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  • Title: Increased urinary angiotensinogen precedes the onset of albuminuria in normotensive type 2 diabetic patients.
    Author: Zhuang Z, Bai Q, A L, Liang Y, Zheng D, Wang Y.
    Journal: Int J Clin Exp Pathol; 2015; 8(9):11464-9. PubMed ID: 26617876.
    Abstract:
    It was previously reported that intrarenal renin angiotensin system (RAS) plays a pivotal role in the onset and progression of diabetic nephropathy (DN). Urinary angiotensinogen (UAGT) was employed as a special index of the intrarenal RAS status and enhanced significantly at a very early stage of chronic kidney disease and type 1 diabetes. On the basis of these findings, the present study was performed to test the hypothesis that UAGT levels are increase even before the development of DN in type 2 diabetic patients without hypertension. 102 patients with type 2 diabetes mellitus (T2DM) and 18 healthy volunteers were studied cross-sectionally. Clinical data were collected and morning spot urine samples were obtained from all participants. UAGT levels were detected by an enzyme-linked immunosorbent assay (ELISA). As a result, UAGT to creatinine ratio (UAGT/Cr) was significantly enhanced in T2DM patients before the appearance of urinary albumin (UALB) and further increased to a greater degree in albuminuric patients. UAGT/Cr levels were positively correlated with Log (UALB to creatinine ratio) and diastolic blood pressure, but negatively correlated with estimated glomerular filtration rate. These data indicate that elevated UAGT levels precede the onset of albuminuria in normotensive T2DM patients. UAGT might potentially serve as an early marker to determine intrarenal RAS activity and predict progressive kidney disease in T2DM patients without hypertension.
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