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논문 기본 정보

자료유형
학술저널
저자정보
Eo, Hyun Ji (Department of Bioresource Sciences, Andong National University) Park, Gwang Hun (Department of Bioresource Sciences, Andong National University) Jeong, Jin Boo (Department of Bioresource Sciences, Andong National University)
저널정보
한국응용약물학회 Biomolecules & Therapeutics(구 응용약물학회지) Biomolecules & therapeutics 제24권 제4호
발행연도
2016.1
수록면
380 - 386 (7page)

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Silymarin from milk thistle (Silybum marianum) has been reported to show an anti-cancer activity. In previous study, we reported that silymarin induces cyclin D1 proteasomal degradation through NF-${\kappa}B$-mediated threonine-286 phosphorylation. However, mechanism for the inhibition of Wnt signaling by silymarin still remains unanswered. Thus, we investigated whether silymarin affects Wnt signaling in human colorectal cancer cells to elucidate the additional anti-cancer mechanism of silymarin. Transient transfection with a TOP and FOP FLASH luciferase construct indicated that silymarin suppressed the transcriptional activity of ${\beta}$-catenin/TCF. Silymarin treatment resulted in a decrease of intracellular ${\beta}$-catenin protein but not mRNA. The inhibition of proteasome by MG132 and $GSK3{\beta}$ inhibition by SB216763 blocked silymarin-mediated downregulation of ${\beta}$-catenin. In addition, silymarin increased phosphorylation of ${\beta}$-catenin and a point mutation of S33Y attenuated silymarin-mediated ${\beta}$-catenin downregulation. In addition, silymarin decreased TCF4 and increased Axin expression in both protein and mRNA level. From these results, we suggest that silymarin-mediated downregulation of ${\beta}$-catenin and TCF4 may result in the inhibition of Wnt signaling in human colorectal cancer cells.

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