title: Influence of glucose concentrations on biofilm formation, motility, exoprotease production, and quorum sensing in Aeromonas hydrophila.
abstract: Aeromonas hydrophila recently has received increased attention because it is opportunistic and a primary human pathogen. A. hydrophila biofilm formation and its control are a major concern for food safety because biofilms are related to virulence. Therefore, we investigated  biofilm formation, motility inhibition, quorum sensing, and exoprotease production of this opportunistic pathogen in response to various glucose concentrations from 0.05 to 2.5% (wt/vol). More than 0.05% glucose significantly impaired (P < 0.05) quorum sensing, biofilm formation,  protease production, and swarming and swimming motility, whereas bacteria treated with 0.05% glucose had activity similar to that of the control (0% glucose). A stage shift biofilm assay revealed that the addition of glucose (2.5%) inhibited initial biofilm formation but not later stages.  However, addition of quorum sensing molecules N-3-butanoyl-DL-homoserine lactone and N-3-hexanoyl homoserine lactone partially restored protease production, indicating that quorum sensing is controlled by glucose concentrations. Thus, glucose present in food or added as a preservative  could regulate acyl-homoserine lactone quorum sensing molecules, which mediate biofilm formation and virulence in A. hydrophila.
authors: School of Food Science and Technology, Chung-Ang University, 72-1 Nae-Ri, Daedeok-Myun, Ansung, Kyunggido 456-756, South Korea.
authors: Iqbal Kabir
authors: IK
authors: Jahid
authors: Na-Young
authors: NY
authors: Lee
authors: Anna
authors: A
authors: Kim
authors: Sang-Do
authors: SD
authors: Ha
mesh_terms: D016980:Aeromonas hydrophila / Q000472:pathogenicity* / Q000502:physiology*; D018441:Biofilms / Q000254:growth & development*; D004305:Dose-Response Relationship, Drug; D020689:Exopeptidases / Q000096:biosynthesis; D005516:Food Microbiology; D005947:Glucose / Q000378:metabolism* / Q000494:pharmacology; D006801:Humans; D053038:Quorum Sensing; D014774:Virulence
chemical_list: D020689:Exopeptidases; D005947:Glucose