期刊
CANCER RESEARCH
卷 69, 期 8, 页码 3545-3553出版社
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-08-2779
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资金
- National Cancer Institute [R01 CA56821, P01 CA33049, P01 CA59350]
- Swim Across America, Lita Annenberg Hazen Foundation
- TJ Martell Foundation
- Louis and Anne Abrons Foundation
- Cancer Research Institute
- Cancer Research Institute Fellowship Award
- American Society of Clinical Oncology Young Investigator Award
- IT-C Fellowship
- Damon Runyon-Lilly Clinical Investigator Award
How the immune system recognizes and responds to mutations expressed by cancer cells is a critical issue for cancer immunology. Mutated self-polypeptides are particularly strong tumor-specific rejection antigens for natural tumor immunity, but we know remarkably little about T-cell responses to mutated self (luring tumor growth ire vivo, including levels of response, kinetics, and correlates that predict tumor rejection. To address these questions, a mutated self-antigen, designated tyrosinase-related protein 1 (Tyrp1)-WM, derived from Tyrp1 was expressed in the poorly immunogenic, spontaneously arising B16 melanoma and the immunogenic, chemically induced LiHa fibrosarcoma. Syngeneic mice challenged with LiHa fibrosarcoma cells expressing Tyrp1-WM, but not native Tyrp1, induced specific CD8(+) and CD4(+) T-cell responses against defined mutated epitopes in tumor-draining lymph nodes and in tumors. Subsequently, specific CD8(+) T-cell responses contracted as a minority of tumors progressed. B16 melanomas expressing Tyrp1-WM induced minimal T-cell responses, and no tumor immunity was detected. Treatment with an agonist monoclonal antibody against glucocorticoid-induced tumor necrosis factor receptor family-related gene (GITR) increased the level of CD8(+) T cells recognizing a peptide derived from the Tyrp1-WM sequence and the proportion of mice rejecting tumors. These results show that B16 tumors expressing mutations that generate strongly immunogenic epitopes naturally induce T-cell responses, which are insufficient to reject tumors. Immune modulation, such as inducing GITR signaling, is required to enhance CD8(+) T-cell responses to specific mutations and to lead to tumor rejection. [Cancer Res 2(109;69(8):3545-53]
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