A Prodrug of NMDA/Glycine Site Antagonist, L-703,717, with Improved BBB Permeability. 4-Acetoxy Derivative and Its Positron-Emitter Labeled Analog.
作者:Terushi HARADAHIRA、Ming-Rong ZHANG、Jun MAEDA、Takashi OKAUCHI、Takayo KIDA、Kouichi KAWABE、Sigeki SASAKI、Tetsuya SUHARA、Kazutoshi SUZUKI
DOI:10.1248/cpb.49.147
日期:——
4-Acetoxy derivative (1) of L-703, 717, a high-affinity (IC50=4.5 nM) antagonist for the glycine site of NMDA receptors, was synthesized and its brain uptake was examined using a carbon-11 labeled analog ([11C]1). Initial radioactivity in the brain after intravenous injection of [11C]1 was a 2-fold that of [11C]L-703, 717 in mice. Rapid bioconversion of [11C]1 into [11C]L-703, 717 was demonstrated by metabolite analyses of rat brain after [11C]1 injection. Ex vivo autoradiography of [11C]1 in rat brain showed the same cerebellar localization of radioactivity as [11C]L-703, 717. These results indicate that 1 is a promising pharmacological tool as a prodrug of L-703, 717 with improved BBB permeability.
L-703, 717 是一种高亲和力(IC50=4.5 nM)的 NMDA 受体甘氨酸位点拮抗剂,我们合成了 L-703, 717 的 4-乙酰氧基衍生物(1),并使用碳-11 标记的类似物([11C]1)检测了其脑摄取情况。静脉注射[11C]1 后,小鼠大脑中的初始放射性是[11C]L-703, 717 的 2 倍。注射[11C]1后对大鼠大脑进行的代谢物分析表明,[11C]1可快速生物转化为[11C]L-703, 717。大鼠大脑中[11C]1的体外自显影显示了与[11C]L-703, 717相同的小脑放射性定位。这些结果表明,[11C]1 作为 L-703, 717 的原药,具有改善 BBB 渗透性的前景。