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  • Title: Serum sialic acid and the long-term complications of insulin-dependent diabetes mellitus.
    Author: Powrie JK, Watts GF, Crook MA, Ingham JN, Taub NA, Shaw KM.
    Journal: Diabet Med; 1996 Mar; 13(3):238-42. PubMed ID: 8689844.
    Abstract:
    Elevated serum sialic acid (SSA) predicts cardiovascular disease in the non-diabetic population and is also associated with the presence of microalbuminuria and clinical proteinuria in patients with insulin-dependent diabetes (IDDM). We have studied 121 patients with IDDM of long duration (mean duration 25.2 years) to investigate the relationship of SSA concentrations to the presence of retinopathy, nephropathy, and neuropathy. SSA levels were elevated in patients with retinopathy (0.578 +/- 0.161 gl-1, n = 98) when compared with those without retinopathy (0.468 +/- 0.145 gl-1, n = 23, p = 0.002). Patients with nephropathy (urinary albumin:creatinine ratio of > 3 mg mmol-1 in all of three early morning specimens of urine) also had raised SSA levels (0.625 +/- 0.169 gl-1, n = 30) compared with those without nephropathy (0.533 +/- 0.160 gl-1, n = 91, p = 0.006). There was a significant correlation of SSA with urinary albumin:creatinine ratio (correlation coefficient 0.33, p < 0.001). SSA levels were not related to the presence or absence of neuropathy (0.567 +/- 0.181 gl-1, n = 28, vs 0.533 +/- 0.160 gl-1, n = 93, p = 0.92, respectively). In conclusion, retinopathy and nephropathy but not neuropathy are associated with increased SSA levels in patients with IDDM. The significance of this is not yet clear but it is possible that sialic acid is involved in the pathophysiology of microvascular disease in IDDM.
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