Clinical & translational immunology · 2022
Pseudocowpox virus, a novel vector to enhance the therapeutic efficacy of antitumor vaccination.
СтатьяНазвание и аннотация: Перевод в очереди
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Ramos Rodrigo Nalio, Tosch Caroline, Kotsias Fiorella, Claudepierre Marie-Christine, Schmitt Doris, Remy-Ziller Christelle, Hoffmann Chantal, Ricordel Marine, Nourtier Virginie, Farine Isabelle, Laruelle Laurence, Hortelano Julie, Spring-Giusti Clementine, Sedlik Christine, Le Tourneau Christophe, Hoffmann Caroline, Silvestre Nathalie, Erbs Philippe, Bendjama Kaidre, Thioudellet Christine, Quemeneur Eric, Piaggio Eliane, Rittner Karola
Аннотация
OBJECTIVE: Antitumor viral vaccines, and more particularly poxviral vaccines, represent an active field for clinical development and translational research. To improve the efficacy and treatment outcome, new viral vectors are sought, with emphasis on their abilities to stimulate innate immunity, to display tumor antigens and to induce a specific T-cell response.
METHODS: We screened for a new poxviral backbone with improved innate and adaptive immune stimulation using IFN-α secretion levels in infected PBMC cultures as selection criteria. Assessment of virus effectiveness was made in vitro and in vivo.
RESULTS: The bovine pseudocowpox virus (PCPV) stood out among several poxviruses for its ability to induce significant secretion of IFN-α. PCPV produced efficient activation of human monocytes and dendritic cells, degranulation of NK cells and reversed MDSC-induced T-cell suppression, without being offensive to activated T cells. A PCPV-based vaccine, encoding the HPV16 E7 protein (PCPV-E7), stimulated strong antigen-specific T-cell responses in TC1 tumor-bearing mice. Complete regression of tumors was obtained in a CD8+ T-cell-dependent manner after intratumoral injection of PCPV-E7, followed by intravenous injection of the cancer vaccine MVA-E7. PCPV also proved active when injected repeatedly intratumorally in MC38 tumor-bearing mice, generating tumor-specific T-cell responses without encoding a specific MC38 antigen. From a translational perspective, we demonstrated that PCPV-E7 effectively stimulated IFN-γ production by T cells from tumor-draining lymph nodes of HPV+-infected cancer patients.
CONCLUSION: We propose PCPV as a viral vector suitable for vaccination in the field of personalised cancer vaccines, in particular for heterologous prime-boost regimens.
METHODS: We screened for a new poxviral backbone with improved innate and adaptive immune stimulation using IFN-α secretion levels in infected PBMC cultures as selection criteria. Assessment of virus effectiveness was made in vitro and in vivo.
RESULTS: The bovine pseudocowpox virus (PCPV) stood out among several poxviruses for its ability to induce significant secretion of IFN-α. PCPV produced efficient activation of human monocytes and dendritic cells, degranulation of NK cells and reversed MDSC-induced T-cell suppression, without being offensive to activated T cells. A PCPV-based vaccine, encoding the HPV16 E7 protein (PCPV-E7), stimulated strong antigen-specific T-cell responses in TC1 tumor-bearing mice. Complete regression of tumors was obtained in a CD8+ T-cell-dependent manner after intratumoral injection of PCPV-E7, followed by intravenous injection of the cancer vaccine MVA-E7. PCPV also proved active when injected repeatedly intratumorally in MC38 tumor-bearing mice, generating tumor-specific T-cell responses without encoding a specific MC38 antigen. From a translational perspective, we demonstrated that PCPV-E7 effectively stimulated IFN-γ production by T cells from tumor-draining lymph nodes of HPV+-infected cancer patients.
CONCLUSION: We propose PCPV as a viral vector suitable for vaccination in the field of personalised cancer vaccines, in particular for heterologous prime-boost regimens.