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  • Title: Abnormal levels of serum antielastin antibodies in children with diabetes mellitus type 1.
    Author: Nicoloff G, Weiss AS, Iotova V, Tzaneva V, Petrova C, Domuschieva N, Nikolov A, Tzvetanov P, Christova P.
    Journal: J Investig Med; 2006 Dec; 54(8):461-7. PubMed ID: 17169270.
    Abstract:
    Antibodies to alpha-elastin (elastin breakdown product) and elastin sequences devoid of cross-linked regions (linear elastin) are found in the serum of all human subjects and correlate with their respective serum peptide levels. The aim of this study was to determine if the serum level of antielastin antibodies (AEAbs) differs between type 1 diabetic children and nondiabetic children. Enzyme-linked immunosorbent assay was used to measure the levels of immunoglobulin (Ig)G and IgM AEAbs in the sera of 45 diabetic children (mean age 12.8 +/- 3.2 years, diabetes duration 5.3 +/- 3.6 years). Twenty-two children presented with vascular complications (group 1), whereas 23 displayed no vascular complications (group 2). The controls were 18 healthy children (mean age 11.9 +/- 2.3 years). Diabetic patients showed statistically significant higher levels of IgM alpha-AEAbs (0.82 +/- 0.26 vs 0.61 +/- 0.14, p = .0013) than the control group. In group 1, alpha-AEAbs showed statistically significant higher level than controls: IgG (0.86 +/- 0.42 vs 0.59 +/- 0.12; p = .0109) and IgM (0.88 +/- 0.24 vs 0.61 +/- 0.14; p = .0001). IgM antilinear elastin antibodies (ALEAbs) in group 1 were significantly lower than in controls (0.462 +/- 0.191 vs 0.652 +/- 0.127; p = .0009). IgG alpha-AEAbs showed correlation with microalbuminuria (r = -.26; p = .05) and IgM ALEAbs correlated with microalbuminuria (r = -.32; p = .035). IgG alpha-AEAbs correlated with neuropathy (r = -.32; p = .035). Group 1 patients displayed a correlation between IgG ALEAbs and retinopathy (r = -.48; p = .023) and IgM ALEAbs and microalbuminuria (r = .52; p = .014). Levels of AEAbs and ALEAbs can serve as immunologic markers of the extent of elastin degradation. These markers may provide a tool to study elastin metabolism and a potential clinical role for AEAbs in the pathogenesis and development of vascular complications in diabetic children.
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