高铜日粮对肉鸡肝脏TrxR2基因mRNA表达和还原活性的影响  

Effect of High-level Copper Diet on Expression of TrxR2 mRNA and Reduction Activity of TrxR2 of Liver in Broiler

作　　者：刘好朋[1] 唐兆新[1,2] 苏荣胜[1] 胡京京[1] 韩前彪[1] 胡锴[1] 刘传敦[1] 万婷[1] 

机构地区：[1]华南农业大学兽医学院,广州510642 [2]广东省兽用生物制品技术研究与应用企业重点实验室,肇庆527400

出　　处：《畜牧兽医学报》2011年第3期423-428,共6页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：国家自然科学基金(30871900)

摘　　要：本文旨在了解高铜日粮对肉鸡肝脏TrxR2基因mRNA表达和还原活性的影响。200羽1日龄Cobb商品代肉鸡随机分为4组,各组日粮中铜含量分别为:对照组(Ⅰ组)11mg.kg-1、试验Ⅱ组110mg.kg-1、试验Ⅲ组330mg.kg-1和试验Ⅳ组550mg.kg-1。饲养至10、30、50d时每组各取5只鸡用于采集肝脏样品,提取肝脏线粒体用DTNB法测定肝脏TrxR2的还原活性,提取肝脏总RNA用RT-PCR法测定TrxR2mRNA在肝脏中的表达量。结果显示,饲喂铜含量为550mg.kg-1日粮50d时还原活性降低(P<0.05)、TrxR2基因mRNA的表达量降低(P<0.05),饲喂铜含量为330mg.kg-1日粮30d时TrxR2的还原活性升高(P<0.05)、50d时降低(P>0.05),表明饲喂高铜日粮(330～550mg.kg-1)可导致TrxR2mRNA在肝脏中的表达量降低,还原活性先升高后降低。In order to examine the effect of high dietary copper on expression of TrxR2 mRNA in liver,and the reduction activity of TrxR2,the experiment was conducted with two hundred healthy 1 day-old Cobb broilers which were randomly divided into four groups based on diets as follows： control group（Cu 11 mg·kg-1 as the group Ⅰ） and high copper groups（Cu content 110,330,550 mg·kg-1,named group Ⅱ、Ⅲ and Ⅳ）.The liver was taken from broiler in each group at the 10th,30th and 50th days,respectively,reduction activity of the liver TrxR2 was determined by the method of DTNB,and the testing material was liver mitochondria which has been extraction from the liver,and the expression of the liver TrxR2 was determined by the method of semi-quantification and reverse transcription polymerase chain reaction（RT-PCR）.The results showed that the reduction activity of liver TrxR2 decreased（P0.05） and the expression of TrxR2 mRNA was reduced（P0.05）at 50 d of Group Ⅳ,the reduction activity of liver TrxR2 was increased（P0.05） at 30 d and reduced（P0.05）at 50 d of Group Ⅲ,The experiental results indicated that fed high copper diets（330-550 mg·kg-1） could decrease TrxR2 mRNA expression in the liver and increase the reduction activity of TrxR2 first,and decrease it on 50 days.

关 键 词：肉鸡 肝脏 硫酸铜 TrxR2 MRNA 还原活性 

分 类 号：S856.9[农业科学—临床兽医学]