Redirecting mouse CTL against colon carcinoma: Superior signaling efficacy of single-chain variable domain chimeras containing TCR-ζ vs FcεRI-γ

N. M. Haynes, M. B. Snook, J. A. Trapani, L. Cerruti, S. M. Jane, M. J. Smyth, P. K. Darcy

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110 Citations (Scopus)


The structurally related TCR-ζ and Fc receptor for IgE (FcεRI)-γ are critical signaling components of the TCR and FcεRI, respectively. Although chimeric Ab receptors containing ζ and γ signaling chains have been used to redirect CTL to tumors, a direct comparison of their relative efficacy has not previously been undertaken. Here, in naive T lymphocytes, we compare the signaling capacities of the ζ and γ subunits within single-chain variable domain (scFv) chimeric receptors recognizing the carcinoembryonic Ag (CEA). Using a very efficient retroviral gene delivery system, high and equivalent levels of scFv-ζ and scFv-γ receptors were expressed in T cells. Despite similar levels of expression and Ag-specific binding to colon carcinoma target cells, ligation of scFv-anti-CEA-ζ chimeric receptors on T cells resulted in greater cytokine production and direct cytotoxicity than activation via scFv-anti-CEA-γ receptors. T cells expressing scFv-ζ chimeric receptors had a greater capacity to control the growth of human colon carcinoma in scid/scid mice or mouse colon adenocarcinoma in syngeneic C57BL/6 mice. Overall, these data are the first to directly compare and definitively demonstrate the enhanced potency of T cells activated via the ζ signaling pathway.

Original languageEnglish
Pages (from-to)182-187
Number of pages6
JournalJournal of Immunology
Issue number1
Publication statusPublished - 1 Jan 2001
Externally publishedYes

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