A sensitivity scale for targeting T cells with chimeric antigen receptors (CARs) and bispecific T-cell Engagers (BiTEs)
Open Access
- 1 September 2012
- journal article
- Published by Taylor & Francis Ltd in OncoImmunology
- Vol. 1 (6), 863-873
- https://doi.org/10.4161/onci.20592
Abstract
Although T cells can mediate potent antitumor responses, immune tolerance mechanisms often result in the deletion or inactivation of T cells that express T-cell receptors (TCRs) against potentially effective target epitopes. Various approaches have been devised to circumvent this problem. In one approach, the gene encoding an antibody against a cancer-associated antigen is linked, in the form of a single-chain variable fragment (scFv), to genes that encode transmembrane and signaling domains. This chimeric antigen receptor (CAR) is then introduced into T cells for adoptive T-cell therapy. In another approach, the anti-cancer scFv is fused to a scFv that binds to the CD3ε subunit of the TCR/CD3 complex. This fusion protein serves as a soluble, injectable product that has recently been termed bispecific T-cell engager (BiTE). Both strategies have now been tested in clinical trials with promising results, but the comparative efficacies are not known. Here, we performed a direct comparison of the in vitro sensitivity of each strategy, using the same anti-cancer scFv fragments, directed against a tumor-specific glycopeptide epitope on the sialomucin-like transmembrane glycoprotein OTS8, which results form a cancer-specific mutation of Cosmc. While both approaches showed specific responses to the epitope as revealed by T cell-mediated cytokine release and target cell lysis, CAR-targeted T cells were more sensitive than BiTE-targeted T cells to low numbers of antigens per cell. The sensitivity scale described here provides a guide to the potential use of these two different approaches.Keywords
This publication has 69 references indexed in Scilit:
- Chimeric Antigen Receptor–Modified T Cells in Chronic Lymphoid LeukemiaNew England Journal of Medicine, 2011
- Antibody recognition of a unique tumor-specific glycopeptide antigenProceedings of the National Academy of Sciences of the United States of America, 2010
- Features of responding T cells in cancer and chronic infectionCurrent Opinion in Immunology, 2010
- Case Report of a Serious Adverse Event Following the Administration of T Cells Transduced With a Chimeric Antigen Receptor Recognizing ERBB2Molecular Therapy, 2010
- T Cell Receptor Gene Therapy for CancerHuman Gene Therapy, 2009
- HER2-targeted therapy in breast cancer. Monoclonal antibodies and tyrosine kinase inhibitorsCancer Treatment Reviews, 2009
- Engineering higher affinity T cell receptors using a T cell display systemJournal of Immunological Methods, 2008
- Tumor-specific immune responsesSeminars in Immunology, 2008
- Cancer Regression in Patients After Transfer of Genetically Engineered LymphocytesScience, 2006
- Plat-E: an efficient and stable system for transient packaging of retrovirusesGene Therapy, 2000