A Nanoscale Metal-Organic Framework to Mediate Photodynamic Therapy and Deliver CpG Oligodeoxynucleotides to Enhance Antigen Presentation and Cancer Immunotherapy

Angew Chem Int Ed Engl. 2020 Jan 13;59(3):1108-1112. doi: 10.1002/anie.201911429. Epub 2019 Nov 29.

Abstract

Checkpoint blockade immunotherapy (CBI) awakes a host innate immune system and reactivates cytotoxic T cells to elicit durable response in some cancer patients. Now, a cationic nanoscale metal-organic framework, W-TBP, is used to facilitate tumor antigen presentation by enabling immunogenic photodynamic therapy (PDT) and promoting the maturation of dendritic cells (DCs). Comprised of dinuclear WVI secondary building units and photosensitizing 5,10,15,20-tetra(p-benzoato)porphyrin (TBP) ligands, cationic W-TBP mediates PDT to release tumor associated antigens and delivers immunostimulatory CpG oligodeoxynucleotides to DCs. The enhanced antigen presentation synergizes with CBI to expand and reinvigorate cytotoxic T cells, leading to superb anticancer efficacy and robust abscopal effects with >97 % tumor regression in a bilateral breast cancer model.

Keywords: CpG delivery; antigen presentation; checkpoint blockade immunotherapy; metal-organic frameworks; photodynamic therapy.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Antigen Presentation / immunology*
  • Humans
  • Immunotherapy / methods*
  • Metal-Organic Frameworks / chemistry*
  • Oligodeoxyribonucleotides / chemistry*
  • Photochemotherapy / methods*

Substances

  • Metal-Organic Frameworks
  • Oligodeoxyribonucleotides