化学免疫疗法
吲哚胺2,3-双加氧酶
免疫原性细胞死亡
免疫系统
免疫抑制
癌症研究
肿瘤微环境
CD8型
免疫疗法
T细胞
医学
免疫学
生物
生物化学
氨基酸
色氨酸
作者
Xiangru Feng,Weiguo Xu,Jianhua Liu,Di Li,Gao Li,Jianxun Ding,Xuesi Chen
标识
DOI:10.1016/j.scib.2020.07.013
摘要
Many conventional chemotherapeutics play an immune-modulating effect by inducing immunogenic cell death (ICD) in tumor cells. However, they hardly arouse strong antitumor immune response because the immunosuppressive lymphocytes are present in the tumor microenvironment. These immunosuppressive lymphocytes include regulatory T cells (Tregs) and myeloid-derived suppressor cells (MDSCs). We used a low dose of doxorubicin (DOX) to induce ICD in combination with immune regulator 1-methyl-DL-tryptophan (1MT) to suppress indoleamine 2,3-dioxygenase and overcome Treg- and MDSC-associated immune suppression. By co-encapsulation of DOX and 1MT into a reduction-responsive polypeptide nanogel, the drugs were simultaneously released in the tumor cells and synergistically performed antitumor efficacy. After treatment, recruitment of Tregs and MDSCs was inhibited, and the frequency of tumor-infiltrating CD8+ T cells was remarkably enhanced. These results demonstrated that the chemoimmunotherapy strategy effectively suppressed tumor growth without causing evident adverse effects, indicating its great potential in clinical cancer therapy.
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