全氟辛烷磺酸盐(PFOS)胁迫对翡翠贻贝抗氧化酶的影响  

Effects of Perfluorooctane Sulfonate(PFOS) Exposure on Antioxidant Enzymes of Perna viridis

作　　者：王贺威[1,2] 马胜伟[1] 张喆[1] 陈海刚[1] 黄志斐[1,2] 巩秀玉[1,3] 蔡文贵[1] 贾晓平[1] 

机构地区：[1]中国水产科学研究院南海水产研究所广东省渔业生态环境重点实验室农业部南海渔业资源环境重点野外科学观测实验站,广州510300 [2]上海海洋大学海洋科学学院,上海210306 [3]上海海洋大学水产与生命学院,上海210306

出　　处：《生态毒理学报》2012年第5期508-516,共9页Asian Journal of Ecotoxicology

基　　金：广东省科技计划项目(2009B030600001);广东省科技计划项目(2011A060902006);广东省渔业生态环境重点实验室重点开放课题(GDKL2010-001);中央级公益性科研院所基本科研业务费专项资金项目(2009YD01、2010YD04、2010TS12)

摘　　要：为了解全氟辛烷磺酸盐(PFOS)对海洋贝类抗氧化防御系统的毒性效应及致毒机理,在实验室条件下研究了PFOS对翡翠贻贝的96h急性毒性,同时探讨PFOS胁迫和净水恢复过程中翡翠贻贝外套膜和内脏团组织中抗氧化指标(SOD活性、GSH和MDA含量)的变化。结果显示,PFOS对翡翠贻贝的96h半致死浓度(LC50)为68.3mg·L-1,安全浓度为6.83mg·L-1。在PFOS胁迫阶段,1mg·L-1浓度组外套膜SOD活性显著性升高(p<0.05),内脏团SOD酶活性显著降低(p<0.05);而PFOS浓度高于1mg·L-1时,外套膜SOD活性显著性降低(p<0.05),内脏团SOD活性显著升高(p<0.05)。PFOS胁迫对翡翠贻贝外套膜和内脏团中GSH含量均有显著的诱导作用(p<0.05),PFOS胁迫15d后各浓度组GSH含量均受到显著的抑制(p<0.05)。翡翠贻贝外套膜MDA含量受PFOS胁迫后显著升高(p<0.05),内脏团MDA含量的变化呈先降低、后升高的规律。净水释放阶段,翡翠贻贝两组织中SOD活性在释放7d后均恢复至对照组水平,GSH含量和MDA含量呈显著升高的趋势(p<0.05)。研究结果表明,PFOS暴露能够引起翡翠贻贝外套膜和内脏团氧化胁迫,但这种损伤的效果不明显,释放短时间后即可自我恢复。To understand the toxic effect and mechanism of perfluorooctane sulfonate （PFOS） on antioxidantdefense system of marine shellfish, the laboratory experiment was conducted with 96 h acute toxicity test and the semi- static toxicity test. The results showed that 96 h-LC50values of PFOS on Pema viridis was 68.3 mg L＂ t,and the safe concentration of PFOS on Perna virMis was 6.83 mg·L^-1. After the PFOS exposure of Pema v/r/dis, superoxide dismutase （SOD） activities increased in mantle and decreased in visceral significantly at the concentration of 1 mg.L ^-1（p 〈0.05）, which decreased in mantle and increased in visceral with the increasing concentration ofPFOS （p 〈0.05）. Glutathione （GSH）content in mantle and visceral ofPerna viridis was signifi- cantly induced compared with the control （p 〈0.05）, with the increasing exposure time, which was inhibited in each group after 15 d exposure ofPFOS （p 〈0.05）. Malondialdehye （MDA） content in mantle increased signifi- cantly during the period of exposure of PFOS; while MDA content in visceral decreased firstly and then in- creased during the stress stage of PFOS. During the phase of recovery with clear seawater, SOD activities re- covered to the same level with control group, however, there was a rising tendency for all the content of GSH and MDA in 2 tissues ofPerna viridis after 7 - days recovery （p 〈0.05）. The results showed that PFOS expo- sure could cause oxidative stress on mantle and visceral ofPerna viridis, however, the stress compressed by PFOS could be recovered quickly after a short period release of PFOS .

关 键 词：翡翠贻贝 全氟辛烷磺酸钾 超氧化物歧化酶(SOD) 谷胱甘肽(GSH) 丙二醛(MDA) 

分 类 号：X171.5[环境科学与工程—环境科学]