Abstract
Purpose
This study focusses on a promising carrier system for therapeutic and imaging purposes using meso-tetrakis[3,4-bis(carboxymethyleneoxy)phenyl] porphyrin (T3,4CPP). To assess its potential for clinical use, we labelled T3,4CPP with 188Re and analysed some kinetic biodistribution parameters after intravenous injection in mice.
Materials and methods
T3,4CPP was synthesized and labelled with 188Re. Normal Kunming (KM) mice and melanoma- or hepatoma-bearing BALB/c nude mice were injected intravenously with 5.55 MBq 188Re-labelled T3,4CPP and sacrificed at 0.5, 2, 4, and 24 h and 8, and 24 h, respectively.
Results
The 188Re-T3,4CPP yield was more than 95% with specific activity 16.9 GBq (mol)−1, and Vitamin C (VC) could increase its stability in vitro. In normal KM mice, 188Re-T3,4CPP had fast blood clearance (~99%, 24 h postinjection), low retention in the vital organs and hepatotropic characteristics. In nude mice, more than 4.4 and 6.1% uptake per gram of tumour (%ID g−1) at 8 h postinjection was in melanoma and hepatoma, respectively; this remained as high levels after 24 h as 4.6 and 6.5%, respectively. At 8 h, the tumour/blood and tumour/muscle (T/M) ratios in melanomas and hepatoma bearing mice were 7.3, 13,and 7.0, 20, respectively. Twenty-four hours later, these high ratios still continued in existence which were 9.6, 19 and 10, 25, respectively.
Conclusion
The results obtained in this study indicate that 188Re-T3,4CPP has better tumour affinity and retainable accumulation characteristics in carcinoma which can potentially be used for tumour-targeted radiotherapy.
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Acknowledgements
The authors are thankful to Miss Yu-qing YANG, Xiao-kun WANG and Mr. Ye-bing LIU (Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, People’s Republic of China) for sample tests and measurements and keen help in radiochemical experiment. The authors also wish to thank Miss Hai-zhen ZHU (MA in Southwest University for Nationalities, People’s Republic China) for her kind support and encouragement in the processing of this paper.
Declaration
The experiments comply with the current laws of China in which we performed inclusive of ethics approval.
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Jia, Zy., Deng, Hf., Pu, Mf. et al. Rhenium-188 labelled meso-tetrakis[3,4-bis(carboxymethyleneoxy)phenyl] porphyrin for targeted radiotherapy: preliminary biological evaluation in mice. Eur J Nucl Med Mol Imaging 35, 734–742 (2008). https://doi.org/10.1007/s00259-007-0682-0
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DOI: https://doi.org/10.1007/s00259-007-0682-0