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J Infect Chemother. 2013 Oct;19(5):992-5. doi: 10.1007/s10156-012-0528-y. Epub 2012 Dec 12.

Efficacies of calcium-EDTA in combination with imipenem in a murine model of sepsis caused by Escherichia coli with NDM-1 β-lactamase.

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Department of Microbiology and Infectious Diseases, Faculty of Medicine, Toho University School of Medicine, Tokyo, 143-8540, Japan.


We evaluated the efficacy of ethylenediamine-N,N,N',N'-tetraacetic acid, disodium calcium salt (Ca-EDTA), as an inhibitor for New Delhi metallo-β-lactamase-1 (NDM-1) in vitro antibiotic susceptibility and in a mouse model of sepsis caused by Escherichia coli. Ca-EDTA drastically reduced the MICs of carbapenems for all NDM-producing bacteria [imipenem (IPM) ≤1-2 μg/ml; meropenem (MEPM) ≤1-4 µg/ml]. In the neutropenic murine model of sepsis, the bacterial burden was further reduced by combination therapy using imipenem/cilastatin sodium (IPM/CS) and Ca-EDTA to 2.3 × 10(3) CFU/liver, compared with 2.9 × 10(4) CFU/liver for IPM/CS alone. These data demonstrated the possibility of Ca-EDTA for clinical applications. In our understanding, this is the first report examining the effect of Ca-EDTA on a mouse sepsis model caused by NDM-1-producing bacteria.

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