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Chimeric antigen receptor-induced BCL11B suppression propagates NK-like cell development

Marcel Maluski1, Arnab Ghosh2, Jessica Herbst1

  • 1Department of Pediatric Hematology/Oncology and Blood Stem Cell Transplantation, Hannover Medical School, Hannover, Germany.

The Journal of Clinical Investigation
|September 4, 2019
PubMed

Insights

Chimeric antigen receptor (CAR) expression in lymphoid progenitors suppressed BCL11B, creating CAR-induced killer (CARiK) cells. These CARiK cells demonstrated potent anti-leukemic activity in transplants, highlighting their immunotherapy potential.

Area of Science:

  • Immunology
  • Cell Biology
  • Cancer Research

Background:

  • The transcription factor B cell CLL/lymphoma 11B (BCL11B) is crucial for T cell development.
  • Understanding lymphoid progenitor differentiation is key for immunotherapy.

Purpose of the Study:

  • To investigate the impact of chimeric antigen receptor (CAR) expression on lymphoid progenitor differentiation.
  • To characterize the properties and therapeutic potential of CAR-expressing lymphoid progenitors.

Main Methods:

  • Ex vivo generation of lymphoid progenitors with CAR expression.
  • Analysis of BCL11B and T cell-associated gene expression.
  • Adoptive transfer into hematopoietic stem cell transplant recipients.
  • Assessment of CAR-induced killer (CARiK) cell activity and phenotype.

Main Results:

  • CAR expression suppressed BCL11B, leading to NK cell-like properties in progenitors.
  • CAR-expressing progenitors differentiated into CARiK cells with potent antigen-directed antileukemic activity.
  • CARiK cells were effective across MHC barriers and required CD28 and ITAMs for function.

Conclusions:

  • Synthetic CAR transgene expression drives unique lymphoid progenitor differentiation pathways.
  • Ex vivo-generated CARiK cells show promise for targeted immunotherapy against leukemia.
  • Further evaluation of CARiK cells is warranted for clinical applications.
Keywords:
ImmunologyImmunotherapyLeukemiasT cell developmentTransplantation

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