Abstract
68Ga-radiolabeled small molecules targeting prostate-specific membrane antigen (PSMA) have been extensively investigated as 68Ga-positron emission tomography (68Ga-PET) tracers. Nevertheless, current 68Ga-labeled radiotracers suffer from either fair detection rates for metastatic prostate cancer lesions or a high uptake by the kidneys. This study synthesizes new PSMA-targeted radiotracers, [68Ga]SC691-DOTA, [68Ga]SC691-NOTA, and [68Ga]SC691-HBEDCC, and explores the in vitro and in vivo properties. These three radiotracers enabled PSMA-positive LNCaP tumors to be visualized by micro-PET/CT as early as 5 min post-injection. Biodistribution studies revealed that all three compounds could accumulate in the tumor with high affinity. The kidney’s uptake of [68Ga]SC691-DOTA and [68Ga]SC691-NOTA was comparable but lower than [68Ga]SC691-HBEDCC. [68Ga]SC691-HBEDCC demonstrated the most increased uptake and retention in the tumor over 2 h post-injection and a lower tumor-to-tissue ratio than [68Ga]SC691-DOTA, and [68Ga]SC691-NOTA.
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Acknowledgements
The authors would like to thank the National Natural Science Foundation of China for funding this work (U20A20384); the Doctoral Research Initiation Fund of Affiliated Hospital of Southwest Medical University; Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province (HYX19001), the Sichuan Science and Technology Foundation (2021YJ0131 and 2020ZYD101), and Luzhou-Southwest Medical University Cooperative Application Foundation (2020LZXNYDJ50)
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Conceptualization: ZZ. Methodology: ZZ, NL, YL. Validation: YL, LX. Formal analysis: ZZ, YL. Investigation: YL, LX, PC, YW, YF, WZ. Resources: YC, WZ. Data curation: YL, LX. Writing: ZZ. Funding acquisition: YC, ZZ, WZ. Review: ZZ, YL, LX, PC, YW, YF, WZ, YC, NL.
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Institutional Review Board Statement: The Ethics Committee for Southwest Medical University (2021-02-29) approved the study. All methods were carried out following relevant guidelines and regulations, and all methods are reported per ARRIVE guidelines.
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Liu, Y., Xia, L., Cai, P. et al. In vitro and in vivo comparative study of 68Ga-labeled DOTA-, NOTA-, and HBEDCC-chelated radiotracers targeting prostate-specific membrane antigen. J Radioanal Nucl Chem 332, 617–628 (2023). https://doi.org/10.1007/s10967-022-08731-1
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DOI: https://doi.org/10.1007/s10967-022-08731-1