摘要
合成了一种新的含甲硝唑药效团的双功能配体:2-[3-(2-甲基-5-硝基咪唑基)丙酰胺基]-3-巯基丙酸(MN-cys-OS),并与[99mTcN]i2nt+中间体反应,制备得到一种99mTcN核标记的混配配合物:99mTcN(PNP5)(MN-cys-OS),其标记率大于95%.研究表明99mTcN(PNP5)(MN-cys-OS)为电中性、脂溶性配合物(P=3.17±0.06),具有较好的体外稳定性.正常昆明小鼠体内生物分布研究结果显示该配合物具有很快的肝、血清除性能,进一步的荷MA891肿瘤小鼠研究显示其具有一定的乏氧选择性,但肿瘤摄取较低.
A novel metronidazole derivative, 2-E 3-(2-methyl-5-nitro-lH-imidazolyl) sulfhydry-propionic acid (MN-cys-OS), was synthesized as a pharmacophore-containing propionylamino 1-3 bifunctional ligand. The corresponding asymmetrical ^99mTc nitrodo complex, 99mTcN (PNPS) (MN-cys-OS), a potential tumor hypoxia marker, was prepared in high yield (〉95%) through [^99mTcN]int^2+ precursor. ^99mTcN(PNPS)(MN-cys- OS) was found to be lipophilic (P=3.17±0. 06) and electroneutral, with good stability. The complex had fast clearance from liver and blood in normal Kunming mice, but displayed specific accumulation in hypoxic foci, with a low tumor uptake in MA 891 tumor-bearing mice.
出处
《北京师范大学学报(自然科学版)》
CAS
CSCD
北大核心
2008年第5期498-502,共5页
Journal of Beijing Normal University(Natural Science)
基金
放射性药物教育部重点实验室开放基金资助项目