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Multifunctional Nanoparticles Boost Cancer Immunotherapy Based on Modulating the Immunosuppressive Tumor

Ji Li1, Ming Zhao2, Meng Sun2

  • 1Department of Traditional Chinese Medicine, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, P. R. China.

ACS Applied Materials & Interfaces
|October 30, 2020
PubMed

Cancer immunotherapy has been a favorable strategy for facilitating antitumor immunity. However, immune tolerance and an ultimate immunosuppressive tumor microenvironment (ITM) are primary obstacles. To achieve the goals of remodeling the ITM and promoting cancer immunotherapy, a versatile nanoparticle codelivering shikonin (SK) and PD-L1 knockdown siRNA (SK/siR-NPs) was reported. SK/siR-NPs are demonstrated to tellingly induce the immunogenic cell death (ICD) of tumor cells, leading to increased dendritic cell maturation. Moreover, SK/siR-NPs can cause an efficacious inhibition of PD-L1, leading to enhanced cytotoxic T lymphocyte response to tumor cells. Most importantly, SK/siR-NPs can restrain lactate production via the downregulation of pyruvate kinase-M2 (PKM2) and eventually repolarize tumor associated macrophages (TAMs) from the M2-subtype to M1-subtype states. Meanwhile, SK/siR-NPs suppress regulatory T lymphocytes to fight with the ITM. Overall, the developed co-delivery system presents a significant potential for cancer immunotherapy through simultaneously inducing ICD, repolarizing M2-TAMs, and relieving PD-L1 pathway-regulated immune tolerance.

Keywords:
cancer immunotherapyimmune checkpoint blockadeimmunogenic cell deathimmunosuppressive tumor microenvironmentshikonintumor associated macrophages

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