A human monoclonal IgM with autoantibody activities against heparan sulphate and the mitotic spindle

Clinical and Experimental Immunology
B RousselC Micouin

Abstract

A monoclonal IgM kappa from a patient with Waldenström's macroglobulinaemia (IgM-Rod) was found to react at temperatures below 28 degrees C with all tissue basement membranes and the cell coat of non-haematopoietic cells. IgM-Rod antibody was directed against heparan sulphate side chains of heparan sulphate proteoglycans as shown by binding in a solid-phase ELISA to heparan sulphate glycosaminoglycans but not to other purified subcomponents of the extracellular matrix; and by specific inhibition of the observed reactivity by heparitinase treatment. IgM-Rod showed cross-reactivity by indirect immunofluorescence with an as yet unidentified structure expressed in the nucleus during cell division and becoming associated with the mitotic spindle apparatus. The co-existence of both binding activities for heparan sulphate and nuclei determinants in the same IgM molecule was deduced from adsorption-elution experiments and from the inhibitory effect of a mouse monoclonal anti-idiotypic antibody directed against the paratope of IgM-Rod.

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Citations

May 4, 1992·Annals of the New York Academy of Sciences·A C Allison, Y Nawata
Mar 1, 1993·Arteriosclerosis and Thrombosis : a Journal of Vascular Biology·C DenisD Meyer
Aug 1, 1992·British Journal of Haematology·J ArvieuxM G Colomb

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