Abstract
Neuromyelitis optica (NMO) or Devic's disease is an inflammatory neurologic disease characterized by severe optic neuritis and transverse myelitis. Other features of NMO include female preponderance, higher onset age, severe functional disability, longitudinally extensive spinal cord lesions (longer than 3 vertebral segments), and oligoclonal IgG bands negativity. Brain lesions are not uncommon in NMO. The relation between NMO and multiple sclerosis (MS) has long been a matter of controversy, but since the discovery of anti-aquaporin 4 (AQP4) antibody (NMO-IgG), an NMO-specific autoantibody, the clinical, MRI, and laboratory features that distinguish NMO from MS have been clarified. Anti-AQP4 antibody binds to the extracellular domain of AQP4, which is highly expressed in endfeet of astrocytes. Recent neuropathological studies, analysis of CSF-GFAP levels during relapse and experimental studies strongly suggest that NMO is an anti-AQP4 antibody-mediated astrocytopathic disease and that T cell-mediated CNS inflammation is necessary to develop NMO. Also, IL-6 is remarkably elevated in the CSF and appears to regulate plasmablasts to produce anti-AQP4 antibody. Therefore, from the therapeutic point of view, depletion of anti-AQP4 a...Continue Reading
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