苯并[a]芘对黑鲷肝脏GST活性的影响及其与肝脏代谢酶和胆汁代谢产物之间的变化关系Effects of Benzoapyrene Exposure on Hepatic GST Activity in Black Porgy(Sparus macrocephalus)and Variation Relationships with Hepatic Metabolic Enzymes and Biliary Metabolites
穆景利;王新红;林建清;林小龙;洪华生;
摘要(Abstract)：
为探讨苯并[a]芘(B[a]P)暴露对鱼类的影响并筛选特异、敏感的生物标志物,研究了B[a]P对黑鲷(Sparus macrocephalus)肝脏谷胱甘肽-S-转移酶(GST)活性的影响,并分析了肝脏7-乙氧基异吩唑酮-脱乙基酶(EROD)、GST活性与胆汁中B[a]P典型代谢产物3-羟基-苯并[a]芘(3-OHB[a]P)3者之间及与B[a]P之间的剂量、时间-效应关系.结果显示:在B[a]P(0.5、1.0、2.0和5.0μg·L-1)暴露期间,肝脏GST活性随暴露时间总体呈"钟"形的变化趋势,在第2d时达到峰值;在第12h、1d和2d时,GST活性与B[a]P暴露浓度呈显著正相关(R12h=0.966(p<0.05)、R1d=0.953(p<0.05)、R2d=0.824(p<0.05)).与前期研究结果对比分析发现,B[a]P(0.5、1.0、2.0和5.0μg·L-1)暴露7d时,胆汁中3-OHB[a]P浓度与B[a]P暴露浓度呈显著的剂量-效应关系(R=0.943,p<0.05);黑鲷肝脏GST、EROD活性与3-OHB[a]P的对数浓度均呈显著正相关(RGST=0.740(p<0.05)、REROD=0.839(p<0.05));2.0μg·L-1B[a]P暴露后,黑鲷肝脏EROD、GST活性与3-OHB[a]P随暴露时间的变化趋势基本相同,但并不完全一致.鱼类肝脏EROD、GST与胆汁中B[a]P代谢产物3者之间的变化关系较为复杂,暴露浓度和时间是影响其变化的重要因素,肝脏GST和EROD活性比胆汁中代谢产物更易受其影响,在B[a]P的环境监测中代谢产物可能是一种更为可行的生物标志物.
关键词(KeyWords)： 代谢产物;谷胱甘肽-S-转移酶;7-乙氧基异吩唑酮-脱乙基酶;代谢机制;胆汁;3-羟基-苯并[a]芘;黑鲷
基金项目(Foundation): 国家“863”项目(No.2007AA09Z126);; 国家自然科学基金项目(No.40106012;40476048;20777060);; 海洋公益性行业科研专项经费(No.200805090);; 国家海洋局青年基金(No.2008613);; 国家海洋局近岸海域生态环境重点实验室基金(No.200712)
作者(Author): 穆景利;王新红;林建清;林小龙;洪华生;
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