Open AccessOxidative damage to DNA and lipids: correlation with protein glycation in patients with type 1 diabetes
Author(s) -
Goodarzi Mohammad Taghi,
Navidi Ali Akbar,
Rezaei Mohsen,
BabahmadiRezaei Hossein
Publication year - 2010
Publication title -
journal of clinical laboratory analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 50
eISSN - 1098-2825
pISSN - 0887-8013
DOI - 10.1002/jcla.20328
Subject(s) - glycation , glycated hemoglobin , lipid peroxidation , medicine , oxidative stress , diabetes mellitus , malondialdehyde , endocrinology , type 2 diabetes , dna damage , glycemic , urinary system , chemistry , reactive oxygen species , oxidative phosphorylation , blood sugar , biochemistry , dna
Diabetic hyperglycemia is associated with increased production of reactive oxygen species (ROS). ROS reacts with DNA resulting in various products, such as 8‐hydroxydeoxyguanosine (8‐OHdG), that excrete in urine owing to DNA repair processes. Urinary 8‐OHdG has been proposed as an indicator of oxidative damage to DNA. This study aimed to evaluate relationship between oxidative damage to DNA and protein glycation in patients with Type 1 diabetes. We measured urinary 8‐OHdG level in diabetic patients and healthy subjects and discussed its relationship to glycated hemoglobin (HbA 1c ) and glycated serum protein (GSP) levels. Furthermore plasma malondialdehyde (MDA) level monitored as an important indicator of lipid peroxidation in diabetes. We studied 32 patients with Type 1 diabetes mellitus and compared the measured factors with those of 48 age‐matched nondiabetic controls. GSP and MDA were measured bycolorimetric assay. Urinary 8‐OHdG measurement was carried out using ELISA. In this study urinary 8‐OHdG, HbA 1c , plasma MDA, and GSP levels were progressively higher in diabetics than in control subjects ( P <0.05). Furthermore we found significant correlation between urinary 8‐OHdG and HbA 1c ( P <0.05) in diabetic group. Correlation between fasting blood sugar and GSP were significant. We also found significant correlation between fasting blood sugar and MDA. This case–control study in young diabetic patients showed increased blood glucose and related metabolic disorders result in oxidative stress and oxidative damage to DNA and lipids. Furthermore oxidative damage to DNA is associated to glycemic control level, whereas lipid peroxidation level was not significantly correlated with glycemic control level. J. Clin. Lab. Anal. 24:72–76, 2010. © 2010 Wiley‐Liss, Inc.