Abstract
A serum containing a monoclonal IgM λ with anti-GM1 and anti-GD1b activity was obtained from a patient with upper motor neuron syndrome. By indirect immunocytochemical techniques with double staining, the patient's IgM strongly stained membranes of neurons in primary cultures of fetal central and peripheral nervous system. It was cytotoxic for neurons in two human neuroblastoma established cell lines in a complement-dependent chromium release assay. These results are in keeping with the hypothesis of a direct pathogenetic role of such monoclonal anti-GM1 and GD1b IgM antibodies.
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