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针对病种:结肠癌

发表时间:2012年7月

发表国家:美国

登载刊物:公共科学图书馆一

研究单位:美国伊利诺伊大学厄巴纳-尚佩恩分校食品科学和人类营养学院

研究人员:王焕,李倩,陈宏

主要结论:金雀异黄素 (GEN) 是一种植物衍生的异黄酮,可通过抑制 WNT 信号通路阻断结肠癌组织失控的细胞生长。减少结肠癌细胞的生长和增殖.

Plos One, 2012, 7(7):398-398.

Genistein Affects Histone Modifications on Dickkopf-Related Protein 1 (DKK1) Gene in SW480 Human Colon Cancer Cell Line

Huan Wang, Qian Li, Hong Chen

Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America

Genistein (GEN) is a plant-derived isoflavone and can block uncontrolled cell growth in colon cancer by inhibiting the WNT signaling pathway. This study aimed to test the hypothesis that the enhanced gene expression of the WNT signaling pathway antagonist, DKK1 by genistein treatment is associated with epigenetic modifications of the gene in colon cancer cells. Genistein treatment induced a concentration-dependent G2 phase arrest in the human colon cancer cell line SW480 and reduced cell proliferation. Results from several other human colon cancer cell lines confirmed the growth inhibitory effects of genistein. Overexpression of DKK1 confirmed its involvement in growth inhibition. Knockdown of DKK1 expression by siRNA slightly induced cell growth. DKK1 gene expression was increased by genistein in SW480 and HCT15 cells. DNA methylation at the DKK1 promoter was not affected by genistein treatment in all the cell lines tested. On the other hand, genistein induced histone H3 acetylation of the DKK1 promoter region in SW480 and HCT15 cells. This indicates that increased histone acetylation is associated with the genistein-induced DKK1 expression. The association between histone acetylation and DKK1 gene expression is confirmed by the histone deacetylase inhibitor trichostatin A (TSA) treatment. In conclusion, genistein treatment decreases cell growth and proliferation in colon cancer cell lines. The effect is associated with the increased DKK1 expression through the induction of histone acetylation at the DKK1 promoter region.


美国《公共科学图书馆一》,
20127

在人体结肠癌细胞SW480中金雀异黄素影响组蛋白对上调相关蛋白 1 (DKK1) 基因的修饰

王焕,李倩,陈宏

美国伊利诺伊大学厄巴纳-尚佩恩分校食品科学和人类营养学院

金雀异黄素 GEN 是一种植物衍生的异黄酮,可通过抑制 WNT 信号通路阻断结肠癌组织失控的细胞生长。本研究旨在测试在结肠癌细胞中染料木黄酮处理的WNT 信号通路拮抗剂 DKK1 增强的基因表达与表观遗传修饰基因有关的假说。在人体结肠腺癌细胞SW480中金雀异黄素治疗诱导了浓度依赖性 G2 期阻滞,减少细胞增殖。从其他几种人体结肠癌细胞得到的结果证实了金雀异黄素的生长抑制作用。DKK1 的过表达证实其参与了生长抑制作用。siRNA 阻碍的DKK1 表达略微诱导了细胞的生长。在细胞 SW480 HCT15中染料木黄酮增加了DKK1 基因的表达。在 DKK1 启动子的DNA 甲基化在所有测试细胞中没有受到染料木黄酮治疗的影响。另一方面,在SW480 HCT15 细胞中染料木黄酮诱导DKK1 启动子区域的组蛋白 H3 乙酰化。这表明,增强的组蛋白乙酰化与金雀异黄素诱导的 DKK1 表达相关联。组蛋白乙酰化和 DKK1 基因表达之间的关联被组蛋白去乙酰化酶抑制剂曲古霉素A (TSA) 治疗证实。总之,染料木黄酮治疗可减少结肠癌细胞的生长和增殖。通过诱导DKK1 启动子区域组蛋白的乙酰化增加DKK1 的表达与这种影响相关。
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