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From the Neurosciences Group, Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom.
Supported by the Muscular Dystrophy Group of Great Britain, grant R03/406/1.
Received February 13, 1996. Accepted in final form April 17, 1996.
Address correspondence and reprint requests to Dr. D. Beeson, Neurosciences Group, Institute of Molecular Medicine, John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.
Immunoprecipitation of human acetylcholine receptor (AChR) is used in the diagnostic assay for myasthenia gravis (MG).We compared human AChR derived from TE671 cells, which express fetal-type AChR, with AChR from TE671-epsilon cells, which we have engineered to express adult-type AChR. Some low-titer MG sera distinguished strikingly between the two subtypes. Four out of seven MG sera that had equivocal titers in standard assays gave positive titers with TE671-epsilon AChR, whereas only one out of seven gave a positive titer with TE671 cells. The new cell line provides a greater concentration of adult AChR than can be obtained from normal human muscle and increases the sensitivity of the diagnostic assay.
NEUROLOGY 1996;47: 1552-1555
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