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Lundmark F, Abouzayed A, Rinne SS, Timofeev V, Sipkina N, Naan M, Kirichenko A, Vasyutina M, Ryzhkova D, Tolmachev V, Rosenström U, Orlova A. Preclinical Characterisation of PSMA/GRPR-Targeting Heterodimer [ 68Ga]Ga-BQ7812 for PET Diagnostic Imaging of Prostate Cancer: A Step towards Clinical Translation. Cancers (Basel) 2023; 15:442. [PMID: 36672390 PMCID: PMC9856709 DOI: 10.3390/cancers15020442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 01/06/2023] [Accepted: 01/06/2023] [Indexed: 01/12/2023] Open
Abstract
The development of radioligands targeting prostate-specific membrane antigen (PSMA) and gastrin-releasing peptide receptor (GRPR) has shown promising results for the imaging and therapy of prostate cancer. However, studies have shown that tumors and metastases can express such targets heterogeneously. To overcome this issue and to improve protein binding, radioligands with the ability to bind both PSMA and GRPR have been developed. Herein, we present the preclinical characterization of [68Ga]Ga-BQ7812; a PSMA/GRPR-targeting radioligand for the diagnostic PET imaging of prostate cancer. This study aimed to evaluate [68Ga]Ga-BQ7812 to promote the translation of such imaging probes into the clinic. [68Ga]Ga-BQ7812 demonstrated rapid and specific binding to both targets in a PSMA/GRPR-expressing PC3-pip cell line. Results from the biodistribution study in PC3-pip xenografted mice showed specific binding to both targets, with the highest activity uptake at 1 h pi in tumor (PSMA+/GRPR+, 10.4 ± 1.0% IA/g), kidneys (PSMA+, 45 ± 16% IA/g), and pancreas (GRPR+, 5.6 ± 0.7% IA/g). At 3h pi, increased tumour-to-organ ratios could be seen due to higher retention in the tumor compared with other PSMA or GRPR-expressing organs. These results, together with low toxicity and an acceptable estimated dosimetry profile (total effective dose = 0.0083 mSv/MBq), support the clinical translation of [68Ga]Ga-BQ7812 and represent a step towards its first clinical trial.
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Affiliation(s)
- Fanny Lundmark
- Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden
| | - Ayman Abouzayed
- Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden
| | - Sara S. Rinne
- Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden
| | - Vasiliy Timofeev
- Personalized Medicine Centre, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Nadezhda Sipkina
- Personalized Medicine Centre, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Maria Naan
- Personalized Medicine Centre, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Anastasia Kirichenko
- Preclinical and Translational Research Centre, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Maria Vasyutina
- Preclinical and Translational Research Centre, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Daria Ryzhkova
- Department of Nuclear Medicine and Radiation Technology with Clinic, Almazov National Medical Research Centre, 2 Akkuratova Str., 197341 Saint Petersburg, Russia
| | - Vladimir Tolmachev
- Department of Immunology, Genetics and Pathology, Uppsala University, 751 23 Uppsala, Sweden
| | - Ulrika Rosenström
- Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden
| | - Anna Orlova
- Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden
- Science for Life Laboratory, Department of Medicinal Chemistry, Uppsala University, 751 23 Uppsala, Sweden
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Radiolabeled vitamins as the potential diagnostic probes for targeted tumor imaging. Bioorg Chem 2022; 122:105717. [DOI: 10.1016/j.bioorg.2022.105717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/26/2022] [Accepted: 03/01/2022] [Indexed: 11/18/2022]
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