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Noninvasive positron emission tomography imaging of cell death using a novel small-molecule probe, 18F labeled bis(zinc(II)-dipicolylamine) complex

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Abstract

The synthetic bis(zinc(II)-dipicolylamine) (DPAZn2) coordination complexes are known to have a high specific and selective affinity to target the exposed phosphatidylserine (PS) on the surface of dead and dying cells. An 18F-labeled DPAZn2 complex (4-18F-Fluoro-benzoyl-bis(zinc(II)-dipicolylamine), 18F-FB-DPAZn2) as positron emission tomography (PET) tracer was developed and evaluated for in vivo imaging of tumor treated with a chemical agent. The in vitro cell stain studies revealed that fluorescent DPAZn2 complexes (Dansyl-DPAZn2) stained the same cells (apoptotic and necrotic cells) as fluorescein isothiocyanate (FITC) labeled Annexin V (FITC-Annexin V). The radiosynthesis of 18F-FB-DPAZn2 was achieved through the amidation the precursor bis(2,2′-dipicolylamine) derivative (DPA2) with the prosthetic group N-succinimidyl-4-[18F]-fluorobenzoate (18F-SFB) and chelation with zinc nitrate. In the biodistribution study, the fast clearance of 18F-FB-DPAZn2 from blood and kidney was observed and high uptake in liver and intestine within 90 min postinjection was also found. For the PET imaging, significantly higher tumor uptake of 18F-FB-DPAZn2 was observed in the adriamycin (ADM)-treated Hepa1-6 hepatocellular carcinoma-bearing mice than that in the untreated tumor-model mice, while a slightly decreased tumor uptake of 18F-FDG was found in the ADM-treated tumor-bearing mice. The results indicate that 18F-FB-DPAZn2 has the similar capability of apoptosis detection as FITC-Annexin V and seems to be a potential PET tracer for noninvasive evaluation and monitoring of anti-tumor chemotherapy. The high uptake of 18F-FB-DPAZn2 in the abdomen needs to optimize the structure for improving its pharmacokinetics characteristics in the future work.

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Acknowledgments

The authors would like to thank Dr. Zhong Pei for his technical support and Dr. Xiangsong Zhang for his useful assistance. This work was supported by the National Natural Science Foundation (No. 81101076, No. 30970856, No. 81201116), Postdoctoral Science Foundation of China (20110490964), Science and Technology Planning Project of Guangdong Province, China (2010B031600054), Science and Technology Planning Project of Guangzhou (2011J5200025) and The Project Sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (No. [2010]609).

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Authors and Affiliations

  1. Department of Nuclear Medicine, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China

    Hongliang Wang, Ganghua Tang, Tingting Huang, Xiang Liang, Kongzhen Hu, Huaifu Deng, Chang Yi, Xinchong Shi & Kening Wu

  2. Department of Nuclear Medicine, The First Affiliated Hospital of Shanxi Medicical University, Taiyuan, 030001, China

    Hongliang Wang

  3. Department of Applied Chemistry, South China Agricultural University, Guangzhou, 510642, China

    Xiaolan Tang

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  1. Hongliang Wang
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  2. Xiaolan Tang
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  3. Ganghua Tang
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Correspondence to Ganghua Tang.

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Wang, H., Tang, X., Tang, G. et al. Noninvasive positron emission tomography imaging of cell death using a novel small-molecule probe, 18F labeled bis(zinc(II)-dipicolylamine) complex. Apoptosis 18, 1017–1027 (2013). https://doi.org/10.1007/s10495-013-0852-4

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