Structure-affinity profile of 8-hydroxycarbostyril-based agonists that dissociate slowly from the β2-adrenoceptor
作者:M. D. Deyrup、S. T. Nowicki、N. G. J. Richards、D. H. Otero、J. K. Harrison、S. P. Baker
DOI:10.1007/pl00005339
日期:1999.3.5
its k(off). Only those derivatives with the lowest k(off)-values induced a decrease in the receptor density of DDT cell membranes following a preincubation and extensive washing. The data show that the 8-hydroxycarbostyril nucleus in conjunction with substitutions on the tertiary alpha carbon of the side chain and positioning of the phenyl group are important characteristics determining the high affinity
已显示几种基于羧甲基的β-激动剂与β2-肾上腺素能受体(β2AR)紧密结合并缓慢解离。在本研究中,有助于其结合特性的8-羟基-5- [2-[((1-苯基-2-甲基丙-2-基)氨基] -1-羟基乙基]-卡斯蒂替利(11a)的结构特征使用一系列合成的类似物研究了beta2AR上的α-氨基丁酸。确定了k(off),该值由受体密度降低,Ki和配体诱导的受体降低的DDT1 MF-2(DDT)细胞中cAMP降低的速率估算。所有衍生物均在亚纳摩尔至中纳摩尔范围内刺激cDT在DDT细胞中的积累,并引起与(-)异丙肾上腺素相同的最大刺激。具有包含2-甲基丁基的侧链N-取代的11a的衍生物,与11a相比,苯乙基和异丙基具有更高的k(off)值和更低的亲和力。将侧链叔α碳和苯基之间的亚甲基数量从11a中的1增加到3或将其数量减少到0也导致k(off)和Ki值更高的衍生物。此外,用邻苯二酚代替11a的8-羟基碳炔