Dopamine/Serotonin Receptor Ligands. 10: SAR Studies on Azecine-type Dopamine Receptor Ligands by Functional Screening at Human Cloned D<sub>1</sub>, D<sub>2L</sub>, and D<sub>5</sub> Receptors with a Microplate Reader Based Calcium Assay Lead to a Novel Potent D<sub>1</sub>/D<sub>5</sub> Selective Antagonist
作者:Barbara Hoefgen、Michael Decker、Patrick Mohr、Astrid M. Schramm、Sherif A. F. Rostom、Hussein El-Subbagh、Peter M. Schweikert、Dirk R. Rudolf、Matthias U. Kassack、Jochen Lehmann
DOI:10.1021/jm050846j
日期:2006.1.1
On the basis of the benz[d]indolo[2,3-g]azecine derivative I (LE300), structure-activity relations were investigated in order to identify the pharmacophore in this new class of ligands. Various structural modifications were performed and the inhibitory activities at human cloned D-1, D-2L, and D-5 receptors were measured by using a simple fluorescence microplate reader based calcium assay. Subsequently, the affinities of active compounds were estimated by radioligand binding experiments. Deleting one of the aromatic rings as well as replacing it by a phenyl moiety abolishes the inhibitory activities almost completely. Contraction of the 10-membered central ring decreases them significantly. The replacement of indole by thiophene or N-methylpyrrole reduces the inhibitory activity, whereas replacing the indole by benzene increases it. Finally, the hydroxylated dibenz[d,g]azecine derivative 11d (LE404) was found to be more active than the lead I in the functional calcium assay as well as in radioligand displacement experiments.
作者:Mohamed A. O. Abdel-Fattah、Ashraf H. Abadi、Jochen Lehmann、Peter M. Schweikert、Christoph Enzensperger
DOI:10.1039/c5md00258c
日期:——
subtype selectivity is a challenge because of the high identity within the receptor helices. Based on the lead compounds 1–3, the thieno-benzazecine regioisomers 4 and 5 were synthesized and biologically evaluated for their affinity towards the five dopamine receptor subtypes utilizing a radioligand binding affinity technique. Within the D1-like family, compound 4 showed 20 fold selectivity for the
由于受体螺旋内的高度同一性,设计具有D 1 / D 5亚型选择性的配体是一项挑战。基于先导化合物1-3,合成了噻吩-苯并ze庚因区域异构体4和5,并使用放射性配体结合亲和力技术对它们对五种多巴胺受体亚型的亲和力进行了生物学评估。内的d 1样家族,化合物4显示出对d 20倍的选择性5亚型超过d 1亚型(ķ我= 3nm时,d 1:60纳米),而它的区域异构体,化合物5用颠倒噻吩位置,更喜欢d 1在d亚型5亚型(ķ我= 4nM的,d 5:15纳米)。苯并噻吩并-苯并ze庚因类似物6被证明是对D 1-和D 2-样家族成员具有相同亲和力的几个数量级(A D 2和1.9的K i = 1.5 nM)具有高亲和力的a嗪衍生物之一。D 5为nM )。彻底分析构成目标多巴胺受体亚型结合口袋的氨基酸残基,发现在D 5 通过阴离子氨基酸稳定的丝氨酸S 6.62和苏氨酸T 7.33残基或水网络的受体可能有助于合成化合物的选择性模式。