Elsevier

The Lancet

Volume 343, Issue 8895, 19 February 1994, Pages 454-455
The Lancet

Short reports
Serum factor in Miller-Fisher variant of Guillain-Barré syndrome and neurotransmitter release

https://doi.org/10.1016/S0140-6736(94)92694-8Get rights and content

Abstract

Serum IgG autoantibodies to GQ1b ganglioside are associated with the acute phase of the Miller-Fisher syndrome (MFS). We investigated the effects of three anti-GQ1b-positive MFS sera in the mouse phrenic-nerve/diaphragm preparation. Miniature endplate potential frequencies increased eight-fold within 25 min, declined rapidly, and ceased altogether after 3 h, when nerve stimulation no longer evoked a response. One MFS convalescent serum (anti-GQ1b negative) and sera from healthy controls and from patients with other neurological diseases were without effect. Thus muscle weakness in MFS may be caused by a serum factor, likely to be GQ1b antibody, that leads to failure of acetylcholine release from motor nerve terminals.

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    Some of the features of MF syndrome resemble myasthenia gravis and for this reason the neuromuscular junction appeared worth of study to see if GQ1b antibodies might influence neuromuscular junction function in a separate and novel way to anti-acetyl choline receptor antibodies. Two separate studies found abnormalities in vitro in neuromuscular junction preparations mediated by the serum of patients with MFS (Roberts, Willison et al., 1994; Plomp, Molenaar et al., 1999) and also by monoclonal antibodies against GQ1b(Goodyear, O'Hanlon et al., 1999). Such monoclonal antibodies could be seen to fix complement and cause NM junction disruption in the experimental model (Goodyear, O'Hanlon et al., 1999).

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    That there was no effect could be explained by the need for prolonged application of the antibody to its epitope to exert its effect. However, some researchers99–101 have shown that antibodies to GQ1b cause initial massive excitation and eventual conduction block at the GQ1b-rich motor-nerve terminals in the mouse phrenic nerve-diaphragm preparation. Most recently, both monoclonal mouse antibodies to GD1a and serum from a patient with AMAN containing antibodies to GD1a were shown to cause excitation and eventual conduction block of motor axons in the same preparation from mice over-expressing GD1a.102

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