Tag Archives: nitrate

Nitrate and nitrite in drinking water affect antioxidant enzymes in erythrocytes of rats

E. Sierra-Campos1, M. A. Valdez-Solana1, M. I. Campos-Almazán1,
C. Avitia-Domínguez2, J. L. Hernández-Rivera1, J. A. De Lira-Sánchez1,
G. Garcia-Arenas3, A. Téllez-Valencia2

1Faculty of Chemical Sciences, Campus Gómez Palacio, University Juarez of Durango State, Gomez Palacio, Durango, Mexico;
e-mail: ericksier@gmail.com;
2Faculty of Medicine and Nutrition, Campus Durango, University Juarez of Durango State, Durango, Mexico;
3Faculty of Health Sciences, Campus Gómez Palacio, University Juarez of Durango State, Gomez Palacio, Durango, Mexico

The present study evaluated the effect of short term intake of nitrite and nitrate drinking water on the antioxidant system and membrane damage of rat erythrocytes. Wistar rats were randomly divided into three groups as follows; the group I received only distilled water ad libitum; the group II was given water with nitrate (a dose of 124 mg/kg of nitrate-nitrogen) as drinking water and the group III was given nitrites dissolved in distilled water in a dose of 150 mg/kg for 7 days. At the end of the study, group III rats showed a significant decrease in activities of glutathione peroxidase (GPx), glucose 6-phosphate dehydrogenase (G6PDH) and catalase (CAT), while in group II rats, the activity of GPx and CAT were significantly reduced, but no significant changes in glutathione reductase activity and peroxynitrite levels were observed. On the other hand, malondialdehyde (MDA) was increased in both groups with respect to group I. Also, our major results indicate that all treatments changed methemoglobin levels and osmotic fragility in comparison to group I rats. The intensity of alterations was found more severe in rats of group III, followed by rats of group II. It can be concluded from these observations that nitrate or nitrite leads to alterations in the erythrocytes antioxidant defense status mainly throughout NADPH relate enzymes.

The effect of agmatine on L-arginine metabolism in erythrocytes under streptozotocin-induced diabetes in rats

I. V. Ferents, I. V. Brodyak, M. Ya. Lyuta,
V. A. Burda, A. M. Fedorovych, N. O. Sybirna

Ivan Franko National University of Lviv, Ukraine;
e-mail: sybirna_natalia@yahoo.com

The effects of agmatine on oxidative and non-oxidative metabolic pathways of L-arginine were investigated both in plasma and erythrocytes under experimental diabetes mellitus. It was indicated, that agmatine prevents the development of oxidative-nitrosative stress in diabetic rats. After treatment of animals by agmatine NO-synthase methabolic pathway of L-arginine is depressed whereas arginase one increases in erythrocytes of rats with experimental diabetes mellitus.