NPS 1506 [3-fluoro-γ-(3-fluorophenyl)-N-methylbenzenepropamine] is representative of a non-psychotomimetic class of N-methyl-D-aspartate (NMDA) receptor antagonists. [11C]NPS 1506 was prepared at high radiochemical purity (>98%) with a specific activity of around 50 GBq/μmol at the end of synthesis by methylation of the desmethyl precursor with [11C]methyl iodide in the presence of NaH. Biodistribution of [11C]NPS 1506 in mice and rat demonstrated that uptake into the brain was rapid and occurred at high levels. [11C]NPS 1506 showed no appreciable specific binding in rodent brains under in vivo conditions, possibly because of both a large non-specific bound fraction and low in vitro binding affinity for NMDA receptors.
                                    NPS 1506 [3-
氟-γ-(3-
氟苯基)-N-甲基苯
丙胺]是一类非拟精神药物 N-甲基-<小>D小>-
天冬氨酸(N
MDA)受体拮抗剂的代表。[11C]NPS 1506 是在 NaH 存在下,用[11C]甲基
碘对去甲基前体进行甲基化而制备的,放射
化学纯度高(>98%),合成结束时的比活度约为 50 GBq/μmol。[11C]NPS1506在小鼠和大鼠体内的
生物分布表明,大脑摄取速度快,摄取量高。在体内条件下,[11C]NPS 1506 在啮齿类动物大脑中没有显示出明显的特异性结合,这可能是由于非特异性结合部分较大以及体外与 N
MDA 受体的结合亲和力较低。