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Activation of CD8+T-cells is an essential part of immune responses elicited by recombinant modified vaccinia virus Ankara (MVA). Strategies to enhance T-cell responses to antigens may be particularly necessary for broadly protective immunization against influenza A virus infections or for candidate vaccines targeting chronic infections and cancer. Here, we tested recombinant MVAs that targeted a model antigen, GFP, to different localizations in infected cells. In vitro characterization demonstrated that GFP accumulated in the nucleus (MVA-nls–GFP), associated with cellular membranes (MVA-myr–GFP) or was equally distributed throughout the cell (MVA–GFP). On vaccination, we found significantly higher levels of GFP-specific CD8+T-cells in MVA-myr–GFP-vaccinated BALB/c mice than in those immunized with MVA–GFP or MVA-nls–GFP. Thus, myristoyl modification may be a useful strategy to enhance CD8+T-cell responses to MVA-delivered target antigens.
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