Summary
The presence of antibodies to glycosylated albumin was studied by means of a newly developed sandwich enzyme-linked immunosorbent assay in 29 long-standing Type 1 (insulin-dependent) diabetic patients with microvascular complications and in 20 normal subjects. Two types of antibody reactivity were detected. One directed against glucitol-albumin expressing G and M isotypes. The second, predominantly belonging to the IgG class, reacted with an epitope shared by non-glycosylated albumin and the ketoamine adduct of albumin glycosylation. Both types of antibodies, with affinity constant ranging from 104 to 107 (mol/l)−1 were found in normal and diabetic subjects, but higher litres were significantly more prevalent in the diabetic patients. These antibodies may represent the result of immune tolerance breakdown or, alternatively, be natural antibodies. Although their function remains to be established, their raised prevalence in Type 1 diabetes may be relevant to diabetic microvascular disease.
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Mangili, R., Viberti, G.C. & Vergani, D. Antibodies to human albumin epitopes in Type 1 (insulin-dependent) diabetes mellitus. Diabetologia 31, 639–646 (1988). https://doi.org/10.1007/BF00278745
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DOI: https://doi.org/10.1007/BF00278745