Abstract
Purpose
Adiponectin may be beneficial in incipient chronic kidney disease by antagonizing oxidative stress. We evaluated adiponectin, malondialdehyde (MDA), and superoxide dismutase (SOD), in type 2 diabetes mellitus patients (T2DP) with and without incipient nephropathy.
Methods
T2DP with glomerular filtration rate (GFR) >30 ml/min were compared with 20 healthy controls. Clinical and laboratory evaluations, levels of MDA (fluorimetric thiobarbituric test), SOD (cytochrome reduction method) and adiponectin (ELISA) were obtained.
Results
Sixty-four patients (GFR 91.44 ± 38.50 ml/min, urinary albumin-to-creatinine ratio [UACR] 20.81 [4.64–72.88 mg/g]) were included. MDA was higher in T2DP than in controls: 3.97 (2.43–4.59) versus 1.35 (1.16–1.81) nmol/ml, p < 0.0001. MDA correlated with glycated hemoglobin (r = 0.40, p = 0.001), adiponectin (r = −0.28, p = 0.03), systolic blood pressure (r = −0.28, p = 0.03) and SOD (r = −0.35, p = 0.005); adiponectin (p = 0.01) and glycated hemoglobin (p = 0.02) remained significant predictors of MDA in multiple regression analysis. SOD was negatively correlated with glycemia (r = −0.71, p < 0.0001) and glycated hemoglobin (r = −0.5, p < 0.0001). When patients were divided according to a ROC-derived adiponectin cutoff of 8.9 µg/ml, patients with higher adiponectin had lower MDA, [2.55 (2.35–3.60) vs. 4.10 (2.89–5.31) nmol/ml, p = 0.005] but similar SOD levels. In T2DP with nephropathy (GFR < 60 ml/min or UACR > 30 mg/g), the correlation of adiponectin with MDA was stronger, (r = −0.51, p = 0.004) confirmed in multiple regression analysis (p = 0.03). Adiponectin was not correlated with MDA, and SOD was inversely related to MDA in patients without nephropathy.
Conclusion
Adiponectin is a significant predictor of MDA in early diabetic nephropathy, whereas SOD strongly depends only on glycemic control and is not directly related to adiponectin.
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Acknowledgments
This study was funded by a Grant, CNCSIS- Capacitati – Modul III 750/2014. Cosmina-Ioana Bondor is a fellow of POSDRU Grant No. 159/1.5/S/138776, grant with title: “Model colaborativ institutional pentru translatarea cercetarii stiintifice biomedicale in practica clinica – TRANSCENT.”
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Ethical standard
All procedures performed in this study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Bondor, C.I., Potra, A.R., Moldovan, D. et al. Relationship of adiponectin to markers of oxidative stress in type 2 diabetic patients: influence of incipient diabetes-associated kidney disease. Int Urol Nephrol 47, 1173–1180 (2015). https://doi.org/10.1007/s11255-015-1004-2
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DOI: https://doi.org/10.1007/s11255-015-1004-2