Journal
JOURNAL OF ANTIMICROBIAL CHEMOTHERAPY
Volume 64, Issue 2, Pages 326-329Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jac/dkp197
Keywords
beta-lactamase; carbapenem resistance; KPC inhibition
Funding
- Novexel SA
Ask authors/readers for more resources
NXL104 is a novel-structure beta-lactamase inhibitor with potent activity against both class A and class C enzymes. Among the class A carbapenemases, KPC-type enzymes are now spreading rapidly and KPC-related carbapenemase resistance is an emerging phenomenon of great clinical importance. The activity of NXL104 against KPC beta-lactamases was examined. Enzymatic activity of purified recombinant KPC-2 was measured with nitrocefin as reporter substrate and inhibition by NXL104 was measured by determination of IC50 values. Antimicrobial susceptibility testing of various beta-lactams combined with a fixed concentration of NXL104 at 4 mg/L against strains producing KPC enzymes was performed by the broth microdilution method. NXL104 was a potent inhibitor of KPC-2 with an IC50 of 38 nM. NXL104 restored the antimicrobial activity of ceftazidime, ceftriaxone, imipenem and piperacillin against Enterobacteriaceae strains producing KPC-2 or KPC-3. MIC values of ceftazidime against KPC producers were reduced by up to 1000-fold by combination with NXL104. NXL104 inhibitory activity is unique in terms of spectrum, encompassing class A extended-spectrum beta-lactamases, class C enzymes and class A carbapenemases. Given the limited therapeutic options available for infections caused by multiresistant Enterobacteriaceae isolates, NXL104 beta-lactamase inhibitor is a promising agent to be used in combination with a beta-lactam to protect its antibacterial activity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available