99mTc labeled macrocyclic aza-oxa and aza-thia probes: synthesis, characterization and in vitro & in vivo biological studies
作者:Neelam Yadav、Krishna Chuttani、Anil K. Mishra、Bachcha Singh
DOI:10.1007/s10847-015-0565-0
日期:2015.12
Macrocyclic chelating agents 1-oxa-4,7,10-triazacyclopentadecane-3,11-dione (OTDD) and 1-thia-4,7, 10-triazacyclododecane-3,11-dione (TTDD) have been synthesized and labeled with radionuclide (99mTc), with radiolabeling efficiency 97.6 and 98.4 % respectively. The radiochemical purity of labeled complex (99mTc-OTDD and 99mTc-TTDD) was determined 97.5 and 98.1 %, respectively. The in vitro stability of the labeled chelates in human serum exhibited only <8 % dissociation upto 24 h. The in vivo distribution pattern of the labeled chelators in BALB/c mice suggested that major route of excretion in 99mTc-TTDD is hepatobilliary and minor is renal, while in case of 99mTc-OTDD hepatobilliary as well as renal both comparable. The in vivo blood kinetic studies of radio-complexes of 99mTc-OTDD and 99mTc-TTDD showed 99.26 and 99.4 % blood clearance over 24 h post injection. The biological half-life of 99mTc-OTDD and 99mTc-TTDD with t1/2(F) 1 h 10 min, t1/2(S) 18 h 50 min and t1/2(F) 1 h 42 min, t1/2(S) 18 h 20 min respectively. In vitro cytotoxicity study of OTDD and TTDD did not exhibit any significant antiproliferative property against cancer cells of human glioblastoma U-87, U373 and cervical SW756, HeLa cell lines.
合成了宏环螯合剂1-氧-4,7,10-三氮环十五烷-3,11-二酮(OTDD)和1-硫-4,7,10-三氮环十二烷-3,11-二酮(TTDD),并用放射性核素(99mTc)标记,其放射标记效率分别为97.6%和98.4%。标记复合物(99mTc-OTDD和99mTc-TTDD)的放射化学纯度分别为97.5%和98.1%。在体外实验中,标记螯合剂在人体血清中的稳定性显示,24小时内解离率仅<8%。在BALB/c小鼠体内,标记螯合剂的分布模式表明,99mTc-TTDD的主要排泄途径为肝胆途径,次要为肾脏,而99mTc-OTDD则在肝胆和肾脏排泄途径上相当。99mTc-OTDD和99mTc-TTDD放射复合物的体内血液动力学研究显示,注射后24小时的血液清除率分别为99.26%和99.4%。99mTc-OTDD和99mTc-TTDD的生物半衰期分别为t1/2(F) 1小时10分钟,t1/2(S) 18小时50分钟,以及t1/2(F) 1小时42分钟,t1/2(S) 18小时20分钟。OTDD和TTDD的体外细胞毒性研究未对人脑胶质瘤U-87、U373和宫颈SW756、HeLa细胞系表现出显著的抗增殖特性。