Neurobehavioral Assessment of Rats Exposed to Yttrium Nitrate during Development  

作　　者：LI Chen Xi MA Chuan FANG Hai Qin ZHI Yuan YU Zhou XU Hai Bin JIA Xu Dong 

机构地区：[1]National Institute for Nutrition and Food Safety, Chinese Center for Disease Control and Prevention [2]Key Laboratory of Food Safety Risk Assessment of Ministry of Health, China National Center for Food Safety Risk Assessment

出　　处：《Biomedical and Environmental Sciences》2015年第4期281-290,共10页生物医学与环境科学（英文版）

基　　金：financially supported by the National Science and Technology Support Program(2012BAK01B00)

摘　　要：Objective The aim of this study was to assess the effects of yttrium nitrate on neurobehaviora development in Sprague-Dawley rats. Methods Dams were orally exposed to 0, 5, 15, or 45 mg/kg daily of yttrium nitrate from gestation day （GD） 6 to postnatal day （PND） 21. Body weight and food consumption were monitored weekly. Neurobehavior was assessed by developmental landmarks and reflexes, motor activity, hot plate, Rota-rod and cognitive tests. Additionally, brain weights were measured on PND 21 and 70. Results No significant difference was noted among all groups for maternal body weight and food consumption. All yttrium-exposed offspring showed an increase in body weight on PND 21; however, no significant difference in body weight for exposed pups versus controls was observed 2 weeks or more after the yttrium solution was discontinued. The groups given 5 mg/kg daily decreased significantly in the duration of female forelime grip strength and ambulation on PND 13. There was no significant difference between yttrium-exposed offspring and controls with respect to other behavioral ontogeny parameters and postnatal behavioral test results. Conclusion Exposure of rats to yttrium nitrate in concentrations up to 45 mg/kg daily had no adverse effects on their neurobehavioral development.Objective The aim of this study was to assess the effects of yttrium nitrate on neurobehaviora development in Sprague-Dawley rats. Methods Dams were orally exposed to 0, 5, 15, or 45 mg/kg daily of yttrium nitrate from gestation day （GD） 6 to postnatal day （PND） 21. Body weight and food consumption were monitored weekly. Neurobehavior was assessed by developmental landmarks and reflexes, motor activity, hot plate, Rota-rod and cognitive tests. Additionally, brain weights were measured on PND 21 and 70. Results No significant difference was noted among all groups for maternal body weight and food consumption. All yttrium-exposed offspring showed an increase in body weight on PND 21; however, no significant difference in body weight for exposed pups versus controls was observed 2 weeks or more after the yttrium solution was discontinued. The groups given 5 mg/kg daily decreased significantly in the duration of female forelime grip strength and ambulation on PND 13. There was no significant difference between yttrium-exposed offspring and controls with respect to other behavioral ontogeny parameters and postnatal behavioral test results. Conclusion Exposure of rats to yttrium nitrate in concentrations up to 45 mg/kg daily had no adverse effects on their neurobehavioral development.

关 键 词：Rare earth elements YTTRIUM Developmental neurotoxicity NEUROBEHAVIOR 

分 类 号：R114[医药卫生—卫生毒理学]