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Raitanen J, Barta B, Fuchs H, Hacker M, Balber T, Georg D, Mitterhauser M. Radiobiological Assessment of Targeted Radionuclide Therapy with [ 177Lu]Lu-PSMA-I&T in 2D vs. 3D Cell Culture Models. Int J Mol Sci 2023; 24:17015. [PMID: 38069337 PMCID: PMC10706939 DOI: 10.3390/ijms242317015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/27/2023] [Accepted: 11/28/2023] [Indexed: 12/18/2023] Open
Abstract
In vitro therapeutic efficacy studies are commonly conducted in cell monolayers. However, three-dimensional (3D) tumor spheroids are known to better represent in vivo tumors. This study used [177Lu]Lu-PSMA-I&T, an already clinically applied radiopharmaceutical for targeted radionuclide therapy against metastatic castrate-resistant prostate cancer, to demonstrate the differences in the radiobiological response between 2D and 3D cell culture models of the prostate cancer cell lines PC-3 (PSMA negative) and LNCaP (PSMA positive). After assessing the target expression in both models via Western Blot, cell viability, reproductive ability, and growth inhibition were assessed. To investigate the geometric effects on dosimetry for the 2D vs. 3D models, Monte Carlo simulations were performed. Our results showed that PSMA expression in LNCaP spheroids was highly preserved, and target specificity was shown in both models. In monolayers of LNCaP, no short-term (48 h after treatment), but only long-term (14 days after treatment) radiobiological effects were evident, showing decreased viability and reproductive ability with the increasing activity. Further, LNCaP spheroid growth was inhibited with the increasing activity. Overall, treatment efficacy was higher in LNCaP spheroids compared to monolayers, which can be explained by the difference in the resulting dose, among others.
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Affiliation(s)
- Julia Raitanen
- Ludwig Boltzmann Institute Applied Diagnostics, 1090 Vienna, Austria; (J.R.)
- Department of Biomedical Imaging and Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria
- Vienna Doctoral School of Chemistry (DoSChem), University of Vienna, 1090 Vienna, Austria
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
| | - Bernadette Barta
- Ludwig Boltzmann Institute Applied Diagnostics, 1090 Vienna, Austria; (J.R.)
| | - Hermann Fuchs
- Department of Radiation Oncology, Division of Medical Radiation Physics, Medical University of Vienna, 1090 Vienna, Austria
| | - Marcus Hacker
- Department of Biomedical Imaging and Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria
| | - Theresa Balber
- Ludwig Boltzmann Institute Applied Diagnostics, 1090 Vienna, Austria; (J.R.)
- Department of Biomedical Imaging and Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria
- Joint Applied Medicinal Radiochemistry Facility, Medical University of Vienna, University of Vienna, 1090 Vienna, Austria
| | - Dietmar Georg
- Department of Radiation Oncology, Division of Medical Radiation Physics, Medical University of Vienna, 1090 Vienna, Austria
| | - Markus Mitterhauser
- Ludwig Boltzmann Institute Applied Diagnostics, 1090 Vienna, Austria; (J.R.)
- Department of Biomedical Imaging and Image-Guided Therapy, Division of Nuclear Medicine, Medical University of Vienna, 1090 Vienna, Austria
- Institute of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
- Joint Applied Medicinal Radiochemistry Facility, Medical University of Vienna, University of Vienna, 1090 Vienna, Austria
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