Combination of epigenetic regulation with gene therapy-mediated immune checkpoint blockade induces anti-tumour effects and immune response in vivo.

Combination of epigenetic regulation with gene therapy-mediated immune checkpoint blockade induces anti-tumour effects and immune response in vivo.
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表观遗传调控与基因治疗介导的免疫检查点阻断相结合可诱导体内抗肿瘤作用和免疫反应

DOI:
10.1038/s41467-021-27078-x
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发表时间:
2021-11-18
影响因子:
16.6
通讯作者:
Chen X
Chen X
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Fang H;Guo Z;Chen J;Lin L;Hu Y;Li Y;Tian H;Chen X

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免疫疗法已成为一种强大的癌症治疗方法,但由于免疫逃逸机制,只有一小部分患者获得了持久的益处。在这项研究中,表观遗传调节与基因治疗介导的免疫检查点阻断相结合,以缓解这种免疫逃逸机制。mPEG-b-PLG/PEI-RT 3/DNA)被开发用于通过引入多种相互作用(即,静电、氢键和疏水相互作用)和聚脯氨酸II(PPII)-螺旋构象,其下调肿瘤细胞上的PD-L1表达以缓解T细胞的免疫抑制。Zebularine(缩写为Zeb)是一种DNA甲基转移酶抑制剂(DNMTi),用于肿瘤免疫微环境的表观遗传调节,从而诱导DC成熟和MHC I分子表达以增强抗原呈递。PPD加Zeb联合治疗启动全身抗肿瘤免疫应答,并通过产生持久的免疫记忆有效预防肿瘤复发和转移。这一策略为肿瘤治疗和抑制复发和转移提供了方案。
Immunotherapy has become a powerful cancer treatment, but only a small fraction of patients have achieved durable benefits due to the immune escape mechanism. In this study, epigenetic regulation is combined with gene therapy-mediated immune checkpoint blockade to relieve this immune escape mechanism.PPD(i.e., mPEG-b-PLG/PEI-RT3/DNA) is developed to mediate plasmid-encoding shPD-L1 delivery by introducing multiple interactions (i.e., electrostatic, hydrogen bonding, and hydrophobic interactions) and polyproline II (PPII)-helix conformation, which downregulates PD-L1 expression on tumour cells to relieve the immunosuppression of T cells. Zebularine (abbreviated as Zeb), a DNA methyltransferase inhibitor (DNMTi), is used for the epigenetic regulation of the tumour immune microenvironment, thus inducing DC maturation and MHC I molecule expression to enhance antigen presentation. PPD plus Zeb combination therapy initiates a systemic anti-tumour immune response and effectively prevents tumour relapse and metastasis by generating durable immune memory. This strategy provides a scheme for tumour treatment and the inhibition of relapse and metastasis.
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