Cholchicine and its derivatives are very potent tubulin-binding compounds and can be used as a potential tumor targeting agents. In this study, colchicine was labeled with 99mTc via hydrazinonicotinic acid (HYNIC) and was investigated further. HYNIC/cholchicine was synthesized and labeling with 99mTc was performed at 95 °C for 15 min and radiochemical analysis included HPLC method. The stability of radiconjugate was checked in the presence of human serum at 37 °C up to 24 h. Biodistribution was studied in breast tumor-bearing mice. Labeling yield of 95.8 ± 0.54% was obtained corresponding to a specific activity of 54 MBq/µmol. Radioconjugate showed good stability in the presence of human serum. Biodistribution studies in tumor-bearing mice showed that 99mTc/HYNIC/colchicine conjugate accumulated in tumor with good uptake (3.17 ± 0.14% g/g at 1 h post-injection). The radioconjugate was cleared fast from normal organs and showed clearance through urinary and hepatobiliary systems with accumulation of activity in kidneys and intestine. This radioconjugate may be useful to assess the presence of tumor by imaging.
秋水仙碱及其衍
生物是非常有效的微管蛋白结合化合物,可用作潜在的肿瘤靶向剂。在本研究中,
秋水仙碱通过
肼基
烟酸(HYNIC)标记了99mTc,并进一步进行了研究。合成了HYNIC/
秋水仙碱并在95°C下进行15分钟的99mTc标记,放射
化学分析包括HPLC方法。在37°C下,在人血清存在下检查了放射性偶联物的稳定性,最长可达24小时。在携带乳腺癌的小鼠中研究了
生物分布。获得了95.8±0.54%的标记产率,对应于54MBq/µmol的特定活性。放射性偶联物在人血清存在下显示出良好的稳定性。在肿瘤携带的小鼠中进行的
生物分布研究表明,99mTc/HYNIC/
秋水仙碱偶联物在肿瘤中积累,摄取良好(注射后1小时为3.17±0.14% g/g)。放射性偶联物从正常器官中快速清除,并通过泌尿和肝胆系统清除,在肾脏和肠道中积累活性。这种放射性偶联物可能有助于通过成像评估肿瘤的存在。