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- W2045821346 abstract "Amiodarone has been implicated as a cause of thrombocytopenia but the responsible mechanism is unknown. We performed studies in three patients to characterize the pathogenesis of this complication. No amiodarone-dependent, platelet-reactive antibodies were identified using conventional serological techniques. However, water-insoluble amiodarone solubilized in methanol and diluted to 1·0 mg/ml in aqueous buffer reproducibly promoted binding of IgG antibodies in patient serum to platelets. Solid phase assays identified drug-dependent antibodies specific for platelet glycoproteins (GP)Ia/IIa (integrin α2β1) in each patient and a second antibody specific for GPIIb/IIIa (αIIbβ3 integrin) in one patient. When studied by ion mobility analysis and transmission electron microscopy, the serologically active amiodarone preparation, a milky suspension, was found to consist of particles 2–30 nm in diameter, typical of a coacervate, a state characteristic of amiodarone in aqueous medium. The findings provide evidence that thrombocytopenia in the three patients studied was caused by drug-dependent antibodies specific for platelet glycoproteins GPIa/IIa and/or GPIIb/IIIa. We postulate that, in vivo, amiodarone may become incorporated into occult lipophilic domains in platelet glycoproteins, producing structural modifications that are immunogenic in some individuals, and that the resulting antibodies can cause platelet destruction in a person taking this drug." @default.
- W2045821346 created "2016-06-24" @default.
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- W2045821346 date "2013-08-01" @default.
- W2045821346 modified "2023-10-03" @default.
- W2045821346 title "Acute thrombocytopenia in patients treated with amiodarone is caused by antibodies specific for platelet membrane glycoproteins" @default.
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- W2045821346 doi "https://doi.org/10.1111/bjh.12521" @default.
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