Sub-inhibitory concentrations of trans-cinnamaldehyde attenuate virulence in cronobacter sakazakii in vitro

Mary Anne Roshni Amalaradjou, Kwang Sik Kim, Kumar Venkitanarayanan

Research output: Contribution to journalArticle

Abstract

Cronobacter sakazakii is a foodborne pathogen, which causes a life-threatening form of meningitis, necrotizing colitis and meningoencephalitis in neonates and children. Epidemiological studies implicate dried infant formula as the principal source of C. sakazakii. In this study, we investigated the efficacy of sub-inhibitory concentrations (SIC) of trans-cinnamaldehyde (TC), an ingredient in cinnamon, for reducing C. sakazakii virulence in vitro using cell culture, microscopy and gene expression assays. TC significantly (p ≤ 0.05) suppressed C. sakazakii adhesion to and invasion of human and rat intestinal epithelial cells, and human brain microvascular endothelial cells. In addition, TC inhibited C. sakazakii survival and replication in human macrophages. We also observed that TC reduced the ability of C. sakazakii to cause cell death in rat intestinal cells, by inhibiting nitric oxide production. Results from gene expression studies revealed that TC significantly downregulated the virulence genes critical for motility, host tissue adhesion and invasion, macrophage survival, and LPS (Lipopolysaccharide) synthesis in C. sakazakii. The efficacy of TC in attenuating these major virulence factors in C. sakazakii underscores its potential use in the prevention and/or control of infection caused by this pathogen.

Original languageEnglish (US)
Pages (from-to)8639-8655
Number of pages17
JournalInternational journal of molecular sciences
Volume15
Issue number5
DOIs
StatePublished - May 15 2014

Keywords

  • Attenuation
  • C. sakazakii
  • Sub-inhibitory concentration
  • Trans-cinnamaldehyde
  • Virulence

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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