Imidazopyridine- and Purine-Thioacetamide Derivatives: Potent Inhibitors of Nucleotide Pyrophosphatase/Phosphodiesterase 1 (NPP1)
作者:Lei Chang、Sang-Yong Lee、Piotr Leonczak、Jef Rozenski、Steven De Jonghe、Theodor Hanck、Christa E. Müller、Piet Herdewijn
DOI:10.1021/jm501434y
日期:2014.12.11
Nucleotide pyrophosphatase/phosphodiesterase 1 (NPP1) belongs to the family of ecto-nucleotidases, which control extracellular nucleotide, nucleoside, and (di)phosphate levels. To study the (patho)physiological roles of NPP1 potent and selective inhibitors with drug-like properties are required. Therefore, a compound library was screened for NPP1 inhibitors using a colorimetric assay with p-nitrophenyl
核苷酸焦磷酸酶/磷酸二酯酶1(NPP1)属于胞外核苷酸酶家族,可控制细胞外核苷酸,核苷和(di)磷酸盐的水平。为了研究具有药物样特性的NPP1强效和选择性抑制剂的(病理)生理作用。因此,使用比色测定法以对硝基苯基5'-胸苷单磷酸酯(p -Nph-5'-TMP)作为人工底物,筛选化合物库中的NPP1抑制剂。这导致发现2-(3 H-咪唑并[4,5 - b ]吡啶-2-基硫基)-N-(3,4-二甲氧基苯基)乙酰胺(5a)为具有K i的命中化合物。值为217 nM。随后的结构-活性关系研究导致了嘌呤和咪唑并[4,5- b ]吡啶类似物的开发,用p -Nph-5'-进行测定具有高抑制力(K i值分别为5.00 nM和29.6 nM)。以TMP为底物。出乎意料的是,与ATP作为底物相比,测试时这些化合物的效力明显较低,K i值在低微摩尔范围内。对原型抑制剂的抑制机理进行了研究,发现该抑制剂与两种底物都具有竞争性。
Aminoazabenzimidazoles, a Novel Class of Orally Active Antimalarial Agents
作者:Shahul Hameed P、Murugan Chinnapattu、Gajanan Shanbag、Praveena Manjrekar、Krishna Koushik、Anandkumar Raichurkar、Vikas Patil、Sandesh Jatheendranath、Suresh S. Rudrapatna、Shubhada P. Barde、Nikhil Rautela、Disha Awasthy、Sapna Morayya、Chandan Narayan、Stefan Kavanagh、Ramanatha Saralaya、Sowmya Bharath、Pavithra Viswanath、Kakoli Mukherjee、Balachandra Bandodkar、Abhishek Srivastava、Vijender Panduga、Jitender Reddy、K. R. Prabhakar、Achyut Sinha、María Belén Jiménez-Díaz、María Santos Martínez、Iñigo Angulo-Barturen、Santiago Ferrer、Laura María Sanz、Francisco Javier Gamo、Sandra Duffy、Vicky M. Avery、Pamela A. Magistrado、Amanda K. Lukens、Dyann F. Wirth、David Waterson、V. Balasubramanian、Pravin S. Iyer、Shridhar Narayanan、Vinayak Hosagrahara、Vasan K. Sambandamurthy、Sreekanth Ramachandran
DOI:10.1021/jm500535j
日期:2014.7.10
Whole-cell high-throughput screening of the AstraZeneca compound library against the asexual blood stage of Plasmodium falciparum (Pf) led to the identification of amino imidazoles, a robust starting point for initiating a hit-to-lead medicinal chemistry effort. Structure-activity relationship studies followed by pharmacokinetics optimization resulted in the identification of 23 as an attractive lead with good oral bioavailability. Compound 23 was found to be efficacious (ED90 of 28.6 mg.kg(-1)) in the humanized P. falciparum mouse model of malaria (Pf/SCID model). Representative compounds displayed a moderate to fast killing profile that is comparable to that of chloroquine. This series demonstrates no cross-resistance against a panel of Pf strains with mutations to known antimalarial drugs, thereby suggesting a novel mechanism of action for this chemical class.