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Journal of Neuroinflammation
Published in: Journal of Neuroinflammation 1/2014

Open Access 01-12-2014 | Research

Aquaporin-4 antibody testing: direct comparison of M1-AQP4-DNA-transfected cells with leaky scanning versus M23-AQP4-DNA-transfected cells as antigenic substrate

Authors: Sven Jarius, Friedemann Paul, Kai Fechner, Klemens Ruprecht, Ingo Kleiter, Diego Franciotta, Marius Ringelstein, Florence Pache, Orhan Aktas, Brigitte Wildemann

Published in: Journal of Neuroinflammation | Issue 1/2014

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Abstract

Background

Neuromyelitis optica (NMO, Devic syndrome) is associated with antibodies to aquaporin-4 (NMO-IgG/AQP4-Ab) in the majority of cases. NMO-IgG/AQP4-Ab seropositivity in patients with NMO and its spectrum disorders has important differential diagnostic, prognostic and therapeutic implications. So-called cell-based assays (CBA) are thought to provide the best AQP4-Ab detection rates.

Objective

To compare directly the AQP4-IgG detection rates of the currently most widely used commercial CBA, which employs cells transfected with a full-length (M1)-human AQP4 DNA in a fashion that allows leaky scanning (LS) and thus expression of M23-AQP4 in addition to M1-AQP, to that of a newly developed CBA from the same manufacturer employing cells transfected with human M23-AQP4-DNA.

Methods

Results from 368 serum samples that had been referred for routine AQP4-IgG determination and had been tested in parallel in the two assays were compared.

Results

Seventy-seven out of 368 samples (20.9%) were positive for NMO-IgG/AQP4-Ab in at least one assay. Of these, 73 (94.8%) were positive in both assays. A single sample (1.3%) was exclusively positive in the novel assay; three samples (3.9%) were unequivocally positive only in the ‘classic’ assay due to high background intensity in the novel assay. Both median fluorescence intensity and background intensity were higher in the new assay.

Conclusions

This large study did not reveal significant differences in AQP4-IgG detection rates between the ‘classic’ CBA and a new M23-DNA-based CBA. Importantly, our results largely re-affirm the validity of previous studies that had used the ‘classic’ AQP4-CBA to establish NMO-IgG/AQP4-Ab seropositivity rates in NMO and in a variety of NMO spectrum disorders.
Appendix
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Metadata
Title
Aquaporin-4 antibody testing: direct comparison of M1-AQP4-DNA-transfected cells with leaky scanning versus M23-AQP4-DNA-transfected cells as antigenic substrate
Authors
Sven Jarius
Friedemann Paul
Kai Fechner
Klemens Ruprecht
Ingo Kleiter
Diego Franciotta
Marius Ringelstein
Florence Pache
Orhan Aktas
Brigitte Wildemann
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2014
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/1742-2094-11-129

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