title: Acyl homoserine lactone-based quorum sensing stimulates biofilm formation by Salmonella Enteritidis in anaerobic conditions.
abstract: Quorum sensing regulates a variety of phenotypes in bacteria including the production of virulence factors. Salmonella spp. have quorum sensing systems mediated by three autoinducers (AI-1, AI-2, and AI-3). The AI-1-mediated system is incomplete in that the bacterium relies on the synthesis of signaling molecules by other microorganisms. This study aimed to evaluate the influence of the AI-1 N-dodecanoyl-DL-homoserine lactone (C12-HSL) on the growth, motility, adhesion, and biofilm formation of Salmonella enterica serovar Enteritidis PT4 578 on a polystyrene surface. Experiments were conducted at 37 °C in anaerobic tryptone soy broth supplemented with C12-HSL and/or a mixture of four synthetic furanones, at the concentration of 50 nM each. The planktonic growth, adhesion, swarming, and twitching motility were not altered in the presence of C12-HSL and/or furanones under anaerobic conditions. However, C12-HSL induced biofilm formation after 36 h of cultivation as determined by quantification of biofilm formation, by enumeration of adhered cells to polystyrene coupons, and finally by imaging the presence of multilayered cells on an epifluorescence microscope. When furanones were present in the medium, an antagonistic effect against C12-HSL on the biofilm development was observed. The results demonstrate an induction of biofilm formation in Salmonella Enteritidis by AI-1 under anaerobic conditions. Considering that Salmonella does not produce AI-1 but respond to it, C12-HSL synthesized by other bacterial species could trigger biofilm formation by this pathogen in conditions that are relevant for its pathogenesis.
authors.affiliation: Department of Microbiology, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
authors.forename: Felipe Alves de
authors.initials: FA
authors.lastname: Almeida
authors.affiliation: Center of Nature Science, Universidade Federal de São Carlos, Buri, São Paulo, Brazil.
authors.forename: Natan de Jesus
authors.initials: NJ
authors.lastname: Pimentel-Filho
authors.affiliation: Department of Food and Experimental Nutrition, Food Research Center, Universidade de São Paulo, São Paulo, São Paulo, Brazil.
authors.forename: Uelinton Manoel
authors.initials: UM
authors.lastname: Pinto
authors.affiliation: Department of Microbiology, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil.
authors.forename: Hilário Cuquetto
authors.initials: HC
authors.lastname: Mantovani
authors.affiliation: Department of General Biology, Universidade Federal de Viçosa, Viçosa, Minas Gerais, Brazil.
authors.forename: Leandro Licursi de
authors.initials: LL
authors.lastname: Oliveira
authors.affiliation: Department of Microbiology, Universidade Federal de Viçosa, Viçosa, Minas Gerais, 36570-900, Brazil. mvanetti@ufv.br.
authors.forename: Maria Cristina Dantas
authors.identifier: http://orcid.org/0000-0002-8020-6601
authors.initials: MC
authors.lastname: Vanetti
mesh_terms: D015107:4-Butyrolactone / Q000031:analogs & derivatives* / Q000494:pharmacology; D000693:Anaerobiosis; D018441:Biofilms / Q000187:drug effects*; D006714:Homoserine / Q000031:analogs & derivatives* / Q000494:pharmacology; D053038:Quorum Sensing; D012477:Salmonella enteritidis / Q000187:drug effects* / Q000502:physiology*
chemical_list: C516096:N-dodecanoyl-DL-homoserine lactone; D006714:Homoserine; D015107:4-Butyrolactone
keywords: Adhesion; Autoinducer; Biofilm; Cellular communication; Furanone