Clinical Usefulness of Cell-based Indirect Immunofluorescence Assay for the Detection of Aquaporin-4 Antibodies in Neuromyelitis Optica Spectrum Disorder Eun-suk Kang, M.D.,1 Ju-Hong Min, M.D.,2 Kwang Ho Lee, M.D.,2 and Byoung Joon Kim, M.D.2 Author information ? Article notes ? Copyright and License information ? Go to: Abstract. Background The presence of antibodies to aquaporin-4 (AQP4) has been identified as a key characteristic of neuromyelitis optica spectrum disorder (NMOSD), an autoimmune inflammatory demyelinating central nervous system (CNS) disorder. We evaluated the performance of a cell-based indirect immunofluorescence assay (CIIFA) for detecting AQP4 antibodies using antigen prepared with a recombinant AQP4 peptide transfection technique and assessed the usefulness of CIIFA for diagnosis of NMOSD in routine clinical practice.
Anti-aquaporin-4 antibody in Chinese patients with central nervous system inflammatory demyelinating disorders. Long Y, Qiu W, Hu X, Peng F, Lu Z, Wang Y, Yang Y. Source Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University, 600 Tianhe Road, Guangzhou 510630, Guangdong Province, People’s Republic of China; Department of Neurology, Clinical College, The First Affiliated Hospital of Guangdong Pharmaceutical University, 19 Nonglinxia Road, Guangzhou 510080, Guangdong Province, People’s Republic of China.
Cerebrospinal Fluid BAFF and APRIL Levels in Neuromyelitis Optica and Multiple Sclerosis Patients During Relapse. Wang H, Wang K, Zhong X, Qiu W, Dai Y, Wu A, Hu X. Source Department of Neurology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
Quantification and Functional Characterization of Antibodies to Native Aquaporin 4 in Neuromyelitis Optica Sudhakar Reddy Kalluri, MSc; Zsolt Illes, MD; Rajneesh Srivastava, MSc; Bruce Cree, MD; Til Menge, MD; Jeffrey L. Bennett, MD, PhD; Achim Berthele, MD; Bernhard Hemmer, MD Arch Neurol.
Autoantibodies against astrocyte water channel aquaporin-4 (AQP4) are highly specific for the neuroinflammatory disease neuromyelitis optica (NMO). We measured the binding of NMO autoantibodies to AQP4 in human astrocyte-derived U87MG cells expressing M1 and/or M23 AQP4, or M23 mutants that do not form orthogonal array of particles (OAPs).
Neuromyelitis optica spectrum disorders (NMOSD) are associated with anti-aquaporin-4 autoantibodies (AQP4-IgG). Limited data is available on longitudinal cerebrospinal fluid (CSF) AQP4-IgG and their relation to disease activity and inflammatory parameters. AQP4-IgG titers were measured in matched longitudinal serum and CSF samples of 12 patients with NMOSD by an immunofluorescence assay and correlated with clinical parameters
BACKGROUND: Antibodies targeting membrane proteins play an important role in various autoimmune diseases of the nervous system.
Background: Neuromyelitis optica (NMO) is characterized by severe optic neuritis and transverse myelitis. A disease-specific autoantibody against aquaporin (AQP) 4, mainly expressed in astrocytic foot processes, was found in the sera from patients with NMO.
INTRODUCTION: The description of a highly sensitive and specific biomarker for neuromyelitis optica (NMO-IgG/aquaporin-4 antibody) extended the clinical spectrum of NMO to limited forms such as optic neuritis (ON) and longitudinally extensive myelitis (LEM). OBJECTIVE: To asses the sensitivity and specificity of our assay, and to describe the clinical characteristics of the patients who were tested for NMO-IgG. METHODS: NMO-IgG was analysed by immunohistochemistry and confirmed by assay on HEK cells transfected with aquaporin-4.
BACKGROUND: Neuromyelitis optica (NMO), a severe demyelinating disease, represents itself with optic neuritis and longitudinally extensive transverse myelitis. Serum NMO-IgG autoantibodies (Abs), a specific finding in NMO patients, target the water channel protein aquaporin-4 (AQP4), which is expressed as a long (M-1) or a short (M-23) isoform.
BACKGROUND: Recently, a highly specific serum autoantibody was discovered in patients with neuromyelitis optica, called NMO-IgG, and aquaporin-4, the most abundant water channel in the CNS, was identified as the target antigen.
The detection of antibodies against aquaporin-4 (AQP4) has improved the diagnosis of neuromyelitis optica (NMO). We evaluated a recently established cell-based anti-AQP4 assay in 273 patients with inflammatory CNS demyelination. The assay had a specificity of 99% and a sensitivity of 56% to detect all NMO patients and of 74% to detect the recurrent NMO patients, similar to the initial studies reported.