Abstract
Cross-linking an anti-tumor antibody, specific for tumor cell surface antigens, and an anti-lymphocyte antibody, specific for the T lymphocyte receptor complex (TCR/ CD3), produces a heteroconjugate that can direct T cells to lyse tumor cells. We tested the ability of anti-tumor × anti-lymphocyte (CD3) heteroconjugates to redirect human peripheral blood lymphocytes (PBLs) to lyse human colon cancer cells in cytotoxicity assays and in a murine colon tumor model. We demonstratedin vitro,that cultured human PBLs alone produced low levels of tumor lysis, but PBLs treated with anti-tumor × anti-CD3 heteroconjugates produced significantly greater tumor cell lysis (P<0.0025). Similarly, nude mice injected with LS174T human colon cancer cells and treated with cultured human PBLs and anti-tumor × anti-CD3 heteroconjugates survived significantly longer than saline control mice (P<0.01), or mice treated with PBLs alone (P<0.01), or heteroconjugates alone (P<0.05). F(ab′)2heteroconjugates were equally as effective in prolonging animal survival, but irrelevant heteroconjugates and monoclonal anti-tumor antibodies showed no therapeutic benefit. Anti-tumor × anti-CD3 heteroconjugates may represent an effective approach to tumor-specific cellular immunotherapy.
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Read at the meeting of The American Society of Colon and Rectal Surgeons, St. Louis, Missouri, April 29–May 4, 1990. Dr. Nelson was supported by the Leon Hirsch Traveling Scholarship, awarded by the Research Foundation of The American Society of Colon and Rectal Surgeons. This material was acknowledged with a research award from the New England Society of Colon and Rectal Surgeons. Dr. Donohue is the recipient of a Cancer Development Award from the American Cancer Society.
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Nelson, H., Ramsey, P.S., McKean, D.J. et al. Anti-tumor × anti-lymphocyte heteroconjugates augment colon tumor cell lysisin Vitro and prevent tumor growthin Vivo . Dis Colon Rectum 34, 140–147 (1991). https://doi.org/10.1007/BF02049988
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DOI: https://doi.org/10.1007/BF02049988