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• W2124274911 abstract "LRP16 is a novel gene cloned from lymphocytic cells, and its function is not known. The expression level of LRP16 mRNA was up-regulated by estrogen in breast cancer MCF-7 cells based on the computed aided serial analysis of gene expression (SAGE) analysis. In this study, we investigate the effect of 17beta-estradiol (17beta-E(2)) on the expression of LRP16 mRNA and the effects of overexpression of LRP16 on the proliferation of cultured MCF-7 cells and the possible mechanisms involved. The expression level of LRP16 mRNA induced by 17beta-E(2) was determined by Northern blot analysis. LRP16 promoter-controlled luciferase expression vector (pGL3-S(0)) was co-transfected with various nuclear receptors, including estrogen receptor alpha and beta (ERalpha and ERbeta), glucocorticoid receptor alpha (GRalpha), androgen receptor (AR) and peroxisome-proliferator activated receptor gamma and alpha (PPARgamma and PPARgamma) into COS-7 cells, and the relative luciferase activity was measured using Dual-luciferase report assay systems. The effect of overexpression of LRP16 on MCF-7 proliferation was examined by the Trypan Blue exclusion method, and the cell cycle was analyzed by flow cytometry. The expression levels of cyclin E, p53 and p21(WAF1/CIP1) proteins were determined by Western blot analysis. The results showed (1) 17beta-E(2) induced a five- to eightfold increase in LRP16 mRNA levels in MCF-7 cells; (2) the relative luciferase activities in the COS-7 cells co-transfected by pGL3-S(0) and ERalpha or AR were 7.8-fold and 11-fold respectively of those in the control cells transfected by pGL3-S(0) alone; (3) overexpression of LRP16 stimulated MCF-7 cell proliferation, and the numbers of cells in the S-phase of the cell cycle in cells transfected with LRP16 increased about 10% compared with the control cells; and (4) cyclin E levels were much higher in cells with overexpression of LRP16 than in the control cells, while the expression levels of p53 and p21(WAF1/CIP1) were not different between the two groups of cells. From these results we concluded that estrogen up-regulates the expression level of LRP16 mRNA through activation of ERalpha and that overexpression of LRP16 promotes MCF-7 cell proliferation probably by increasing cyclin E." @default.
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• W2124274911 date "2003-06-01" @default.
• W2124274911 modified "2023-10-16" @default.
• W2124274911 title "Up-regulation of LRP16 mRNA by 17beta-estradiol through activation of estrogen receptor alpha (ERalpha), but not ERbeta, and promotion of human breast cancer MCF-7 cell proliferation: a preliminary report." @default.
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• W2124274911 doi "https://doi.org/10.1677/erc.0.0100217" @default.
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