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Navigating fluoroquinolone resistance in Gram-negative bacteria: a comprehensive evaluation.

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Fluoroquinolone antibiotics face increasing bacterial resistance, driven by target enzyme mutations and altered cell membranes. Novel treatments targeting DNA gyrase and topoisomerase IV are crucial to combat resistant Gram-negative pathogens.

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Area of Science:

  • Microbiology
  • Pharmacology
  • Infectious Diseases

Background:

  • The rise of bacterial resistance to quinolone and fluoroquinolone antibiotics since the 1960s poses a significant global health threat.
  • The World Health Organization identified critical Gram-negative pathogens like *Klebsiella pneumoniae*, *Acinetobacter baumannii*, *Pseudomonas aeruginosa*, and *Escherichia coli* due to widespread resistance.

Purpose of the Study:

  • To review the current understanding of fluoroquinolone resistance mechanisms.
  • To highlight the emergence of novel fluoroquinolone-resistant mutants.
  • To emphasize the need for developing novel antimicrobial agents and treatments.

Main Methods:

  • Literature review of studies investigating fluoroquinolone resistance mechanisms.
  • Analysis of genetic mutations in target enzymes (DNA gyrase, topoisomerase IV).
  • Examination of the role of porins and efflux pumps in resistance.

Main Results:

  • Mutations in DNA gyrase and topoisomerase IV are the primary mechanisms conferring high-level fluoroquinolone resistance.
  • Alterations in porins and efflux pumps also contribute significantly to resistance.
  • Emergence of novel resistant mutants necessitates the development of new therapeutic strategies.

Conclusions:

  • Understanding fluoroquinolone resistance mechanisms is critical for developing effective treatments.
  • Novel antimicrobial agents targeting DNA gyrase/topoisomerase IV via alternative pathways are under development.
  • Continued research is imperative to combat the growing challenge of antibiotic resistance.