Myasthenia gravis and acetylcholine receptor. Effect of steroids in clinical course and cellular immune response to acetylcholine receptor.

Archives of Neurology
O AbramskyS Fuchs

Abstract

Lymphocytes from patients with myasthenia gravis (MG) were transformed when cultured in vitro with an acetylcholine receptor fraction extracted from the electric organ of an electric eel. Marked diminution of the cellular response to acetylcholine was shown in patients who improved clinically with prednisone treatment. The transient clinical deterioration during the first days of prednisone treatment was accompanied by a transient increase in lymphocyte response. These findings that an in vivo sensitization of lymphocytes to self-acetylcholine receptor may occur in MG, and that a cell-mediated autoimmune mechanism may be important in the pathogenesis of the neuromuscular block. The present observations indicate that prednisone provides a measure of immunosuppression in MG. The transient clinical deterioration during the first days of prednisone therapy may reflect an enhancement of cell reactivity by this drug.

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