title: Paraneoplastic disorders of eye movements.
abstract: Paraneoplastic syndromes affecting the brainstem and cerebellum are reported to cause a variety of abnormalities of eye movements. Recent studies have begun to account for the mechanisms underlying several syndromes, characterized by opsoclonus, slow, or dysmetric saccades, as well as downbeat nystagmus. We provide evidence that upbeat nystagmus in a female patient with pancreatic cancer reflected a cerebellar-induced imbalance of otolithic pathways: she showed marked retropulsion, and her nystagmus was dependent on head position, being absent when supine, and suppressed with convergence. In addition to anti-Hu antibodies, we demonstrated antibodies to a novel neuronal cell surface antigen. Taken with other recent studies, our findings suggest that paraneoplastic syndromes arise due to antibodies against surface neuronal antigens, including receptors and channels. Abnormal eye movements in paraneoplastic syndromes offer insights into the pathogenesis of these disorders and the opportunity to test potential therapies, such as new drugs with effects on neuronal channels.
authors.affiliation: Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA. wray@helix.mgh.harvard.edu
authors.forename: Shirley H
authors.initials: SH
authors.lastname: Wray
authors.forename: Josep
authors.initials: J
authors.lastname: Dalmau
authors.forename: Athena
authors.initials: A
authors.lastname: Chen
authors.forename: Susan
authors.initials: S
authors.lastname: King
authors.forename: R John
authors.initials: RJ
authors.lastname: Leigh
mesh_terms: D000368:Aged; D000954:Antigens, Surface; D001323:Autoantibodies / Q000378:metabolism; D051959:ELAV Proteins; D005260:Female; D006801:Humans; D009474:Neurons / Q000276:immunology; D009759:Nystagmus, Pathologic / Q000209:etiology / Q000503:physiopathology; D015835:Ocular Motility Disorders / Q000209:etiology* / Q000503:physiopathology*; D010190:Pancreatic Neoplasms / Q000150:complications / Q000503:physiopathology; D010257:Paraneoplastic Syndromes / Q000150:complications* / Q000503:physiopathology*
chemical_list: D000954:Antigens, Surface; D001323:Autoantibodies; D051959:ELAV Proteins