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Pubmed ID :17893710
Publication Date : //

Induction of the LRP16 gene by estrogen promotes the invasive growth of Ishikawa human endometrial cancer cells through the downregulation of E-cadherin.


LRP16 was previously identified as an estrogen-induced gene in breast cancer cells. The responsiveness of LRP16 to estrogen and its functional effects in endometrial cancer (EC) cells are still unclear. Here, we show that the mRNA level and promoter activity of the LRP16 gene were significantly increased by 17beta-estradiol (E2) in estrogen receptor alpha (ER alpha)-positive Ishikawa human EC cells. Although the growth rate of Ishikawa cells was not obviously affected by ectopic expression of LRP16, the results of a Transwell assay showed an approximate one-third increase of the invasive capacity of LRP16-overexpressing cells. As a result of molecular screening, we observed that the expression of E-cadherin, an essential adhesion molecule associated with tumor metastasis, was repressed by LRP16. Further promoter analyses demonstrated that LRP16 inhibited E-cadherin transactivation in a dose-dependent manner. However, the inhibition was abolished by estrogen deprivation, indicating that the downregulation of E-cadherin transcription by LRP16 requires ER alpha mediation. Chromatin immunoprecipitation analyses revealed that the binding of ER alpha to the E-cadherin promoter was antagonized by LRP16, suggesting that LRP16 could interfere with ER alpha-mediated transcription. These results suggest that the upregulation of LRP16 by estrogen could be involved in invasive growth by downregulating E-cadherin in human ECs.

Authors : Meng Yuan Guang , Han Wei Dong , Zhao Ya Li , Huang Ke , Si Yi Ling , Wu Zhi Qiang , Mu Yi Ming ,

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