Elimination of CD4+ T cells may overcome suppression of anti-HER2 immune responses in tumor-bearing hosts |
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Authors: | Ishihara Mikiya Tawara Isao Wang Lijie Takahashi Yoshiyuki Shiku Hiroshi |
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Institution: | Second Department of Internal Medicine, Mie University School of Medicine, Tsu 514-8507, Japan. |
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Abstract: | In this study, we analyzed specific anti-tumor immune responses in tumor-bearing hosts by measuring HER2-specific CD8+ T cell responses. No measurable HER2-derived peptide (HER2p63)-specific CD8+ T cells were present in the spleens of mice in the early to late phase of tumor-bearing. Vaccination with HER2 protein and cholesteryl group-bearing pullulan (CHP-HER2 complex) induced HER2-specific CD8+ T cells, but their numbers continuously declined as tumors continued growing. Removal of CD4+ T cells by anti-CD4 monoclonal antibody in the early tumor-bearing stage resulted in tumor regression. The combination of CHP-HER2 complex vaccination and depletion of CD4+ T cells enhanced and restored HER2-specific CD8+ T cells in the late stage of tumor-bearing, and also suppressed tumor growth. These results indicate the importance of manipulation of CD4+ T cells in developing effective immunotherapies as cancer vaccines. |
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