Egr-1 is activated by 17beta-estradiol in MCF-7 cells by mitogen-activated protein kinase-dependent phosphorylation of ELK-1

Early growth response-1 (Egr-1) is an immediate-early gene induced by E2 in the rodent uterus and breast cancer cells. E2 induces Egr-1 mRNA and protein levels in MCF-7 human breast cancer cells and reporter gene activity in cells transfected with pEgr-1A, a construct containing the -600 to +12 region of the Egr-1 promoter linked to the firefly luciferase gene. Deletion analysis of the Egr-1 promoter identified a minimal E2-responsive region of the promoter that contained serum response element (SRE)3 (-376 to -350) which bound Elk-1 and serum response factor (SRF) in gel mobility shift assays. Hormone-responsiveness of Egr-1 in MCF-7 cells was specifically inhibited by PD98059, a mitogen-activated protein kinase kinase inhibitor, but not by LY294002, an inhibitor of phosphatidylinositol-3-kinase (PI3-K). These results contrasted with hormone-dependent activation of the SRE in the c-fos promoter, which was inhibited by both PD98059 and LY294002. Differences in activation of the SREs in Egr-1 and c-fos were related to promoter sequence, which defines the affinities of Elk-1 and SRF to their respective binding sites. Thus, Egr-1, like c-fos, is activated through non-genomic (extranuclear) pathways of estrogen action in breast cancer cells.     

PTHrP expression in chick sternal chondrocytes is regulated by TGF-beta through Smad-mediated signaling

PTHrP regulates the rate of chondrocyte differentiation during endochondral bone formation. The expression of PTHrP and its regulation by TGF-beta, BMP-2, and PTHrP was examined in upper sternal chondrocytes following 1, 3, and 5 days of continuous treatment. While TGF-beta stimulated the expression of PTHrP (5-fold), PTHrP caused a slight inhibition, and BMP-2 markedly inhibited PTHrP mRNA expression. The effect of these factors on PTHrP expression was not simply related to the maturational state of the cells, since BMP-2 increased, while both PTHrP and TGF-beta decreased the expression of type X collagen. TGF-beta isoforms 1, 2, and 3 all stimulated PTHrP expression. Signaling events involved in the induction of PTHrP by TGF-beta were further evaluated in a PTHrP-promoter CAT construct. The effect of TGF-beta, BMP-2, and PTHrP on the PTHrP-promoter paralleled their effects on mRNA expression, with TGF-beta significantly increasing CAT activity, BMP-2 decreasing CAT activity, and PTHrP having a minimal effect. Co-transfection of the TGF-beta signaling molecule, Smad 3, mimicked the effect of TGF-beta (induction of PTHrP promoter), while dominant negative Smad 3 inhibited the induction of the PTHrP promoter by TGF-beta. Furthermore, infection with a Smad 3-expressing retrovirus mimicked the effects of exogenously added TGF-beta, and induced PTHrP mRNA expression in the infected chondrocyte culture. In contrast, a dominant negative Smad 3 completely inhibited PTHrP promoter stimulation by TGF-beta, but only partially blocked the effect of TGF-beta on PTHrP mRNA synthesis. These findings demonstrate that PTHrP is expressed in chondrocytes undergoing endochondral ossification, and show regulation, at least in part, by TGF-beta through Smad mediated signaling events.     

V-sis induces Egr-1 expression by a pathway mediated by c-Ha-ras

The early growth response gene, Egr-1, is up-regulated transiently by mitogens and many other simuli in all cells tested. Using NIH3T3 cells conditionally expressing v-sis from a metallothionein promoter, we show that the addition of Zn²⁺ stimulates the production of PDGF-B(v-sis) and elicits the expression of Egr-1 in a dose-dependent and time-regulated manner. The signal is likely independent of protein kinase C, but depends on tyrosine kinase and other kinase activities and is mediated by c-Ha-Ras since the presence of dominant-negative mutants of Ras and Raf abrogates the induction of Egr-1 expression by Zn²⁺. Transiently activated Ras expression in NIH3T3 cells also stimulates the transient expression of Egr-1, but cells that constitutively express Rass do not have elevated levels of Egr-1. Transient assays also demonstrated that Zn²⁺ or activated Ras expression stimulated the activity of a 950 bp Egr-1 promoter-reporter gene construct and this is abrogated in the presence of mutant Ras and Raf. The accumulated data show that Egr-1 gene expression is regulated by multiple mechanisms, as would be needed for putative role in Cell proliferation, in suppression of transformation and in differentiation.     

Upstream stimulatory factor (USF) proteins induce human TGF-beta1 gene activation via the glucose-response element-1013/-1002 in mesangial cells: up-regulation of USF activity by the hexosamine biosynthetic pathway

The hyperglycemia-enhanced flux through the hexosamine biosynthetic pathway (HBP) has been implicated in the up-regulated gene expression of transforming growth factor-beta1 (TGF-beta1) in mesangial cells, thus leading to mesangial matrix expansion and diabetic glomerulosclerosis. Since the -1013 to -1002 region of the TGF-beta1 promoter shows high homology to glucose-response elements (GlRE) formerly described in genes involved in glucose metabolism, we studied the function of the GlRE in the high glucose-induced TGF-beta1 gene activation in mesangial cells. We found that high glucose concentrations enhanced the nuclear amount of upstream stimulatory factors (USF) and their binding to this sequence. Fusion of the GlRE to the thymidine kinase promoter resulted in glucose responsiveness of this promoter construct. Overexpression of either USF-1 or USF-2 increased TGF-beta1 promoter activity 2-fold, which was prevented by mutation or deletion of the GlRE. The high glucose-induced activation of the GlRE is mediated by the HBP; increased flux through the HBP induced by high glucose concentrations, by glutamine, or by overexpression of the rate-limiting enzyme glutamine:fructose-6-phosphate aminotransferase (GFAT) particularly activated USF-2 expression. GFAT-overexpressing cells showed higher USF binding activity to the GlRE and enhanced promoter activation via the GlRE. Increasing O-GlcNAc modification of proteins by streptozotocin, thereby mimicking HBP activation, also resulted in increased mRNA and nuclear protein levels of USF-2, leading to enhanced DNA binding activity to the GlRE. USF proteins themselves were not found to be O-GlcNAc-modified. Thus, we have provided evidence for a new molecular mechanism linking high glucose-enhanced HBP activity with increased nuclear USF protein levels and DNA binding activity and with up-regulated TGF-beta1 promoter activity.     

Activation of luteinizing hormone beta gene by gonadotropin-releasing hormone requires the synergy of early growth response-1 and steroidogenic factor-1.

We have previously shown that early growth response (Egr) 1-deficient mice exhibit female infertility, reflecting a luteinizing hormone (LH) beta deficiency. Egr-1 activates the LHbeta gene in vitro through synergy with steroidogenic factor-1 (SF-1), a protein required for gonadotrope function. To test if this synergy is essential for gonadotropin-releasing hormone (GnRH) stimulation of LHbeta, we examined the activity of the LHbeta promoter in the gonadotrope cell line LbetaT2. GnRH markedly stimulated the LHbeta promoter (15-fold). Mutation of either Egr-1 or SF-1 elements within the LHbeta promoter attenuated this stimulation, whereas mutation of both promoter elements abrogated GnRH induction of the LHbeta promoter. Furthermore, GnRH stimulated Egr-1 but not SF-1 expression in LbetaT2 cells. Importantly, overexpression of Egr-1 alone was sufficient to enhance LHbeta expression. Although other Egr proteins are expressed in LbetaT2 cells and are capable of interacting with SF-1, GnRH stimulation of Egr-1 was the most robust. We also found that the nuclear receptor DAX-1, a repressor of SF-1 activity, reduced Egr-1-SF-1 synergy and diminished GnRH stimulation of the LHbeta promoter. We conclude that the synergy between Egr-1 and SF-1 is essential for GnRH stimulation of the LHbeta gene and plays a central role in the dynamic regulation of LHbeta expression.