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This version published online on May 6, 2004
Molecular Endocrinology, doi:10.1210/me.2004-0028
Molecular Endocrinology Vol. 0, No. 2004 200400281-
doi:10.1210/me.2004-0028
Copyright © 2004 by the Endocrine Society.
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Submitted on January 23, 2004
Accepted on April 27, 2004

TEF-5 and a GATA-Like Protein Determine Placental-Specific Expression of the Type I Human 3{beta}-Hydroxysteroid Dehydrogenase Gene, HSD3B1

Lihong Peng, Yong Huang, Fan Jin, Shi-Wen Jiang, and Anita H. Payne*

Division of Reproductive Biology, Department of Obstetrics and Gynecology, Stanford University School of Medicine, Stanford, California, 94305; Department of Obstetrics and Gynecology, Mayo Clinic, Rochester, Minnesota, 55905

* To whom correspondence should be addressed. E-mail: anita.payne{at}stanford.edu.

The enzyme 3{beta}hydroxysteroid dehydrogenase/isomerase (3{beta}HSD) is required for the biosynthesis of all active steroid hormones. It exists as multiple isoforms in humans and rodents, each a product of a distinct gene. Two isoforms, 3{beta}HSD I and II, are expressed in a tissue-specific manner in humans. 3{beta}HSD I is the only isoform expressed in the placenta where it is required for the biosynthesis of progesterone and thus essential for the maintenance of pregnancy. We recently identified two transcription factors, AP-2{gamma} and Dlx-3, that are expressed in both human and mouse trophoblast cells which were shown to be required for trophoblast-specific expression of the orthologous murine 3{beta}HSD, 3{beta}HSD VI. Although we identified specific binding sites for AP-2{gamma} and Dlx-3 in the distal promoter of the human 3{beta}HSD I gene, HSD3B1, it was found that these transcription factors were not involved in determining placental-specific expression of human 3{beta}HSD I. Instead, a 53-bp placental-specific enhancer element located between -2570 and -2518 of the HSD3B1 promoter was identified. Within this 53-bp element two potential placental transcription factor binding sites were found. Electrophoretic mobility shift assays with a 20-bp oligonucleotide containing these two potential placental-specific binding sites identified one of the binding sites specific for the transcription enhancer factor-5 (TEF-5) which is highly expressed in human placenta and in placental choriocarcinoma derived JEG-3 cells and the other overlapping binding site, specific for a GATA-like protein. Site-specific mutations in either the TEF-5 binding site or in the GATA binding site, each resulted in complete loss of enhancer activity. The data indicate that TEF-5 and the GATA-like protein act in a coordinate manner to determine the placental-specific expression of the human 3{beta}HSD I enzyme and therefore are critical for placental progesterone production required for the maintenance of pregnancy.
Key words: Placenta • human 3{beta}HSD • TEF-5 • GATA




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