Substrate Fragmentation for the Design of<i>M. tuberculosis</i>CYP121 Inhibitors
作者:Madeline E. Kavanagh、Janine L. Gray、Sophie H. Gilbert、Anthony G. Coyne、Kirsty J. McLean、Holly J. Davis、Andrew W. Munro、Chris Abell
DOI:10.1002/cmdc.201600248
日期:2016.9.6
the structures of CYP121 substrates. The resulting inhibitors have low micromolar affinity, good predicted physicochemical properties and selectivity for CYP121 over other Mtb P450s. Spectroscopic characterisation of the inhibitors' binding mode provides insight into the effect of weak nitrogen-donor ligands on the P450 heme, an improved understanding of factors governing CYP121-ligand recognition and
A series of imidazole derivatives has been prepared using high throughput parallel synthesis. Several compounds showed high affinity (K-i in 10(-6)-10(-8) M range) and selectivity at recombinant human somatostatin receptor subtype 3 (hsst(3)). (C) 2001 Elsevier Science Ltd. All rights reserved.
SAR exploration at the C-3 position of tetrahydro-β-carboline sstr3 antagonists
作者:Shuwen He、Peter H. Dobbelaar、Liangqin Guo、Zhixiong Ye、Jian Liu、Tianying Jian、Quang Truong、Shrenik K. Shah、Wu Du、Hongbo Qi、Raman K. Bakshi、Qingmei Hong、James D. Dellureficio、Edward Sherer、Alexander Pasternak、Zhe Feng、Mikhail Reibarkh、Melissa Lin、Koppara Samuel、Vijay B. Reddy、Stan Mitelman、Sharon X. Tong、Gary G. Chicchi、Kwei-Lan Tsao、Dorina Trusca、Margaret Wu、Qing Shao、Maria E. Trujillo、Guillermo Fernandez、Donald Nelson、Patricia Bunting、Janet Kerr、Patrick Fitzgerald、Pierre Morissette、Sylvia Volksdorf、George J. Eiermann、Cai Li、Bei B. Zhang、Andrew D. Howard、Yun-Ping Zhou、Ravi P. Nargund、William K. Hagmann
DOI:10.1016/j.bmcl.2016.02.022
日期:2016.3
MK-4256, a tetrahydro-beta-carboline sstr3 antagonist, was discontinued due to a cardiovascular (CV) adverse effect observed in dogs. Additional investigations revealed that the CV liability (QTc prolongation) was caused by the hERG off-target activity of MK-4256 and was not due to sstr3 antagonism. In this Letter, we describe our extensive SAR effort at the C3 position of the tetrahydro-beta-carboline structure. This effort resulted in identification of 5-fluoro-pyridin-2-yl as the optimal substituent on the imidazole ring to balance sstr3 activity and the hERG off-target liability. (C) 2016 Elsevier Ltd. All rights reserved.
Stimulation of Glucose-Dependent Insulin Secretion by a Potent, Selective sst<sub>3</sub> Antagonist
作者:Alexander Pasternak、Zhe Feng、Reynalda de Jesus、Zhixiong Ye、Shuwen He、Peter Dobbelaar、Scott A. Bradley、Gary G. Chicchi、Kwei-Lan Tsao、Dorina Trusca、George J. Eiermann、Cai Li、Yue Feng、Margaret Wu、Qing Shao、Bei B. Zhang、Ravi Nargund、Sander G. Mills、Andrew D. Howard、Lihu Yang、Yun-Ping Zhou
DOI:10.1021/ml200272z
日期:2012.4.12
This letter provides the first pharmacological proof of principle that the sst(3) receptor mediates glucose-stimulated insulin secretion (GSIS) from pancreatic beta-cells. To enable these studies, we identified the selective sst3 antagonist (1R,3R)-3-(5-phenyl-1H-imidazol-2-yl)-1-(tetrahydro-2H-pyran-4-yl)-2,,3,4,9-tetrahydro-1H-beta-carboline (5a), with improved ion channel selectivity and mouse pharmacokinetic properties as compared to previously described tetrahydro-beta-carboline imidazole sst3 antagonists. We demonstrated that compound 5a enhances GSIS in pancreatic beta-cells and blocks glucose excursion induced by dextrose challenge in ipGTT and OGTT models in mice. Finally, we provided strong evidence that these effects are mechanism-based in an ipGTT study, showing reduction of glucose excursion in wild-type but not sst(3) knockout mice. Thus, we have shown that antagonism of sst(3) represents a new mechanism with potential in treating type 2 diabetes mellitus.