Improved radiosynthesis of 123 I-MAPi, an auger theranostic agent

I-MAPi, a novel PARP1-targeted Auger radiotherapeutic has shown promising results in pre-clinical glioma model. Currently, I-MAPi is synthesized using multistep synthesis that results in modest yields and low molar activities (MA) that limits the ability to translate this technology for human studie...

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Veröffentlicht in:International journal of radiation biology Jg. 99; H. 1; S. 70 - 76
Hauptverfasser: Wilson, Thomas C., Jannetti, Stephen A., Guru, Navjot, Pillarsetty, Nagavarakishore, Reiner, Thomas, Pirovano, Giacomo
Format: Journal Article
Sprache:Englisch
Veröffentlicht: England 02.01.2023
Schlagworte:
Electrons
Humans
Lung Neoplasms
Precision Medicine
Small Cell Lung Carcinoma
radiotherapy
Auger emitters
theranostics
PARP
ISSN:0955-3002, 1362-3095
Online-Zugang:Volltext
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Zusammenfassung:I-MAPi, a novel PARP1-targeted Auger radiotherapeutic has shown promising results in pre-clinical glioma model. Currently, I-MAPi is synthesized using multistep synthesis that results in modest yields and low molar activities (MA) that limits the ability to translate this technology for human studies where high doses are administered. Therefore, new methods are needed to synthesize I-MAPi in high activity yields (AY) and improved MA to facilitate clinical translation and multicenter trials. I-MAPi was prepared in a single step via I-iododetannylation of the corresponding tributylstannane precursor. In vitro internalization assay, subcellular fractionation and confocal microscopy where used to evaluate the performance of I-MAPi in a small cell lung cancer model. I-MAPi was synthesized in a single step from the corresponding stannane precursor in AY of 45 ± 2% and MA of 11.8 ± 4.8 GBq mol . In vitro in LX22 cells showed rapid internalization (5 min) with accumulation found predominantly in the membrane, nucleus and chromatin of the cell as determined by subcellular fractionation. Here, we have developed an improved radiosynthesis of I-MAPi, an Auger theranostic agent. This process was achieved using a single step, I-iododestannylation reaction from the corresponding stannane precursor in good AY and MA. I-MAPi was evaluated in vitro in a small cell lung cancer model with high PARP expression, rapid internalization and high nuclear uptake shown.
ISSN:0955-3002
1362-3095
DOI:10.1080/09553002.2020.1781283