Peripheral blood mitochondrial DNA copy number as a novel potential biomarker for diabetic nephropathy in type 2 diabetes patients

Al‑Kafaji,Ghada; Aljadaan,Abdulah; Kamal,Amer; Bakhiet,Moiz

doi:10.3892/etm.2018.6319

August-2018 Volume 16 Issue 2

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August-2018 Volume 16 Issue 2

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Article

Peripheral blood mitochondrial DNA copy number as a novel potential biomarker for diabetic nephropathy in type 2 diabetes patients

Authors:
- Ghada Al‑Kafaji
- Abdulah Aljadaan
- Amer Kamal
- Moiz Bakhiet
View Affiliations / Copyright

Affiliations: Department of Molecular Medicine and Al‑Jawhara Centre for Molecular Medicine, Genetics and Inherited Disorders, College of Medicine and Medical Sciences, Arabian Gulf University, Manama 329, Kingdom of Bahrain, Department of Physiology, College of Medicine and Medical Sciences, Arabian Gulf University, Manama 329, Kingdom of Bahrain
Pages: 1483-1492
|
Published online on: June 15, 2018

https://doi.org/10.3892/etm.2018.6319
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Abstract

The mitochondrial DNA copy number (mtDNA‑CN) is a surrogate measure of mitochondrial function and altered mtDNA‑CN reflects the oxidant‑induced cell damage. A previous study by our group demonstrated that a reduction in the renal mtDNA‑CN is implicated in the pathogenesis of diabetic nephropathy (DN), a leading cause of end‑stage renal disease in diabetic patients. In the present study, it was investigated whether the mtDNA‑CN in the peripheral blood may be utilized as a biomarker for DN in type 2 diabetes (T2D) patients. The study included 50 non‑diabetic and 100 diabetic subjects. The diabetic subjects were sub‑divided based on their albumin‑to‑creatinine ratio (ACR) into T2D patients with normoalbuminuria (n=50), DN patients with microalbuminuria (n=29) and DN patients with macroalbuminuria (n=21). The mtDNA‑CN was measured in the peripheral blood by real‑time polymerase chain reaction analysis. Patients with DN had a lower mtDNA‑CN than patients with T2D and healthy controls (P<0.05). A sub‑group analysis with stratification by the ACR indicated that a decreased mtDNA‑CN was associated with the severity and the presence of DN, as it was lower in DN patients with macroalbuminuria than in DN patients with microalbuminuria and T2D patients with normoalbuminuria (P<0.01). The area under the receiver operating characteristic curve (AUC) for mtDNA‑CN was 0.916 (sensitivity, 86% and specificity, 74%) and 0.961 (sensitivity, 96% and specificity, 88%) for differentiating DN patients from T2D patients without DN and from healthy controls, respectively. Furthermore, the AUC of mtDNA‑CN for differentiating DN patients with microalbuminuria from those with macroalbuminuria was 0.895 (sensitivity, 83% and specificity, 85%). Multivariate analysis revealed that the mtDNA‑CN was significantly associated with the occurrence and progression of DN, even after adjustment for age, mean blood pressure, glycated haemoglobin A1c and total cholesterol (P<0.05). In patients with DN, a decreased mtDNA‑CN was negatively correlated with albuminuria and conventional risk factors for DN, and was positively correlated with the estimated glomerular filtration rate. The present results therefore suggest the utilization of circulating mtDNA‑CN as a novel biomarker for the early diagnosis of DN and indicate the significance of decreased mtDNA‑CN as another independent risk factor for DN.

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