99TcmO标记的不同链长MAG3-2-硝基咪唑乏氧显像剂在肉瘤鼠体内的生物分布  被引量:1

Biodistribution of 99TcmO-labeled MAG3-2-nitroimidazole hypoxia imaging agents with different spacers in S180 scarcoma-bearing mice

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作  者:梅雷[1] 杨志[2] 褚泰伟[1] 

机构地区:[1]北京大学化学与分子工程学院放射化学与辐射化学重点学科实验室、北京分子科学国家实验室,100871 [2]北京大学肿瘤医院暨北京市肿瘤防治研究所核医学科、恶性肿瘤发病机制及转化研究教育部重点实验室,100142

出  处:《中华核医学与分子影像杂志》2017年第1期25-30,共6页Chinese Journal of Nuclear Medicine and Molecular Imaging

基  金:国家自然科学基金(81371592,21371017)

摘  要:目的探讨99TcmO标记的不同链长的MAG3-2-硝基咪唑乏氧显像剂性能。 方法制备4个带有不同长度侧链的MAG3-2-硝基咪唑化合物BzMAG3-2NIEA(1)、BzMAG3-2NIPA(2),BzMAG3-2NIHA(3)和BzMAG3-2NIUA(4),并对其进行99TcmO标记。将4个化合物分别注射于5只荷S180肉瘤鼠体内,观察其在生物体内的分布情况。采用两样本t检验处理数据。 结果制备的4个99TcmO-MAG3标记物稳定性均较高,带负电荷,脂溶性随链长增加呈增加趋势。生物分布实验表明,注射后2 h中短碳链99TcmO-1和99TcmO-2肿瘤摄取较高,分别为(0.67±0.18)和(0.65±0.18) %ID/g;长碳链的99TcmO-3和99TcmO-4肿瘤摄取较低,分别为(0.19±0.03)和(0.39±0.05) %ID/g(t=2.78~5.88,均P〈0.05)。 结论标记物连接基团的链长结构对99TcmO标记MAG3-2-硝基咪唑类化合物的理化性质与乏氧靶向性有显著影响,以中短碳链的乏氧选择性最好。Objective To evaluate the hypoxia selectivity of 99TcmO-labeld MAG3-nitroimidazole complexes with different spacers. Methods Four kinds of 99TcmO-labeled MAG3-2-nitroimidazole hypoxia imaging agents with different spacers were synthesized and radiolabeled. The stability and lipid solubility of BzMAG3-2NIEA ( 1 ), BzMAG3-2NIPA ( 2), BzMAG3-2NIHA ( 3 ) and BzMAG3-2NIUA (4) were measured. The uptake was investigated by biodistribution experiment using S180-bearing mice. Two-sample t test was used for statistical analysis. Results All 4 99TcmO-MAG3 complexes were stable and negatively charged, showing an increasing trend in fat solubility with the increase of spacer length. In biodistribution study, tumor uptake of 99TcmO-1 and 99TcmO-2 with medium- and short-carbon chain were (0.67±0. 18) and (0. 65±0.18) %ID/g 2 h post injection, which were (0.19±0.03) and (0.39±0.05) %ID/g for 99TcmO-3 and 99TcmO-4 with long-carbon chain (t= 2.78-5.88, all P〈0.05). Conclusion Molecular structure of spacers has a significant effect on the physicochemical properties and tumor targeting of 99TcmO-labeled MAG3-2-nitroimidazole hypoxia imaging agents, such that the medium and short-carbon chain spacers show the best hypoxia-selective property.

关 键 词:硝基咪唑类 同位素标记  肉瘤 放射性核素显像 小鼠 

分 类 号:R730.44[医药卫生—肿瘤] R738.7[医药卫生—临床医学]

 

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