Cited by 22Antibiotic Resistance in BacteriaAntibiotic Use and ResistanceAntimicrobial Resistance in Staphylococcus

Impact of Carbapenem Heteroresistance Among Multidrug-Resistant ESBL/AmpC-Producing Klebsiella pneumoniae Clinical Isolates on Antibiotic Treatment in Experimentally Infected Mice

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Xiong, Yilin, Han, Yuqiao, Zhao, Zinan, Gao, Wenting, Ma, Yong, Jiang, Shiyu, Wang, Mengyao, Zhang, Qingqing +2 more·2021·Infection and Drug Resistance

Abstract

Purpose: Antibiotic resistance is a growing health crisis that is further complicated by treatment failures caused by bacteria that exhibit heterogeneous susceptibility to antibiotics. The aim of this study was to describe imipenem (IPM)-heteroresistant strains among multidrug-resistant (MDR) ESBL/AmpC-producing Klebsiella pneumoniae clinical isolates, investigate their molecular phenotypic characteristics, and elucidate the outcome of antibiotic treatment in mice infected with the heteroresistant isolates. Materials and Methods: Antimicrobial susceptibility of K. pneumoniae isolates was determined by the disk diffusion and E-test methods. Heteroresistance to IPM was confirmed by population analysis profile (PAP) assays. PCR and sequencing were employed to detect MDR determinants. Molecular differences between the susceptible and resistant subpopulations were evaluated by sequencing and quantitative real-time reverse transcription PCR (qRT-PCR) analysis. The effect of the carbapenem-heteroresistant strains on antibiotic treatment was assessed using a mouse model of peritonitis with heteroresistant K. pneumoniae and subsequent treatment with IPM. Results: In total, 37 MDR ESBL/AmpC-producing clinical isolates of K. pneumoniae were identified between September 2018 and December 2019. These strains were notably resistant to conventional antimicrobials other than carbapenems. Among the isolates, three strains exhibited heteroresistance to IPM and carried several ESBL and/or AmpC genes. Mice infected with a lethal dose of any of the three heteroresistant isolates were unable to survive in the presence of IPM treatment, as the percentage of the IPM-resistant subpopulation of each strain was increased in the peritoneum of these mice at 24 h after infection. The resistant subpopulation of the strains presented pulsed-field gel electrophoresis (PFGE) profiles that were identical to those of the susceptible subpopulation, but ompK36 porin showed a reduction in gene expression (0.09- to 0.50-fold) in the resistant subpopulation. Conclusion: Carbapenem-heteroresistant strains were present among the MDR K. pneumoniae isolates producing ESBL/AmpC β-lactamases, and these heteroresistant strains failed IPM therapy in experimentally infected mice. Keywords: Enterobacteriaceae , imipenem, heterogeneous susceptibility, treatment failure, OmpK porin, in vivo

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  1. [1]O’Neill J. Tackling drug-resistant infections globally: final report and recommendations. The Review on Antimicrobial Resistance London, United Kingdom; 2016.

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Authors
Xiong, Y., Han, Y., Zhao, Z., Gao, W., Ma, Y., Jiang, S., Wang, M., Zhang, Q., Zhou, Y., & Chen, Y.
Affiliations
Dalian Medical University (CN)
Corresponding author
Chen, Yang
Venue
Infection and Drug Resistance
Published
2021-12
Volume
Volume 14
Pages
5639-5650
ISSN
1178-6973 (ISSN-L)
OpenAlex
W4200386557
Cited by
22
References
44
Citations by year
2026: 4 · 2025: 7 · 2024: 4 · 2023: 3 · 2022: 4
FWCI
0.87
Type
journal article
Language
en
Open access
Locations
  • Infection and Drug Resistance (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Dove Medical Press (Taylor and Francis Group) (submittedVersion, cc-by-nc)
Funders
  • National Natural Science Foundation of China (81401697)
  • Natural Science Foundation of Liaoning Province (2019-MS-092)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Medicine › Antibiotic Resistance in Bacteria
  • Life Sciences › Immunology and Microbiology › Applied Microbiology and Biotechnology › Antibiotic Use and Resistance
  • Health Sciences › Medicine › Infectious Diseases › Antimicrobial Resistance in Staphylococcus
Keywords
Klebsiella pneumoniae, multidrug resistance, extended-spectrum beta-lactamase, AmpC beta-lactamase, imipenem, population analysis profile, peritonitis, antibiotic treatment failure, mouse model, subgroup heterogeneity, molecular epidemiology

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