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Immune complexes and diabetic microangiopathy

W J Irvine, U Di Mario, K Guy

    Journal of Clinical & Laboratory Immunology
    |November 1, 1978
    PubMed
    Summary
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    Soluble immune complexes (AgAb) are elevated in diabetics with retinopathy, regardless of treatment. These immune complexes may play a role in diabetic microangiopathy development.

    Area of Science:

    • Immunology
    • Endocrinology
    • Ophthalmology

    Background:

    • Diabetic microangiopathy is a serious complication of diabetes mellitus.
    • The role of soluble immune complexes (AgAb) in diabetic retinopathy pathogenesis is not fully understood.

    Purpose of the Study:

    • To investigate the presence and levels of soluble immune complexes (AgAb) in diabetic patients with varying stages of retinopathy.
    • To compare different assay methods for AgAb detection in diabetes.

    Main Methods:

    • Quantification of soluble immune complexes (AgAb) using the solid phase C1q assay (Clq-SP) and the Raji cell assay (RAJI).
    • Comparison of AgAb levels in diabetic patients (with and without retinopathy, varying durations, and treatments) against a normal population.
    • Correlation analysis of AgAb with insulin antibodies in insulin-treated diabetics.

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    Main Results:

    • Elevated AgAb levels were observed in long-duration diabetics with proliferative retinopathy and short-duration diabetics with early retinopathy, compared to controls.
    • AgAb levels increased with retinopathy severity in long-term diabetics (statistically significant for Clq-SP).
    • Raji cell assay showed comparable results, but differences were less pronounced and not statistically significant.

    Conclusions:

    • Soluble immune complexes (AgAb), detected by Clq-SP and RAJI assays, are increased in diabetic retinopathy.
    • AgAb may contribute to the pathogenesis of diabetic microangiopathy, independent of insulin antibodies.