期刊
JOURNAL OF NUCLEAR MEDICINE
卷 59, 期 10, 页码 1531-1537出版社
SOC NUCLEAR MEDICINE INC
DOI: 10.2967/jnumed.117.206714
关键词
Zr-89-oxine; positron emission tomography; chimeric antigen receptor T cells; prostate cancer; glioblastoma
资金
- National Cancer Institute of the National Institutes of Health [P30CA033572, R01FD005129]
- Prostate Cancer Foundation Challenge Award
- Gateway for Cancer Research [G-14-600]
- California Institute for Regenerative Medicine (CIRM) [TR3-05641]
Chimeric antigen receptor (CAR) T cell therapy is a promising clinical approach for reducing tumor progression and prolonging patient survival. However, improvements in both the safety and the potency of CAR T cell therapy demand quantitative imaging techniques to determine the distribution of cells after adoptive transfer. The purpose of this study was to optimize Zr-89-oxine labeling of CAR T cells and evaluate PET as a platform for imaging adoptively transferred CAR T cells. Methods: CAR T cells were labeled with 0-1.4 MBq of Zr-89-oxine per 106 cells and assessed for radioactivity retention, viability, and functionality. In vivo trafficking of Zr-89-oxine-labeled CAR T cells was evaluated in 2 murine xenograft tumor models: glioblastoma brain tumors with intracranially delivered IL13Ra2-targeted CAR T cells, and subcutaneous prostate tumors with intravenously delivered prostate stem cell antigen (PSCA)-targeted CAR T cells. Results: CAR T cells were efficiently labeled (75%) and retained more than 60% of the Zr-89 over 6 d. In vitro cytokine production, migration, and tumor cytotoxicity, as well as in vivo antitumor activity, were not significantly reduced when labeled with 70 kBq/106 cells. IL13Ra2-CAR T cells delivered intraventricularly were detectable by PET for at least 6 d throughout the central nervous system and within intracranial tumors. When intravenously administered, PSCA-CAR T cells also showed tumor tropism, with a 9-fold greater tumor-to-muscle ratio than for CAR-negative T cells. Conclusion: Zr-89-oxine can be used for labeling and imaging CAR T cells while maintaining cell viability and function. On the basis of these studies, we conclude that Zr-89-oxine is a clinically translatable platform for real-time assessment of cell therapies.
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