Synthesis and ABCG2 Inhibitory Activity of Novel Fumitremorgin C Analogs – Specificity and Structure Activity Correlations
作者:Orsolya Szolomajer-Csikos、Erzsebet Beery、Levente Kosa、Zsuzsanna Rajnai、Marton Jani、Anasztazia Hetenyi、Katalin Tauber Jakab、Peter Krajcsi、Gabor K Toth
DOI:10.2174/1573406411309040003
日期:2013.4.1
The Ko family of fumitremorgin C analogs are potent and selective ABCG2 inhibitors. However, the most potent
Ko compounds carry an ester linkage in their side-chain that makes them chemically and metabolically less stable.
We have synthesized 16 tricyclic and 28 tetracyclic novel analogs devoid of ester linkages and tested them for ABCG2
inhibition potency and specificity. Unlike in the tricyclic analog group, potent ABCG2 inhibitory compounds were found
among the tetracyclic analogs. The most potent compounds carried the 3S,6S,12aS configuration. We observed a marked
stereospecificity as compounds with the 3S,6S,12aS configuration were at least 18-fold more potent inhibitors than their
diastereoisomeric pairs with a 3S,6R,12aS configuration. This stereospecificity was not observed in ABCB1 and ABCC1
inhibition. Therefore, a single chiral center confers specificity for ABCG2 over ABCB1 and ABCC1. This is quite unexpected
considering the large multivalent drug binding site these transporters harbor.
Ko家族的麹霉素C类似物是强效且具有选择性的ABCG2抑制剂。然而,最强的Ko化合物在其侧链中具有酯键,这使得它们在化学和代谢上不太稳定。我们合成了16种三环化合物和28种四环新类似物,这些类似物不含酯键,并对其ABCG2抑制效力和特异性进行了测试。与三环类似物组不同,在四环类似物中发现了强效ABCG2抑制化合物。最强效的化合物具有3S,6S,12aS构型。我们观察到明显的立体特异性,具有3S,6S,12aS构型的化合物至少比具有3S,6R,12aS构型的差向异构体强18倍。这种立体特异性在ABCB1和ABCC1抑制作用中未见。因此,单一的手性中心赋予了ABCG2相对于ABCB1和ABCC1的特异性。考虑到这些转运蛋白具有的大型多价药物结合位点,这是相当意外的。