Abstract
We examined the reactivity of monoclonal IgM of sera from patients with neuropathy and monoclonal IgM, with or without antibody activity to myelin-associated glycoprotein (MAG), as well as sera from non-neurologic patients with Waldenström's macroglobulinaemia, with various nerve glycolipids extracts or with purified gangliosides. As expected from previous studies, all (five cases) anti-MAG IgM stained two glycolipids, the chemical characteristics of which corresponded to sulphated glucuronyl-paragloboside (SGPG) and sulphated glucuronyl-lactosaminyl-paragloboside (SGLPG). Five of 12 sera from patients with neuropathy whose IgM was devoid of anti-MAG reactivity stained nerve extracts greatly enriched (98%) with SGPG and SGLPG. Three of these five sera reacted with additional glycolipids and/or gangliosides. Two of 16 sera from patients with macroglobulinaemia without neuropathy reacted strongly with both SGPG and SGLPG. The latter finding as well as the detection of low titre of anti-sphingolipid antibodies in normal sera may cast a doubt on the pathogenetic significance of this antibody activity.
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