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  • Title: Insulin receptor antibodies in diabetes mellitus.
    Author: Batarseh H, Thompson RA, Odugbesan O, Barnett AH.
    Journal: Clin Exp Immunol; 1988 Jan; 71(1):85-90. PubMed ID: 3280181.
    Abstract:
    Sera from 80 subjects with IDDM and NIDDM, together with sera from 20 patients with miscellaneous autoimmune conditions and 20 healthy adult subjects were tested for insulin receptor antibodies by (1) inhibition of 125I-insulin binding to EBV-transformed lymphoid cells, and by (2) immunoprecipitation of solubilized insulin receptors in the presence of an excess of mono-specific anti-human IgG or IgM; this test allowed the assessment of the class of antibody activity. Anti-insulin antibodies in the sera were also measured using a double antibody technique. Anti-insulin receptor antibodies were found in 13 of 33 subjects with IDDM and six of 47 with NIDDM. These were principally in the IgM class, and in both groups of diabetics there was a good correlation between % inhibition of insulin binding to intact cells, and % of antibody precipitated by IgM (P less than 0.001), but not by IgG (P greater than 0.1). There was also a good correlation between the % inhibition of insulin binding to intact cells and the daily dose of insulin used in treatment (P less than 0.001). Insulin antibodies were found in seven of 33 subjects with IDDM and six of 12 with NIDDM, all of whom were on insulin treatment. These six subjects were the only ones with NIDDM who also had anti-insulin receptor antibody activity, suggesting that such antibodies may represent auto-anti-idiotype activity. This study shows that autoimmunity in insulin dependent (Type I) diabetes is not limited to islet cells and that such patients also develop antibodies to the insulin receptor. While three out of five patients with relative insulin resistance (requirement greater than 90 u/day) also showed evidence of insulin receptor antibody activity, the clinical significance of these antibodies has yet to be determined.
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