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PLoS One:天然药物补骨脂素能定向攻击HER2阳性乳腺癌细胞

2014-03-02 MedSci MedSci原创

近日,Duke大学研究人员报告称:一种常见的已知能对抗淋巴癌和皮肤疾病的化合物也能对某些恶性程度的乳房肿瘤有潜在治疗作用。该化合物被称为补骨脂素,是在无花果以及芹菜中发现的天然组分,研究人员早已了解,它的工作原理是通过破坏DNA的复制和引起的细胞死亡,但其发挥功效需要获得一个能量源,例如紫外光激活补骨脂素后才能使其发挥作用。现在杜克大学的研究人员已经确定了化合物杀死肿瘤细胞的另一种方式,这便于发展


近日,Duke大学研究人员报告称:一种常见的已知能对抗淋巴癌和皮肤疾病的化合物也能对某些恶性程度的乳房肿瘤有潜在治疗作用。该化合物被称为补骨脂素,是在无花果以及芹菜中发现的天然组分,研究人员早已了解,它的工作原理是通过破坏DNA的复制和引起的细胞死亡,但其发挥功效需要获得一个能量源,例如紫外光激活补骨脂素后才能使其发挥作用。

现在杜克大学的研究人员已经确定了化合物杀死肿瘤细胞的另一种方式,这便于发展补骨脂素为一种有效的癌症治疗药物。相关研究论文发表在2014年2月14日的PLOS ONE期刊上,研究人员详细汇报了补骨脂素如何阻断HER2受体,HER2受体是在乳腺癌、卵巢癌胃癌等实体瘤过多表达的信号通路。
当HER2生产过剩,它促使细胞生长失控,导致癌症更具侵略性。在实验中,补骨脂素关闭HER2过表达乳腺癌细胞系的该过程。Neil L. Spector医学博士说:这是非常意外的,虽然已经知道补骨脂素通过引起DNA损伤来杀死癌细胞,但它对HER2过度表达乳腺癌细胞的直接抗肿瘤作用通
过阻断HER2信号来实现的。

补骨脂素还攻击另一种形式的HER2,即存在于肿瘤细胞细胞核中的HER2。这种形式的HER2蛋白是癌细胞抗癌症疗法的主要原因之一。当HER2受体处于细胞的外部,癌症药物能够识别HER2受体,但药物不能识别的细胞核内的HER2受体,Spector说:我们已经表明,补骨脂素能有效地瞄准这个形式的HER2,改善耐药性。

原始出处:

Xia W, Gooden D, Liu L, Zhao S, Soderblom EJ, Toone EJ, Beyer WF Jr, Walder H, Spector NL.Photo-Activated Psoralen Binds the ErbB2 Catalytic Kinase Domain, Blocking ErbB2 Signaling and Triggering Tumor Cell Apoptosis.PLoS One. 2014 Feb 14;9(2):e88983.

相关文献:
Wu C, Sun Z, Ye Y, Han X, Song X, Liu S.Psoralen inhibits bone metastasis of breast cancer in mice.Fitoterapia. 2013 Dec;91:205-10.

Xin D, Wang H, Yang J, Su YF, Fan GW, Wang YF, Zhu Y, Gao XM.Phytoestrogens from Psoralea corylifolia reveal estrogen receptor-subtype selectivity.Phytomedicine. 2010 Feb;17(2):126-31

小知识:
ErbB2(又名ErbB2, NEU, CD340)是原癌基因erbB-2编码的185kDa的细胞膜受体,为表皮生长因子受体(epidermalgrowthfactorreceptor,EGFR)家族 成员之一。该家族包括ErbB-1(又称EGFR,HER1)、ErbB2(又称HER2)、ErbB-3(HER3)和ErbB-4(HER4)四个成员。


ErbB2高表达肿瘤细胞中Ras-MAPK和PI3K-Akt信号传导活性较高,细胞增殖能力较强,分化成熟和凋亡机制受到抑制,细胞恶性程度高。

ErbB2高表达肿瘤细胞可抵抗TNF-α、射线以及各种化疗药物引起的细胞凋亡效应。
临床上ErbB2表达与患者预后密切相关,ErbB2高表达的患者易发生肿瘤转移,存活期短。由于ErbB2在正常 细胞和肿瘤细胞中的表达水平具有显著的差异,因而已成为肿瘤免疫生物治疗的理想靶点,亦是目前肿瘤治疗研究领域的热点分子。Herstatin是近年来发 现的唯一天然存在的ErbB2自身抑制分子,它是ErbB2mRNA加工过程中选择性剪接的产物,是一种可溶性的ErbB2受体。

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    2014-04-29 liao1632
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    2014-03-05 guolihui123

    补骨脂素对机体正常细胞细胞的独立研究应该进一步研究

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    2014-03-04 yxch36
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