Targeting cross-presentation as a route to improve the efficiency of peptide-based cancer vaccines

Ben Wylie, Ferrer Ong, Hanane Belhoul-Fakir, Kristin Priebatsch, Heique Bogdawa, Anja Stirnweiss, Paul Watt, Paula Cunningham, Shane R. Stone, Jason Waithman

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Cross-presenting dendritic cells (DC) offer an attractive target for vaccination due to their unique ability to process exogenous antigens for presentation on MHC class I molecules. Recent reports have established that these DC express unique surface receptors and play a critical role in the initiation of anti-tumor immunity, opening the way for the development of vaccination strategies specifically targeting these cells. This study investigated whether targeting cross-presenting DC by two complementary mechanisms could improve vaccine effectiveness, in both a viral setting and in a murine melanoma model. Our novel vaccine construct contained the XCL1 ligand, to target uptake to XCR1+ cross-presenting DC, and a cell penetrating peptide (CPP) with endosomal escape properties, to enhance antigen delivery into the cross-presentation pathway. Using a prime-boost regimen, we demonstrated robust expansion of antigen-specific T cells following vaccination with our CPP-linked peptide vaccine and protective immunity against HSV-1 skin infection, where vaccine epitopes were natively expressed by the virus. Additionally, our novel vaccination strategy slowed tumor outgrowth in a B16 murine melanoma model, compared to adjuvant only controls, suggesting antigen-specific anti-tumor immunity was generated following vaccination. These findings suggest that novel strategies to target the antigen cross-presentation pathway in DC may be beneficial for the generation of anti-tumor immunity.

Original languageEnglish
Article number6189
JournalCancers
Volume13
Issue number24
DOIs
Publication statusPublished - 1 Dec 2021

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