Abstract
Purpose
To develop a prostate-specific membrane antigen (PSMA)-targeted radiotherapeutic for metastatic castration-resistant prostate cancer (mCRPC) with optimized efficacy and minimized toxicity employing the β-particle radiation of 177Lu.
Methods
We synthesized 14 new PSMA-targeted, 177Lu-labeled radioligands (177Lu-L1–177Lu-L14) using different chelating agents and linkers. We evaluated them in vitro using human prostate cancer PSMA(+) PC3 PIP and PSMA(−) PC3 flu cells and in corresponding flank tumor models. Efficacy and toxicity after 8 weeks were evaluated at a single administration of 111 MBq for 177Lu-L1, 177Lu-L3, 177Lu-L5 and 177Lu-PSMA-617. Efficacy of 177Lu-L1 was further investigated using different doses, and long-term toxicity was determined in healthy immunocompetent mice.
Results
Radioligands were produced in high radiochemical yield and purity. Cell uptake and internalization indicated specific uptake only in PSMA(+) PC3 cells. 177Lu-L1, 177Lu-L3 and 177Lu-L5 demonstrated comparable uptake to 177Lu-PSMA-617 and 177Lu-PSMA-I&T in PSMA-expressing tumors up to 72 h post-injection. 177Lu-L1, 177Lu-L3 and 177Lu-L5 also demonstrated efficient tumor regression at 8 weeks. 177Lu-L1 enabled the highest survival rate. Necropsy studies of the treated group at 8 weeks revealed subacute damage to lacrimal glands and testes. No radiation nephropathy was observed 1 year post-treatment in healthy mice receiving 111 MBq of 177Lu-L1, most likely related to the fast renal clearance of this agent.
Conclusions
177Lu-L1 is a viable clinical candidate for radionuclide therapy of PSMA-expressing malignancies because of its high tumor-targeting ability and low off-target radiotoxic effects.
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Abbreviations
- PC:
-
Prostate cancer
- SAR:
-
Structure–activity relationships
- PSMA:
-
Prostate-specific membrane antigen
- DCIBzL:
-
2-[3-[1-Carboxy-5-(4-(125)I-iodo-benzoylamino)-pentyl]-ureido]-pentanedioic acid
- PET:
-
Positron emission tomography
- SPECT:
-
Single-photon emission computed tomography.
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Acknowledgments
We would like to thank Dr. R. Mease for his helpful comments.
Funding
We are grateful for the following sources of support: K25 CA148901 and the Patrick C. Walsh Prostate Cancer Research Fund (SRB), CA134675, CA184228, EB024495, and the Commonwealth Foundation (MGP).
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Drs. Banerjee and Pomper are co-inventors on one or more U.S. patents covering compounds discussed in this submission, and as such are entitled to a portion of any licensing fees and royalties generated by this technology. This arrangement has been reviewed and approved by the Johns Hopkins University in accordance with its conflict-of-interest policies. No other authors have declared any relevant conflicts of interest.
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All animal studies were carried out in compliance with the regulations of the Johns Hopkins Animal Care and Use Committee.
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Banerjee, S.R., Kumar, V., Lisok, A. et al. 177Lu-labeled low-molecular-weight agents for PSMA-targeted radiopharmaceutical therapy. Eur J Nucl Med Mol Imaging 46, 2545–2557 (2019). https://doi.org/10.1007/s00259-019-04434-0
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DOI: https://doi.org/10.1007/s00259-019-04434-0