Discovery of 1,3-Diaminobenzenes as Selective Inhibitors of Platelet Activation at the PAR1 Receptor
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- 作者：Chris Dockendorff ; Omozuanvbo Aisiku ; Lynn VerPlank ; James R. Dilks ; Daniel A. Smith ; Susanna F. Gunnink ; Louisa Dowal ; Joseph Negri ; Michelle Palmer ; Lawrence MacPherson ; Stuart L. Schreiber ; Robert Flaumenhaft
- 刊名：ACS Medicinal Chemistry Letters
- 出版年：2012
- 出版时间：March 8, 2012
- 年：2012
- 卷：3
- 期：3
- 页码：232-237
- 全文大小：375K
- 年卷期：v.3,no.3(March 8, 2012)
- ISSN：1948-5875
文摘
A high-throughput screen of the NIH-MLSMR compound collection, along with a series of secondary assays to identify potential targets of hit compounds, previously identified a 1,3-diaminobenzene scaffold that targets protease-activated receptor 1 (PAR1). We now report additional structure鈥揳ctivity relationship (SAR) studies that delineate the requirements for activity at PAR1 and identify plasma-stable analogues with nanomolar inhibition of PAR1-mediated platelet activation. Compound 4 was declared as a probe (ML161) with the NIH Molecular Libraries Program. This compound inhibited platelet aggregation induced by a PAR1 peptide agonist or by thrombin but not by several other platelet agonists. Initial studies suggest that ML161 is an allosteric inhibitor of PAR1. These findings may be important for the discovery of antithrombotics with an improved safety profile.