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Open Access Green as soon as Postprint is submitted to ZB.
Effect of thyroid hormones on liver microsomal enzyme induction in rats exposed to 2,3,7,8,-tetra-chlorodibenzo-p-dioxin.
Toxicology 37, 51-63 (1985)
The effect of thyroidectomy and thyroid hormone replacement therapy on liver microsomal enzyme induction was studied in 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-treated rats (100 μg/kg). Treatment of non-thyroidectomized rats with TCDD had no effect on the concentration of liver microsomal cytochrome b5. In contrast, cytochrome b5 content was increased by TCDD treatment of thyroidectomized rats, regardless of replacement therapy with either T3 or T4. TCDD treatment increased the concentration of cytochrome P-450 (2-3-fold) and the activities of benzo[a]pyrene hydroxylase (4-7-fold), ethoxyresorufin O-de-ethylase (50-70-fold) and UDP-glucuronosyltransferase (5-7-fold) in non-thyroidectomized and thyroidectomized as well as thyroidectomized thyroid hormone treated rats; indicating the induction of these liver microsomal enzyme activities is independent of thyroid status. Because thyroid status alters the toxicity of TCDD but does not alter the ability of TCDD to induce microsomal enzymes, it appears that TCDD toxicity may not be directly related to microsomal enzyme induction.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
2,3,7,8-tetrachlorodibenzo-p-dioxin ; Microsomal Enzyme Induction ; Thyroid Hormones
ISSN (print) / ISBN
0300-483X
e-ISSN
0300-483X
Journal
Toxicology
Quellenangaben
Volume: 37,
Issue: 1-2,
Pages: 51-63
Publisher
Elsevier
Non-patent literature
Publications
Reviewing status
Peer reviewed