Preliminary Biological Evaluation of 18F-FBEM-Cys-Annexin V a Novel Apoptosis Imaging Agent

Molecules

Chunxiong Lu¹  Quanfu Jiang¹  Minjin Hu²  Cheng Tan¹  Huixin Yu¹  Zichun Hua² 

[1] Ministry of Health & Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China; E-Mails:;Jiangsu Target Pharma Laboratories Inc., Changzhou High-Tech Research Institute of Nanjing University, Changzhou 213164, China; E-Mail:

关键词: Cys-Annexin V;    site-specific labeling;    ¹⁸F-FBEM;    apoptosis imaging;   

DOI  :  10.3390/molecules20034902

来源: mdpi

【 摘 要 】

A novel annexin V derivative (Cys-Annexin V) with a single cysteine residue at its C-terminal has been developed and successfully labeled site-specifically with ¹⁸F-FBEM. ¹⁸F-FBEM was synthesized by coupling ¹⁸F-fluorobenzoic acid (¹⁸F-FBA) with N-(2-aminoethyl)maleimide using optimized reaction conditions. The yield of ¹⁸F-FBEM-Cys-Annexin V was 71.5% ± 2.0% (n = 4, based on the starting ¹⁸F-FBEM, non-decay corrected). The radiochemical purity of ¹⁸F-FBEM-Cys-Annexin V was >95%. The specific radioactivities of ¹⁸F-FBEM and ¹⁸F-FBEM-Cys-Annexin V were >150 and 3.17 GBq/µmol, respectively. Like the 1st generation ¹⁸F-SFB-Annexin V, the novel ¹⁸F-FBEM-Cys-Annexin V mainly shows renal and to a lesser extent, hepatobiliary excretion in normal mice. In rat hepatic apoptosis models a 3.88 ± 0.05 (n = 4, 1 h) and 10.35 ± 0.08 (n = 4, 2 h) increase in hepatic uptake of ¹⁸F-FBEM-Cys-Annexin V compared to normal rats was observed after injection via the tail vein. The liver uptake ratio (treated/control) at 2 h p.i. as measured via microPET correlated with the ratio of apoptotic nuclei in liver observed using TUNEL histochemistry, indicating that the novel ¹⁸F-FBEM-Cys-Annexin V is a potential apoptosis imaging agent.

【 授权许可】

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