Synthesis and functional evaluation of chiral dendrimer–triamine-coordinated Gd complexes as highly sensitive MRI contrast agents
作者:Yuka Miyake、Yu Kimura、Syungo Ishikawa、Hiroshi Tsujita、Hiroki Miura、Michiko Narazaki、Tetsuya Matsuda、Yasuhiko Tabata、Tetsuya Yano、Akio Toshimitsu、Teruyuki Kondo
DOI:10.1016/j.tetlet.2012.06.072
日期:2012.8
Novel chiral dendrimer–triamine-coordinated Gd complexes were synthesized and shown to have longitudinal relaxivity (r1) 3 times higher than that of clinically used Gd-DTPA. The pharmacokinetic differences between optical isomers were estimated from the affinity of 2-(R) and 2-(S) with bovine serum albumin (BSA), respectively, by a quartz crystal microbalance (QCM) measurement. As a result, the association
合成了新型手性树状聚合物-三胺配位的Gd复合物,其纵向弛豫度(r 1)比临床使用的Gd-DTPA高3倍。通过2-(R)和2-(S)分别与牛血清白蛋白(BSA)的亲和力,通过石英晶体微量天平(QCM)测量来估计旋光异构体之间的药代动力学差异。结果,2-(S)的缔合常数K a大约是2-(R)的缔合常数K a的4倍,这意味着2-(S)给药后,其在血管retention留中的保留时间更长。静脉注射2-(R)和2-(S)前后小鼠的T1加权MR图像以及血管中信号强度(SI)的时程也支持了这一结果并量化血液和尿液中Gd 3+的浓度。