Abstract:
:Changes in body weight, feed intake, hepatic cellularity, and intermediary metabolism were assessed in the mature male (450 g) rat following 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) administration. All animals were schedule-fed (8-hr feeding period/24 hr) and treated with a single oral dose of either TCDD (75 micrograms/kg) or vehicle. Blood and tissues were sampled 16 to 18 hr following the end of the feeding period on 2, 4, 6, and 8 days post-treatment. Mature rats treated with TCDD exhibited a slight but progressive reduction in both body weight and feed intake throughout the 8-day experimental period. An increase in liver mass that was apparent at 2 days and plateaued by 4 days after TCDD treatment was associated with a decrease in the concentration of DNA per gram of wet liver. However, the total liver content of DNA in TCDD-treated rats remained similar to pair-fed animals. Thus, TCDD treatment produced liver enlargement in the mature rat that was the result of hepatocellular hypertrophy and not an increase in cell number. Hepatic glycogen content in TCDD-treated rats was threefold higher than their pair-fed counterparts at 2 to 6 days post-treatment, and this augmentation would account, in part, for the hypertrophy of the liver cell found after administration of TCDD. Plasma glucose and lactate concentrations were similar in TCDD-treated and pair-fed rats, suggesting that the Cori cycle remained unaltered following TCDD administration. Likewise, heart and gastrocnemius glycogen concentrations were similar in all experimental groups. Urinary excretion of urea, ammonia, and creatinine was comparable in TCDD-treated rats and their pair-fed counterparts, indicative of a nitrogen balance that was not disturbed by TCDD. Plasma glutamine concentrations in TCDD-treated rats tended to be reduced and were significantly lower at Day 6 post-treatment when compared to those of pair-fed counterparts, suggestive that amino acid release from muscle was not enhanced in TCDD-treated rats. Likewise, plasma concentrations of branched-chain amino acids, which are metabolized to a large extent in muscle, tended to be lower on Day 6 following TCDD treatment. Yet at Day 6 post-treatment, the circulating concentrations of amino acids that are metabolized by the liver were elevated in TCDD-treated animals. TCDD administration also resulted in an increase in total hepatic protein concentration which was evident at 4 days and increased progressively at 6 and 8 days post-treatment. Liver content of phospholipids also increased gradually following administration of TCDD.(ABSTRACT TRUNCATED AT 400 WORDS)
journal_name
Toxicol Appl Pharmacoljournal_title
Toxicology and applied pharmacologyauthors
Christian BJ,Menahan LA,Peterson REdoi
10.1016/0041-008x(86)90313-3subject
Has Abstractpub_date
1986-04-01 00:00:00pages
360-78issue
2eissn
0041-008Xissn
1096-0333pii
0041-008X(86)90313-3journal_volume
83pub_type
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2009.05.028
更新日期:2009-09-15 00:00:00
abstract::Nonmelanoma skin cancer is the most common cancer among humans and solar UV radiation, particularly its UVB component (290-320 nm), is its major cause. One way to reduce the occurrence of the cancer is via the use of substances (often antioxidants) termed "photochemopreventive agents". Resveratrol (trans-3,4',5-trihyd...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(87)90242-0
更新日期:1987-03-15 00:00:00
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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journal_title:Toxicology and applied pharmacology
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更新日期:2012-08-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1996.0092
更新日期:1996-05-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:1989-03-15 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:2007-09-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1995.1158
更新日期:1995-08-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1994.1087
更新日期:1994-05-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2003.11.016
更新日期:2004-04-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/j.taap.2008.09.008
更新日期:2008-12-15 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/s0041-008x(03)00086-3
更新日期:2003-06-15 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:2006-12-15 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:1983-10-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1006/taap.1993.1167
更新日期:1993-09-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:1999-06-15 00:00:00
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:2002-05-15 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:1992-09-01 00:00:00
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journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
doi:10.1016/0041-008x(83)90292-2
更新日期:1983-05-01 00:00:00
abstract::A total of 52 monkeys (Macaca fascicularis) were dosed orally with vehicle or 1.5 mg/kg/day of lead on one of four dosing regimens (13 monkeys/group): Group 1, vehicle only; Group 2, dosed with lead from birth onward; Group 3, dosed with lead from birth to 400 days of age and vehicle thereafter; Group 4, dosed with ve...
journal_title:Toxicology and applied pharmacology
pub_type: 杂志文章
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更新日期:1990-11-01 00:00:00