title: In vivo characterization of the peptide deformylase inhibitor LBM415 in murine infection models.
abstract: LBM415 is an antibacterial agent belonging to the peptide deformylase inhibitor class of compounds. It has previously been shown to demonstrate good activity in vitro against a range of pathogens. In this study, the in vivo efficacy of LBM415 was evaluated in various mouse infection models. We investigated activity against a systemic infection model caused by intraperitoneal inoculation of Staphylococcus aureus (methicillin [meticillin] susceptible [MSSA] and methicillin resistant [MRSA]) and Streptococcus pneumoniae (penicillin susceptible [PSSP] and multidrug resistant [MDRSP]), a thigh infection model caused by intramuscular injection of MRSA, and a lung infection produced by intranasal inoculation of PSSP. In the systemic MSSA and MRSA infections, LBM415 was equivalent to linezolid and vancomycin. In the systemic PSSP infection, LBM415 was equivalent to linezolid, whereas against systemic MDRSP infection, the LBM415 50% effective dose (ED50) was 4.8 mg/kg (dosed subcutaneously) and 36.6 mg/kg (dosed orally), compared to 13.2 mg/kg for telithromycin and >60 mg/kg for penicillin V and clarithromycin. In the MRSA thigh infection, LBM415 significantly reduced thigh bacterial levels compared to those of untreated mice, with levels similar to those after treatment with linezolid at the same dose levels. In the pneumonia model, the ED50 to reduce the bacterial lung burden by >4 log10 in 50% of treated animals was 23.3 mg/kg for LBM415, whereas moxifloxacin showed an ED50 of 14.3 mg/kg. In summary, LBM415 showed in vivo efficacy in sepsis and specific organ infection models irrespective of resistance to other antibiotics. Results suggest the potential of peptide deformylase inhibitors as a novel class of therapeutic agents against antibiotic-resistant pathogens.
authors: Infectious Diseases, Novartis Institutes for BioMedical Research, Inc., Cambridge, MA 02139, USA. colin.osborne@novartis.com
authors: Colin S
authors: CS
authors: Osborne
authors: Georg
authors: G
authors: Neckermann
authors: Evelin
authors: E
authors: Fischer
authors: Robert
authors: R
authors: Pecanka
authors: Donghui
authors: D
authors: Yu
authors: Kari
authors: K
authors: Manni
authors: Julie
authors: J
authors: Goldovitz
authors: Kerri
authors: K
authors: Amaral
authors: JoAnn
authors: J
authors: Dzink-Fox
authors: Neil S
authors: NS
authors: Ryder
mesh_terms: D000081:Acetamides / Q000493:pharmacokinetics / Q000494:pharmacology / Q000627:therapeutic use; D000581:Amidohydrolases / Q000037:antagonists & inhibitors*; D000818:Animals; D000890:Anti-Infective Agents / Q000493:pharmacokinetics / Q000494:pharmacology* / Q000627:therapeutic use*; D005260:Female; D000069349:Linezolid; D051379:Mice; D008807:Mice, Inbred BALB C; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D023303:Oxazolidinones / Q000493:pharmacokinetics / Q000494:pharmacology / Q000627:therapeutic use; D010455:Peptides / Q000493:pharmacokinetics / Q000494:pharmacology* / Q000627:therapeutic use*; D011014:Pneumonia / Q000188:drug therapy* / Q000382:microbiology; D013211:Staphylococcus aureus / Q000187:drug effects*; D013296:Streptococcus pneumoniae / Q000187:drug effects; D013848:Thigh / Q000473:pathology
chemical_list: D000081:Acetamides; D000890:Anti-Infective Agents; C487638:NVP PDF 713; D023303:Oxazolidinones; D010455:Peptides; D000581:Amidohydrolases; C084507:peptide deformylase; D000069349:Linezolid