Abstract:
:Since experiments with freshly isolated rat hepatocytes have shown that cellular vitamin E is consumed in response to insult by compounds that induce an oxidative stress only after cellular glutathione (GSH) concentrations have been substantially depleted, experiments were performed to determine whether this sequence of events occurred in response to oxidative insult in vivo. The role that plasma vitamin E plays in the response to chemically induced oxidative injury in vivo was also assessed. Treatments with 40 mg/kg of methyl ethyl ketone peroxide (MEKP) quickly induced lipid peroxidation in vivo and from one to 4 h after treatment caused a depression in the plasma content of vitamin E and the liver content of GSH, as well as signs of toxicity (elevations in serum activities of alanine and aspartate aminotransferases). At these time points however, the liver content of vitamin E was either indistinguishable from or slightly elevated from controls. By 12 to 24 h after treatment the liver content of vitamin E was reduced by 20-25% whereas values for all other indicators had returned toward control levels. Pretreatment of rats with L-buthionine-S,R-sulfoximine, an inhibitor of GSH by 4 or 24 h after treatment, did not alter the time course or extent of hepatic vitamin E depletion that was observed after treatment with MEKP. Other compounds that induce oxidative stress and lipid peroxidation to the liver, carbon tetrachloride and menadione, did not provoke an alteration in hepatic vitamin E levels as compared to controls 1 day after treatment. These findings indicate that depletion of hepatic vitamin E may not occur as an immediate consequence of oxidative insult to the liver and that the depletion of hepatic vitamin E levels may not be related to the extent of prior GSH depletion. Moreover, these findings suggest that alterations in the plasma concentration of vitamin E may not reflect concurrent alterations in hepatic vitamin E levels. A mechanism whereby liver vitamin E stores are mobilized for the maintenance of plasma vitamin E levels is proposed.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Warren DL,Reed DJdoi
10.1016/0003-9861(91)90326-esubject
Has Abstractpub_date
1991-02-15 00:00:00pages
45-52issue
1eissn
0003-9861issn
1096-0384pii
0003-9861(91)90326-Ejournal_volume
285pub_type
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journal_title:Archives of biochemistry and biophysics
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doi:10.1006/abbi.1994.1105
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(86)90120-7
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journal_title:Archives of biochemistry and biophysics
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更新日期:1998-12-01 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1999.1589
更新日期:2000-03-01 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1006/abbi.1994.1302
更新日期:1994-07-01 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
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更新日期:2001-03-15 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(88)90135-x
更新日期:1988-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:2000-08-01 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
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更新日期:2013-07-15 00:00:00
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journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(91)90276-o
更新日期:1991-01-01 00:00:00
abstract::In this report we provide data, for the first time, demonstrating the conversion of the heme moiety of certain cytochrome P-450 and P-420 preparations, to biliverdin, catalyzed by heme oxygenase. We have used purified preparations of cytochromes P-450c, P-450b, P-450/P-420c, or P-450/P-420b as substrates in a heme oxy...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(88)90492-4
更新日期:1988-02-01 00:00:00
abstract::An in vitro expression plasmid (pGRAP) that contained the cDNA coding for the rat mitochondrial aldehyde dehydrogenase precursor was constructed, mRNA was synthesized then translated, and the in vitro synthesized precursor of aldehyde dehydrogenase was used in an in vitro import assay. As expected the 19 amino acid si...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
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更新日期:1989-08-01 00:00:00
abstract::In the present study, the hepatic microsomal and peroxisomal bifunctional trans-2-enoyl CoA hydratases were isolated and purified from rats treated with 2% di-(2-ethylhexyl)phthalate for 8 days. These two enzymes (microsomal and peroxisomal) were purified with the identical purification procedures and had identical mo...
journal_title:Archives of biochemistry and biophysics
pub_type: 杂志文章
doi:10.1016/0003-9861(87)90042-7
更新日期:1987-02-01 00:00:00