Abstract
Adoptive transfer of chimeric antigen receptor (CAR)-redirected T lymphocytes (CAR-T cells) has had less striking therapeutic effects in solid tumors1,2,3 than in lymphoid malignancies4,5. Although active tumor-mediated immunosuppression may have a role in limiting the efficacy of CAR-T cells6, functional changes in T lymphocytes after their ex vivo manipulation may also account for the reduced ability of cultured CAR-T cells to penetrate stroma-rich solid tumors compared with lymphoid tissues. We therefore studied the capacity of human in vitro–cultured CAR-T cells to degrade components of the extracellular matrix (ECM). In contrast to freshly isolated T lymphocytes, we found that in vitro–cultured T lymphocytes lack expression of the enzyme heparanase (HPSE), which degrades heparan sulfate proteoglycans, the main components of ECM. We found that HPSE mRNA is downregulated in in vitro–expanded T cells, which may be a consequence of p53 (officially known as TP53, encoding tumor protein 53) binding to the HPSE gene promoter. We therefore engineered CAR-T cells to express HPSE and showed their improved capacity to degrade the ECM, which promoted tumor T cell infiltration and antitumor activity. The use of this strategy may enhance the activity of CAR-T cells in individuals with stroma-rich solid tumors.
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Acknowledgements
The authors would like to thank I.Vlodavsky and M. Brenner for the critical review of the manuscript and C. Gillespie for editing. This work was supported in part by the US National Institutes of Health-National Cancer Institute (G.D., no. R01 CA142636) and by a Department of Defense and Technology and Therapeutic Development Award (G.D., no. W81XWH-10-10425). L. Metelitsa kindly provided the CHLA-255 human NB cell line.
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G.D., I.C. and B.S. designed experiments; I.C., V.H., G.W. and E.S.K. performed the experiments; I.C., B.S. and G.D. analyzed the data; I.C. and G.D. wrote the manuscript; H.L. performed the statistical analysis; M.M.I. performed the pathology; D.M. provided his expertise in the heparanase field and provided crucial reagents; all the authors reviewed and approved the final version of the manuscript.
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G.D. and B.S. have ownership interest (including patents) in the field of T cell and gene-modified T cell therapy for cancer and have a collaborative research agreement with Celgene and Bluebird Bio.
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Caruana, I., Savoldo, B., Hoyos, V. et al. Heparanase promotes tumor infiltration and antitumor activity of CAR-redirected T lymphocytes. Nat Med 21, 524–529 (2015). https://doi.org/10.1038/nm.3833
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DOI: https://doi.org/10.1038/nm.3833
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