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Department of Cell Biology and Biochemistry (A.J.R., S.C.W.,
D.M.S.) and Southwest Cancer Center (S.C.W.) Texas Tech
University Health Science Center Lubbock, Texas 79430
Department of Biochemistry University of Louisville School of
Medicine (B.J.C) Louisville, Kentucky 40292
The steroidogenic acute regulatory (StAR) protein mediates the rate-limiting step of steroidogenesis, which is the transfer of cholesterol to the inner mitochondrial membrane. In steroidogenic tissues, StAR expression is acutely regulated by trophic hormones through a cAMP second messenger pathway, leading to increased StAR mRNA levels within 30 min, reaching maximal levels after 46 h of stimulation. The molecular mechanisms underlying such regulation remain unknown. We have examined the StAR promoter for putative transcription factor-binding sites that may regulate transcription in a developmental and/or hormone-induced context. Through sequence analysis, deoxyribonuclease I (DNAse I) footprinting and electrophoretic mobility shift assays (EMSAs), we have identified two putative CCAAT/enhancer binding protein (C/EBP) DNA elements at -113 (C1) and -87 (C2) in the mouse StAR promoter. Characterization of these sites by EMSA indicated that C/EBPß bound with high affinity to C1 and C2 was a low-affinity C/EBP site. Functional analysis of these sites in the murine StAR promoter showed that mutation of one or both of these binding sites decreases both basal and (Bu)2cAMP-stimulated StAR promoter activity in MA-10 Leydig tumor cells, without affecting the fold activation [(Bu)2cAMP-stimulated/basal] of the promoter. Furthermore, we have demonstrated that these two C/EBP binding sites are required for steroidogenic factor-1 (SF-1)-dependent transactivation of the StAR promoter in a nonsteroidogenic cell line. These data indicate that in addition to SF-1, C/EBPß is involved in the transcriptional regulation of the StAR gene and may play an important role in developmental and hormone-responsive regulation of steroidogenesis.
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H. Pincas, K. Amoyel, R. Counis, and J.-N. Laverrière Proximal cis-Acting Elements, Including Steroidogenic Factor 1, Mediate the Efficiency of a Distal Enhancer in the Promoter of the Rat Gonadotropin-Releasing Hormone Receptor Gene Mol. Endocrinol., February 1, 2001; 15(2): 319 - 337. [Abstract] [Full Text] |
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P. R. Manna, J. Kero, M. Tena-Sempere, P. Pakarinen, D. M. Stocco, and I. T. Huhtaniemi Assessment of Mechanisms of Thyroid Hormone Action in Mouse Leydig Cells: Regulation of the Steroidogenic Acute Regulatory Protein, Steroidogenesis, and Luteinizing Hormone Receptor Function Endocrinology, January 1, 2001; 142(1): 319 - 331. [Abstract] [Full Text] [PDF] |
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N. Sekar, H. A. LaVoie, and J. D. Veldhuis Concerted Regulation of Steroidogenic Acute Regulatory Gene Expression by Luteinizing Hormone and Insulin (or Insulin-Like Growth Factor I) in Primary Cultures of Porcine Granulosa-Luteal Cells Endocrinology, November 1, 2000; 141(11): 3983 - 3992. [Abstract] [Full Text] [PDF] |
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T. Sugawara, M. Saito, and S. Fujimoto Sp1 and SF-1 Interact and Cooperate in the Regulation of Human Steroidogenic Acute Regulatory Protein Gene Expression Endocrinology, August 1, 2000; 141(8): 2895 - 2903. [Abstract] [Full Text] [PDF] |
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C. Le Roy, J. Y. Li, D. M. Stocco, D. Langlois, and J. M. Saez Regulation by Adrenocorticotropin (ACTH), Angiotensin II, Transforming Growth Factor-{beta}, and Insulin-Like Growth Factor I of Bovine Adrenal Cell Steroidogenic Capacity and Expression of ACTH Receptor, Steroidogenic Acute Regulatory Protein, Cytochrome P450c17, and 3{beta}-Hydroxysteroid Dehydrogenase Endocrinology, May 1, 2000; 141(5): 1599 - 1607. [Abstract] [Full Text] [PDF] |
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C. R. Wooton-Kee and B. J. Clark Steroidogenic Factor-1 Influences Protein-Deoxyribonucleic Acid Interactions within the Cyclic Adenosine 3',5'-Monophosphate-Responsive Regions of the Murine Steroidogenic Acute Regulatory Protein Gene Endocrinology, April 1, 2000; 141(4): 1345 - 1355. [Abstract] [Full Text] [PDF] |
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B. J. Clark and R. Combs Angiotensin II and Cyclic Adenosine 3',5'-Monophosphate Induce Human Steroidogenic Acute Regulatory Protein Transcription through a Common Steroidogenic Factor-1 Element Endocrinology, October 1, 1999; 140(10): 4390 - 4398. [Abstract] [Full Text] |
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L. K. Christenson, P. F. Johnson, J. M. McAllister, and J. F. Strauss III CCAAT/Enhancer-binding Proteins Regulate Expression of the Human Steroidogenic Acute Regulatory Protein (StAR) Gene J. Biol. Chem., September 10, 1999; 274(37): 26591 - 26598. [Abstract] [Full Text] [PDF] |
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M. E. Reyland, R. M. Evans, and E. K. White Lipoproteins Regulate Expression of the Steroidogenic Acute Regulatory Protein (StAR) in Mouse Adrenocortical Cells J. Biol. Chem., November 17, 2000; 275(47): 36637 - 36644. [Abstract] [Full Text] [PDF] |
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L. K. Christenson, R. L. Stouffer, and J. F. Strauss III Quantitative Analysis of the Hormone-induced Hyperacetylation of Histone H3 Associated with the Steroidogenic Acute Regulatory Protein Gene Promoter J. Biol. Chem., July 13, 2001; 276(29): 27392 - 27399. [Abstract] [Full Text] [PDF] |
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S. L. Gyles, C. J. Burns, B. J. Whitehouse, D. Sugden, P. J. Marsh, S. J. Persaud, and P. M. Jones ERKs Regulate Cyclic AMP-induced Steroid Synthesis through Transcription of the Steroidogenic Acute Regulatory (StAR) Gene J. Biol. Chem., September 7, 2001; 276(37): 34888 - 34895. [Abstract] [Full Text] [PDF] |
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