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Identification and Characterization of Gangliosides Reacting with IgM Paraproteins in Three Patients with Neuropathy Associated with Biclonal Gammopathy
Author(s) -
Ilyas Amjad A.,
Willison Hugh J.,
Dalakas Marinos C.,
Whitaker John N.,
Quarles Richard H.
Publication year - 1988
Publication title -
journal of neurochemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.75
H-Index - 229
eISSN - 1471-4159
pISSN - 0022-3042
DOI - 10.1111/j.1471-4159.1988.tb01821.x
Subject(s) - paraproteins , identification (biology) , medicine , gammopathy , pathology , immunology , antibody , biology , monoclonal , monoclonal antibody , botany
Abstract: IgM monoclonal antibodies from three patients with polyneuropathy associated with biclonal gammopathy reacted with monosialoganglioside GM1 on thin‐layer chromatograms. An IgM paraprotein in one of the patients with a predominantly motor neuropathy also reacted strongly with the ganglioside GD1b and asialo‐GM1. All three of these antigenic lipids have a Gal(β1–3)GalNAc moiety in common which would appear to be the antigenic determinant. However, this IgM also cross‐reacted weakly with paragloboside which has an N ‐acetyllactosaminyl [Gal(β1–4)GlcNAc] terminal structure. The specificity of the other paraprotein in this patient is not known. The IgM paraproteins reacting with GM1 in both of the other patients exhibited different specificity because they did not react with GD1 b and asialo‐GM1, but reacted strongly with GM2 ganglioside. The data suggest that the epitope for both of these IgMs is in the GalNAc(β31–4)(NeuAcα2–3)Gal(β1–4)Glc region of the gangliosides that is common to both GM2 and GM1. The second IgM paraproteins in both of these latter patients react with the myelin‐associated glycoprotein (MAG) and two 3‐sulfoglucuronyl glycolipids that share antigenic determinants with MAG.