Journal Article

Temporal- and dose-dependent hepatic gene expression changes in immature ovariectomized mice following exposure to ethynyl estradiol

D. R. Boverhof, K. C. Fertuck, L. D. Burgoon, J. E. Eckel, C. Gennings and T. R. Zacharewski

in Carcinogenesis

Volume 25, issue 7, pages 1277-1291
Published in print July 2004 | ISSN: 0143-3334
Published online July 2004 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/bgh114
Temporal- and dose-dependent hepatic gene expression changes in immature ovariectomized mice following exposure to ethynyl estradiol

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Temporal- and dose-dependent changes in hepatic gene expression were examined in immature ovariectomized C57BL/6 mice gavaged with ethynyl estradiol (EE), an orally active estrogen. For temporal analysis, mice were gavaged every 24 h for 3 days with 100 µg/kg EE or vehicle and liver samples were collected at 2, 4, 8, 12, 24 and 72 h. Gene expression was monitored using custom cDNA microarrays containing 3067 genes/ESTs of which 393 exhibited a change at one or more time points. Functional gene annotation extracted from public databases associated temporal gene expression changes with growth and proliferation, cytoskeletal and extracellular matrix responses, microtubule-based processes, oxidative metabolism and stress, and lipid metabolism and transport. In the dose–response study, hepatic samples were collected 24 h following treatment with 0, 0.1, 1, 10, 100 or 250 µg/kg EE. Thirty-nine of the 79 genes identified as differentially regulated at 24 h in the time course study exhibited a dose–response relationship with an average ED50 value of 47 ± 3.5 µg/kg. Comparative analysis indicated that many of the identified temporal and dose-dependent hepatic responses are similar to EE-induced uterine responses reported in the literature and in a companion study using the same animals. Results from these studies confirm that the liver is a highly estrogen responsive tissue that exhibits a number of common responses shared with the uterus as well as distinct estrogen-mediated profiles. These data will further aid in the elucidation of the mechanisms of action of estrogens in the liver as well as in other classical and non-classical estrogen responsive tissues.

Keywords: Apoe, apolipoprotein E; Ct, threshold cycle; ECM, extracellular matrix; EE, ethynyl estradiol; ER, estrogen receptor; QRT-PCR, quantitative real-time PCR

Journal Article.  10213 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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