Abstract:
:Cancer vaccines genetically engineered to produce interleukin 2 have been investigated intensively in a series of animal models and are at the point of entering into clinical trials. In this study we demonstrate a strong correlation between the rate of interleukin 2 production and the protection efficiency of murine S91 melanoma cell (clone M-3) vaccines. Best immunization is achieved with vaccines producing medium interleukin 2 levels of 1000-3000 units per 10(5) cells per day. Reduced interleukin 2 production evokes a corresponding decline in the number of successfully treated animals. Unexpectedly, when interleukin 2 expression is raised to high levels of 5000-7500 units per 10(5) cells per day, protection is completely absent because of impaired generation of tumor-specific cytotoxic T lymphocytes. In comparison, granulocyte-macrophage colony-stimulating factor as immunomodulator induces substantial immunization even at a moderate level of secretion and protects all animals at the maximal obtainable level of secretion. Our findings demonstrate the importance of the interleukin 2 level produced by genetically modified tumor cells and may have substantial impact for the clinical application of cancer vaccines.
journal_name
Proc Natl Acad Sci U S Aauthors
Schmidt W,Schweighoffer T,Herbst E,Maass G,Berger M,Schilcher F,Schaffner G,Birnstiel MLdoi
10.1073/pnas.92.10.4711subject
Has Abstractpub_date
1995-05-09 00:00:00pages
4711-4issue
10eissn
0027-8424issn
1091-6490journal_volume
92pub_type
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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