1. Urinary heparanase activity in patients with Type 1 and Type 2 diabetes.
- Author
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Rops AL, van den Hoven MJ, Veldman BA, Salemink S, Vervoort G, Elving LD, Aten J, Wetzels JF, van der Vlag J, and Berden JH
- Subjects
- Adult, Aged, Albuminuria diagnosis, Blotting, Western, Case-Control Studies, Diabetes Complications enzymology, Diabetes Complications etiology, Diabetes Complications urine, Female, Follow-Up Studies, Glucuronidase genetics, Humans, Immunoenzyme Techniques, Male, Middle Aged, Prognosis, RNA, Messenger genetics, Real-Time Polymerase Chain Reaction, Renin-Angiotensin System, Reverse Transcriptase Polymerase Chain Reaction, Diabetes Mellitus, Type 1 enzymology, Diabetes Mellitus, Type 1 urine, Diabetes Mellitus, Type 2 enzymology, Diabetes Mellitus, Type 2 urine, Glomerular Basement Membrane pathology, Glucuronidase urine, Heparitin Sulfate metabolism
- Abstract
Background: A reduced heparan sulphate (HS) expression in the glomerular basement membrane of patients with overt diabetic nephropathy is associated with an increased glomerular heparanase expression. We investigated the possible association of urinary heparanase activity with the development of proteinuria in patients with Type 1 diabetes (T1D), Type 2 diabetes (T2D), or membranous glomerulopathy (MGP) as non-diabetic disease controls., Methods: Heparanase activity, albumin, HS and creatinine were measured in the urine of patients with T1D (n=58) or T2D (n=31), in patients with MGP (n=52) and in healthy controls (n=10). Heparanase messenger RNA (mRNA) expression in leukocytes was determined in a subgroup of patients with T1D (n=19)., Results: Urinary heparanase activity was increased in patients with T1D and T2D, which was more prominent in patients with macroalbuminuria, whereas no activity could be detected in healthy controls. Albuminuria levels were associated with increased urinary heparanase activity in diabetic patients (r=0.20; P<0.05) but not in patients with MGP (r=0.11; P=0.43). A lower urinary heparanase activity was observed in diabetic patients treated with inhibitors of the renin-angiotensin-aldosterone system (RAAS), when compared to diabetic patients treated with other anti-hypertensives. Additionally, urinary heparanase activity was associated with age in T1D and MGP. In MGP, heparanase activity and β2-microglobulin excretion correlated. In patients with T1D, no differences in heparanase mRNA expression in leukocytes could be observed., Conclusions: Urinary heparanase activity is increased in diabetic patients with proteinuria. However, whether increased heparanase activity is a cause or consequence of proteinuria requires additional research.
- Published
- 2012
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