Preparation and Biodistribution of Technetium-99m-Labeled Bis- Misonidazole (MISO) as an Imaging Agent for Tumour Hypoxia
作者:Feng Wang、Di Fan、Jun Qian、Zhe Zhang、Jianhua Zhu、Jian Chen
DOI:10.2174/1573406411666150504124103
日期:2015.9.22
Diagnosis of tumour hypoxia is an important aspect in determining the
course of tumour therapy. In this study, we developed a novel imaging agent, 99mTcethylenedicysteine-
bis-misonidazole (99mTc-EC-MISO), for diagnosing tumour hypoxia.
We used 2-nitroimidazole as a reactant to synthesize the amino derivative of
misonidazole (MISO) in the first step and then conjugated the di-amino derivative of
MISO to the chelating agent ethylenedicysteine (EC) for labelling 99mTc in the second
step. 99mTc-pertechnetate (99mTcO4
-) was reduced by tin chloride (SnCl2) for radiolabeling.
The radiochemical purity was up to 94%. Tissue biodistribution and SPECT/CT imaging studies were conducted
on subcutaneous gliomal tumour-bearing mice. The tumour-to-muscle ratio in the 99mTc-EC-MISO group increased with
time, up to 4.6 at 4 h after injection. SPECT/CT imaging confirmed that the tumours could be visualized clearly with
99mTc-EC-MISO at 2 h. By introducing a second 2-nitroimidazole redox centre, an apparent hypoxic accumulation of this
novel 99mTc-labeled imaging agent in the tumour was observed.
肿瘤缺氧的诊断是确定肿瘤缺氧的重要方面
肿瘤治疗过程。在这项研究中,我们开发了一种新型显像剂,99mTcethylenedicysteine-
双米索硝唑 (99mTc-EC-MISO),用于诊断肿瘤缺氧。
我们以2-硝基咪唑为反应物合成了氨基衍生物
第一步是米索硝唑(MISO),然后缀合二氨基衍生物
MISO 以螯合剂乙二半胱氨酸 (EC) 标记 99mTc 在第二步
步。 99mTc-高锝酸盐 (99mTcO4
-) 通过氯化锡 (SnCl2) 还原进行放射性标记。
放射化学纯度高达94%。进行了组织生物分布和 SPECT/CT 成像研究
在皮下携带神经胶质瘤的小鼠上。 99mTc-EC-MISO 组的肿瘤与肌肉比率随着
注射后 4 小时达到 4.6。 SPECT/CT 成像证实肿瘤可以通过
99mTc-EC-MISO 2 小时。通过引入第二个 2-硝基咪唑氧化还原中心,这种明显的缺氧积累
在肿瘤中观察到新型 99mTc 标记显像剂。