Mechanisms of increased vascular superoxide production in human varicose veins

Guzik, B. et al. (2011) Mechanisms of increased vascular superoxide production in human varicose veins. Polish Archives of Internal Medicine, 121(9), pp. 279-286. (PMID:0032-3772)

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INTRODUCTION Varicose vein disease is one of the most common morbidities in the developed countries. Recent studies have shown that oxidative stress is increased in varicose veins (VV) and venous insufficiency. However, the exact mechanisms of oxidative stress in VV remain unknown. OBJECTIVES The aim of the study was to measure superoxide anion production and analyze its enzymatic sources in VV in comparison with control human saphenous veins (HSV). Superoxide production was also compared between the proximal and distal segments of the veins. PATIENTS AND METHODS Proximal and distal segments of varicose veins (14 patients, aged 52 ±3.5 years) and control veins (15 patients, aged 56 ±4 years) were obtained during VV removal or elective coronary artery bypass graft surgery, respectively. Subjects were matched for age, sex, and the major risk factors for atherosclerosis. Superoxide was measured by lucigenin-enhanced chemiluminescence (5 μmol/l) in the presence and absence of oxidase inhibitors. RESULTS Superoxide production was increased in VV compared with control HSV. This increase was particularly evident in the distal segments of VV. There was a significant correlation between superoxide production in the proximal and distal segments of HSV but not of VV. Nicotinamide adenine dinucleotide phosphate (NADPH) oxidases and uncoupled nitric oxide synthase (NOS) were the major sources of superoxide in VV, because their inhibitors greatly attenuated superoxide production in VV. CONCLUSIONS NADPH oxidases and NOS could represent valuable drug targets for pharmacological treatment and prevention of varicose vein disease. Oxidative stress may provide a link between endothelial dysfunction, inflammation, and immune activation and the development of chronic venous dysfunction.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Guzik, Professor Tomasz and Guzik, Dr Bartlomiej
Authors: Guzik, B., Chwała, M., Matusik, P., Ludew, D., Skiba, D., Wilk, G., Mrowiecki, W., Batko, B., Cencora, A., Kapelak, B., Sadowski, J., Korbut, R., and Guzik, T. J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:Polish Archives of Internal Medicine
Publisher:Medycyna Praktyczna
ISSN (Online):1897-9483

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