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Molecular Endocrinology 15 (2): 228-240
Copyright © 2001 by The Endocrine Society

Cooperative Effects of STAT5 (Signal Transducer and Activator of Transcription 5) and C/EBP ß (CCAAT/Enhancer-Binding Protein-ß) on ß-Casein Gene Transcription Are Mediated by the Glucocorticoid Receptor

Shannon L. Wyszomierski and Jeffrey M. Rosen

Department of Molecular and Cellular Biology Baylor College of Medicine Houston, Texas 77030-3498

ß-Casein gene transcription is controlled primarily by a composite response element (CoRE) that integrates signaling from the lactogenic hormones, PRL, insulin, and hydrocortisone, in mammary epithelial cells. This CoRE contains binding sites for STAT5 (signal transducer and activator of transcription 5) and C/EBPß (CCAAT/enhancer-binding protein-ß) and several half-sites for glucocorticoid receptor (GR). To examine how interactions among these three transcription factors might regulate ß-casein gene transcription, a COS cell reconstitution system was employed. Cooperative transactivation was observed when all three factors were expressed, but unexpectedly was not seen between STAT5 and C/EBPß in the absence of full-length, transcriptionally active GR. Cooperativity required the amino-terminal transactivation domain of C/EBPß, and neither C/EBP{alpha} nor C/EBP{delta} was able to substitute for C/EBPß when cotransfected with STAT5 and GR. Different GR determinants were needed for transcriptional cooperation between STAT5 and GR as compared with those required for all three transcription factors. These studies provide some new insights into the mechanisms responsible for high level, tissue-specific expression conferred by the ß-casein CoRE.




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