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Title: IgM anti-idiotypes that block anti-HLA antibodies: naturally occurring or immune antibodies? Author: Urlacher A, Tongio MM, Pasquali JL. Journal: Clin Exp Immunol; 1991 Jan; 83(1):116-20. PubMed ID: 1703054. Abstract: Using dithiothreitol (DTT) technique, IgM anti-HLA anti-idiotypic antibodies were detected in a multiparous multitransfused woman. These antibodies were able to inhibit the binding of specific IgG anti-HLA antibodies on their corresponding antigen. The recognized determinants were cross-reactive determinants since they were partially found on anti-HLA antibodies from unrelated individuals. By studying the patient's sera over a period of 2 years, no IgM-IgG switch was observed but the presence of these antibodies was stable in time, despite the disappearance of the idiotypes (anti-HLA antibodies). However, when looking at the patient's earlier serum, it was shown that these IgM anti-idiotypic antibodies were absent from the first available serum. Thus, these anti-idiotypic antibodies seem to behave both like natural and immune antibodies. The incidence of such antibodies in pretransplant patients is discussed.[Abstract] [Full Text] [Related] [New Search]