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Preparation of two 99mTc(CO)3 labelled complexes with a 4-nitroimidazole isocyanide at different temperatures for molecular imaging of tumor hypoxia

  • Qing Ruan
  • Xuran Zhang
  • Qianqian Gan
  • Si’an Fang
  • Junbo ZhangEmail author
Article

Abstract

A 4-nitroimidazole isocyanide derivative (6) was synthesized and radiolabelled with 99mTc(CO)3 core in high yield. It was interesting to note that 99mTc(CO)3-6a and 99mTc(CO)3-6b can be prepared at 100 °C and 25 °C, respectively. 99mTc(CO)3-6a had three 6 molecules while 99mTc(CO)3-6b contained two 6 molecules. The corresponding rhenium complexes were prepared to confirm the structure of the 99mTc complexes. Both complexes showed good stability in vitro and hypoxic selectivity. The partition coefficient results indicated both of them were hydrophilic and 99mTc(CO)3-6a was more hydrophilic than 99mTc(CO)3-6b. From the biodistribution study results, 99mTc(CO)3-6a showed higher tumor/blood and tumor/muscle ratios at 2 h post-injection. Further, single photon emission computed tomography (SPECT) imaging study of 99mTc(CO)3-6a showed there was an observable tumor uptake, suggesting it would be a potential tracer for imaging of tumor hypoxia.

Keywords

4-nitroimidazole 99mTc Tumor Hypoxia SPECT imaging 

Notes

Acknowledgements

This work was financially supported, in part, by the National Natural Science Foundation of China (21771023) and the project of Beijing Municipal Science and Technology Commission (Z181100002218033).

Supplementary material

10967_2019_7005_MOESM1_ESM.doc (608 kb)
Supplementary material 1 (DOC 608 kb)

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2020

Authors and Affiliations

  1. 1.Key Laboratory of Radiopharmaceuticals of Ministry of Education, College of ChemistryBeijing Normal UniversityBeijingPeople’s Republic of China

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