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- W2073778314 abstract "Generation of antigen-specific CD8+ T cell responses is considered optimal for an effective immunotherapy against cancer. In this study, we provide a proof of principle that in vitro observed diminished CD8+ T cell response provided a strong in vivo tumor protection. Immunization with an adenovirus vaccine containing ovalbumin (OVA) gene (Ad5-OVA) strongly induces antigen-specific CD8+ T cell responses measured in vitro using various immunological assays. However, in an attempt to augment the antigenic CD8+ T cell response, coinjection of a TLR9 agonist CpG ODN with the viral vaccine unexpectedly reduced the CD8+ T cell responses measured in vitro but provided a remarkably enhanced tumor protection compared to the CD8+ T cell response generated by Ad5-OVA vaccine alone. Interestingly, despite reduced ex vivo/in vitro CD8+ T cell responses following Ad5-OVA+CpG immunization, immunodepletion studies revealed that the augmented anti-tumor immunity was primarily dependent on CD8+ T cells. The magnitude and effector function of anti-OVA CD8+ T cells remain low following primary and secondary antigenic challenge, presenting a dichotomy between in vitro CD8 T cell responses and in vivo anti-tumor immunity. To examine the impact of CpG ODN, we observed that presence of CpG suppresses the CD8+ T cell proliferation both in vitro and in vivo. These data demonstrate that coadministration of adenovirus vaccine with a TLR9 agonist can generate potentially effective tumor-reactive CD8+ T cells in vivo. In addition, the results indicate that widely used standard immune parameters may not predict the vaccine efficacy containing a TLR9 agonist as adjuvant." @default.
- W2073778314 created "2016-06-24" @default.
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- W2073778314 creator A5039812436 @default.
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- W2073778314 date "2007-06-12" @default.
- W2073778314 modified "2023-10-09" @default.
- W2073778314 title "Paradoxical enhancement of CD8 T cell-dependent anti-tumor protection despite reduced CD8 T cell responses with addition of a TLR9 agonist to a tumor vaccine" @default.
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- W2073778314 doi "https://doi.org/10.1002/ijc.22873" @default.
- W2073778314 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17565748" @default.
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