Ufuk Cakatay1, Refik Kayali. 1. Istanbul University, Istanbul Faculty of Medicine, Central Laboratory of Biochemistry, Capa, 34390 Istanbul, Turkey. cakatay@yahoo.com <cakatay@yahoo.com>
Abstract
OBJECTIVES: An increase in plasma oxidative stress and decreased mitochondrial lipid hydroperoxides may contribute to the imbalance in the redox status between intramitochondrial and extramitochondrial milieu in chronic experimental diabetic rats. DESIGN AND METHODS: To determine the effect of hyperglycemia in promoting redox imbalance, we determined lipid hydroperoxides (LHP), protein carbonyl (PCO), total antioxidant activity (ferric reducing/antioxidant power; FRAP) and albumin as markers of redox status of plasma, and mitochondrial lipid hydroperoxide levels as a marker of lipid peroxidation in liver, pancreas and kidney tissue of acute and chronic diabetic male Sprague-Dawley rats and their controls. The levels of the studied markers were determined by colorimetric methods. RESULTS: Plasma and mitochondrial oxidative stress parameter levels of acute diabetic rats were not significantly different from their controls. Plasma LHP and PCO levels of chronic diabetic rats were increased significantly as compared to those of both acute diabetic rats and the controls. Plasma FRAP levels of chronic diabetic animals were decreased significantly as compared to those of the controls. On the other hand, LHP levels in liver, pancreas and kidney mitochondria of chronic diabetic rats were decreased significantly as compared to those of both acute diabetic rats and the controls. We observed a negative correlation between LHP levels in liver mitochondria of chronic diabetic rats, and PCO and fructosamine levels in plasma of chronic diabetic rats were correlated. LHP levels in the pancreatic mitochondria of chronic diabetic rats and plasma oxidative stress parameters of chronic diabetic rats were not significantly correlated. LHP levels in kidney mitochondria of chronic diabetic rats were significantly correlated with serum albumin. There was no correlation between LHP levels in kidney mitochondria and other plasma oxidative stress parameters in chronic diabetic rats. CONCLUSIONS: Our data suggest that redox imbalance between plasma and liver mitochondria might become a major threat to chronic diabetic rats.
OBJECTIVES: An increase in plasma oxidative stress and decreased mitochondrial lipid hydroperoxides may contribute to the imbalance in the redox status between intramitochondrial and extramitochondrial milieu in chronic experimental diabeticrats. DESIGN AND METHODS: To determine the effect of hyperglycemia in promoting redox imbalance, we determined lipid hydroperoxides (LHP), protein carbonyl (PCO), total antioxidant activity (ferric reducing/antioxidant power; FRAP) and albumin as markers of redox status of plasma, and mitochondrial lipid hydroperoxide levels as a marker of lipid peroxidation in liver, pancreas and kidney tissue of acute and chronic diabetic male Sprague-Dawley rats and their controls. The levels of the studied markers were determined by colorimetric methods. RESULTS: Plasma and mitochondrial oxidative stress parameter levels of acute diabeticrats were not significantly different from their controls. Plasma LHP and PCO levels of chronic diabeticrats were increased significantly as compared to those of both acute diabeticrats and the controls. Plasma FRAP levels of chronic diabetic animals were decreased significantly as compared to those of the controls. On the other hand, LHP levels in liver, pancreas and kidney mitochondria of chronic diabeticrats were decreased significantly as compared to those of both acute diabeticrats and the controls. We observed a negative correlation between LHP levels in liver mitochondria of chronic diabeticrats, and PCO and fructosamine levels in plasma of chronic diabeticrats were correlated. LHP levels in the pancreatic mitochondria of chronic diabeticrats and plasma oxidative stress parameters of chronic diabeticrats were not significantly correlated. LHP levels in kidney mitochondria of chronic diabeticrats were significantly correlated with serum albumin. There was no correlation between LHP levels in kidney mitochondria and other plasma oxidative stress parameters in chronic diabeticrats. CONCLUSIONS: Our data suggest that redox imbalance between plasma and liver mitochondria might become a major threat to chronic diabeticrats.
Authors: M Knaś; M Maciejczyk; I Daniszewska; A Klimiuk; J Matczuk; U Kołodziej; D Waszkiel; J R Ładny; M Żendzian-Piotrowska; A Zalewska Journal: J Diabetes Res Date: 2016-07-13 Impact factor: 4.011
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