Synergistic effect of [10]-gingerol and aminoglycosides against vancomycin-resistant enterococci (VRE)

Chihiro Nagoshi, Sumiko Shiota, Teruo Kuroda, Tsutomu Hatano, Takashi Yoshida, Reiko Kariyama, Tomofusa Tsuchiya

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


An extract from ginger (root of Zingiber officinale) reduced the minimum inhibitory concentrations (MICs) of aminoglycosides in vancomycin-resistant enterococci (VRE). The effective compound was isolated and identified as [10]-gingerol. In the presence of [10]-gingerol at 1/10 concentration of its own MIC, the MIC of arbekacin was lowered by 1/32 to 1/16. [10]-Gingerol also reduced the MICs of other aminoglycosides, and of bacitracin and polymixin B, but not of other antimicrobial agents tested. Because [10]-gingerol reduced the MICs of several aminoglycosides both in strains possessing or lacking aminoglycoside-modification enzymes, it seems that the effect of [10]-gingerol is not related to these enzymes, which mainly confer bacterial resistance against aminoglycosides. It seemed that a detergent-like effect of [10]-gingerol potentiated the antimicrobial activity of the aminoglycosides. In fact, some detergents such as sodium dodecyl sulfate (SDS) and Triton X-100 reduced the MICs of aminoglycosides, bacitracin and polymixin B in VRE. Since the intrinsic resistance to aminoglycosides in enterococci is due to low level of entry of the drugs into the cells, increase in the membrane permeability caused by [10]-gingerol will enhance the influx of aminoglycosides into enterococcal cells.

Original languageEnglish
Pages (from-to)443-447
Number of pages5
JournalBiological and Pharmaceutical Bulletin
Issue number3
Publication statusPublished - Mar 2006


  • Aminoglycoside
  • Arbekacin
  • Vancomycin-resistant enterococci (VRE)
  • [10]-gingerol

ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science


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