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The Journal of Immunology, 2000, 164: 3705-3712.
Copyright © 2000 by The American Association of Immunologists

Redirected Perforin-Dependent Lysis of Colon Carcinoma by Ex Vivo Genetically Engineered CTL1

Phillip K. Darcy2,*, Nicole M. Haynes*, Marie B. Snook*, Joseph A. Trapani*, Loretta Cerruti{dagger}, Stephen M. Jane{dagger} and Mark J. Smyth*

* Cellular Cytotoxicity Laboratory, The Austin Research Institute, Heidelberg, Victoria, Australia; and {dagger} Rotary Bone Marrow Research Laboratory, Royal Melbourne Hospital, Parkville, Victoria, Australia

The redirection of autologous lymphocytes to predefined tumor target Ags has considerable potential for the immunotherapeutic treatment of cancer; however, robust experimental systems for comparing various approaches have not been developed. Herein, we have generated a single chain variable domain anti-carcinoembryonic Ag (CEA) Fc{epsilon} receptor I {gamma}-chain fusion (scFv anti-CEA) receptor and demonstrated high-level expression of this chimeric receptor in naive mouse T lymphocytes by retroviral gene transduction. These gene-modified CTL were able to lyse CEA+ targets and secrete high levels of IFN-{gamma} following Ag stimulation. Depletion studies demonstrated that specific tumor cell cytotoxicity was mediated by gene-modified CD8+ T cells. Importantly, in increasingly stringent tests of efficacy in vivo, transduced CTL were sequentially shown to reject CEA+ colon carcinoma cells in a Winn assay and then reject established s.c. colon carcinoma in scid or syngeneic mice. Furthermore, using gene-targeted and scFv anti-CEA receptor-transduced donor CTL, perforin and IFN-{gamma} were demonstrated to be absolutely critical for the eradication of colon carcinoma in mice. In summary, we have developed a highly efficient gene transfer system for evaluating chimeric receptor expression in cytotoxic lymphocytes. This series of experiments has revealed the utility of scFv anti-CEA chimeras in providing mouse T cells the capacity to reject colon carcinoma in an Ag- and perforin-specific manner.







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