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Changes of Serum IgG Dimer Levels after Treatment with IVIg in Guillain-Barré Syndrome

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Abstract

Intravenous immunoglobulins (IVIg) are standard treatment for Guillain-Barré syndrome (GBS). Their exact mechanisms of action are versatile and not fully understood. One possible mechanism is neutralization of circulating autoantibodies via binding to anti- idiotypic antibodies forming idiotype-anti-idiotype dimeric IgG immune complexes. To examine the role of immune complex formation as mechanism of action for IVIg in GBS, 34 C57Bl/6 mice were either treated with anti-ganglioside antibodies and IVIg or IVIg and PBS alone, whereas eight additional mice were treated either with anti-ganglioside autoantibodies and IVIg or anti-ganglioside autoantibodies alone. Subsequently IgG dimer formation was assessed by high performance liquid chromatography (HPLC) and enzyme- linked immunosorbent assay (ELISA). In addition, IgG dimer formation was measured in sera of eight GBS patients who were treated with IVIg. In mice, a significant increase of dimeric IgG after administration of anti-ganglioside antibodies and IVIg could be observed. Re-monomerized IgG dimers showed immunoreactivity against gangliosides and serum immunoreactivity was significantly reduced after IVIg infusion. Likewise also in GBS patients, IgG dimer formation could be detected after IVIg treatment. Our data indicate that dimeric IgG immune complexes contain anti-idiotypic antibodies and provide proof of concept that IVIg treatment in GBS results in measurable amounts of IgG dimers. Larger patient cohorts are needed to evaluate serum IgG dimer increase as a possible marker for treatment response in GBS.

Mechanism of action: Intravenous immunoglobulins (IVIg) and anti-ganglioside antibodies form dimeric IgG immune complexes, preventing axonal damage in Guillain-Barré Syndrome.

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Correspondence to Helmar C. Lehmann.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For animal experiments, all applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

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Written informed consent was obtained from all subjects participating in this study.

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Appendix

Appendix

Table 1 Hughes GBS disability score (modified after van Koningsveld et al. 2007, and Hughes et al. 1978)

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Svačina, M.K.R., Röth, P., Bobylev, I. et al. Changes of Serum IgG Dimer Levels after Treatment with IVIg in Guillain-Barré Syndrome. J Neuroimmune Pharmacol 14, 642–648 (2019). https://doi.org/10.1007/s11481-019-09871-0

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  • DOI: https://doi.org/10.1007/s11481-019-09871-0

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