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Detection and characterization of MuSK antibodies in seronegative myasthenia gravis

Detection and characterization of MuSK antibodies in seronegative myasthenia gravis Antibodies to rat muscle specific kinase, MuSK, have recently been identified in some generalized “seronegative” myasthenia gravis (SNMG) patients, who are often females with marked bulbar symptoms. Using immunoprecipitation of 125I‐labelled‐human MuSK, 27 of 66 (41%) seronegative patients were positive, but 18 ocular SNMG patients, 105 AChR antibody positive MG patients, and 108 controls were negative. The antibodies are of high affinity (Kds around 100 pM) with titers between 1 and 200 nM. They bind to the extracellular Ig‐like domains of soluble or native MuSK. Surprisingly they are predominantly in the IgG4 subclass. MuSK‐antibody associated MG may be differnet in etiological and pathological mechanisms. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annals of Neurology Wiley

Detection and characterization of MuSK antibodies in seronegative myasthenia gravis

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References (35)

Publisher
Wiley
Copyright
Copyright © 2004 American Neurological Association
ISSN
0364-5134
eISSN
1531-8249
DOI
10.1002/ana.20061
pmid
15048899
Publisher site
See Article on Publisher Site

Abstract

Antibodies to rat muscle specific kinase, MuSK, have recently been identified in some generalized “seronegative” myasthenia gravis (SNMG) patients, who are often females with marked bulbar symptoms. Using immunoprecipitation of 125I‐labelled‐human MuSK, 27 of 66 (41%) seronegative patients were positive, but 18 ocular SNMG patients, 105 AChR antibody positive MG patients, and 108 controls were negative. The antibodies are of high affinity (Kds around 100 pM) with titers between 1 and 200 nM. They bind to the extracellular Ig‐like domains of soluble or native MuSK. Surprisingly they are predominantly in the IgG4 subclass. MuSK‐antibody associated MG may be differnet in etiological and pathological mechanisms.

Journal

Annals of NeurologyWiley

Published: Apr 1, 2004

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