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| TISSUE-SPECIFIC AND HORMONALLY CONTROLLED ALTERNATIVE PROMOTERS REGULATE AROMATASE CYTOCHROME-P450 GENE-EXPRESSION IN HUMAN ADIPOSE-TISSUE |
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| Author(s): MAHENDROO MS, MENDELSON CR, SIMPSON ER |
| Source: JOURNAL OF BIOLOGICAL CHEMISTRY Volume: 268 Issue: 26 Pages: 19463-19470 Published: SEP 15 1993 |
| Times Cited: 225 References: 46 |
| Abstract: Estrogen biosynthesis is catalyzed by a microsomal enzyme, aromatase cytochrome P450 (P450arom; the product of the CYP19 gene). The human CYP19 gene comprises nine coding exons, II-X. Additionally, tissue-specific expression is determined by the use of tissue-specific promoters, which give rise to P450arom transcripts with unique 5'-noncoding sequences. In placenta, P450arom transcripts contain one of two 5'-untranslated exons, I.1 or I.2, while ovarian transcripts instead contain sequence consistent with the use of a promoter, PII, which is proximal to the start of translation. To characterize transcripts present in adipose tissue and adipose stromal cells (ASC) in culture, cDNA libraries were constructed by the RACE (rapid amplification of cDNA ends) procedure. Four P450arom transcripts with unique 5' termini were identified, leading to the characterization of two unique 5'-untranslated exons of the CYP19 gene, I.3 and I.4. Whereas I.3-specific sequence is expressed in adipose tissue as well as in ACS maintained under all culture conditions, I.4-specific sequence is apparently present only in breast adipose tissue, and ACS stimulated with glucocorticoids. On the other hand, PII-specific sequence is present only in cells stimulated with cAMP analogues and is absent from cells stimulated with glucocorticoids. We conclude that CYP19 gene expression in human adipose tissue likely utilizes two novel promoters and, furthermore, that alternative promoter usage in cultured ASC is a function of the hormonal environment in which the cells are maintained. |
| Document Type: Article |
| Language: English |
Addresses:
1. UNIV TEXAS, SW MED CTR, CECIL H & IDA GREEN CTR REPROD BIOL SCI, DALLAS, TX 75235 USA
2. UNIV TEXAS, SW MED CTR, DEPT OBSTET GYNECOL, DALLAS, TX 75235 USA
3. UNIV TEXAS, SW MED CTR, DEPT BIOCHEM, DALLAS, TX 75235 USA |
| Publisher: AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 |
| Subject Category: Biochemistry & Molecular Biology |
| IDS Number: LW819 |
| ISSN: 0021-9258 |
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