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<p>The efficacy of dendritic cell (DC) cancer vaccines is linked to poor immunogenicity of tumor-associated antigens and failure to elicit robust MHC class II-restricted CD4⁺ T-cell responses. Here, we introduce PROTEXI, a DC vaccine platform that optimizes tumor immunity by co-presenting tumor-specific CD8⁺ T-cell epitopes alongside CD4⁺ T helper epitopes from the SARS-CoV-2 Spike protein, leveraging widespread anti-viral immunity. In preclinical mouse models of melanoma and breast cancer, PROTEXI significantly reduces tumor growth and improves survival by promoting robust T cell infiltration into immune-cold tumors, increasing cytotoxic T cell responses via epitope spreading, and activating genes linked to optimal DC, NK cell, and T cell function. Furthermore, PROTEXI elicits superior responses when combined with other immunotherapy agents in models of therapy-resistant tumors. Finally, in a humanized mouse model of melanoma, PROTEXI vaccine co-presenting CD4⁺ T-specific Spike epitopes with CD8⁺ T cell-restricted PRAME and MAGE-A3 antigens, significantly reduces tumor burden. Thus, these data underscore the potential of harnessing pre-existing viral-specific immunity to enhance the efficacy of DC vaccines in immune-cold tumors.</p>

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The Dendritic Cell-based Vaccine PROTEXI leverages Antiviral CD4 T cell Memory to boost anti-tumor immune responses in mice

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月27日

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  • Jin Muk Kang,
  • Eun Hyang Han,
  • Jin-Kyu Choi,
  • Seunghee Youm,
  • Tej Pareek,
  • Liraz Levi,
  • Seong-Jin Kim,
  • John Letterio,
  • Seunghwan Lim

摘要

The efficacy of dendritic cell (DC) cancer vaccines is linked to poor immunogenicity of tumor-associated antigens and failure to elicit robust MHC class II-restricted CD4⁺ T-cell responses. Here, we introduce PROTEXI, a DC vaccine platform that optimizes tumor immunity by co-presenting tumor-specific CD8⁺ T-cell epitopes alongside CD4⁺ T helper epitopes from the SARS-CoV-2 Spike protein, leveraging widespread anti-viral immunity. In preclinical mouse models of melanoma and breast cancer, PROTEXI significantly reduces tumor growth and improves survival by promoting robust T cell infiltration into immune-cold tumors, increasing cytotoxic T cell responses via epitope spreading, and activating genes linked to optimal DC, NK cell, and T cell function. Furthermore, PROTEXI elicits superior responses when combined with other immunotherapy agents in models of therapy-resistant tumors. Finally, in a humanized mouse model of melanoma, PROTEXI vaccine co-presenting CD4⁺ T-specific Spike epitopes with CD8⁺ T cell-restricted PRAME and MAGE-A3 antigens, significantly reduces tumor burden. Thus, these data underscore the potential of harnessing pre-existing viral-specific immunity to enhance the efficacy of DC vaccines in immune-cold tumors.