Words similar to sertoli
Example sentences for: sertoli
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For each reaction, 5 × 10 3cpm of labeled probe was incubated with 5 μg of crude nuclear proteins from Sertoli cells and 1.0 μg of poly dI:dC in a buffer containing 5 mM Hepes pH 7.9, 26 % glycerol, 0.2 mM EDTA, 0.5 mM DTT, 0.5 mM PMSF, 150 mM KCl and 5 mM MgCl at room temperature for 15 min.
, [ 10 12 13 14 15 ] ]. It is thought to regulate spermatogenesis and sperm maturation by maintaining high androgen levels in the testis and epididymis [ 16 17 ] and has been proposed as a biochemical marker for Sertoli cell function and formation of blood-testis barrier [ 12 18 ] . More recently, cell surface receptors for ABP and its liver-derived homolog sex hormone-binding globulin (SHBG) were identified in several androgen target tissues, suggesting that these extracellular steroid-binding proteins may have a much broader, hormone-like function [ 19 20 21 ] .
The promoters of several genes induced by FSH in Sertoli cells and granulosa cells, including c-Fos, transferrin, follicle stimulating hormone receptor, SF-1 genes and the RIIβ gene, contain functional E-box elements [ 21 22 23 24 ] . We found that several USF complexes containing full-length USF1 and USF2 as well as truncated versions, are formed at the consensus E-box/HLH-binding element in the RIIβ promoter in Sertoli cell nuclear extracts.
For USF1, we observed that a new immunoreactive protein of about 31 kDa was formed only in nuclear extracts from cAMP-stimulated Sertoli cells (Fig.
C/EBP is previously reported to be an important accessory factor for transactivation by several other transcription factors [ 26 ] . C/EBPβ was shown to transactivate the α1-acid glycoprotein gene promoter even when mutated in the DNA-binding domain, and this activation appeared to depend on protein-protein interaction with glucocorticoid receptor through the leucine zipper region [ 27 ] . Recently, a conserved domain in C/EBPα and C/EBPβ was shown to mediate cAMP responsiveness, strengthening the fact that C/EBP may be characterized as a cAMP-responsive nuclear regulator [ 28 29 ] . On the COX-2 promoter in granulosa cells, cAMP-mediated regulation was shown to be mediated primarily by an E-box that bind USF1 and USF2 isoforms in a manner resembling the RIIβ E-box in Sertoli cells [ 30 ] . Transactivation of the COX-2 gene in skin carcinoma cells is highly dependent on this E-box together with a C/EBP binding site that bind C/EBPβ and C/EBPδ [ 31 ] . These data strengthens a model of formation of a cAMP-responsive unit (CRU) containing USF and C/EBP.
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