title: Influence of clove oil on certain quorum-sensing-regulated functions and biofilm of Pseudomonas aeruginosa and Aeromonas hydrophila.
abstract: Quorum sensing (QS) plays an important role in virulence, biofilm formation and survival of many pathogenic bacteria including Pseudomonas aeruginosa. This signalling pathway is considered as novel and promising target for anti-infective agents. In the present investigation, effect of the Sub-MICs of clove oil on QS regulated virulence factors and biofilm formation was evaluated against P. aeruginosa PAO1 and Aeromonas hydrophila WAF-38 strain. Sub-inhibitory concentrations of the clove oil demonstrated statistically significant reduction of las- and rhl-regulated virulence factors such as LasB, total protease, chitinase and pyocyanin production, swimming motility and exopolysaccharide production. The biofilm forming capability of PAO1 and A. hydrophila WAF-38 was also reduced in a concentration-dependent manner at all tested sub-MIC values. Further, the PAO1-preinfected Caenorhabditis elegans displayed an enhanced survival when treated with 1.6 percent v/v of clove oil. The above findings highlight the promising anti-QS-dependent therapeutic function of clove oil against P. aeruginosa.
authors.affiliation: Department of Agricultural Microbiology, Aligarh Muslim University, Aligarh 202 002, India.
authors.forename: Fohad Mabood
authors.initials: FM
authors.lastname: Husain
authors.forename: Iqbal
authors.initials: I
authors.lastname: Ahmad
authors.forename: Mohammad
authors.initials: M
authors.lastname: Asif
authors.forename: Qudsia
authors.initials: Q
authors.lastname: Tahseen
mesh_terms: D016980:Aeromonas hydrophila / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D018441:Biofilms / Q000187:drug effects*; D017173:Caenorhabditis elegans / Q000382:microbiology; D045783:Clove Oil / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D050296:Microbial Viability / Q000187:drug effects; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000502:physiology*; D053038:Quorum Sensing / Q000187:drug effects*; D037521:Virulence Factors / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D045783:Clove Oil; D037521:Virulence Factors