Comparison of oxidative stress response parameters in newborn mouse liver versus simian virus 40 (SV40)-transformed hepatocyte cell lines.
Induction of approximately one dozen genes and/or enzyme activities in liver of the untreated newborn c(14CoS)/c(14CoS) mouse-when compared with the c(ch)/c(14CoS) heterozygote or the c(ch)/c(ch) wild-type-is the result of enhanced levels of reactive oxygenated metabolites originating from a block in the tyrosine degradation pathway. Oxidative stress activates genes via the electrophile response element, whereas dioxin activates genes via the receptor-mediated aromatic hydrocarbon response element. Here, we compared several parameters in 14CoS/14CoS versus ch/ch newborn mouse liver with that in simian virus 40 (SV40)-transformed hepatocyte lines that had been derived from newborn liver. We showed in this study that: (a) NADP(H):quinone oxidoreductase and UDP glucuronosyltransferase 1A6 mRNA levels were increased in both the (untreated) 14CoS/14CoS newborn liver and cell line; (b) aldehyde dehydrogenase 3A1 mRNA was increased by both oxidative stress and dioxin in hepatocyte cultures, but was not detectable in liver of the intact mouse; (c) the glutathione S-transferase GSTA1, GSTP1, GSTA3, and GSTM1 mRNA levels were increased by oxidative stress in 14CoS/14CoS newborn liver, but these transcripts were either low or undetectable in the cell lines; (d) GSTA1 mRNA was up-regulated by the absence of cytochrome P450 1A1 (CYP1A1) activity (i.e. the Gsta1 gene is a member of the aromatic hydrocarbon [Ah] battery); and (e) GSTP1 mRNA was not up-regulated by the absence of CYP1A1 activity (i. e. Gstp1 is not a member of the [Ah] battery). The 14CoS/14CoS and ch/ch hepatocyte established cell lines were transformed with SV40, which expresses large T antigen; this gene product is known to bind to, and interact with, several cell cycle regulatory proteins such as p53 and the retinoblastoma protein-E2F complex. It is therefore likely that differences in the oxidative stress responses between the 14CoS/14CoS newborn liver and the immortalized hepatocyte cell line might be explained by the presence of large T antigen in the established cell line.
Vasiliou
V
V
Department of Environmental Health and Center for Ecogenetics and Environmental Health, University of Cincinnati Medical Center, OH 45267-0056, USA.
Buetler
T
T
Eaton
D L
DL
Nebert
D W
DW
D000444:Aldehyde Dehydrogenase / Q000378:metabolism; D000818:Animals; D000831:Animals, Newborn; D001426:Bacterial Proteins; D002352:Carrier Proteins / Q000378:metabolism; D002461:Cell Line, Transformed; D002472:Cell Transformation, Viral; D005260:Female; D014453:Glucuronosyltransferase / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D008099:Liver / Q000166:cytology / Q000378:metabolism*; D008297:Male; D051379:Mice; D018384:Oxidative Stress / Q000502:physiology*; D012333:RNA, Messenger / Q000378:metabolism; D013539:Simian virus 40 / Q000502:physiology
D000444:Aldehyde Dehydrogenase; D001426:Bacterial Proteins; D002352:Carrier Proteins; D014453:Glucuronosyltransferase; D005982:Glutathione Transferase; D047908:Intracellular Signaling Peptides and Proteins; D012333:RNA, Messenger; C105760:GstA protein, bacteria; C030863:corneal protein 54, bovine; C110655:UDP-glucuronosyltransferase, UGT1A6