Abstract
Tumor hypoxia can decrease the efficacy of clinical therapy due to resistance toward radiation damage and chemotherapy, thus detection of tumor hypoxia by radiolabeled hypoxia markers is important for the control of tumor. Radiopharmaceuticals with two bioreductive groups, such as propylene amine oxime-bisnitroimidazole or monoamine-monoamide dithiol (MAMA) -bisnitroimidazole, have potential to improve hypoxia selectivity. In order to obtain radiopharmaceuticals with better features, we synthesized two novel [99mTcN]2+ complexes with bisnitroimidazole moieties and MAMA ligand for targeting tumor hypoxia. Their physicochemical characters and biodistribution were also investigated. Both the [99mTcN]2+ complexes show good stability and hydrophilicity. They show faster clearance from blood and soft tissues, better tumor retention and favorable tumor-to-tissue ratios compared with a control complex without nitroimidazole group. In addition, both of them show more favorable biodistribution patterns than the corresponding [99mTcO]3+ complexes. These results indicate that the 99mTcN-labeled MAMA-bisnitroimidazole complexes would have potential to image tumor hypoxia in vivo.
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Acknowledgments
The authors would like to thank Pr. Junbo Zhang for help of providing SDH kit. This work was supported by the National Science Foundation of China (Grant No. 21071010, 21371017).
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Lei Mei and Wenjing Sun contributed equally to this work.
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Mei, L., Sun, W. & Chu, T. Synthesis and biological evaluation of novel 99mTcN-labeled bisnitroimidazole complexes containing monoamine-monoamide dithiol as potential tumor hypoxia markers. J Radioanal Nucl Chem 301, 831–838 (2014). https://doi.org/10.1007/s10967-014-3235-6
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DOI: https://doi.org/10.1007/s10967-014-3235-6