Involvement of Reactive Oxygen Species in the Action of Ciprofloxacin against Escherichia coli
| Autor: | Manish Goswami, Narendra Jawali, Suhas H. Mangoli |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Antioxidant
medicine.medical_treatment Ascorbic Acid Microbial Sensitivity Tests medicine.disease_cause Antioxidants Microbiology Superoxide dismutase Anti-Infective Agents Ciprofloxacin medicine Escherichia coli Pharmacology (medical) Mechanisms of Action: Physiological Effects Antibacterial agent Pharmacology chemistry.chemical_classification Reactive oxygen species biology Dose-Response Relationship Drug Chemistry Superoxide Dismutase Peroxiredoxins Ascorbic acid Catalase Glutathione Infectious Diseases Peroxidases biology.protein Reactive Oxygen Species Oxidative stress medicine.drug |
| Popis: | Ciprofloxacin is an important and commonly used member of the fluoroquinolone group of antibiotics. Ciprofloxacin inhibits DNA topoisomerase II and DNA topoisomerase IV activities, eventually leading to bacterial cell death. In addition, an increase of reactive oxygen species in the bacterial cells in response to ciprofloxacin has been shown. We investigated the role of reactive oxygen species in the antibacterial action of ciprofloxacin by studying the effects of different antioxidant compounds on ciprofloxacin susceptibility of Escherichia coli . Among the antioxidants checked, glutathione and ascorbic acid provided substantial protection against ciprofloxacin. The involvement of superoxide anion (O 2 − ) and hydrogen peroxide (H 2 O 2 ) in the antibacterial action of ciprofloxacin was analyzed using superoxide dismutase, catalase, and alkyl hydroperoxide reductase knockout strains of E. coli . The effects of multicopy sod genes on ciprofloxacin susceptibility of E. coli were also analyzed. On the basis of our results, we conclude that O 2 − and H 2 O 2 may be involved in antibacterial action of ciprofloxacin. Our findings that glutathione gave protection against other fluoroquinolones and not against nonfluoroquinolone antibiotics imply that reactive oxygen species may have a similar role in the antibacterial action of all these fluoroquinolones and that glutathione-mediated protection is not a general phenomenon but specific to fluoroquinolones. These observations are of significance, as fluoroquinolones are important antibiotics with immense therapeutic value, and the effectiveness of treatment by these drugs may be affected by dietary intake and cellular levels of these antioxidants. |
| Databáze: | OpenAIRE |
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