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    Effect of alcohol on lipid levels in the brains of rats
    (2008) Kurban S.; Mehmetoglu I.
    Purpose: To investigate the effects of alcohol consumption on rat brain cholesterol, triglyceride, and phospholipids levels. Materials and methods: The study was performed on 24 Sprague-Dawley rats of which 12 were selected as the control group and 12 as the alcohol group. Both groups were fed regular laboratory chow. In addition, the alcohol group rats were fed 15% (v/v) of ethanol in their drinking water for 2 months. Then, the rats were decapitated under ketamine anesthesia and the brain tissues were removed and homogenized in ice-cold 0.1 M phosphate buffer containing 1% digitonin. The tissues were centrifuged and brain cholesterol, triglyceride, and phospholipid levels of supernatants were measured using commercially available enzymatic kits. Results: Brain cholesterol, triglyceride, and phospholipid levels of the alcohol group were 29.36 ± 1.68, 39.81 ± 8.5, and 2.91 ± 0.82, respectively, whereas the same parameters of the control group were 22.58 ± 2.29, 32.57 ± 3.7, and 2.47 ± 0.64 mg/g protein, respectively. Brain cholesterol (p<0.001) and triglyceride (p<0.05) levels differed significantly between the groups whereas phospholipid levels did not. Conclusion: The effects of alcohol on brain cholesterol and triglyceride levels may result in significant disturbances in brain functions. The underlying mechanism of this finding is not known and needs to be investigated further.
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    The relationship between the antioxidant system, oxidative stress and dialysis-related amyloidosis in hemodialysis patients.
    (2013) Celik G.; Capraz I.; Yontem M.; Bilge M.; Unaldi M.; Mehmetoglu I.
    End-stage renal disease (ESRD) is associated with several complications that are partly due to excess amounts of reactive oxygen species and/or decreased antioxidant activity. Dialysis-related amyloidosis (DRA) has also been linked to increased oxidative stress. The aim of this study was to investigate the relationships between the antioxidant system, including superoxide dismutase (SOD), malonyldialdehyde (MDA), various biochemical parameters and shoulder amyloidosis, in hemodialysis patients. We studied 107 non-diabetic chronic dialysis patients. The SOD levels correlated with right and left biceps tendon thickness (r = -0.219, P = 0.048 and r = -0.236, P = 0.031, respectively), MDA (r = -0.429, P = 0.000) and albumin levels (r = -0.319, P = 0.001). MDA levels correlated with right and left biceps thickness (r = 0.291, P = 0.006 and r = 0.337, P = 0.001, respectively) and ?2 microglobulin levels (r = 0.455, P = 0.000). We also identified the statistically significant relationships between MDA levels and supraspinatus tendon thickening (greater than 7 mm) and right and left biceps tendon thickness (P = 0.022, P = 0.040 and P = 0.005, respectively). Our data suggest the complex relationship between antioxidants and oxidative stress and further support the roles of oxidative stress and antioxidants in DRA.