Abstract
Tumor-derived autophagome (DRibble) is an effective therapeutic cancer vaccine inducing T cell recognition and death of tumor cells in mice. However, the potential for improved anti-tumor response still remains. Our previous study demonstrated that two repeats of a mycobacterial HSP70407–426 (M2) peptide acted as adjuvant in improving anti-tumor efficacy of human umbilical vein endothelial cell (HUVEC) vaccine. Here, a DRibble vaccine conjugated with M2 (DRibble-M2) was designed as a novel vaccine to enhance anti-tumor activity. Compared with DRibble alone, DRibble-M2 vaccination more significantly inhibited the growth of mouse Lewis lung cancer both in a subcutaneous tumor model and in a lung metastasis model. Higher expression of antigen-specific CTL was induced by DRibble-M2. DRibble-M2 induced higher CD83 and CD86 expression in DC2.4 and also improved the internalization of DRibble antigen into DC2.4. Our data indicated that DRibble-M2 is a potential vaccine for clinical cancer therapy.
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Acknowledgments
We thank Dr. Hong-Ming Hu for his contribution to this study. The study was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the National Natural Science Foundation of China (No. 81541158), the Promotive Research Fund for Young and Middle-Aged Scientists of Shandong Province (BS2014YY051), and the International Program of Nanjing Scientific and Technological Commission (201303049).
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Jian Li and Yun Xing are contributed equally to this work.
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Li, J., Xing, Y., Zhou, Z. et al. Microbial HSP70 peptide epitope 407–426 as adjuvant in tumor-derived autophagosome vaccine therapy of mouse lung cancer. Tumor Biol. 37, 15097–15105 (2016). https://doi.org/10.1007/s13277-016-5309-2
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DOI: https://doi.org/10.1007/s13277-016-5309-2