title: Isolate-specific effects of patulin, penicillic Acid and EDTA on biofilm formation and growth of dental unit water line biofilm isolates.
abstract: Dental unit water line (DUWL) contamination by opportunistic pathogens has its significance in nosocomial infection of patients, health care workers, and life-threatening infections to immunocompromized persons. Recently, the quorum sensing (QS) system of DUWL isolates has been found to affect their biofilm-forming ability, making it an attractive target for antimicrobial therapy. In this study, the effect of two quorum-sensing inhibitory compounds (patulin; PAT, penicillic acid; PA) and EDTA on planktonic growth, AI-2 signalling and in vitro biofilm formation of Pseudomonas aeruginosa, Achromobacter xylosoxidans and Achromobacter sp. was monitored. Vibrio harveyi BB170 bioassay and crystal violet staining methods were used to detect the AI-2 monitoring and biofilm formation in DUWL isolates, respectively. The V. harveyi BB170 bioassay failed to induce bioluminescence in A. xylosoxidans and Achromobacter sp., while P. aeruginosa showed AI-2 like activity suggesting the need of some pretreatments prior to bioassay. All strains were found to form biofilms within 72 h of incubation. The QSIs/EDTA combination have isolate-specific effects on biofilm formation and in some cases it stimulated biofilm formation as often as it was inhibited. However, detailed information about the anti-biofilm effect of these compounds is still lacking.
authors.affiliation: Department of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan. iramliaq@hotmail.com
authors.forename: Iram
authors.initials: I
authors.lastname: Liaqat
authors.forename: Robert Thomas
authors.initials: RT
authors.lastname: Bachmann
authors.forename: Anjum Nasim
authors.initials: AN
authors.lastname: Sabri
authors.forename: Robert G J
authors.initials: RG
authors.lastname: Edyvean
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000145:classification / Q000187:drug effects* / Q000254:growth & development / Q000302:isolation & purification; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D003770:Dental Offices; D004492:Edetic Acid / Q000494:pharmacology*; D006714:Homoserine / Q000031:analogs & derivatives / Q000378:metabolism; D006801:Humans; D007783:Lactones / Q000378:metabolism; D008969:Molecular Sequence Data; D010365:Patulin / Q000494:pharmacology*; D010398:Penicillic Acid / Q000494:pharmacology*; D053038:Quorum Sensing / Q000187:drug effects; D017422:Sequence Analysis, DNA; D015398:Signal Transduction / Q000187:drug effects; D014871:Water Microbiology; D014881:Water Supply
chemical_list: D000900:Anti-Bacterial Agents; D004269:DNA, Bacterial; D007783:Lactones; C091088:N-octanoylhomoserine lactone; D006714:Homoserine; D010365:Patulin; D004492:Edetic Acid; D010398:Penicillic Acid