Association of blood arsenic levels with increased reactive oxidants and decreased antioxidant capacity in a human population of northeastern Taiwan.
نویسندگان
چکیده
Arsenic is a notorious environmental toxicant known as both a carcinogen and an atherogen in human beings, but the pathogenic mechanisms are not completely understood. In cell culture studies, trivalent arsenic enhanced oxidative stress in a variety of mammalian cells, and this association may be closely associated with the development of arsenic-related diseases. To investigate the effect of arsenic exposure on oxidative stress in humans, we conducted a population study to determine the relationships of blood arsenic to reactive oxidants and antioxidant capacity at the individual level. We recruited 64 study subjects ages 42-75 years from residents of the Lanyang Basin on the northeast coast of Taiwan, where arsenic content in well water varies from 0 to > or = 3,000 microg/L. We used a chemiluminescence method, with lucigenin as an amplifier for measuring superoxide, to measure the plasma level of reactive oxidants. We used the azino-diethyl-benzthiazoline sulphate method to determine the antioxidant capacity level in plasma of each study subject. We determined arsenic concentration in whole blood by hydride formation with an atomic absorption spectrophotometer. The average arsenic concentration in whole blood of study subjects was 9.60 +/- 9.96 microg/L (+/- SD) with a range from 0 to 46.50 microg/L. The level of arsenic concentration in whole blood of study subjects showed a positive association with the level of reactive oxidants in plasma (r = +0.41, p = 0.001) and an inverse relationship with the level of plasma antioxidant capacity (r = -0.30, p = 0.014). However, we found no significant association (p = 0.266) between levels of plasma reactive oxidants and antioxidant capacity. Our results also show that the lower the primary arsenic methylation capability, the lower the level of plasma antioxidant capacity (p = 0.029). These results suggest that ingestion of arsenic-contaminated well water may cause deleterious effects by increasing the level of reactive oxidants and decreasing the level of antioxidant capacity in plasma of individuals. Persistent oxidative stress in peripheral blood may be a mechanism underlying the carcinogenesis and atherosclerosis induced by long-term arsenic exposure.
منابع مشابه
Reactive Oxygen Species and Antioxidant in Seminal Plasma and Their Impact on Male Fertility
Spermatozoa generate reactive oxygen species (ROS) in physiological amounts which play a role in sperm functions during sperm capacitation acrosome reaction (AR) and oocyte fusion. In addition damaged sperm are likely to be the source of ROS. The most important ROS produced by human sperm are hydrogen peroxide superoxide anion and hydroxyl radicals. Besides human seminal plasma and sperm posses...
متن کاملProtective Effects of Hydroalcoholic Extract of Nasturtium officinale on Rat Blood Cells Exposed to Arsenic
Background: Arsenic is one of the most toxic metalloids. Anemia and leukopenia are common results of poisoning with arsenic, which may happen due to a direct hemolytic or cytotoxic effect on blood cells. The aim of this study was to examine the effects of hydroalcoholic extract of Nasturtium officinale on blood cells and antioxidant enzymes in rats exposed to sodium (meta)arsenite. Methods: 32...
متن کاملInhibitory effect of concomitant administration of Zataria multiflora Boiss. against oxidative damage-induced by sub-acute exposure to arsenic in rats
To evaluate the protective effect of Zataria multiflora boiss. (Zm) extract against arsenic-induced oxidative damage in rats. Rats were orally treated with various doses of Zm (200, 400, and 600 mg/kg) and sodium arsenite (5.5 mg/ kg), alone or in combination, once daily for 30 consecutive days. Twenty-four hours after the last dose, rats were euthanized, and biochemical studies were conducted ...
متن کاملThe effect of short-term colostrum supplementation on serum malondialdehyde levels and total antioxidant capacity due to acute resistance in healthy men
Background &aim:During intense exercise reactive species produce oxygen that results in cell damage. It seems that the use of antioxidant supplements reduces the oxidative stress caused by such exercises. Therefore the purpose of this study was to investigate the effect of short-term colostrum supplementation on serum malondialdehyde levels and total antioxidant capacity induced by acute resist...
متن کاملTroxerutin, a bioflavonoid, improves oxidative stress in blood of streptozotocin-induced type-1 diabetic rats
Type 1 diabetes is a chronic disease characterized by the body's inability to produce insulin due to destruction of the beta cells. There is increasing evidence that reactive oxygen species (ROS) play a major role in the development of diabetic complications. The purpose of this study is to investigate the effects of troxerutin administration on oxidative stress markers in blood of STZ-induced ...
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:
- Environmental Health Perspectives
دوره 109 شماره
صفحات -
تاریخ انتشار 2001