Structure–Activity Relationship for the Picolinamide Antibacterials that Selectively Target <i>Clostridioides difficile</i>
作者:Enrico Speri、Yuanyuan Qian、Jeshina Janardhanan、Cesar Masitas、Elena Lastochkin、Stefania De Benedetti、Man Wang、Valerie A. Schroeder、William R. Wolter、Allen G. Oliver、Jed F. Fisher、Shahriar Mobashery、Mayland Chang
DOI:10.1021/acsmedchemlett.1c00135
日期:2021.6.10
Clostridioidesdifficile is a leading health threat. This pathogen initiates intestinal infections during gut microbiota dysbiosis caused by oral administration of antibiotics. C. difficile is difficult to eradicate due to its ability to form spores, which are not susceptible to antibiotics. To address the urgent need for treating recurrent C. difficileinfection, antibiotics that selectively target
Discovery of Dap-3 Polymyxin Analogues for the Treatment of Multidrug-Resistant Gram-Negative Nosocomial Infections
作者:Thomas V. Magee、Matthew F. Brown、Jeremy T. Starr、David C. Ackley、Joseph A. Abramite、Jiri Aubrecht、Andrew Butler、Jared L. Crandon、Fadia Dib-Hajj、Mark E. Flanagan、Karl Granskog、Joel R. Hardink、Michael D. Huband、Rebecca Irvine、Michael Kuhn、Karen L. Leach、Bryan Li、Jian Lin、David R. Luke、Shawn H. MacVane、Alita A. Miller、Sandra McCurdy、James M. McKim、David P. Nicolau、Thuy-Trinh Nguyen、Mark C. Noe、John P. O’Donnell、Scott B. Seibel、Yue Shen、Antonia F. Stepan、Andrew P. Tomaras、Paul C. Wilga、Li Zhang、Jinfeng Xu、Jinshan Michael Chen
DOI:10.1021/jm400416u
日期:2013.6.27
We report novel polymyxin analogues with improved antibacterial in vitro potency against polymprin resistant recent clinical isolates of Acinetobacter baumannii and Pseudomonas aeruginosa. In addition, a human renal cell in vitro assay (hRPTEC) was used to inform structure-toxicity relationships and further differentiate analogues. Replacement of the Dab-3 residue with a Dap-3 in combination with a relatively polar 6-oxo-1-phenyl-1,6-dihydropyridine-3-carbonyl side chain as a fatty acyl replacement yielded analogue 5x, which demonstrated an improved in vitro antimicrobial and renal cytotoxicity profiles relative to polymyxin B (PMB). However, in vivo PK/PD comparison of 5x and PMB in a murine neutropenic thigh model against P. aeruginosa strains with matched MICs showed that 5x was inferior to PMB in vivo, suggesting a lack of improved therapeutic index in spite of apparent in vitro advantages.