Roles of the glutathione- and thioredoxin-dependent systems in the Escherichia coli responses to ciprofloxacin and ampicillin.

Abstract:

:Recently, it was proposed that some antibiotics stimulate the production of reactive oxygen species (ROS), which contribute to cell death. Later, other research groups have provided arguments against ROS-mediated killing of bacteria by antibiotics. At present, there remain a number of unanswered questions in understanding of the role of ROS in killing by antibiotics. Mutants of Escherichia coli in components of the thioredoxin and glutaredoxin redox pathways used in this study possess a great variability in antioxidant activity, and they therefore are a useful model for the investigation of the role of oxidative stress in bactericidal effect of antibiotics. Statistical analysis did not reveal a significant correlation between the susceptibility of the mutants to ciprofloxacin and ampicillin and their resistance to peroxide stress. However, we found strong reverse correlations between the bactericidal activity of antibiotics and the specific growth rate of these mutants at the moment of drug addition. Supplements changing the level of intra- and extracellular glutathione considerably affected E. coli susceptibility to ciprofloxacin and ampicillin. The effect of GSH precursors on bactericidal activity of antibiotics was also observed in gshA mutants.

journal_name

Arch Microbiol

journal_title

Archives of microbiology

authors

Smirnova G,Muzyka N,Lepekhina E,Oktyabrsky O

doi

10.1007/s00203-016-1247-z

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

913-21

issue

9

eissn

0302-8933

issn

1432-072X

pii

10.1007/s00203-016-1247-z

journal_volume

198

pub_type

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