A Samadi1, A Gurlek2, S N Sendur2, S Karahan3, F Akbiyik1, I Lay4,5. 1. Department of Medical Biochemistry, Faculty of Medicine, Hacettepe University, Ankara, Turkey. 2. Department of Internal Medicine, Endocrinology Unit, Faculty of Medicine, Hacettepe University, Ankara, Turkey. 3. Department of Biostatistics, Faculty of Medicine, Hacettepe University, Ankara, Turkey. 4. Department of Medical Biochemistry, Faculty of Medicine, Hacettepe University, Ankara, Turkey. lincilay@gmail.com. 5. Clinical Pathology Laboratory, Hacettepe University Hospitals, 06100, Ankara, Turkey. lincilay@gmail.com.
Abstract
PURPOSE: To assess the plasma oxysterol species 7-ketocholesterol (7-Kchol) and cholestane-3β,5α,6β-triol (chol-triol) as biomarkers of oxidative stress in type 1 and type 2 diabetes mellitus (DM). METHODS: In total, 26 type 1 and 80 type 2 diabetes patients, along with 205 age- and gender-matched healthy controls, were included in this study. Oxysterols were quantified by liquid chromatography coupled with tandem mass spectrometry and N,N-dimethylglycine derivatization. Correlations between oxysterols and clinical/biochemical characteristics of the diabetes patients, and factors affecting 7-Kchol and chol-triol, were also determined. RESULTS: Plasma 7-Kchol and chol-triol levels were significantly higher in type 1 and type 2 diabetes patients compared to healthy controls (P < 0.001). Significant positive correlations were observed between oxysterol levels and levels of glycated hemoglobin (HbA1c), glucose, serum total cholesterol, low-density lipoprotein, very-low-density lipoprotein, and triglycerides, as well as the number of coronary risk factors. Statins, oral hypoglycemic agents, and antihypertensive agents reduced the levels of oxysterols in type 2 diabetes patients. Statin use, HbA1c levels, and the number of coronary risk factors accounted for 98.8% of the changes in 7-Kchol levels, and total cholesterol, smoking status, and the number of coronary risk factors accounted for 77.3% of the changes in chol-triol levels in type 2 diabetes patients. CONCLUSIONS: Plasma oxysterol levels in DM, and particularly type 2 DM, may yield complementary information regarding oxidative stress for the clinical follow-up of diabetes patients, especially those with coronary risk factors.
PURPOSE: To assess the plasma oxysterol species 7-ketocholesterol (7-Kchol) and cholestane-3β,5α,6β-triol (chol-triol) as biomarkers of oxidative stress in type 1 and type 2 diabetes mellitus (DM). METHODS: In total, 26 type 1 and 80 type 2 diabetespatients, along with 205 age- and gender-matched healthy controls, were included in this study. Oxysterols were quantified by liquid chromatography coupled with tandem mass spectrometry and N,N-dimethylglycine derivatization. Correlations between oxysterols and clinical/biochemical characteristics of the diabetespatients, and factors affecting 7-Kchol and chol-triol, were also determined. RESULTS: Plasma 7-Kchol and chol-triol levels were significantly higher in type 1 and type 2 diabetespatients compared to healthy controls (P < 0.001). Significant positive correlations were observed between oxysterol levels and levels of glycated hemoglobin (HbA1c), glucose, serum total cholesterol, low-density lipoprotein, very-low-density lipoprotein, and triglycerides, as well as the number of coronary risk factors. Statins, oral hypoglycemic agents, and antihypertensive agents reduced the levels of oxysterols in type 2 diabetespatients. Statin use, HbA1c levels, and the number of coronary risk factors accounted for 98.8% of the changes in 7-Kchol levels, and total cholesterol, smoking status, and the number of coronary risk factors accounted for 77.3% of the changes in chol-triol levels in type 2 diabetespatients. CONCLUSIONS: Plasma oxysterol levels in DM, and particularly type 2 DM, may yield complementary information regarding oxidative stress for the clinical follow-up of diabetespatients, especially those with coronary risk factors.
Entities:
Keywords:
Diabetes mellitus; LC–MS/MS; Oxidative stress; Oxysterols; Tandem mass spectrometry
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