CD58/LFA-3 and IL-12 provided by activated monocytes are critical in the in vitro expansion of CD56(+) T cells
ABSTRACT A small proportion of human CD3+ T lymphocytes are known to co-express CD56, an antigen usually restricted in its expression to natural killer (NK) cells. Whereas the in vivo function of CD3+ CD56+ T cells remains unknown, we and others have previously shown that both in vitro and in vivo, these cells can mediate a significantly greater degree of MHC-unrestricted cytotoxicitv against a variety of human tumor cells when compared to either CD3+ CD56- T cells or lymphokine activated killer (LAK) cells. While the mechanismns regulating the in vivo expansion of CD56+ T cells are not known, here we demonstrate the importance of CD2-mediated IL-12-dependent signals in the in vitro expansion of CD56+ T cells. Specifically, we show that activated monocytes provide a contact dependent factor (CD58/LFA-3) and a soluble factor (IL-12), both critical for the in vitro expansion of CD56+ T cells. The biological and therapeutic implications of these findings are discussed.
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- "At the end of the culture, the CD3 + CD56 + cells, derived from CD3 + CD56 − cells, could expand by up to 1000-fold and gave the greatest cytotoxicity against various tumor cell targets, including K562 and B cell lymphoma cell lines, as compared to CD3 + CD56 − cells . The expression of CD56 on these non-MHC-restricted effector T cells was found to be the result of IFN-γ-priming that induced the production of IL-12 by monocytes and the upregulation of CD58 (LFA- 3), both of which were demonstrated to be crucial for the expansion of CD56 + T cells . Subsequently, this unique subset of non-MHC-restricted CD3 + CD56 + T cells was referred to as NK-like T cells since, similar to the NK cells, they do not require prior specific sensitization to induce the recognition of target cells. "
ABSTRACT: Cytokine-induced killer (CIK) cells are polyclonal T effector cells generated when cultured under cytokine stimulation. CIK cells exhibit potent, non-MHC-restricted cytolytic activities against susceptible tumor cells of both autologous and allogeneic origins. Over the past 20 years, CIK cells have evolved from experimental observations into early clinical studies with encouraging preliminary efficacy towards susceptible autologous and allogeneic tumor cells in both therapeutic and adjuvant settings. This paper is our attempt to summarize the available published literature related to CIK cells. Looking into the future, we anticipate that the continuous therapeutic application of CIK cells will likely be developed along two major directions: overcoming the challenge to organize large prospective randomized clinical trials to define the roles of CIK cells in cancer immunotherapy and expanding its spectrum of cytotoxicity towards resistant tumor cells through experimental manipulations.BioMed Research International 03/2010; 2010:435745. DOI:10.1155/2010/435745 · 2.71 Impact Factor
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ABSTRACT: Tesis Univ. Granada. Departamento de Histología. Leída el 27 de octubre de 2008
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ABSTRACT: We recently identified a CD2-mediated, IL-12-dependent signaling pathway that inhibits apoptosis in mitogen-stimulated human gammadelta-T cells. Here we show that gammadelta-T cells which acquire resistance to mitogen-induced apoptosis upregulate IL-12 receptor beta 1 subunit (IL-12Rbeta1); in contrast, gammadelta-T cells which remain sensitive to mitogen-induced apoptosis fail to express IL-12Rbeta1. Next we show that gammadelta-T cells which are rendered resistant to mitogen-induced apoptosis attenuate their expression of the IL-2 receptor alpha chain (IL-2Ralpha/CD25), this in part accounting for their acquired resistance to IL-2-induced death. In contrast, apoptosis-sensitive gammadelta-T cells are shown to persist in their expression of IL-2Ralpha/CD25, thus remaining sensitive to IL-2-induced death. Moreover, we show that apoptosis-resistant, but not apoptosis-sensitive, gammadelta-T cells display an enhanced responsiveness to IL-15, a finding in keeping with the known function of IL-15 as a growth and survival factor. Finally, we present evidence to suggest that this differential responsiveness to IL-15 occurs in part by the increased expression of the IL-15Ralpha chain on apoptosis-resistant gammadelta-T cells, compared to apoptosis-sensitive gammadelta-T cells. The biological and clinical implications of these findings are discussed.Cancer Immunology and Immunotherapy 02/2002; 50(11):625-37. DOI:10.1007/s00262-001-0244-4 · 3.94 Impact Factor