Influence of Iron Supplementation on DMT1(IRE)-induced Transport of Lead by Brain Barrier Systems in vivo

作     者：AN Dai Zhi AI Jun Tao FANG Hong Juan SUN Ru Bao SHI Yun WANG Li Li WANG Qiang 

作者机构：Institute of Disease Control and PreventionAcademy of Military Medical Sciences Beijing Vocational College of Agriculture Beijing Tian Tan HospitalCapital Medical University 

出 版 物：《Biomedical and Environmental Sciences》 (生物医学与环境科学（英文版）)

年 卷 期：2015年第28卷第9期

页      面：651-659页

核心收录：

学科分类：100405[医学-卫生毒理学] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 10[医学] 

基　　金：supported by National Natural Science Foundation of China(No.81472478) Medical Science Youth Breeding Project of PLA(13QNP161) 

主　　题：Lead Iron Blood brain barrier Divalent metal transporter 1 MAPK pathway 

摘      要：Objective To investigate the potential involvement of DMT1（IRE） protein in the brain vascular system in vivo during Pb exposure. Methods Three groups of male Sprague-Dawley rats were exposed to Pb in drinking water, among which two groups were concurrently administered by oral gavage once every other day as the low and high Fe treatment group, respectively, for 6 weeks. At the same time, the group only supplied with high Fe was also set as a reference. The animals were decapitated, then brain capillary-rich fraction was isolate from cerebral cortex. Western blot method was used to identify protein expression, and RT-PCR to detect the change of the m RNA. Results Pb exposure significantly increased Pb concentrations in cerebral cortex. Low Fe dose significantly reduced the cortex Pb levels, However, high Fe dose increased the cortex Pb levels. Interestingly, changes of DMT1（IRE） protein in brain capillary-rich fraction were highly related to the Pb level, but those of DMT1（IRE） m RNA were not significantly different. Moreover, the consistent changes in the levels of p-ERK1/2 or IRP1 with the changes in the levels of DMT1（IRE）. Conclusion These results suggest that Pb is transported into the brain through DMT1（IRE）, and the ERK MAPK pathway is involved in DMT1（IRE）-mediated transport regulation in brain vascular system in vivo.