A novel mechanism of natural vitamin E tocotrienol activity: involvement of ERbeta signal transduction.

A novel mechanism of natural vitamin E tocotrienol activity: involvement of ERbeta signal transduction.
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天然维生素 E 生育三烯酚活性的新机制:ERbeta 信号转导的参与。

DOI:
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发表时间:
2009
期刊:
American Journal of Physiology. Endocrinology and Metabolism
影响因子:
--
通讯作者:
F. Virgili
F. Virgili
中科院分区:
--
文献类型:
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作者:
Raffaella Comitato;K. Nesaretnam;G. Leoni;R. Ambra;R. Canali;A. Bolli;M. Marino;F. Virgili

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维生素E是用于表示所有生育酚(TOC)和生育三烯酚(TT)衍生物的通用术语。在过去的几年里,一些论文已经表明,从棕榈油中提取的富含TT的部分(TTRF)抑制增殖并诱导大量癌细胞凋亡。然而,涉及TT作用的分子机制仍不清楚。在本研究中,我们首次提出了一个新的机制TT活动,涉及雌激素受体(ER)信号。计算机模拟和体外结合分析表明,TT对ER β具有高亲和力,但对ER α没有亲和力。此外,在含有ER β的MDA-MB-231乳腺癌细胞中,我们证明了TT增加了ER β向细胞核的易位,这反过来激活了雌激素应答基因(MIC-1,EGR-1和组织蛋白酶D),正如ER抑制剂ICI-182,780预孵育细胞所证明的那样。最后,我们观察到TT处理与细胞形态学改变、DNA片段化和半胱天冬酶-3活化相关。总之,这些实验阐明了γ-和δ-TT效应的分子机制。
Vitamin E is a generic term used to indicate all tocopherol (TOC) and tocotrienol (TT) derivates. In the last few years, several papers have shown that a TT-rich fraction (TTRF) extracted from palm oil inhibits proliferation and induces apoptosis in a large number of cancer cells. However, the molecular mechanism(s) involved in TT action is still unclear. In the present study, we proposed for the first time a novel mechanism for TT activity that involves estrogen receptor (ER) signaling. In silico simulations and in vitro binding analyses indicated a high affinity of TTs for ERbeta but not for ERalpha. In addition, in ERbeta-containing MDA-MB-231 breast cancer cells, we demonstrated that TTs increase the ERbeta translocation into the nucleus, which in turn activates estrogen-responsive genes (MIC-1, EGR-1 and cathepsin D), as demonstrated by cell preincubation with the ER inhibitor ICI-182,780. Finally, we observed that TT treatment is associated with alteration of cell morphology, DNA fragmentation, and caspase-3 activation. Altogether, these experiments elucidated the molecular mechanism underling gamma- and delta-TT effects.
牛胎儿子宫细胞中的雌激素反应涉及由雌激素反应元件和激活蛋白-1 共同指导的途径。
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