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DNA chip analysis of comprehensive food function: Inhibition of angiogenesis and telomerase activity with unsaturated vitamin E, tocotrienol

机译:综合食品功能的DNA芯片分析:抑制血管生成和端粒酶活性与不饱和维生素E,Tocotrienol

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Inhibition of angiogenesis and telomerase activity with vitamin E compounds, especially for tocotrienol (T3), has been investigated. Nutrigenomic tools have been used for elucidating the bioactive mechanisms of T3. In the cell culture experiments, T3reduced the vascular endothelial growth factor (VEGF)-stimulated tube formation by human umbilical vein endothelial cells (HUVEC). Among T3 isomers, 5—T3 appeared the highest activity. The T3 inhibited the new blood vessels formation on the growing chick embryo chorioallantoic membrane (CAM assay for an in vivo model of angiogenesis). In contrast, tocopherol did not. The findings suggested that the T3 has potential use for reducing angiogenic disorder. DNA chip analysis revealed that T3 specifically down-regulates the expression of VEGF receptor (VEGFR) in endothelial cells. It is well-known that VEGF regulates angiogenesis by binding to VEGFR. Therefore, T3 could block the intracellular signaling of VEGF via down-regulation of VEGFR, which resulted in the inhibition of angiogenesis. On the other hand, DNA chip analysis also revealed that T3 down-regulates the expression of protein kinase C (PKC) in the cultured HUVEC. Since PKC is involved with the control of telomerase activity, T3 has potential toact as anti-telomerase inhibitor via PKC inhibition. In this manner, DNA chip technology provides efficient access to genetic information regarding food function and its mechanism.
机译:已经研究了抑制血管生成和端粒酶活性的维生素E化合物,特别是用于Tocotrienol(T3)。营养素组织用于阐明T3的生物活性机制。在细胞培养实验中,T3通过人脐静脉内皮细胞(HUVEC)的血管内皮生长因子(VEGF)刺激的管形成。在T3异构体中,5-T3出现了最高的活性。 T3抑制了在生长的小鸡胚荚膜囊膜膜上形成的新血管(用于血管生成的体内模型的凸轮测定)。相比之下,生育酚没有。研究结果表明,T3具有降低血管生成病症的潜在用途。 DNA芯片分析显示,T3具体下调VEGF受体(VEGFR)在内皮细胞中的表达。众所周知,VEGF通过与VEGFR结合来调节血管生成。因此,T3可以通过VEGFR的下调阻断VEGF的细胞内信号传导,从而导致血管生成的抑制。另一方面,DNA芯片分析还显示T3下调蛋白激酶C(PKC)在培养的HUVEC中的表达。由于PKC参与了端粒酶活性的控制,因此T3通过PKC抑制具有作为抗端粒酶抑制剂的潜力。以这种方式,DNA芯片技术提供了有关食物功能及其机制的遗传信息的有效访问。

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