Technetium-99m Labeled Pyridyl Benzofuran Derivatives as Single Photon Emission Computed Tomography Imaging Probes for β-Amyloid Plaques in Alzheimer’s Brains
作者:Yan Cheng、Masahiro Ono、Hiroyuki Kimura、Masashi Ueda、Hideo Saji
DOI:10.1021/jm201513c
日期:2012.3.8
Three novel 99mTc-labeled pyridyl benzofuran derivatives were tested as potential probes for imaging β-amyloid plaques using single photon emission computed tomography (SPECT). The 99mTc and corresponding rhenium complexes were synthesized with bis(aminoethanethiol) (BAT) as a chelating ligand. All Re complexes showed affinity for Aβ(1–42) aggregates (Ki = 13.6–149.6 nM). Biodistribution experiments
测试了三种新颖的99m Tc标记的吡啶基苯并呋喃衍生物,作为使用单光子发射计算机断层扫描(SPECT)对β-淀粉样蛋白斑进行成像的潜在探针。的99米Tc和对应铼复合物用双(氨基乙硫醇)(BAT)作为螯合配体合成。所有Re复合物均显示出对Aβ(1-42)聚集体的亲和力(K i = 13.6-149.6 nM)。在正常小鼠中进行的生物分布实验表明,99m Tc标记的衍生物在大脑中显示出足够的摄取(注射后2分钟为1.41–1.80%ID / g)。值得注意的是,[ 99mTc] BAT-Bp-2表现出良好的初始摄取(2分钟时为1.80%ID / g)和合理的脑液冲洗(60分钟时为0.79%ID / g)。用[ 99m Tc] BAT-Bp-2进行的放射自显影显示,在Tg2576转基因小鼠的脑组织切片中,β-淀粉样斑块有大量标记,而在年龄匹配的对照中则没有。[ 99m Tc] BAT-Bp-2可能