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
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发表时间:
1989
影响因子:
3.8
通讯作者:
Stegeman,JJ
中科院分区:
文献类型:
--
作者:
Gooch,JW;Elskus,AA;Kloepper-Sams,PJ;Hahn,ME;Stegeman,JJ
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.
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影响因子:
6.1
作者:
Drug Oxidations;M. J. Coon
通讯作者:
M. J. Coon
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
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
影响因子:
2.7
作者:
E. A. Snowberger;J. Stegeman
通讯作者:
J. Stegeman