Effective T cell co-stimulation is critical for the primary induction and subsequent specific T cell responses. In addition to increased co-inhibitory signals, insufficient co-stimulatory tumor maintenance of antigen- microenvironment accounts for a great deal of the suboptimal activation and maintenance of tumor-killing CD8 T cells. Thus, one of the major goals in the immunotherapy of cancer is to provide sustainable co-stimulatory signal to empower the generation and persistence of effective tumor-killing CD8 T cells and ultimately to achieve durable tumor control. Yet, beyond engineered CAR-T cells that contain co-stimulatory motif in the engineered TCR, means to empower sustained in situ CD8 T cell co-stimulation are still far from expectations, due to the unsustainable expression of the canonical and activation-induced family of co-stimulatory receptors on CD8 T cells in the tumor microenvironment. In this proposal, we propose to activate the constitutively expressed human CD8 T cell co-stimulatory receptor NKG2D with a novel superagonist to amplify and sustain tumor antigen-specific CD8 T cell antitumor immunity. We hypothesize that therapy with NKG2D superagonist can augment T cell-mediated immunotherapy of cancer through providing sustainable magnitude of co- stimulation to induce effective and persistent antigen-specific immune responses in tumors. We propose three Specific Aims: 1) To delineate mechanisms whereby the NKG2D superagonist provides sustainable magnitude of co-stimulation to TCR/CD3 signaling; 2) To determine the impact of the NKG2D superagonist co- stimulation on cancer therapeutic effect of adoptive T cell therapy; 3) To determine the synergistic or collaborative cancer therapeutic effect of the NKG2D superagonist co-stimulation in combination with T cell checkpoint blockades. Providing that the NKG2D superagonist is being optimized for human use, if our hypothesis is proven, the therapy can be translated into clinics in the near future to significantly improve current practice of cancer immunotherapy.

Public Health Relevance

This proposed study is to overcome one of the current critical challenges of adaptive immunotherapy of cancer. We propose a novel approach to sustain the function of T cell co-stimulatory machinery and thus to empower the effectiveness and persistence of tumor-specific T cell activation. We anticipate that the outcome of our study would have significant impact on improving current practice for cancer immunotherapy, such as therapies of immune checkpoint blockade and adoptive T cell transfer.

Agency
National Institute of Health (NIH)
Institute
National Cancer Institute (NCI)
Type
Research Project (R01)
Project #
1R01CA208246-01
Application #
9158250
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Yovandich, Jason L
Project Start
2016-09-01
Project End
2021-08-31
Budget Start
2016-09-01
Budget End
2017-08-31
Support Year
1
Fiscal Year
2016
Total Cost
Indirect Cost
Name
Medical University of South Carolina
Department
Microbiology/Immun/Virology
Type
Schools of Medicine
DUNS #
183710748
City
Charleston
State
SC
Country
United States
Zip Code
29403
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