Update on fluoroquinolone resistance in Helicobacter pylori : new mutations leading to resistance and first description of a gyrA polymorphism associated with hypersusceptibility

Abstract Helicobacter pylori eradication by standard therapy is decreasing due to clarithromycin and metronidazole resistance. Fluoroquinolones are valuable drugs for alternative therapy, but their activity needs to be updated. We determined minimum inhibitory concentrations (MICs) of the newly mark...

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Veröffentlicht in:International journal of antimicrobial agents 2007-04, Vol.29 (4), p.389-396
Hauptverfasser: Cattoir, Vincent, Nectoux, Juliette, Lascols, Christine, Deforges, Lionel, Delchier, Jean-Charles, Megraud, Francis, Soussy, Claude-James, Cambau, Emmanuelle
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container_end_page 396
container_issue 4
container_start_page 389
container_title International journal of antimicrobial agents
container_volume 29
creator Cattoir, Vincent
Nectoux, Juliette
Lascols, Christine
Deforges, Lionel
Delchier, Jean-Charles
Megraud, Francis
Soussy, Claude-James
Cambau, Emmanuelle
description Abstract Helicobacter pylori eradication by standard therapy is decreasing due to clarithromycin and metronidazole resistance. Fluoroquinolones are valuable drugs for alternative therapy, but their activity needs to be updated. We determined minimum inhibitory concentrations (MICs) of the newly marketed fluoroquinolones (levofloxacin, moxifloxacin and gatifloxacin) and assessed the prevalence of resistance in 128 H. pylori strains isolated in 2004–2005. The quinolone resistance-determining region (QRDR) of gyrA was sequenced for all strains. Gatifloxacin MICs (MIC50 = 0.25 mg/L) were two- to four-fold lower than those of the other fluoroquinolones. The prevalence of resistance (ciprofloxacin MIC > 1 mg/L) was 17.2% (22 strains). All resistant strains harboured one gyrA mutation at codons 86, 87 or 91, including three new mutations (Asp86Asn, Thr87Ile and Asn87Tyr). Ciprofloxacin-susceptible strains were devoid of such gyrA mutations, but harboured a polymorphism at codon 87 that distinguished 18 isolates (17%) with a Thr87 like the reference strain J99 from 88 strains with Asn87 like the reference strain 26695. Strains with Thr87 were four-fold more susceptible to nalidixic acid, pefloxacin, ciprofloxacin and levofloxacin and were equally susceptible to moxifloxacin and gatifloxacin. The high rate of quinolone resistance in H. pylori requires the use/implication of a ‘test and treat’ strategy that can confidently rely on QRDR gyrA sequencing.
doi_str_mv 10.1016/j.ijantimicag.2006.11.007
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subjects Amino Acid Sequence
Anti-Bacterial Agents - therapeutic use
Antibiotics. Antiinfectious agents. Antiparasitic agents
Bacterial diseases
Bacterial diseases of the digestive system and abdomen
Biological and medical sciences
Ciprofloxacin - pharmacology
DNA gyrase
DNA Gyrase - drug effects
DNA Gyrase - genetics
Drug Resistance, Bacterial - genetics
Fluoroquinolones - pharmacology
Fluoroquinolones - therapeutic use
gyrA polymorphism
Helicobacter Infections - drug therapy
Helicobacter Infections - microbiology
Helicobacter pylori
Helicobacter pylori - drug effects
Helicobacter pylori - genetics
Human bacterial diseases
Humans
Infectious Disease
Infectious diseases
Medical sciences
Microbial Sensitivity Tests
Molecular diagnosis
Molecular Sequence Data
Mutation
Pharmacology. Drug treatments
Polymorphism, Genetic
QRDR
Quinolones
title Update on fluoroquinolone resistance in Helicobacter pylori : new mutations leading to resistance and first description of a gyrA polymorphism associated with hypersusceptibility
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