Targeted elimination of prostate cancer by genetically directed human T lymphocytes

Terence P.F. Gade, Waleed Hassen, Elmer Santos, Gertrude Gunset, Aurore Saudemont, Michael C. Gong, Renier Brentjens, Xiao Song Zhong, Matthias Stephan, Jolanta Stefanski, Clay Lyddane, Joseph R. Osborne, Ian M. Buchanan, Simon J. Hall, Warren D. Heston, Isabelle Rivière, Steven M. Larson, Jason A. Koutcher, Michel Sadelain

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

The genetic transfer of antigen receptors is a powerful approach to rapidly generate tumor-specific T lymphocytes. Unlike the physiologic T-cell receptor, chimeric antigen receptors (CARs) encompass immunoglobulin variable regions or receptor ligands as their antigen recognition moiety, thus permitting T cells to recognize tumor antigens in the absence of human leukocyte antigen expression. CARs encompassing the CD3Cζ chain as their activating domain induce T-cell proliferation in vitro, but limited survival. The requirements for genetically targeted T cells to function in vivo are less well understood. We have, therefore, established animal models to assess the therapeutic efficacy of human peripheral blood T lymphocytes targeted to prostate-specific membrane antigen (PSMA), an antigen expressed in prostate cancer cells and the neovasculature of various solid tumors. In vivo specificity and antitumor activity were assessed in mice bearing established prostate adenocarcinomas, using serum prostate-secreted antigen, magnetic resonance, computed tomography, and bioluminescence imaging to investigate the response to therapy. In three tumor models, orthotopic, s.c., and pulmonary, we show that PSMA-targeted T cells effectively eliminate prostate cancer. Tumor eradication was directly proportional to the in vivo effector-to-tumor cell ratio. Serial imaging further reveals that the T cells must survive for at least 1 week to induce durable remissions. The eradication of xenogeneic tumors in a murine environment shows that the adoptively transferred T cells do not absolutely require in vivo costimulation to function. These results thus provide a strong rationale for undertaking phase I clinical studies to assess PSMA-targeted T cells in patients with metastatic prostate cancer.

Original languageEnglish
Pages (from-to)9080-9088
Number of pages9
JournalCancer Research
Volume65
Issue number19
DOIs
StatePublished - 1 Oct 2005
Externally publishedYes

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