Nat Commun:阻断血管生成素的肿瘤治疗为何效果不一?

2015-02-03 佚名 生物谷

芬兰赫尔辛基大学(University of Helsinki)的科学家们最近表示他们或找到通过阻断肿瘤血管生成的肿瘤治疗有时候会失败的原因。这个观点发表在Nature Reviews Drug Discovery杂志,而相关的研究论文发表在Nature Communications上。 血管生成素阻断治疗是通过阻断肿瘤血管生长而杀死肿瘤细胞的一种疗法。这种治疗,目前广泛应用在卵巢癌等癌症的

芬兰赫尔辛基大学(University of Helsinki)的科学家们最近表示他们或找到通过阻断肿瘤血管生成的肿瘤治疗有时候会失败的原因。这个观点发表在Nature Reviews Drug Discovery杂志,而相关的研究论文发表在Nature Communications上。

血管生成素阻断治疗是通过阻断肿瘤血管生长而杀死肿瘤细胞的一种疗法。这种治疗,目前广泛应用在卵巢癌等癌症的临床试验中。尽管早期试验有一些很有效的成果,但是仍然有部分试验不能按预期提高肿瘤患者的生存率。

血管生成素阻断治疗的主要工作原理是阻断几个与血管生成相关的细胞通路。这些通路都包含几种重要调节蛋白--血管生成素-1,血管生成素-2和另外一个名为Tie-2的蛋白。血管生成素经由血管内皮Tie受体酪氨酸激酶维持血管稳态。血管生成素-1 通过激活Tie2的维持内皮稳定。血管生成素-2依赖Tie2,促进病理性血管生成,血管渗透性和炎症。阐明血管生成素-2相关的血管破坏原理一直是设计肿瘤血管生成素拮抗剂合理性的关键。可是研究小组发现机体里存在其他不需要激活Tie-2的血管生成通路。

研究发现在细胞和老鼠体内,有另外一种血管生成素-2调节的通路。当Tie-2被沉默时,血管生成素-2促进beta1-整合素,调节血管内皮含钙黏着蛋白细胞之间的链接。Tie-2被沉默带来的影响,由于beta1-整合素的激活而都消除。而最重要的是,这个通路因为不需要Tie-2,所以是不能被当前临床应用的血管生成素抑制剂阻断的。这个发现或能解释为何有些临床试验中阻滞剂的治疗效果大打折扣。研究小组负责人Saharinen博士表示因为这个发现是在正常细胞,所以还需要更多的研究来证实是否肿瘤细胞也存在这种通路。真正弄清楚机体内发生了什么,才能更好的制定新的能阻断这种通路的办法。

至少这个发现,能解答为何临床试验中血管生成素阻断剂治疗癌症效果不一。

原始出处

Hakanpaa L1, Sipila T1, Leppanen VM2, Gautam P1, Nurmi H2, Jacquemet G3, Eklund L4, Ivaska J3, Alitalo K2, Saharinen P1.Endothelial destabilization by angiopoietin-2 via integrin β1 activation.Nat Commun. 2015 Jan 30

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    2015-03-09 liuli5079
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    2015-05-19 liye789132251
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    2015-02-03 223.104.5.**

    不同肿瘤确实不同

    0

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