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Effects of g-hexachlorocyclohexane and L-3,3,,5- triiodothyronine on rat liver cytochrome P4502E1- dependent activity and content in relation to microsomal superoxide radical generation

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2003
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Fernández Arancibia, Virginia
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Effects of g-hexachlorocyclohexane and L-3,3,,5- triiodothyronine on rat liver cytochrome P4502E1- dependent activity and content in relation to microsomal superoxide radical generation
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  • Fernández Arancibia, Virginia;
  • Massa, Laura;
  • Quiñones Sepúlveda, Luis;
  • Simon-Giavarotti, Karin A.;
  • Giavarotti, Leandro;
  • D'Almeida, Vânia;
  • Azzalis, Ligia A.;
  • Junqueira, Virginia;
  • Videla Cabrera, Luis;
Abstract
Liver microsomal cytochrome P4502E1-dependent p-nitrophenol (PNP) hydroxylation and expression of cytochrome P4502E1 were studied in rats subjected to g-hexachlorocyclohexane (HCCH) or L-3,3,,5- triiodothyronine (T3) administration as a possible mechanism contributing to superoxide radical (O2 .-) generation. HCCH treatment (a single dose of 40 mg/kg body wt) produced a 43% increase in the content of total cytochrome P450, whereas T3 (daily doses of 0.1 mg/kg body wt for two consecutive days) led to a 37% decrease. NADPHdependent O2 .- generation was elevated by HCCH and T3, expressed as either per mg of protein or per nmol of cytochrome P450, with a 135% enhancement in the O2 .- production/superoxide dismutase (SOD) activity ratios being observed in both conditions. This was partly due to depression of SOD activity. Concomitantly, the molecular activity of NADPH-cytochrome p450 reductase was enhanced by 90 and 69% by HCCH and T3, respectively. In these conditions, microsomal PNP hydroxylation showed increases of 58 and 45% in HCCH- and T3-treated rats over control values, respectively, with a parallel 31% (HCCH) and 41% (T3) enhancement in the content of cytochrome P4502E1 assessed by western immunoblotting. We conclude that HCCH and T3 enhance the expression and activity of cytochrome P4502E1 and that of NADPH-cytochrome P450 reductase in rat liver, regardless of the changes in total cytochrome P450 content, representing major contributory mechanisms to microsomal NADPH-dependent O2 .- generation.
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This work was supported by grants 1030499 from FONDECYT (Chile) and 97/02335-5 from FAPESP and 301420/79-3 from CNPq (Brasil).
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URI: https://repositorio.uchile.cl/handle/2250/129036
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Biol Res 36: 359-365, 2003
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