Annals of African Medicine
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Year : 2014  |  Volume : 13  |  Issue : 1  |  Page : 41-46

Oxidative stress in diabetic patients with retinopathy

1 Department of Biochemistry, Medical College, Kolkata, West Bengal, India
2 Department of Physiology, Medical College, Kolkata, West Bengal, India
3 Department of Pathology, Medical College, Kolkata, West Bengal, India

Correspondence Address:
Dipankar Kundu
Medical College, Kolkata - 700 037, West Bengal
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/1596-3519.126951

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Background: Diabetes mellitus (DM) is known to induce oxidative stress along with deranging various metabolisms; one of the late complications of diabetes mellitus is diabetic retinopathy, which is a leading cause of acquired blindness. Poor glycemic control and oxidative stress have been attributed to the development of complications like diabetic retinopathy. The aim of this study was to analyze and correlate oxidative stress marker, Malondialdehyde (MDA), and antioxidants (erythrocyte glutathione, vitamin C) along with glycosylated hemoglobin (HbA 1c ) and fasting blood sugar (FBS) in diabetic patients with and without retinopathy. Materials and Methods: The study population comprised of 50 type 2 diabetics with retinopathy as Group 1 (G1) and 50 type 2 diabetics without retinopathy as Group 2 (G2) in the age group 40-70 years as patients, and 50 age- and gender-matched healthy individuals as controls, Group 3 (G3). FBS, HbA 1c MDA, glutathione in erythrocytes, and vitamin C were assayed. Results were analyzed using SPSS 11.0, Mann-Whitney U-test, and Pearson correlation coefficient. Results: Mean FBS (mg/dl) were 194.04 ± 48.52 (G1), 181.24 ± 50.05 (G2), and 92.20 ± 9.19 (G3) (P < 0.001). Mean values of MDA were 6.65 ± 0.30 (G1), 4.63 ± 0.56 (G2), and 3.90 ± 0.34 (G3) (P < 0.001). The mean reduced glutathione (GSH) levels were (mg/g of Hb) 6.10 ± 1.41 (G1), 6.44 ± 1.53 (G2), and 13.09 ± 2.49 (G3) (P < 0.001). The mean vitamin C levels (mg/dl) were 0.70 ± 0.24 (G1), 0.87 ± 0.29 (G2), and 1.25 ± 0.27 (G3) (P < 0.001). Conclusion: Estimation of HbA 1c , MDA, GSH in erythrocytes, and vitamin C levels can contribute to determine the extent of oxidative stress in diabetes and help in effective control and prevention of the onset and progression of diabetic retinopathy.

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