Cell:地西他滨帮助免疫疗法突破瓶颈,把癌细胞“赶尽杀绝”

2017-06-28 Heather_z727 来宝网

圣裘德儿童医院免疫学家们发现了免疫细胞T细胞如何变得“筋疲力尽”,无法完成抵御外部细菌,癌细胞以及病毒侵入工作的原理,这一发现很重要,因为免疫疗法有时对癌症患者无反应,或者癌症易复发,这可能都是T细胞疲劳造成的结果。在此次研究中,科学家们发现,已经在使用的化疗药物可以扭转T细胞的疲劳。



研究人员帮助免疫细胞恢复体力,对抗癌症和感染】圣裘德儿童医院免疫学家们发现了免疫细胞T细胞如何变得“筋疲力尽”,无法完成抵御外部细菌,癌细胞以及病毒侵入工作的原理,这一发现很重要,因为免疫疗法有时对癌症患者无反应,或者癌症易复发,这可能都是T细胞疲劳造成的结果。在此次研究中,科学家们发现,已经在使用的化疗药物可以扭转T细胞的疲劳。

这一发现为发展和壮大免疫疗法提供了全新的途径,研究报告发表于近期的《细胞》杂志上,在报道中,研究人员详细解释了解释免疫疗法失败的原因。

研究人员表示:“发现T细胞衰竭的临床意义是巨大的,因为癌症的治疗动辄就需要几个月,而在此之前,T细胞已经和肿瘤细胞进行了多番对决,因此,许多患者免疫治疗失败的原因就在于他们的T细胞已经耗尽了所有的气力。”

临床前研究中,研究人员探索着引起T细胞疲劳的病毒感染和肿瘤的机制,他们发现罪魁祸首是一个所谓的“表观遗传程序”,它压抑着T细胞对肿瘤抗原的能力。表观遗传控制着分子的开关,在他们的实验中,研究人员发现疲惫的感觉传给了一代又一代的T细胞。具体地说,他们发现表观遗传程序参与了DNA甲基化的过程。

而最值得庆幸的是,研究人员发现已有的化疗药物decitabine可以增强T细胞的属性,Decitabine可以阻止表观遗传的DNA甲基化开关,从而使T细胞恢复活力,重整旗鼓对抗癌症

原始出处:

Hazem E. Ghoneim, Yiping Fan, Ardiana Moustaki, et al, De Novo Epigenetic Programs Inhibit PD-1 Blockade-Mediated T Cell Rejuvenation. Cell (2017). DOI: 10.1016/j.cell.2017.06.007

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    2021-08-22 病毒猎手

    #肿瘤免疫治疗# #地西他滨#比较有前途,它本身抗肿瘤作用很弱,但是却可以增强免疫治疗,未来可能成为万能药物

    0

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    2021-08-22 病毒猎手

    #地西他宾#可能本身不一定抗肿瘤,但是却大大增强了#肿瘤免疫#治疗

    0

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    2017-07-29 维他命
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    2017-06-30 日月生辉

    这发现十分重要,一改以前以为化疗会降低抵抗力,学习了

    0

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    2017-06-29 yxch36
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    2017-06-28 ylzr123

    认真学习,不断进步,把经验分享给同好。点赞了!

    0

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