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Vol. 290, Issue 2, 740-747, August 1999

Synthetic Estrogen 17alpha -Ethinyl Estradiol Induces Pattern of Uterine Gene Expression Similar to Endogenous Estrogen 17beta -Estradiol1

Salman M. Hyder, Constance Chiappetta and George M. Stancel

Department of Integrative Biology, Pharmacology, and Physiology, The University of Texas Medical School at Houston, Houston, Texas

17alpha -Ethinyl estradiol is one of most widely prescribed estrogens. We compared the effects of this synthetic estrogen to those of the endogenous ovarian hormone 17beta -estradiol on the expression of four estrogen-inducible genes in the rat uterus. The genes examined include c-fos, c-jun, vascular endothelial growth factor, and creatine kinase B, which are all known to be primary responses to estrogen administration. Both estrogens induced the four target genes with similar time courses and produced the same pattern of cell-specific expression of c-fos and vascular endothelial growth factor in the uterine epithelium and stroma, respectively. Dose-response studies established that the potency and efficacy of both estrogens in the uterus were the same for all four hormone-regulated genes. These studies suggest that 17alpha -ethinyl and 17beta -estradiol produce similar if not identical patterns of gene expression in the uterus.


0022-3565/99/2902-0740$03.00/0
THE JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS
Copyright © 1999 by The American Society for Pharmacology and Experimental Therapeutics



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