Free radicals-induced changes in mesenteric microvascular dimensions in the anesthetized cat.
نویسندگان
چکیده
Effect of free radicals on microvascular dimensions was studied in anesthetized cat intestinal mesentery. Generation of free radicals by xanthine oxidase, acting on endogenous substrates (e.g., xanthine, hypoxanthine), produced sustained vasodilation at pH 7.4 or at pH 6.6. These effects were reversed by superoxide dismutase (SOD), a superoxide radical (.O2-) scavenger, at pH 7.4, and by SOD plus hydroxyl radical (.OH) scavenger d-mannitol at pH 6.6. These findings suggest that the sustained vasodilation is caused by .O2- and by .OH derived from .O2- at low pH.
منابع مشابه
بررسی پاسخ سیستم دفاعی آنتی‌اکسیدان طحال و اریتروسیت‌ها به اثرات-N استیل سیستئین در کاهش سمیت پاراکسون در موش صحرایی
Background & Aims : Paraoxon (POX) as an organophosphate pesticide is the active form of parathion that is widely used in agriculture. Antioxidants can protect cells from oxidative stress. The aim of this study was to investigate the effect of NAC as a n antioxidant against POX- induced oxidative stress in rat spleen and erythrocytes. Material & Methods : In the present experimental study...
متن کاملP-67: Nano-Selenium Protects Cisplatin-Induced Spermatotoxicty and Chromatin Abnormality Associated with Free Radicals Toxic Stress
Background: Cisplatin (CIS), an anticancer alkylating agent, induces DNA adducts and effectively cross links the DNA strands and so affects spermatozoa as a male reproductive tract toxicant. Materials and Methods: The present study investigated the cellular/biochemical mechanisms underlying possible protective effect of selenium nano-particles (Nano-Se) as an established strong antioxidant with...
متن کاملبررسی تاثیر داروی ان- استیل سیستئین بر کاهش استرس اکسیداتیو ناشی از پاراکسون در بافت‌های مغز و قلب
Introduction: Organophosphate (OP) pesticide is used as chemical warfare nerve agents against both military and civilian population during the Iran–Iraq War. Paraoxon (POX) as an OP acts via the inhibition of cholinesterase and disturbance in body antioxidant systems. The aim of this study was to investigate the effect of N-acetyl cysteine (NAC) as an antioxidant against POX- induced oxid...
متن کاملChronic ethanol consumption exacerbates microcirculatory damage in rat mesentery after reperfusion.
Although the negative effect of excessive alcohol consumption on later stressful events has long been recognized, pathophysiological mechanisms are incompletely understood. We examined possible roles of oxygen radicals and glutathione content in mesenteric venules of chronically ethanol-fed rats exposed to ischemia-reperfusion. Changes in microvascular hemodynamics, such as red blood cell (RBC)...
متن کاملCARDIOVASCULAR RESPONSES TO HYPERCAPNIA AND VARYING LEVELS OF ARTERIAL pH IN THE ANESTHETIZED CAT
Effects of acute hypercapnia on the cardiovascular system (CYS) were studied in the anesthetized cat. After surgery the animal was exposed to a gas mixture of 12% CO2 and 25% O2 in nitrogen, and hypercapnia with low levels of arterial pH (pHa) was produced for 20 minutes. In the second run the same level of hypercapnia was induced by ventilating the same cat from the above gas mixture but ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Japanese journal of pharmacology
دوره 33 6 شماره
صفحات -
تاریخ انتشار 1983