共查询到20条相似文献,搜索用时 234 毫秒
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Lee JH Park CH Jung KC Rhee HS Yang CH 《Biochemical and biophysical research communications》2005,335(3):771-776
Functional activation of beta-catenin/Tcf signaling plays an important role in early events in carcinogenesis. We examined the effect of naringenin against beta-catenin/Tcf signaling in gastric cancer cells. Reporter gene assay showed that naringenin inhibited beta-catenin/Tcf signaling efficiently. In addition, the inhibition of beta-catenin/Tcf signaling by naringenin in HEK293 cells transiently transfected with constitutively mutant beta-catenin gene, whose product is not phosphorylated by GSK3beta, indicates that its inhibitory mechanism was related to beta-catenin itself or downstream components. To investigate the precise inhibitory mechanism, we performed immunofluorescence, Western blot, and EMSA. As a result, our data revealed that the beta-catenin distribution and the levels of nuclear beta-catenin and Tcf-4 proteins were unchanged after naringenin treatment. Moreover, the binding activities of Tcf complexes to consensus DNA were not affected by naringenin. Taken together, these data suggest that naringenin inhibits beta-catenin/Tcf signaling in gastric cancer with unknown mechanisms. 相似文献
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Hirota M Watanabe K Hamada S Sun Y Strizzi L Mancino M Nagaoka T Gonzales M Seno M Bianco C Salomon DS 《Cellular signalling》2008,20(9):1632-1641
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Vitamin D(3) promotes the differentiation of colon carcinoma cells by the induction of E-cadherin and the inhibition of beta-catenin signaling 总被引:13,自引:0,他引:13 下载免费PDF全文
Pálmer HG González-Sancho JM Espada J Berciano MT Puig I Baulida J Quintanilla M Cano A de Herreros AG Lafarga M Muñoz A 《The Journal of cell biology》2001,154(2):369-387
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Wang X Adhikari N Li Q Hall JL 《American journal of physiology. Heart and circulatory physiology》2004,287(6):H2376-H2383
Initial studies have established expression of low-density lipoprotein (LDL) receptor-related protein 6 (LRP6) in vascular smooth muscle cells (VSMCs). We hypothesized that LRP6 is a critical mediator governing the regulation of the canonical Wnt/beta-catenin/T cell factor 4 (Tcf-4) cascade in the vasculature. This hypothesis was based on our previous work demonstrating a role for the beta-catenin/Tcf-4 pathway in vascular remodeling as well as work in other cell systems establishing a role for LRP family members in the Wnt cascade. In line with our hypothesis, LRP6 upregulation significantly increased Wnt-1-induced Tcf activation. Moreover, a dominant interfering LRP6 mutant lacking the carboxyl intracellular domain (LRP6DeltaC) abolished Tcf activity. LRP6-induced stimulation of Tcf was blocked in VSMCs harboring constitutive expression of a dominant negative Tcf-4 transgene lacking the beta-catenin binding domain, suggesting that LRP6-induced activation of Tcf was mediated through a beta-catenin-dependent signal. Expression of the dominant interfering LRP6DeltaC transgene was sufficient to abolish the Wnt-induced survival as well as cyclin D1 activity and cell cycle progression. In conclusion, these findings provide the first evidence of a role for an LDL receptor-related protein in the regulation of VSMC proliferation and survival through the evolutionary conserved Wnt signaling cascade. 相似文献
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