期刊
THERANOSTICS
卷 9, 期 8, 页码 2299-2314出版社
IVYSPRING INT PUBL
DOI: 10.7150/thno.30577
关键词
Cancer immunotherapy; vaccine; immune checkpoint blockade; hydrogel; drug delivery
资金
- National Natural Science Foundation of China [31670977, 31870950, 51703246, 21604095]
- CAMS Innovation Fund for Medical Sciences [2017-I2M-4-001, 2016-I2M-3-022, 2017-I2M-3-022]
- Key Projects of Advanced Manufacturing Technology for High Quality Veterinary Drugs [17ZXGSNC00080]
- Non-profit Central Research Institute Fund of Chinese Academy of Medical Sciences [2018RC350017]
- Tianjin Innovation and Promotion Plan Key Innovation Team of Immunoreactive Biomaterials
- Specific Program for High-Tech Leader & Team of Tianjin Government
- Tianjin Natural Science Foundation [17JCQNJC13800]
Immunotherapy, an attractive option for cancer treatment, necessitates the direct stimulation of immune cells in vivo and the simultaneous effective inhibition of immunosuppressive tumor microenvironments. Methods: In the present study, we developed an injectable PEG-b-poly(L-alanine) hydrogel for co-delivery of a tumor vaccine and dual immune checkpoint inhibitors to increase tumor immunotherapy efficacy. Tumor cell lysates, granulocyte-macrophage colony stimulating factor (GM-CSF), and immune checkpoint inhibitors (anti-CTLA-4/PD-1 antibody) were readily encapsulated in the porous hydrogel during the spontaneous self-assembly of polypeptide in aqueous solution. Results: Sustained release of tumor antigens and GM-CSF persistently recruited and activated dendritic cells (DCs) and induced a strong T-cell response in vivo, which was further enhanced by the immune checkpoint therapy. The hydrogel vaccine also upregulated the production of IgG and the secretion of cytokines including IFN-gamma, IL-4, and TNF-alpha. Importantly, the hydrogel-based combination therapy had superior immunotherapy effects against melanoma and 4T-1 tumor in comparison with the vaccine alone or in addition with a single immune checkpoint blockade. In studying the underlying mechanism, we found that the hydrogel-based combinatorial immunotherapy not only significantly increased the activated effector CD8(+) T cells within the spleens and tumors of vaccinated mice, but also reduced the ratio of Tregs. Conclusion: Our findings indicate that the polypeptide hydrogel can be used as an effective sustained delivery platform for vaccines and immune checkpoint inhibitors, providing an advanced combinatorial immunotherapy approach for cancer treatment.
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