Effects of ortho- and non-ortho-substituted polychlorinated biphenyl congeners on the hepatic monooxygenase system in scup (Stenotomus chrysops).

Effects of ortho- and non-ortho-substituted polychlorinated biphenyl congeners on the hepatic monooxygenase system in scup (Stenotomus chrysops).
复制标题

邻位和非邻位取代的多氯联苯同系物对 scup(Stenotomus chrysops)肝单加氧酶系统的影响。

DOI:
10.1016/0041-008x(89)90171-3
复制
发表时间:
1989
影响因子:
3.8
通讯作者:
Stegeman,JJ
Stegeman,JJ
中科院分区:
医学3区
文献类型:
--
作者:
Gooch,JW;Elskus,AA;Kloepper-Sams,PJ;Hahn,ME;Stegeman,JJ

文献摘要

参考文献

被引文献

相似文献

环境样品中大量存在的多氯联苯同系物,已知可诱导哺乳动物P450IA基因亚家族中的肝脏单加氧酶同工酶,研究人员检测了它们在海洋硬骨鱼scup中诱导肝脏单加氧酶活性的能力。分别给Scup注射3,3 ',4,4 ' -四氯联苯(同属77),2,3,3 ',4,4 ' -五氯联苯(同属105),2,3 ',4,4 ‘,5-五氯联苯(同属118),2,2 ’,3,4,4 ',5 ' -六氯联苯(同属138),2,2 ',3,3 ',4,4 ' -六氯联苯(同属128)或β-萘黄酮,并检测乙氧基间苯二酚o -去乙基酶(EROD)活性,免疫检测细胞色素P450E (Scup中的EROD催化剂)和P450E的体外可翻译mRNA的增加。仅3,3 ',4,4 ' -四氯联苯(TCB)对单加氧酶参数有显著的诱导作用。然而,尽管所有剂量(1、5和10 mg/kg)都诱导了P450E的可翻译mRNA,但与1 mg/kg剂量相比,5和10 mg/kg剂量的EROD活性和P450E均有所降低。肝内残余TCB浓度与EROD活性降低之间的密切关系在TCB的高剂量下是明显的。氨基吡啶n -去甲基化酶是一种不受P450E催化的单加氧酶活性,不受TCB处理的影响,表明TCB效应具有特异性。体外分析表明,TCB是一种有效的竞争性EROD活性抑制剂,在0.3 μm,接近km处对乙氧基间苯甲醚具有半最大抑制作用,提示TCB体内作用的一种机制。这些结果表明,具有邻氯取代的多氯联苯同系物,在哺乳动物中是AHH和EROD活性的有效诱导剂,在测试的剂量下,作为硬骨鱼的诱导剂是无效的。
Polychlorinated biphenyl congeners that are abundant in environmental samples, and known to induce hepatic monooxygenase isozymes in the P450IA gene subfamily in mammals, were examined for their ability to induce hepatic monooxygenase activity in scup, a marine teleost. Scup were dosed ip with 3,3′,4,4′-tetrachlorobiphenyl (congener 77), 2,3,3′,4,4′-pentachlorobiphenyl (congener 105), 2,3′,4,4′,5-pentachlorobiphenyl (congener 118), 2,2′,3,4,4′,5′-hexachlorobiphenyl (congener 138), 2,2′,3,3′,4,4′-hexachlorobiphenyl (congener 128), or β-naphthoflavone and examined for increases in ethoxyresorufin O-deethylase (EROD) activity, immunodetectable cytochrome P450E (the EROD catalyst in scup), and in vitro translatable mRNA for P450E. Monooxygenase parameters were significantly induced only by 3,3′,4,4′-tetrachlorobiphenyl (TCB). However, while translatable mRNA for P450E was induced at all doses (1, 5, and 10 mg/kg), EROD activity and P450E were decreased at the 5 and 10 mg/kg doses, relative to the response at 1 mg/kg. A strong relationship between residual TCB concentration in the liver and the decreased EROD activity was evident at the higher doses of TCB. Aminopyrine N-demethylase, a monooxygenase activity not catalyzed by P450E, was unaffected by TCB treatment, indicating a specificity in the TCB effect. Analysis in vitro revealed that TCB was a potent competitive inhibitor of EROD activity, with half-maximal inhibition at 0.3 μm, near the Kmfor ethoxyresorufin, suggesting one mechanism for the in vivo effect of TCB. These results demonstrate that PCB congeners with ortho-chlorine substitution, and which are effective inducers of AHH and EROD activity in mammals, are ineffective, at the doses tested, as inducers in the teleost scup.
微粒体、药物氧化和化学致癌作用
DOI: 10.1016/b978-0-12-187701-9.x5001-3
发表时间: 1980
期刊: Life sciences
影响因子: 6.1
作者:
Drug Oxidations;M. J. Coon
通讯作者: M. J. Coon
β-萘黄酮处理后硬骨鱼眼底异斜体中 P450E 蛋白含量、催化活性和 mRNA 水平之间的时间关系。
DOI: 10.1016/0003-9861(89)90319-6
发表时间: 1989
影响因子: 3.9
作者:
Kloepper-Sams,PJ;Stegeman,JJ
通讯作者: Stegeman,JJ
DOI: 10.1016/b978-0-12-187702-6.50042-6
发表时间: 1980
期刊: Microsomes, Drug Oxidations and Chemical Carcinogenesis
影响因子: --
作者:
R. Franklin;C. Elcombe;M. Vodicnik;J. Lech
通讯作者: J. Lech
明显的细胞色素 P-450 诱导作为比目鱼 Platichthys flesus 暴露于环境化学物质的指示
DOI: --
发表时间: 1988
期刊:
影响因子: --
作者:
J. Stegeman;B. Woodin;Anders Goksøyr
通讯作者: Anders Goksøyr
DOI: 10.1016/0016-6480(87)90275-9
发表时间: 1987
影响因子: 2.7
作者:
E. A. Snowberger;J. Stegeman
通讯作者: J. Stegeman