Publication date: Available online 8 May 2017
Source:Clinical Biochemistry
Author(s): Isaivani Jayachandran, Saravanakumar Sundararajan, Prabu Paramasivam, Balachandar Venkatesan, Shanthirani C. Subramanian, Muthuswamy Balasubramanyam, Viswanathan Mohan, Nagaraj Manickam
AimAsymmetric dimethylarginine (ADMA) is involved in the regulation of nitric oxide synthesis and in the maintenance of vascular tone and structure. But the role and status of ADMA in diabetes induced kidney injury is not clear. Hence this study is investigating the role of ADMA in the progression of kidney injury and its circulatory status in Asian Indians with and without diabetic nephropathy.MethodsRecruited study subjects were divided into normal glucose tolerance (NGT), type 2 diabetes mellitus (T2DM) and T2DM with micro or macroalbuminuria. Albuminuria was calculated using urinary albumin and creatinine ratio (UACR). ADMA was measured using ELISA. Kidney cell damage in terms of fibrotic markers and ADMA metabolism in terms of DDAH activity were investigated in kidney fibroblasts and mesangial cells.ResultsThere was a significant elevation in plasma ADMA levels in micro and macroalbuminuric diabetic patients. We found a significant positive correlation between ADMA and UACR, serum creatinine, HbA1C and fasting plasma glucose. A cut-off value of ADMA, 0.666μM/l had a sensitivity and specificity of 70.0% and 65.6%, respectively for detecting diabetic nephropathy. DDAH activity was significantly decreased and fibrotic markers such as fibronectin and α-SMA were significantly increased upon high glucose and ADMA treatment.ConclusionWe are suggesting a causative role of ADMA in the development of kidney injury in terms of renal fibrosis and also a cut point of 0.666μM/l of plasma ADMA level appears to be a predictive risk threshold for diabetic nephropathy in south Asian Indian population.
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