Patterns of reactivity of human anti-GM1 antibodies with spinal cord and motor neurons

Massimo Corbo, Angelo Quattrini, Alessandra Lugaresi, Maria Santoro, Norman Latov, Arthur P. Hays

Research output: Contribution to journalArticlepeer-review

Abstract

Human anti-GM1 antibodies from patients with lower motor neuron disease or predominantly motor neuropathy recognize carbohydrate determinants shared by GM1 and related glycolipids and glycoproteins, but the identity of the antigens to which they bind in tissue is unknown. We examined the binding of anti-GM1 antibodies with differing fine specificities to spinal cord, isolated motor neurons, and dorsal root ganglia neurons in order to characterize the tissue antigens. All anti-GM1 antibodies tested bound to the surface of bovine spinal motor neurons and immunostained the gray matter of unfixed sections of spinal cord. The staining was blocked by cholera toxin, which is specific for GM1, indicating that GM1 itself was the target antigen. Binding to white matter was more variable and depended on fixation and the fine specificities of the antibodies. The anti-GM1 antibodies did not bind to dorsal root ganglia neurons in tissue sections or in culture. These studies suggest that the autoantibodies might exert their effect, in part, by binding to GM1 on the surface of motor neurons, and that the absence of binding to dorsal root ganglia neurons might explain the lack of sensory abnormalities in affected patients.

Original languageEnglish
Pages (from-to)487-493
Number of pages7
JournalAnnals of Neurology
Volume32
Issue number4
Publication statusPublished - Oct 1992

ASJC Scopus subject areas

  • Neuroscience(all)

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