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Department of Molecular and Integrative Physiology The University of Kansas Medical Center Kansas City, Kansas 66160
The FSH receptor (FSHR) is expressed only in granulosa cells of the ovary and Sertoli cells of the testis. This highly specific pattern of gene expression asserts that transcriptional events unique to these two cell types are responsible for activation of the FSHR gene. We have characterized the promoter elements required for activity of the rat FSHR gene in a Sertoli cell line MSC-1, primary cultures of rat Sertoli cells, and two non-Sertoli cell lines. Transient transfection analysis of deletion and block replacement mutants identified several elements, both 5' and 3' to the transcriptional start sites, that are essential for full promoter activity in Sertoli cells. These studies confirmed the use of an important E box element (CACGTG), which had the single greatest impact on promoter function. Bases within the core CACGTG of the E box, as well as flanking sequences, were shown to be essential for its function. Electrophoretic mobility shift assays identified both upstream stimulatory factor 1 (USF1) and USF2 as primary components of the complexes binding the E box. Sequence requirements for USF binding in vitro modestly diverged from the sequence requirements for in vivo function of the element. Comparison of the E box binding proteins in different cell types revealed that similar proteins bind the E box in Sertoli and non-Sertoli cell lines. Extracts from primary cultures of rat and mouse Sertoli cells have a second E box-binding complex that cross-reacts with USF antibodies that is not present in the cell lines.
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