期刊
JOURNAL OF IMMUNOTHERAPY
卷 41, 期 8, 页码 361-368出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/CJI.0000000000000242
关键词
cancer stem cells; vaccine; PD-L1; CTLA-4; immunotherapy
资金
- National Nature Sciences Foundation of China [81301954, 81500639]
- Hubei Provincial Health and Family Planning Scientific Research Project [2015060101010043]
- Gillson Longenbaugh Foundation [UL1TR000433]
- University of Michigan MICHR Grant [UL1TR000433]
- NATIONAL CENTER FOR ADVANCING TRANSLATIONAL SCIENCES [UL1TR000433, UL1TR002240] Funding Source: NIH RePORTER
Immune checkpoint inhibitors and monoclonal antibodies reinvigorate cancer immunotherapy. However, these immunotherapies only benefit a subset of patients. We previously reported that ALDH(high) tumor cells were highly enriched for cancer stem cells (CSCs), and ALDH(high) CSC lysate-pulsed dendritic cell (CSC-DC) vaccine was shown to induce CSC-specific cytotoxic T lymphocytes. In this study, we investigated the CSC targeting effect of the CSC-DC vaccine combined with a dual blockade of programmed death-ligand 1 and cytotoxic T-lymphocyte-associated protein (CTLA-4) in B16-F10 murine melanoma tumor model. Our data showed that animals treated with the dual blockade of programmed death-ligand 1 and CTLA-4 and CSC-DC vaccine conferred significantly more tumor regression than the CSC-DC vaccine alone. Importantly, the triple combination treatment dramatically eliminated ALDH(high) CSCs in vivo. We observed that CSC-DC vaccine in combination with anti-PD-L1 and anti-CTLA-4 administration resulted in approximate to 1.7-fold fewer PD-1(+)CD8(+) T cells and approximate to 2.5-fold fewer CTLA-4(+)CD8(+) T cells than the populations observed following the CSC-DC vaccination alone. Moreover, significant antitumor effects and dramatically eliminated ALDH(high) CSCs following the triple combination treatment were accompanied by significantly enhanced T-cell expansion, suppressed transforming growth factor secretion, enhanced IFN- secretion, and significantly enhanced host specific CD8(+) T-cell response against CSCs. Collectively, these data showed that administration of a-PD-L1 and a-CTLA-4 combined with CSC-DC vaccine may represent an effective immunotherapeutic strategy for cancer patients in clinical.
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