Decreased glutamine synthetase, increased citrulline–nitric oxide cycle activities, and oxidative stress in different regions of brain in epilepsy rat model

Swamy, Mummedy and Wan Yusof, Wan Roslina and Sirajudeen, K. N. S. and Mustapha, Zulkarnain and Govindasamy, Chandran (2011) Decreased glutamine synthetase, increased citrulline–nitric oxide cycle activities, and oxidative stress in different regions of brain in epilepsy rat model. Journal of Physiology and Biochemistry., 67. pp. 105-113.

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Official URL: http://www.ncbi.nlm.nih.gov/pubmed/20960085

Abstract

To understand their role in epilepsy, the nitric oxide synthetase (NOS), argininosuccinate synthetase (AS), argininosuccinate lyase (AL), glutamine synthetase (GS), and arginase activities, along with the concentration of nitrate/nitrite (NOx), thiobarbituric acid reactive substances (TBARS), and total antioxidant status (TAS), were estimated in different regions of brain in rats subjected to experimental epilepsy induced by subcutaneous administration of kainic acid (KA). The short-term (acute) group animals were killed after 2 h and the long term (chronic) group animals were killed after 5 days of single injection of KA (15 mg/kg body weight). After decapitation of rats, the brain regions were separated and in their homogenates, the concentration of NOx, TBARS and TAS and the activities of NOS, AS, AL, arginase and glutamine synthetase were assayed by colorimetric methods. The results of the study demonstrated the increased activity of NOS and formation of NO in acute and chronic groups epilepsy. The activities of AS and AL were increased and indicate the effective recycling of citrulline to arginine. The activity of glutamine synthetase was decreased in acute and chronic groups of epilepsy compared to control group and indicate the modulation of its activity by NO in epilepsy. The activity of arginase was not changed in acute group; however it was decreased in chronic group and may favor increased production of NO in this condition. The concentration TBARS were increased and TAS decreased in acute and chronic groups of epilepsy and supports the oxidative stress in epilepsy.

Item Type: Article
Additional Information: Universiti Malaysia Sarawak, UNIMAS
Uncontrolled Keywords: Nitric oxide, Citrulline NO cycle enzymes, Glutamine synthetase, Thiobarbituricacid reactive substances, Total antioxidant status, Epilepsy, research, education, IPTA, UNIMAS, Universiti Malaysia Sarawak, Malaysia, university, universiti, Sarawak, Kuching, Samarahan, undergraduate, postgraduate
Subjects: Q Science > QD Chemistry
Q Science > QP Physiology
Divisions: Academic Faculties, Institutes and Centres > Centre for Pre-University Studies
Depositing User: Karen Kornalius
Date Deposited: 26 Feb 2014 01:53
Last Modified: 14 Sep 2015 04:38
URI: http://ir.unimas.my/id/eprint/694

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