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HERO ID
3044680
Reference Type
Journal Article
Title
Discovery, synthesis and structure-activity analysis of symmetrical 2,7-disubstituted fluorenones as urea transporter inhibitors
Author(s)
Lee, S; Esteva-Font, C; Phuan, PW; Anderson, MO; Verkman, AS
Year
2015
Volume
6
Page Numbers
1278-1284
Language
English
PMID
26191399
DOI
10.1039/C5MD00198F
Abstract
Kidney urea transporters are targets for development of small-molecule inhibitors with action as salt-sparing diuretics. A cell-based, functional high-throughput screen identified 2,7-bisacetamido fluorenone 3 as a novel inhibitor of urea transporters UT-A1 and UT-B. Here, we synthesized twenty-two 2,7-disubstituted fluorenone analogs by acylation. Structure-activity relationship analysis revealed: (a) the carbonyl moiety at C9 is required for UT inhibition; (b) steric limitation on C2, 7-substituents; and (c) the importance of a crescent-shape structure. The most potent fluorenones inhibited UT-A1 and UT-B urea transport with IC50 ~ 1 μM. Analysis of in vitro metabolic stability in hepatic microsomes indicated metabolism of 2,7-disubstituted fluorenones by reductase and subsequent elimination. Computational docking to a homology model of UT-A1 suggested UT inhibitor binding to the UT cytoplasmic domain at a site that does not overlap with the putative urea binding site.
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Trimethylbenzenes (Interagency Science Discussion Draft)
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Chemistry or Physical or Engineering
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Trimethylbenzenes (TMB)
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