Vesamicol Receptor Mapping of Brain Cholinergic Neurons with Radioiodine- Labeled Positional Isomers of Benzovesamicol
作者:Yong-Woon Jung、Kirk A. Frey、G. Keith Mulholland、Renato del Rosario、Phillip S. Sherman、David M. Raffel、Marcian E. Van Dort、David E. Kuhl、David L. Gildersleeve、Donald M. Wieland
DOI:10.1021/jm9507486
日期:1996.1.1
facial nuclei. Except for cortex, regional brain levels of (-)-5-[123I]IBVM ((-)-[123I]5) at 4 h exhibited a linear correlation (r2 = 0.99) with endogenous levels of choline acetyltransferase. CONCLUSION: Vesamicol receptor mapping of cholinergic nerve terminals in murine brain can be achieved with 5-IBVM (5) and less robustly with 6-IBVM (10), whereas the brain localization of 7-IBVM (14) reflects high-affinity
阿尔茨海默氏病的特征在于进行性脑胆碱能神经元变性。与位于乙酰胆碱储存小泡的摄取转运蛋白上的维他命胺高亲和力结合的苯并维他命的放射性示踪剂类似物可提供胆碱能神经元完整性的体内标志物。合成了五个外消旋碘苯并呋喃唑醇的位置异构体(4'-,5-,6-,7-和8-IBVM),用碘125交换标记,并评估了中枢胆碱能神经元的体内标记物。只有两种异构体,即5-IBVM(5)和6-IBVM(10),在小鼠脑中的分布模式与胆碱能神经支配相一致:纹状体>>海马>或=皮质>下丘脑>>小脑。5-IBVM(5)的24小时组织与小脑浓度之比,纹状体高3至4倍,皮层和海马的比例要比6-IBVM高(10)。8-IBVM(16)和4'-IBVM(17)在所检查的任何大脑区域均未表现出选择性保留。在心脏中,只有5-IBVM(5)的心房/心室浓度比与高外周胆碱能神经元选择性一致。7-IBVM(14)异构体表现出异常的大脑分布模式