Sci Trans Med:重磅级发现!特殊血管或能增强抗肿瘤免疫疗法的效力

2017-04-18 生物谷 生物谷

近日,来自Flanders生物技术研究所等多个机构的研究人员通过研究表明,抗血管生成疗法能够帮助改善免疫增强疗法,而将这两种疗法相结合或能促进特殊血管生长,并且运输抗癌免疫细胞进入肿瘤发挥抵御癌症的作用,从而就能够使得疗法变得更加有效同时患者的生存期更长。相关研究刊登于国际杂志Sc

图片摘自:immunotherapy-news.com

近日,来自Flanders生物技术研究所等多个机构的研究人员通过研究表明,抗血管生成疗法能够帮助改善免疫增强疗法,而将这两种疗法相结合或能促进特殊血管生长,并且运输抗癌免疫细胞进入肿瘤发挥抵御癌症的作用,从而就能够使得疗法变得更加有效同时患者的生存期更长。相关研究刊登于国际杂志Science Translational Medicine上。

持续性的血管发生和免疫系统的抑制是癌症发生的标志,越来越多的证据表明,这两种活动是相关的,抑制肿瘤血管生长的疗法通常在临床上用来抵御艾恒,但其仅能有效治疗很少一类癌症患者;近来研究者在很多临床试验中利用免疫检查点调节子抑制剂能够成功刺激机体免疫系统,比如抵御程序性细胞死亡蛋白1(PD-1)或其配体的抗体等。然而仅有一小部分接受治疗的患者对这些免疫疗法产生了反应,这就强调研究人员需要鉴别出能够增加癌症患者对疗法反应率的新型策略。研究者认为,抗PD-1疗法能够致敏并且延长抗血管生成疗法的效率,相反,抗血管生成疗法也能够改善PD-L1疗法的效率。

血管能够帮助调节免疫力

为了避免被宿主的免疫系统靶向作用,肿瘤会通过操控免疫和血管系统的多个特性来维持免疫抑制的环境,增加血液供给并且降低免疫活性对于恶性细胞增殖也是非常重要的;研究者Gabriele Bergers表示,血管自身的网络是免疫力的重要调节子,因为其能够控制白细胞的“交通枢纽”,通过预防白细胞的渗入,癌症就会躲避机体宿主的免疫系统。

一种违反直觉的结果

更有意思的是,研究者发现,在小鼠模型的治疗中,将抗血管生成及免疫刺激疗法相结合,就能够通过向癌症组织中输送白细胞来促进较好的治疗效果。Elizabeth Allen博士说道,我们非常感兴趣能够观察到这种现象,将免疫系统激活和抗血管生成的抗体相结合就能够产生一种正反馈回路,结果就是特殊血管的生长能够促进抗癌免疫细胞进入到肿瘤中,在诸如淋巴结的淋巴器官中存在高水平的内皮微静脉(HEVs),其能够帮助运输白细胞,这项研究中研究者也首次发现,HEVs的生长在肿瘤中也能够产生治疗性的诱导作用。

描述过程

本文研究结果表明,两种疗法能够刺激胰腺和乳腺肿瘤中HEVs的明显生长,从而导致恶性细胞死亡以及肿瘤萎缩,下一步研究者将会去调查肿瘤内HEVs形成和维持的分子机制。最后研究者Gabriele Bergers博士表示,理解上述过程背后发生的分子机制或能帮助我们开发新型治疗性手段来增强抵御肿瘤的免疫反应。

原始出处:

Elizabeth Allen, Arnaud Jabouille, Lee B. Rivera, et al. Combined antiangiogenic and anti–PD-L1 therapy stimulates tumor immunity through HEV formation. Science Translational Medicine  12 Apr 2017,DOI: 10.1126/scitranslmed.aak9679.

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    2017-08-15 bsmagic9140
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    2017-04-24 Anyway

    学习了

    0

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