Anti-CD19 CAR T cells potently redirected to kill solid tumor cells

Christine Ambrose, Lihe Su, Lan Wu, Fay J. Dufort, Thomas Sanford, Alyssa Birt, Benjamin J. Hackel, Andreas Hombach, Hinrich Abken, Roy R. Lobb, Paul D. Rennert

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Successful CAR T cell therapy for the treatment of solid tumors requires exemplary CAR T cell expansion, persistence and fitness, and the ability to target tumor antigens safely. Here we address this constellation of critical attributes for successful cellular therapy by using integrated technologies that simplify development and derisk clinical translation. We have developed a CAR-CD19 T cell that secretes a CD19-anti-Her2 bridging protein. This cell therapy strategy exploits the ability of CD19-targeting CAR T cells to interact with CD19 on normal B cells to drive expansion, persistence and fitness. The secreted bridging protein potently binds to Her2-positive tumor cells, mediating CAR-CD19 T cell cytotoxicity in vitro and in vivo. Because of its short half-life, the secreted bridging protein will selectively accumulate at the site of highest antigen expression, ie. at the tumor. Bridging proteins that bind to multiple different tumor antigens have been created. Therefore, antigen-bridging CARCD19 T cells incorporate critical attributes for successful solid tumor cell therapy. This platform can be exploited to attack tumor antigens on any cancer.

Original languageEnglish (US)
Article numbere0247701
JournalPloS one
Issue number3 March
StatePublished - Mar 2021

Bibliographical note

Publisher Copyright:
Copyright: © 2021 Ambrose et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


  • Animals
  • Antigens, CD19/genetics
  • B-Lymphocytes/immunology
  • Cell Line, Tumor
  • Cell Proliferation
  • Coculture Techniques
  • Cytotoxicity, Immunologic
  • ErbB Receptors/genetics
  • Gene Expression
  • Genetic Vectors/immunology
  • Humans
  • Immunotherapy, Adoptive/methods
  • Lentivirus/genetics
  • Lymphocyte Activation
  • Lymphoma, B-Cell/genetics
  • Mice
  • Mice, SCID
  • Protein Binding
  • Receptor, ErbB-2/genetics
  • Receptors, Chimeric Antigen/genetics
  • T-Lymphocytes/cytology
  • Treatment Outcome
  • Xenograft Model Antitumor Assays

PubMed: MeSH publication types

  • Research Support, Non-U.S. Gov't
  • Journal Article


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