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Estrogen can stimulate an ERE-driven gene to promote DNA synthesis.(estrogen response element)
2003 MAR 6 - (NewsRx.com & NewsRx.net) -- "Estrogen 17beta-estradiol (E2) rapidly modulates several signaling pathways related to cell growth, preservation, and differentiation. The physiological role of these nongenomic effects with regard to downstream outcomes, and the relationship with transcriptional estrogen activity are unclear. Furthermore, the ability of selective estrogen receptor modulators (SERMs) to trigger nongenomic actions is largely unknown," researchers in the United States report.
"To determine whether estrogen receptor (ER) ligands exert nongenomic activity in endometrial adenocarcinoma cells, and whether this activity affects transcription and DNA synthesis, we challenged human Ishikawa cells with E2 or partial ER agonists 4-hydroxytamoxifen (OHT) and raloxifene (ral). Serum starved Ishikawa cells exposed for 5 min to 0.1 nm E2 showed induced phosphorylation of MAPK (ERK1/2). Ral and 4-OHT each at 1 nM also stimulated ERK in a rapid transient manner. E2 and 4-OHT induced proto-oncogene c-fos mRNA expression in Ishikawa cells within 30 min, but ral had no effect.
"In contrast to nongenomic action, only E2 stimulated expression of an estrogen response element (ERE)-driven luciferase (LUC) reporter gene. To examine DNA synthesis, [H[superscript]3]thymidine incorporation was measured in serum starved cultures exposed to E2 or partial agonists for 2 d. E2 at 1 nM stimulated ...
- Estrogen can stimulate an ERE-driven gene to promote DNA synthesis.
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- Estrogen can stimulate an ERE-driven gene to promote DNA synthesis.(estrogen...
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...although cyclin D3 stimulated less DNA synthesis than D1 or D2. Accordingly, the three...Mullany and colleagues (see also Cell Biology). The researchers concluded: "Further...Oncology, DNA, Gastroenterology, Cell Biology. This article was prepared by Life...
Source: HighBeam Research, Estrogen can stimulate an ERE-driven gene to promote DNA...