Surface-Functionalized Modified Copper Sulfide Nanoparticles Enhance Checkpoint Blockade Tumor Immunotherapy by Photothermal Therapy and Antigen Capturing

Ruoping Wang, Zhesheng He, Pengju Cai, Yao Zhao, Liang Gao, Wenzhi Yang, Yuliang Zhao, Xueyun Gao, Fuping Gao

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Nanomaterial-based tumor photothermal therapy (PTT) has attracted increasing attention and been a promising method for cancer treatment because of its low level of adverse effects and noninvasiveness. However, thermotherapy alone still cannot control tumor metastasis and recurrence. Here, we developed surface-functionalized modified copper sulfide nanoparticles (CuS NPs). CuS NPs can not only be used as photothermal mediators for tumor hyperthermia but can adsorb tumor antigens released during hyperthermia as an antigen-capturing agent to induce antitumor immune response. We selected maleimide polyethylene glycol-modified CuS NPs (CuS NPs-PEG-Mal) with stronger antigen adsorption capacity, in combination with an immune checkpoint blocker (anti-PD-L1) to evaluate the effect of hyperthermia, improving immunotherapy in a 4T1 breast cancer tumor model. The results showed that hyperthermia based on CuS NPs-PEG-Mal distinctly increased the levels of inflammatory cytokines in the serum, leading to a tumor immunogenic microenvironment. In cooperation with anti-PD-L1, PTT mediated by CuS NPs-PEG-Mal enhanced the number of tumor-infiltrating CD8 + T cells and inhibited the growth in primary and distant tumor sites of the 4T1 tumor model. The therapeutic strategies provide a simple and effective treatment option for metastatic and recurrent tumors.

Original languageEnglish (US)
Pages (from-to)13964-13972
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number15
DOIs
StatePublished - Apr 17 2019

Keywords

  • CuS NPs
  • anti-PD-L1
  • antigen-capturing agent
  • checkpoint-blockade
  • immune response
  • photothermal therapy

ASJC Scopus subject areas

  • Materials Science(all)

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