Efficacy of colistin alone and in various combinations for the treatment of experimental osteomyelitis due to carbapenemase-producing Klebsiella pneumoniae

Crémieux, Anne-Claude; Dinh, Aurélien; Nordmann, Patrice; Mouton, William; Tattevin, Pierre; Ghout, Idir; Jayol, Aurélie; Aimer, Omar; Gatin, Laure; Verdier, Marie-Clémence; Saleh-Mghir, Azzam; Laurent, Frédéric

doi:10.1093/jac/dkz257

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Efficacy of colistin alone and in various combinations for the treatment of experimental osteomyelitis due to carbapenemase-producing Klebsiella pneumoniae

Crémieux, Anne-Claude St Louis Hospital, Paris 7 University, Paris, France - UMR 1173, Versailles Saint-Quentin University, Versailles, France
Dinh, Aurélien UMR 1173, Versailles Saint-Quentin University, Versailles, France - Raymond Poincaré University Hospital, Garches, France
Nordmann, Patrice Medical and Molecular Microbiology Unit, Department of Medicine, Faculty of Science and Medicine, INSERM European Unit (IAME, France), Swiss National Reference Center for Emerging Antibiotic Resistance (NARA), University of Fribourg, Fribourg, Switzerland
Mouton, William Team ‘Staphylococcal pathogenesis’, International Centre for Infectiology Research, INSERM U1111 - CNRS UMR5308 - ENS Lyon - Lyon 1 University, Lyon, France - Institute for Infectious Agents, Department of Bacteriology - CNR des staphylocoques, Croix-Rousse Hospital, North Biology Centre, Hospices Civils de Lyon, Lyon, France
Tattevin, Pierre Pontchaillou University Hospital, Rennes, France - INSERM U1230, Rennes 1 University, IFR140, F-35033, Rennes, France
Ghout, Idir AP-HP, Ambroise Paré University Hospital, Boulogne, France
Jayol, Aurélie Medical and Molecular Microbiology Unit, Department of Medicine, Faculty of Science and Medicine, INSERM European Unit (IAME, France), Swiss National Reference Center for Emerging Antibiotic Resistance (NARA), University of Fribourg, Fribourg, Switzerland
Aimer, Omar Department of Pharmacy, Raymond-Poincaré University Hospital, Garches, France
Gatin, Laure UMR 1173, Versailles Saint-Quentin University, Versailles, France
Verdier, Marie-Clémence Pontchaillou University Hospital, Rennes, France - INSERM U1230, Rennes 1 University, IFR140, F-35033, Rennes, France
Saleh-Mghir, Azzam UMR 1173, Versailles Saint-Quentin University, Versailles, France - Raymond Poincaré University Hospital, Garches, France
Laurent, Frédéric Team ‘Staphylococcal pathogenesis’, International Centre for Infectiology Research, INSERM U1111 - CNRS UMR5308 - ENS Lyon - Lyon 1 University, Lyon, France - Institute for Infectious Agents, Department of Bacteriology - CNR des staphylocoques, Croix-Rousse Hospital, North Biology Centre, Hospices Civils de Lyon, Lyon, France

01.09.2019

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Journal of Antimicrobial Chemotherapy. - 2019, vol. 74, no. 9, p. 2666–2675

English Objectives: In a new experimental model of carbapenemase-producing Klebsiella pneumoniae osteomyelitis we evaluated the efficacy of colistin alone and in various combinations and examined the emergence of colistin-resistant strains and cross- resistance to host defence peptides (HDPs).Methods: KPC-99YC is a clinical strain with intermediate susceptibility to meropenem (MIC = 4 mg/L) and full susceptibility to gentamicin, colistin and tigecycline (MICs = 1 mg/L) and fosfomycin (MIC = 32 mg/L). Time–kill curves were performed at 4× MIC. Osteomyelitis was induced in rabbits by tibial injection of 2 × 108 cfu. Treatment started 14 days later for 7 days in seven groups: (i) control; (ii) colistin; (iii) colistin + gentamicin; (iv) colistin + tigecycline; (v) colistin + meropenem; (vi) colistin + meropenem + gentamicin; and (vii) colistin + fosfomycin.Results: In vitro, colistin was rapidly bactericidal, but regrowth occurred after 9 h. Combinations of colistin with meropenem or fosfomycin were synergistic, whereas combination with tigecycline was antagonistic. In vivo, colistin alone was not effective. Combinations of colistin with meropenem or fosfomycin were bactericidal (P  < 0.001) and the addition of gentamicin enhanced the efficacy of colistin + meropenem (P = 0.025). Tigecycline reduced the efficacy of colistin (P = 0.007). Colistin-resistant strains emerged in all groups except colistin + fosfomycin and two strains showed cross-resistance to HDP LL-37.Conclusions: In this model, combinations of colistin plus meropenem, with or without gentamicin, or colistin plus fosfomycin were the only effective therapies. The combination of colistin and tigecycline should be administered with caution, as it may be antagonistic in vitro and in vivo.

Faculty

Faculté des sciences et de médecine

Department

Médecine 3ème année

Language