Acute effect of aspartame-induced oxidative stress in Wistar albino rat brain  

作　　者：Iyaswamy Ashok Rathinasamy Sheeladevi Dapkupar Wankhar 

机构地区：[1]Department of Physiology,Dr.ALM PG Institute of Basic Medical Sciences,University of Madras,Sekkizhar Campus

出　　处：《The Journal of Biomedical Research》2015年第5期390-396,共7页生物医学研究杂志（英文版）

基　　金：financial assistance was provided by the University of Madras

摘　　要：The present study was carried out to investigate the acute effect of aspartame on oxidative stress in the Wistar albino rat brain. We sought to investigate whether acute administration of aspartame （75 mg/kg） could release methanol and induce oxidative stress in the rat brain 24 hours after administration. To mimic human methanol metabolism, methotrexate treated rats were used to study aspartame effects. Wistar strain male albino rats were administered with aspartame orally as a single dose and studied along with controls and methotrexate treated controls. Blood methanol and formate level were estimated after 24 hours and rats were sacrificed and free radical changes were observed in discrete regions by assessing the scavenging enzymes, reduce dglutathione （GSH）, lipid peroxidation and protein thiol levels. There was a significant increase in lipid peroxidation levels, superoxide dismutase activity （SOD）, glutathione peroxidase levels （GPx）, and catalase activity （CAT） with a significant decrease in GSH and protein thiol. Aspartame exposure resulted in detectable methanol even after 24 hours. Methanol and its metabolites may be responsible for the generation of oxidative stress in brain regions. The observed alteration in aspartame fed animals may be due to its metabolite methanol and elevated formate. The elevated free radicals due to methanol induced oxidative stress.The present study was carried out to investigate the acute effect of aspartame on oxidative stress in the Wistar albino rat brain. We sought to investigate whether acute administration of aspartame （75 mg/kg） could release methanol and induce oxidative stress in the rat brain 24 hours after administration. To mimic human methanol metabolism, methotrexate treated rats were used to study aspartame effects. Wistar strain male albino rats were administered with aspartame orally as a single dose and studied along with controls and methotrexate treated controls. Blood methanol and formate level were estimated after 24 hours and rats were sacrificed and free radical changes were observed in discrete regions by assessing the scavenging enzymes, reduce dglutathione （GSH）, lipid peroxidation and protein thiol levels. There was a significant increase in lipid peroxidation levels, superoxide dismutase activity （SOD）, glutathione peroxidase levels （GPx）, and catalase activity （CAT） with a significant decrease in GSH and protein thiol. Aspartame exposure resulted in detectable methanol even after 24 hours. Methanol and its metabolites may be responsible for the generation of oxidative stress in brain regions. The observed alteration in aspartame fed animals may be due to its metabolite methanol and elevated formate. The elevated free radicals due to methanol induced oxidative stress.

关 键 词：ASPARTAME blood methanol oxidative stress ANTIOXIDANT free radical 

分 类 号：R741[医药卫生—神经病学与精神病学]