کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8270961 | 1534979 | 2013 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Endothelial NO and O2â production rates differentially regulate oxidative, nitroxidative, and nitrosative stress in the microcirculation
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کلمات کلیدی
Endothelial dysfunction - اختلال عملکرد اندوتلیالBiotransport - بیوت حمل و نقلFree radicals - رادیکال آزادMicrocirculation - ریز جریانSuperoxide - سوپر اکسیدSuperoxide dismutase - سوکسوکس دیسموتازFlux - شار یا شاریدگیComputational model - مدل محاسباتیProduction rate - نرخ تولیدPeroxynitrite - پروکسی نیتریت
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
سالمندی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Endothelial dysfunction causes an imbalance in endothelial NO and O2â production rates and increased peroxynitrite formation. Peroxynitrite and its decomposition products cause multiple deleterious effects including tyrosine nitration of proteins, superoxide dismutase (SOD) inactivation, and tissue damage. Studies have shown that peroxynitrite formation during endothelial dysfunction is strongly dependent on the NO and O2â production rates. Previous experimental and modeling studies examining the role of NO and O2â production imbalance on peroxynitrite formation showed different results in biological and synthetic systems. However, there is a lack of quantitative information about the formation and biological relevance of peroxynitrite under oxidative, nitroxidative, and nitrosative stress conditions in the microcirculation. We developed a computational biotransport model to examine the role of endothelial NO and O2â production on the complex biochemical NO and O2â interactions in the microcirculation. We also modeled the effect of variability in SOD expression and activity during oxidative stress. The results showed that peroxynitrite concentration increased with increase in either O2â to NO or NO to O2â production rate ratio (QO2â/QNO or QNO/QO2â, respectively). The peroxynitrite concentrations were similar for both production rate ratios, indicating that peroxynitrite-related nitroxidative and nitrosative stresses may be similar in endothelial dysfunction or inducible NO synthase (iNOS)-induced NO production. The endothelial peroxynitrite concentration increased with increase in both QO2â/QNO and QNO/QO2â ratios at SOD concentrations of 0.1-100 μM. The absence of SOD may not mitigate the extent of peroxynitrite-mediated toxicity, as we predicted an insignificant increase in peroxynitrite levels beyond QO2â/QNO and QNO/QO2â ratios of 1. The results support the experimental observations of biological systems and show that peroxynitrite formation increases with increase in either NO or O2â production, and excess NO production from iNOS or from NO donors during oxidative stress conditions does not reduce the extent of peroxynitrite mediated toxicity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Free Radical Biology and Medicine - Volume 63, October 2013, Pages 161-174
Journal: Free Radical Biology and Medicine - Volume 63, October 2013, Pages 161-174
نویسندگان
Saptarshi Kar, Mahendra Kavdia,