Glycan-Modified Melanoma-Derived Apoptotic Extracellular Vesicles as Antigen Source for Anti-Tumor Vaccination

Tumors that lack T cell infiltration are less likely to respond to immune checkpoint inhibition and could benefit from cancer vaccination for the initiation of anti-tumor T cell responses. An attractive vaccine strategy is in vivo targeting of dendritic cells (DCs), key initiators of antigen-specifi...

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Bibliographic Details
Published in:Cancers Vol. 11; no. 9
Main Authors: Horrevorts, Sophie K, Stolk, Dorian A, Ven, Rieneke van de, Hulst, Myrthe, Hof, Bert van Het, Duinkerken, Sanne, Heineke, Marieke H, Ma, Wenbin, Dusoswa, Sophie A, Nieuwland, Rienk, Garcia-Vallejo, Juan J, Loosdrecht, Arjan A van de, de Gruijl, Tanja D, Vliet, Sandra J van, van Kooyk, Yvette
Format: Journal Article
Language:English
Published: Switzerland 01.09.2019
Subjects:
T cell priming
cancer vaccine
glycan modification
dendritic cell
apoptotic extracellular vesicles
C-type lectin
ISSN:2072-6694, 2072-6694
Online Access:Get full text
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Summary:Tumors that lack T cell infiltration are less likely to respond to immune checkpoint inhibition and could benefit from cancer vaccination for the initiation of anti-tumor T cell responses. An attractive vaccine strategy is in vivo targeting of dendritic cells (DCs), key initiators of antigen-specific T cell responses. In this study we generated tumor-derived apoptotic extracellular vesicles (ApoEVs), which are potentially an abundant source of tumor-specific neo-antigens and other tumor-associated antigens (TAAs), and which can be manipulated to express DC-targeting ligands for efficient antigen delivery. Our data demonstrates that by specifically modifying the glycocalyx of tumor cells, high-mannose glycans can be expressed on their cell surface and on extracellular vesicles derived after the induction of apoptosis. High-mannose glycans are the natural ligands of dendritic cell-specific intercellular adhesion molecule-3-grabbing non-integrin (DC-SIGN), a dendritic cell associated C-type lectin receptor (CLR), which has the ability to efficiently internalize its cargo and direct it to both major histocompatibility complex (MHC)-I and MHC-II pathways for the induction of CD8 and CD4 T cell responses, respectively. Compared to unmodified ApoEVs, ApoEVs carrying DC-SIGN ligands are internalized to a higher extent, resulting in enhanced priming of tumor-specific CD8 T cells. This approach thus presents a promising vaccination strategy in support of T cell-based immunotherapy of cancer.
ISSN:2072-6694
2072-6694
DOI:10.3390/cancers11091266