Vaccination with an adenoviral vector encoding the tumor antigen directly linked to invariant chain induces potent CD4+ T-cell-independent CD8+ T-cell-mediated tumor control

Maria Rathmann Sørensen, Peter J. Holst, Hanspeter Pircher, Jan Pravsgaard Christensen, Allan R. Thomsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Antigen-specific immunotherapy is an attractive strategy for cancer control. In the context of antiviral vaccines, adenoviral vectors have emerged as a favorable means for immunization. Therefore, we chose a strategy combining use of these vectors with another successful approach, namely linkage of the vaccine antigen to invariant chain (Ii). To evaluate this strategy we used a mouse model, in which an immunodominant epitope (GP33) of the LCMV glycoprotein (GP) represents the tumor-associated neoantigen. Prophylactic vaccination of C57BL/6 mice with a replication-deficient human adenovirus 5 vector encoding GP linked to Ii (Ad-Ii-GP) resulted in complete protection against GP33-
expressing B16.F10 tumors. Therapeutic vaccination with Ad-Ii-GP delayed tumor growth by more than 2wk compared with sham vaccination. Notably, therapeutic vaccination with the linked vaccine was significantly better than vaccination with adenovirus expressing GP alone (Ad-GP), or GP and Ii unlinked (Ad-GP1Ii). Ad-Ii-GP- induced tumor control depended on an improved generation of the tumor-associated neoantigen-specific CD81 T-cell response and was independent of CD41 T cells. IFN-c was shown to be a key player during the tumor degradation. Finally, Ad-Ii-GP but not Ad-GP vaccination can
break the immunological non-reactivity in GP transgenic mice indicating that our vaccine strategy will prove efficient also against endogenous tumor antigens.
Original languageEnglish
JournalEuropean Journal of Immunology
Volume39
Pages (from-to)2725-2736
ISSN0014-2980
DOIs
Publication statusPublished - 2009
Externally publishedYes

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