4.8 Article

Sequentially pH-Responsive Drug-Delivery Nanosystem for Tumor Immunogenic Cell Death and Cooperating with Immune Checkpoint Blockade for Efficient Cancer Chemoimmunotherapy

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 37, 页码 43963-43974

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c10643

关键词

sequentially pH-responsive; doxorubicin; immunogenic cell death; immune checkpoint blockade; cancer chemoimmunotherapy

资金

  1. National Natural Science Foundation of China [81973671, 82102883]
  2. Natural Science Foundation of Shandong Province [ZR2019BEM003]

向作者/读者索取更多资源

The sequentially pH-responsive DOX delivery nanosystem designed for simultaneous chemotherapy and tumor immunogenic cell death holds great potential for cancer chemoimmunotherapy, by utilizing immune checkpoint blockade to enhance antitumor activity.
Chemoimmunotherapy has anchored a new blueprint for cancer management. As a burgeoning approach, immunotherapy has shifted the paradigm of traditional chemotherapy and opened up new prospects for cancer treatment. Here, a sequentially pH-responsive doxorubicin (DOX) delivery nanosystem is designed for simultaneous chemotherapy and tumor immunogenic cell death (ICD). DOX is modified into pH-sensitive cis-aconityl-doxorubicin (CAD) for being easily adsorbed by polycationic polyethylenimine (PEI), and the PEI/CAD complexes are in situ-shielded by aldehyde-modified polyethylene glycol (PEG). The PEG/PEI/CAD nanoparticles (NPs) can keep stable in neutral physiological pH during systemic circulation but will detach PEG shielding once in slightly acidic tumor extracellular pH. The exposed positive PEI/CAD complexes are endocytosed effortlessly, and CAD is then converted back to DOX by endosomal-acidity-triggered cis-aconityl cleavage. The released DOX further elicits ICD, and the moribund tumor cells will release antigens and damage-associated molecular patterns to recruit dendritic cells and activate antitumor immunity. An excellent therapeutic effect is achieved when the immune checkpoint PD-1 antibody (aPD-1) is utilized to cooperate with the PEG/PEI/CAD NPs for blocking tumor immune escape and maintaining antitumor activity of the ICD-instigated T cells. The sequentially pH-responsive DOX delivery nanosystem cooperating with immune checkpoint blockade will provide a potential strategy for cancer chemoimmunotherapy.

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