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Volume 171, Issue 3

Menadione reduces the expression of virulence- and colonization-associated genes in Open Access

Abstract

Novel treatment options are needed for the gastric pathogen due to its increasing antibiotic resistance. The vitamin K analogue menadione has been extensively studied due to interest in its anti-bacterial and anti-cancer properties. Here, we investigated the effects of menadione on growth, viability, antibiotic resistance, motility and gene expression using clinical isolates. The MIC of menadione was 313 µM for 11/13 isolates and 156 µM for 2/13 isolates. The minimum bactericidal concentrations were 1.25–2.5 mM, indicating that concentrations in the micromolar range were bacteriostatic rather than bactericidal. We were not able to experimentally evolve resistance to menadione . Sub-MIC menadione (16 µM for 24 h) did not significantly inhibit bacterial growth but significantly (<0.05) changed the expression of 1291/1615 (79.9%) genes encoded by strain 322A. The expression of the virulence factor genes and was downregulated in the presence of sub-MIC menadione, while genes involved in stress responses were upregulated. Sub-MIC menadione significantly (<0.0001) inhibited the motility of , consistent with the predicted effects of the observed significant (<0.05) downregulation of , upregulation of and changes in the expression of flagellar assembly pathway genes seen in the transcriptomic analysis. Through in-depth interrogation of transcriptomic data, we concluded that sub-MIC menadione elicits a general stress response in with survival in the stationary phase likely mediated by the upregulation of and . Sub-MIC menadione caused some modest increases in susceptibility to antibiotics, but the effect was variable with strain and antibiotic type and did not reach statistical significance. Menadione (78 µM) was minimally cytotoxic to human gastric adenocarcinoma (AGS) cells after 4 h but caused a significant loss of cell viability after 24 h. Given its inhibitory effects on bacterial growth, motility and expression of virulence- and colonization-associated genes, menadione at low micromolar concentrations may have potential utility as a virulence-attenuating agent against .

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): antimicrobial resistance , cagA , motility , stress response and transcriptomics
Funding
This study was supported by the:
  • Nottingham Trent University
    • Principal Award Recipient: StephenThompson
© 2025 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2025-03-12
2026-02-19

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Menadione reduces the expression of virulence- and colonization-associated genes in Helicobacter pylori
Microbiology 171, 001539 (2025); https://doi.org/10.1099/mic.0.001539
/content/journal/micro/10.1099/mic.0.001539
/content/journal/micro/10.1099/mic.0.001539
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