombinant monoclonal NMO-IgG and human natural killer cells (NK-cells). Injection of NMO-IgG and NK-cells in mouse brain caused loss of AQP4 and GFAP, two characteristic features of NMO lesions, but little myelin loss. Lesions were minimal or absent following injection of: (1) control (non-NMO) IgG with NK-cells; (2) NMO-IgG and NK-cells in AQP4-deficient mice; or (3) NMO-IgG and NK-cells in wild-type mice together with an excess of mutated NMO-IgG lacking ADCC effector function. NK-cells greatly exacerbated NMO lesions produced by NMO-IgG and complement in an ex vivo spinal cord slice model of NMO, causing marked myelin loss. NMO-IgG can thus produce astrocyte injury by ADCC in a complement-independent and dependent manner, suggesting the potential involvement of ADCC in NMO pathogenesis.
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Metadaten
Titel
Neuromyelitis optica IgG and natural killer cells produce NMO lesions in mice without myelin loss
verfasst von
Julien Ratelade
Hua Zhang
Samira Saadoun
Jeffrey L. Bennett
Marios C. Papadopoulos
A. S. Verkman
Publikationsdatum
01.06.2012
Verlag
Springer-Verlag
Erschienen in
Acta Neuropathologica / Ausgabe 6/2012
Print ISSN: 0001-6322
Elektronische ISSN: 1432-0533
DOI
https://doi.org/10.1007/s00401-012-0986-4

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