| dc.creator | FERNÁNDEZ,VIRGINIA | |
| dc.creator | MASSA,LAURA | |
| dc.creator | QUIÑONES,LUIS | |
| dc.creator | SIMON-GIAVAROTTI,KARIN A | |
| dc.creator | GIAVAROTTI,LEANDRO | |
| dc.creator | D'ALMEIDA,VÂNIA | |
| dc.creator | AZZALIS,LIGIA A | |
| dc.creator | JUNQUEIRA,VIRGINIA BC | |
| dc.creator | VIDELA,LUIS A | |
| dc.date | 2003-01-01 | |
| dc.date.accessioned | 2020-02-17T15:32:41Z | |
| dc.date.available | 2020-02-17T15:32:41Z | |
| dc.identifier | https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000300007 | |
| dc.identifier.uri | https://revistaschilenas.uchile.cl/handle/2250/130345 | |
| dc.description | 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. NADPH-dependent 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 | |
| dc.format | text/html | |
| dc.language | en | |
| dc.publisher | Sociedad de Biología de Chile | |
| dc.relation | 10.4067/S0716-97602003000300007 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.source | Biological Research v.36 n.3-4 2003 | |
| dc.subject | g-Hexachlorocyclohexane | |
| dc.subject | L-3,3',5-Triiodothyronine | |
| dc.subject | Superoxide radical | |
| dc.subject | Cytochrome P4502E1 | |
| dc.subject | Rat liver | |
| dc.title | 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 | |
