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- W1594920269 endingPage "3970" @default.
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- W1594920269 abstract "Abstract Anti-CD3 x anti-tumor-bispecific Abs have been used to redirect cytotoxic T cells to tumor cells in an MHC-unrestricted fashion and to induce their rejection in vivo. We have recently described a recombinant bispecific single-chain Ab that combines four different V regions of two Abs, anti-17-1A and anti-CD3, on one polypeptide chain. It folds correctly to a 60-kDa globular protein and is secreted in fully functional form by a high producer Chinese hamster ovary cell line. In this work, we report that its remarkable cytotoxicity against 17-1A+ tumor cells is exerted via T cells without an apparent engagement of a detectable costimulatory pathway. T cells are activated only by the bispecific Ab when coincubated with 17-1A+ target cells. In a chromium release assay, CD8+ T cells reach maximal tumor cell cytotoxicity within 4 h, while CD4+ T cells need about 20 h to reach similar levels of cytotoxicity. Addition of costimulatory CD28 Abs did not lead to a further increase in cytotoxicity. Its remarkable stability at 37 degrees in serum, the ease of production, and purification by affinity chromatography via polyhistidine tail make this smaller version of a bispecific Ab a promising candidate for a therapeutic trial in patients with solid tumor. Because adjuvant therapy with an intact, much less cytotoxic IgG2a Ab against the 17-1A target had already increased the 7-yr survival of colorectal cancer patients by 30%, the presented small bispecific construct lacking the immunogenic murine Fc region as well as autochthonous T lymphocyte stimulatory activity warrants a therapeutic trial in patients with minimal residual 17-1A+ cancer." @default.
- W1594920269 created "2016-06-24" @default.
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- W1594920269 date "1997-04-15" @default.
- W1594920269 modified "2023-10-18" @default.
- W1594920269 title "Biologic properties of a bispecific single-chain antibody directed against 17-1A (EpCAM) and CD3: tumor cell-dependent T cell stimulation and cytotoxic activity." @default.
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- W1594920269 doi "https://doi.org/10.4049/jimmunol.158.8.3965" @default.
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