Abstract
T cells bearing chimeric antigen receptors (CARs) are broadly categorised into first- and second-generation receptors. Second-generation CARs contain a co-stimulatory signalling molecule and have been shown to secrete IL-2, undergo greater proliferation and to have enhanced persistence in vivo. However, we have shown that T cells bearing a first-generation CAR containing a CD19-targeting scFv (single-chain variable fragment) and the CD3ζ-signalling domain are able to produce IL-2 upon co-culture with CD19+ B-cell lymphomas independent of CD28 activity. Here, we report that signalling through endogenous CD2 following ligation with its ligands, CD48 in mouse and CD58 in humans, drives IL-2 production by first-generation CD19-specific CAR. Moreover, the high levels of IL-2 produced by human T cells engrafted with a second-generation CD28-containing CAR during target-cell recognition are dependent to a degree upon CD2 receptor activity. These observations highlight the fact that the functional activity induced by T-cell-expressed CARs is dependent upon endogenous ‘natural’ receptor interactions. A deeper understanding of the role of these activities will serve to further refine the design of future CARs to either exploit or avoid these interactions.
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Acknowledgements
We thank Professor Doug Fearon for providing the 1D3 hybridoma, and Dr Taylor Jacks and Dr Tim Sommerville for the pSicoR vectors. We would also like to thank the service units at the Paterson Institute for Cancer Research, in particular, the staff in the Molecular Biology Core Facility and the flow cytometry service. We also thank the Kay Kendall Leukaemia Fund, Cancer Research UK and the FP6 programme ‘ATTACK’ for funding this work. EJC was funded by the Kay Kendall Leukaemia Fund. DGR, JSB, REH and DEG were funded by Cancer Research UK.
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Cheadle, E., Rothwell, D., Bridgeman, J. et al. Ligation of the CD2 co-stimulatory receptor enhances IL-2 production from first-generation chimeric antigen receptor T cells. Gene Ther 19, 1114–1120 (2012). https://doi.org/10.1038/gt.2011.192
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DOI: https://doi.org/10.1038/gt.2011.192
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