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作 者:杨洋[1] 刘莹[1] 韩美娇[1] 张家新[1] 韩梅[1] 王科志[1] 朱霖[1]
机构地区:[1]放射性药物教育部重点实验室北京师范大学化学学院,北京100875
出 处:《核化学与放射化学》2009年第4期212-216,共5页Journal of Nuclear and Radiochemistry
基 金:国家"973"项目(2006CB500705);国家自然科学基金资助项目(20371008;90401007);新医药学科群建设资助项目(XK100270569)
摘 要:为发展锝-99 m标记的阿尔茨海默病(Alzhei mer’s disease,AD)早期诊断显像药物,在荧光测定法基础上,建立了体外荧光法测定羰基铼配合物与Aβ(1~40)淀粉样纤维结合的解离常数Kd的方法。同时,合成了配体2-(1-乙基苯并咪唑)吡啶(EPBI)及其铼的配合物Re(CO)3Cl(EPBI),测定后者与体外缠结Aβ(1~40)结合的解离常数Kd;采用直接标记法制备EPBI的[99Tcm(CO)3]+配合物,并研究配合物[99Tcm(CO)3]+-EPBI的理化性质及生物分布。结果表明,Re(CO)3Cl(EPBI)与Aβ(1~40)结合的解离常数Kd=13.3μmol/L;正常小鼠体内生物分布研究表明,化合物[99Tcm(CO)3]+-EPBI的脑初始(2 min内)摄取值为(0.63±0.17)%ID/g(n=3),在脑内清除较快,120 min时,摄取值为(0.27±0.03)%ID/g(n=3)。The aim of this paper was to develop potential technetium 99m-labeled diagnostic imaging agents specific for the detection of Aβ plaques. Based on previously obtained All plaque-specific biphenyls containing a benzimidazol group, ^99Tc^m and Re-benzimidazol derivatives, [^99Tc^m(CO)3]^+-EPBI and Re(CO)3Cl(EPBI), were prepared. The latter showed binding affinities towards Aβ(1-40) aggregates in vitro (Kd = 13.3 μmol/L) by fluorophotometry. 2- (1-Ethylbenzimidazol-2-yl) pyridine (EPBI) and Re (CO) 3 Cl (EPBI) were synthesized. Binding affinity of Re(CO)3CI(EPBI) for Aβ(1-40) aggregates was determined. [^99Tc^m(CO)3]^+-EPBI was prepared and analyzed by HPLC and paper eletrophoresis. Its biodistribution in mice was obtained. The Kd value of Re (CO)3Cl (EPBI) is 13. 3 μmol/L. Biodistribution of [^99Tc^m(CO)3]^+ -EPBI in mice shows brain penetration (0. 63±0. 17)%ID/g (n=3) at 2 rain after iv injection in mice and rapid washout from normal brains (0. 27±0.03) %ID/g (n=3) at 120 min. It may provide a new strategy to design the early diagnosis radiopharmaceuticals of AD labeled by [^99Tc^m(CO)3]^+ core according to the result.
关 键 词:阿尔茨海默病 荧光 Re/[99Tcm(CO)3]+-EPBI KD Aβ(1~40) 生物分布
分 类 号:R817[医药卫生—影像医学与核医学]
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