Aquaporin-4 Antibody Testing in Neuromyelitis Optica
Summary
Neuromyelitis Optica Spectrum Disorder (NMOSD) is a severe inflammatory condition of the central nervous system that principally affects the optic nerves and spinal cord. The discovery that autoantibodies against the water channel protein Aquaporin-4 (AQP4) are highly specific for NMOSD has revolutionised diagnosis, enabling earlier and more reliable discrimination from multiple sclerosis and other demyelinating diseases. AQP4-IgG testing now underpins revised international diagnostic criteria, guiding treatment decisions and prognostic assessment. Multiple assay formats are available, each balancing sensitivity, specificity, accessibility and cost. Cell-based assays presenting full-length human AQP4 in its native conformation achieve the highest accuracy, while techniques such as indirect immunofluorescence, enzyme-linked immunosorbent assay and emerging point-of-care methods extend access in diverse clinical settings. Ongoing refinements aim to standardise assay performance, facilitate remote sampling and allow quantitative monitoring of antibody titre in relation to disease activity, severity and treatment response. Global efforts are directed towards harmonising protocols and improving affordability, thereby broadening the availability of AQP4 testing in resource-limited settings and enhancing patient outcomes worldwide.
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Aquaporin-4 Antibody Testing in Neuromyelitis Optica publication trend
The graph below shows the total number of articles in aquaporin-4 antibody testing in neuromyelitis optica across all publications each year (not limited to Nature Index journals).
Technical terms
Aquaporin-4 (AQP4): A membrane water channel protein expressed on astrocyte end-feet, targeted by autoantibodies in NMOSD.
NMOSD: Neuromyelitis Optica Spectrum Disorder, an autoimmune demyelinating disease characterised by optic neuritis and transverse myelitis.
Cell-based assay (CBA): A diagnostic test using live cells expressing full-length AQP4 to detect circulating autoantibodies with high sensitivity and specificity.
Enzyme-linked immunosorbent assay (ELISA): A plate-based biochemical technique that quantifies antibodies in serum through a colourimetric reaction.
Dried blood spot (DBS): A sampling method in which capillary blood is collected onto filter paper, dried and analysed remotely, facilitating decentralised testing.
Seropositivity: The presence of specific antibodies in the blood, indicating an immune response to the target antigen.
References
- Dried blood spot improves global access to aquaporin‐4‐IgG testing for neuromyelitis optica. Annals of Clinical and Translational Neurology (2024).
- AQP4 Antibody Assay Sensitivity Comparison in the Era of the 2015 Diagnostic Criteria for NMOSD. Frontiers in Neurology (2019).
- Antibody to Aquaporin 4 in the Diagnosis of Neuromyelitis Optica. PLOS Medicine (2007).
- Serum Aquaporin 4-Immunoglobulin G Titer and Neuromyelitis Optica Spectrum Disorder Activity and Severity: A Systematic Review and Meta-Analysis. Frontiers in Neurology (2021).
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