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Polyneuropathy associated with IgA monoclonal gammopathy: a hypothesis of its pathogenesis

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Summary

We describe three patients with chronic progressive polyneuropathy associated with IgA monoclonal gammopathy. Two patients had a prominent sensory neuropathy and one had a prominent motor neuropathy. Sural nerve biopsies showed axonal degeneration in all cases. In immunocytochemical studies patients' IgG immunostained axons. By Western immunoblot a band of IgG reactivity with an axonal protein of 66 kDa was found. No band of IgA and IgM were found. We suggest the possibility that the IgA monoclonal protein may act as a stimulating factor of preexisting B cell clones eliciting an immune reaction against nerve antigens.

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Correspondence to R. Nemui.

Additional information

Supported by grants from Istituto Scientifico S. Raffaele, Milan

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Nemui, R., Mamoli, A., Fazio, R. et al. Polyneuropathy associated with IgA monoclonal gammopathy: a hypothesis of its pathogenesis. Acta Neuropathol 81, 371–376 (1991). https://doi.org/10.1007/BF00293456

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Key words

  • Neuropathy
  • Monoclonal gammopathy
  • Autoimmunity