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Virus-like particles (VLPs) are able to induce cytotoxic T-cell responses in the absence of infection or replication. This makes VLPs promising candidates for the development of recombinant vaccines. However, VLPs are also potent inducers of B-cell responses, and it is generally assumed that such VLP-specific antibodies interfere with the induction of protective immune responses, a phenomenon summarized as carrier suppression. In this study, we investigated the impact of preexisting VLP-specific antibodies on the induction of specific cytotoxic T-cell and Th-cell responses in mice. The data show that VLP-specific antibodies did not measurably reduce antigen presentation in vitro or in vivo. Nevertheless, T-cell priming was slightly reduced by antigen-specific antibodies; however, the overall reduction was limited and vaccination with VLPs in the presence of VLP-specific antibodies still resulted in protective T-cell responses. Thus, carrier suppression is unlikely to be a limiting factor for VLP-based T-cell vaccines.

Virus-Like Particles as Carriers for T-Cell Epitopes: Limited Inhibition of T-Cell Priming by Carrier-Specific Antibodies