NATURE:刘志博实验室发现细胞焦亡的抗肿瘤免疫功能

2020-03-12 MedSci原创 MedSci原创

细胞焦亡诱导的炎症可以激发强大的抗肿瘤免疫,并与检查点阻断协同作用。

我们需要能够在活体动物中起作用的生物正交化学来研究各个生物学过程,比如细胞死亡和免疫等。

最近的研究已经确定了一种孔洞形成的gasdermin蛋白家族,它可以产生依赖于炎性小体和不依赖于炎性小体的细胞焦亡。细胞焦亡是一种促炎作用,但至今为止,其对抗肿瘤免疫的作用尚不清楚。

最近,研究人员建立了一个生物正交化学系统,其中癌症成像探针苯丙氨酸三氟硼酸盐(phebf3)可以进入细胞,进行脱硅并“切割”一个设计的包含硅醚的连接。

该系统可使药物从小鼠体内的抗体-药物结合物中得到控制释放。当与纳米颗粒介导的传递相结合时,phebf3催化的脱硅作用可以从纳米颗粒偶联物中释放出一种客户蛋白(包括一种活性的gasdermin),选择性地进入小鼠的肿瘤细胞。

研究人员将这一生物正交系统应用于gasdermin,结果显示少于15%的肿瘤细胞的焦亡足以清除整个4T1乳腺肿瘤移植物。免疫缺陷小鼠或T细胞耗竭时,肿瘤消退不存在,且肿瘤消退与增强的抗肿瘤免疫反应相关。低剂量无活性的纳米颗粒结合的gasdermin与phebf3一起注射,使4T1肿瘤对抗pd1治疗敏感。

因此,这个基于phebf3脱硅的生物正交系统是一种强大的化学生物学工具;研究结果表明,细胞焦亡诱导的炎症可以激发强大的抗肿瘤免疫,并与检查点阻断协同作用。

 

原始出处:

Qinyang Wang et al. A bioorthogonal system reveals antitumour immune function of pyroptosis. NATURE, 2020; 

 

 

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