Synthesis, Radiolabeling and Biological Evaluation of Propylene Amine Oxime Complexes Containing Nitrotriazoles as Hypoxia Markers
作者:Huafan Huang、Lei Mei、Taiwei Chu
DOI:10.3390/molecules17066808
日期:——
Two propylene amine oxime (PnAO) complexes, 1, containing a 3-nitro-1,2,4-triazole and 2, containing two 3-nitro-1,2,4-triazoles, were synthesized and radiolabeled with 99mTc in high labeling yields. Cellular uptakes of 99mTc-1 and 99mTc-2 were tested using a S180 cells line. Under anoxic conditions, the cellular uptakes of 99mTc-1 and 99mTc-2 were 33.7 ± 0.2% and 35.0 ± 0.7% at 4 h, whereas the normoxic uptakes of the two complexes were 6.0 ± 1.6% and 4.6 ± 0.9%, respectively. Both 99mTc-1 and 99mTc-2 displayed significant anoxic/normoxic differentials. The cellular uptakes were highly dependent on oxygen and temperature. Biodistribution studies revealed that both 99mTc-1 and 99mTc-2 showed a selective localization in tumor and slow clearance from it. At 4 h, the tumor-to-muscle ratios (T/M) were 3.79 for 99mTc-1 and 4.58 for 99mTc-2. These results suggested that 99mTc-labeled PnAO complexes 99mTc-1 and 99mTc-2 might serve as novel hypoxia markers. By introducing a second nitrotriazole redox center, the hypoxic accumulation of the marker was slightly enhanced.
合成了两种丙烯胺肟(PnAO)配合物,1包含一个3-硝基-1,2,4-三唑,2则包含两个3-硝基-1,2,4-三唑,并以高标记率与99mTc进行了放射性标记。使用S180细胞系测试了99mTc-1和99mTc-2的细胞摄取。在缺氧条件下,99mTc-1和99mTc-2的细胞摄取率在4小时内分别为33.7 ± 0.2%和35.0 ± 0.7%,而在常氧条件下,两种配合物的摄取率分别为6.0 ± 1.6%和4.6 ± 0.9%。两者显示出显著的缺氧/常氧差异。细胞摄取对氧气和温度高度依赖。生物分布研究表明,99mTc-1和99mTc-2均在肿瘤中具有选择性定位,并从肿瘤中缓慢清除。4小时后,肿瘤与肌肉的比率(T/M)分别为99mTc-1的3.79和99mTc-2的4.58。这些结果表明,99mTc标记的PnAO配合物99mTc-1和99mTc-2可能作为新型缺氧标记物。通过引入第二个硝基三唑氧化还原中心,标记物在缺氧中的积累略有增强。