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High glucose mediates prooxidant and antioxidant enzyme activities in coronary endothelial cells

Bayraktutan, Ulvi; Weidig, Pamela; McMaster, Dorothy; Ulker, Sibel

Authors

Ulvi Bayraktutan

Pamela Weidig

Dorothy McMaster

Sibel Ulker



Abstract

Objective: Excess levels of free radicals such as nitric oxide (NO) and superoxide anion (O2-)are associated with the pathogenesis of endothelial cell dysfunction in diabetes mellitus. This study was designed to investigate the underlying causes of oxidative stress in coronary microvascular endothelial cells (CMEC) exposed to hyperglycaemia.

Methods: CMEC were cultured under normal (5.5 mmol/L) or high glucose (22 mmol/L)concentrations for 7 days. The activity and expression (protein level) of eNOS, iNOS, NAD(P)H oxidase and antioxidant enzymes, namely, superoxide dismutase (SOD), catalase and glutahione peroxidase (GPx) were investigated by specific activity assays and Western analyses,respectively while the effects of hyperglycaemia on nitrite and O2 - generation were investigated
by Griess reaction and cytochrome C reduction assay, respectively.

Results: Hyperglycaemia did not alter eNOS or iNOS protein expressions and overall nitrite generation, an index of NO production. However, it significantly reduced the levels of intracellular antioxidant glutathione by 50% (p

Journal Article Type Article
Publication Date Jan 1, 2004
Journal Diabetes Obesity and metabolism
Peer Reviewed Not Peer Reviewed
Volume 6
APA6 Citation Bayraktutan, U., Weidig, P., McMaster, D., & Ulker, S. (2004). High glucose mediates prooxidant and antioxidant enzyme activities in coronary endothelial cells
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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