The Art and Science of Selecting a CD123-Specific Chimeric Antigen Receptor for Clinical Testing

Janice M. Riberdy, Sheng Zhou, Fei Zheng, Young In Kim, Jennifer Moore, Abishek Vaidya, Robert E. Throm, April Sykes, Natasha Sahr, Challice L. Bonifant, Byoung Ryu, Stephen Gottschalk, Mireya Paulina Velasquez

Research output: Contribution to journalArticlepeer-review

Abstract

Chimeric antigen receptor (CAR) T cells targeting CD123, an acute myeloid leukemia (AML) antigen, hold the promise of improving outcomes for patients with refractory/recurrent disease. We generated five lentiviral vectors encoding CD20, which may serve as a target for CAR T cell depletion, and 2nd or 3rd generation CD123-CARs since the benefit of two costimulatory domains is model dependent. Four CARs were based on the CD123-specific single-chain variable fragment (scFv) 26292 (292) and one CAR on the CD123-specific scFv 26716 (716), respectively. We designed CARs with different hinge/transmembrane (H/TM) domains and costimulatory domains, in combination with the zeta (z) signaling domain: 292.CD8aH/TM.41BBz (8.41BBz), 292.CD8aH/TM.CD28z (8.28z), 716.CD8aH/TM.CD28z (716.8.28z), 292.CD28H/TM. CD28z (28.28z), and 292.CD28H/TM.CD28.41BBz (28.28.41BBz). Transduction efficiency, expansion, phenotype, and target cell recognition of the generated CD123-CAR T cells did not significantly differ. CAR constructs were eliminated for the following reasons: (1) 8.41BBz CARs induced significant baseline signaling, (2) 716.8.28z CAR T cells had decreased anti-AML activity, and (3) CD28.41BBz CAR T cells had no improved effector function in comparison to CD28z CAR T cells. We selected the 28.28z CAR since CAR expression on the cell surface of transduced T cells was higher in comparison to 8.28z CARs. The clinical study (NCT04318678) evaluating 28.28z CAR T cells is now open for patient accrual.

Original languageEnglish (US)
Pages (from-to)571-581
Number of pages11
JournalMolecular Therapy - Methods and Clinical Development
Volume18
DOIs
StatePublished - Sep 11 2020

Keywords

  • AML
  • CAR
  • CD123
  • T cell therapy
  • chimeric antigen receptor
  • immunotherapy
  • leukemia

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology
  • Genetics

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