For reporter assays, sub-confluent cultures of WT276 cells (in 6-well plates) were transfected with the indicated reporter plasmids (either ERE-luc or ISRE-luc; 1.8 µg plasmid DNA) and a second reporter plasmid pRL-TK (0.2 µg;), as an internal control to normalize the transfections efficiency, using the FuGENE 6 transfection reagent (Roche, Indianapolis, IN), as suggested by the supplier.
The reconfirmation of some of these early phase transcripts by RT-PCR indicates that BPA and HPTE are able to regulate uterine transcripts through a mechanism that requires ERα and can use either direct ERE binding or tethered interaction with target genes.
The observed interaction between ERE-associated SNPs and either the ESR1 SNP or the ER status of the tumor also provides evidence for the breast tumorigenic relevance of these ERE-associated SNPs.
As a result of ligand binding these receptors bind to specific DNA sequences, either ERE 3 or androgen response element, in their target genes, and recruit transcription factors, resulting in hormone-stimulated transcription (Fig. 2a).
Hela cells were transiently cotransfected with a luciferase reporter driven by the estrogen response element (ERE), ERα expression vector, and either Vav3 or Vav3* expression vector.
Reflecting the high degree of similarity in their DBDs, both receptors interact with the same conserved estrogen response element (ERE) (5'-GGTCAnnnTGACC-3') as either homodimers or α/β heterodimers [ 9- 11].
Reflecting the high degree of similarity in their DBDs, both receptors interact with the same conserved estrogen response element (ERE) (5'-GGTCAnnnTGACC-3') as either homodimers or alpha/beta heterodimers [ 8, 9].
To evaluate the relative involvement of ERα and ERβ in mediating the actions of Rg1, ER-negative human embryonic kidney (HEK293) cells were co-transfected with the ERE-luciferase reporter construct and either ERα or ERβ construct.
Since both ICI and MPP suppressed prl expression, we next questioned whether either compound suppresses ERE-mediated transcriptional activity.
We also demonstrated D3 was able to up-regulate Cdkn1a both in WT and KI/KO, which implied that D3 is able to exert estrogenic activity through either classical or ERE-independent mechanisms in vivo.
