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Cullin-5 deficiency promotes chimeric antigen receptor T cell effector functions potentially via the modulation of

Yoshitaka Adachi1, Seitaro Terakura2, Masahide Osaki3

  • 1Department of Hematology and Oncology, Nagoya University Graduate School of Medicine, Nagoya, Japan. yadachi@umich.edu.

Nature Communications
|December 10, 2024
PubMed

Insights

Genetic ablation of CUL5 enhances chimeric antigen receptor (CAR) T cell therapy. Knocking out CUL5 improves CAR T cell expansion and effector functions, boosting cancer immunotherapy outcomes.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • Chimeric antigen receptor (CAR) T cell therapy shows promise for cancer treatment.
  • Identifying factors to enhance CAR T cell efficacy is crucial for improving patient outcomes.

Purpose of the Study:

  • To identify genes regulating CAR T cell proliferation and survival using genome-wide CRISPR screening.
  • To investigate the role of CUL5 in CAR T cell function and therapeutic potential.

Main Methods:

  • Genome-wide CRISPR screening was employed to identify genes affecting CAR T cell function.
  • CUL5 was genetically ablated in human CD19 CAR T cells.
  • JAK/STAT pathway activation and protein degradation were analyzed.
  • In vivo studies utilized shRNA-mediated knockdown of CUL5 in tumor-bearing mice.

Main Results:

  • Genetic ablation of CUL5 significantly enhanced human CD19 CAR T cell expansion and effector functions.
  • CUL5 knockout CAR T cells exhibited sustained STAT3 and STAT5 phosphorylation.
  • Delayed phosphorylation and degradation of JAK1 and JAK3 were observed in CUL5-deficient CAR T cells.
  • CUL5 knockdown in vivo improved CD19 CAR T treatment outcomes in mice.

Conclusions:

  • Targeting CUL5 within the ubiquitin system can enhance CAR T cell effector functions.
  • CUL5 modulation represents a potential strategy to improve the efficacy of CAR T cell immunotherapy for cancer treatment.

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