Journal
JOURNAL OF MOLECULAR ENDOCRINOLOGY
Volume 56, Issue 4, Pages 311-323Publisher
BIOSCIENTIFICA LTD
DOI: 10.1530/JME-15-0159
Keywords
thyroid hormone; 3,5-diiodo-l-thyronine (3,5-T-2); transcriptome analysis; drug metabolism; constitutive androstane receptor (CAR); steroid metabolism; cholesterol metabolism
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Funding
- DFG [KFO 218/2 TP3, KO 922/17-1, WA1328/5-1]
- German Ministry of Education and Research (BMBF, DZD) [01GI0922]
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The endogenous thyroid hormone (TH) metabolite 3,5-diiodo-L-thyronine (3,5-T-2) acts as a metabolically active substance affecting whole-body energy metabolism and hepatic lipid handling in a desirable manner. Considering possible adverse effects regarding thyromimetic action of 3,5-T-2 treatment in rodents, the current literature remains largely controversial. To obtain further insights into molecular mechanisms and to identify novel target genes of 3,5-T-2 in liver, we performed a microarray-based liver tissue transcriptome analysis of male lean and diet-induced obese euthyroid mice treated for 4 weeks with a dose of 2.5 mu g/g bw 3,5-T-2. Our results revealed that 3,5-T-2 modulates the expression of genes encoding Phase I and Phase II enzymes as well as Phase III transporters, which play central roles in metabolism and detoxification of xenobiotics. Additionally, 3,5-T-2 changes the expression of TH responsive genes, suggesting a thyromimetic action of 3,5-T-2 in mouse liver. Interestingly, 3,5-T-2 in obese but not in lean mice influences the expression of genes relevant for cholesterol and steroid biosynthesis, suggesting a novel role of 3,5-T-2 in steroid metabolism of obese mice. We concluded that treatment with 3,5-T-2 in lean and diet-induced obese male mice alters the expression of genes encoding hepatic xenobiotic-metabolizing enzymes that play a substantial role in catabolism and inactivation of xenobiotics and TH and are also involved in hepatic steroid and lipid metabolism. The administration of this high dose of 3,5-T-2 might exert adverse hepatic effects. Accordingly, the conceivable use of 3,5-T-2 as pharmacological hypolipidemic agent should be considered with caution.
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