Abstract
Priming of CD8+ T cells by dendritic cells (DCs) is crucial for the generation of effective antitumor immune responses. Here, we describe a liposomal vaccine carrier that delivers tumor antigens to human CD169/Siglec-1+ antigen-presenting cells using gangliosides as targeting ligands. Ganglioside-liposomes specifically bound to CD169 and were internalized by in vitro-generated monocyte-derived DCs (moDCs) and macrophages and by ex vivo-isolated splenic macrophages in a CD169-dependent manner. In blood, high-dimensional reduction analysis revealed that ganglioside-liposomes specifically targeted CD14+ CD169+ monocytes and Axl+ CD169+ DCs. Liposomal codelivery of tumor antigen and Toll-like receptor ligand to CD169+ moDCs and Axl+ CD169+ DCs led to cytokine production and robust cross-presentation and activation of tumor antigen-specific CD8+ T cells. Finally, Axl+ CD169+ DCs were present in cancer patients and efficiently captured ganglioside-liposomes. Our findings demonstrate a nanovaccine platform targeting CD169+ DCs to drive antitumor T cell responses.
Original language | English |
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Pages (from-to) | 27528-27539 |
Number of pages | 12 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Volume | 117 |
Issue number | 44 |
DOIs | |
Publication status | Published - 3 Nov 2020 |
Keywords
- Siglec-1
- CD169
- dendritic cells
- CD8+ T cells
- vaccination
- Gangliosides
- Humans
- Immunogenicity, Vaccine
- Leukocytes, Mononuclear
- Liposomes
- Macrophages/immunology
- Neoplasms/immunology
- Primary Cell Culture
- Proto-Oncogene Proteins/metabolism
- Receptor Protein-Tyrosine Kinases/metabolism
- Sialic Acid Binding Ig-like Lectin 1/metabolism
- THP-1 Cells
- Vaccination/methods
- Vaccines, Subunit/administration & dosage