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Abstrakt
Evaluation of Anti-Quorum Sensing Activity of 97 Indigenous Plant Extracts From Korea through Bioreporter Bacterial Strains Chromobacterium violaceum and Pseudomonas aeruginosa
Dereje Damte, Elias Gebru, Seung-Jin Lee, Joo-Won Suh and Seung-Chun Park
Quorum sensing (QS) is a recently discovered chemical communication system that enhances survival of bacteria, as a group allowing resident bacteria to assume specialized roles vital for intra- and inter bacterial gene regulation, and for keeping bacterial colonies intact. Furthermore, with the continuing emergence and spread of multidrug-resistant bacteria, antipathogenic strategy to combat bacterial infections through the interruption of quorum sensing controlled virulence factors had been shown to receive increased attention. With this prospect in the current study, we attempt to screen anti-quorum sensing activity of 97 indigenous plant extracts from Korea, through biomonitor bacterial strains, Chromobacterium violaceum (CV12472) and Pseudomonas aeruginosa (PAO1). Standard disc-diffusion assays were used to detect anti-quorum sensing activity (ring of colorless, but viable cells around the disk), of the plant extracts for CV12472. A special swarm media that allow swarming motility growth of POA1 was used to conduct inhibition of swarming motility assay. Minimum Inhibitory Concentration (MIC) test for the 97 plant extracts against bioreporter strains (CV12472 and PAO1) revealed antibacterial activity of three plant extracts (Potentilla cryptotaeniae, Viburnum carlesii and Prunus armeniaca var. ansu). Out of the 97 plant extracts, significant inhibition of pigment production were detected by six plant extracts in CV12472, while 16 plant extracts had shown inhibition of swarming motility in POA1. In conclusion, a total of 18 plant extracts were screened for their anti-quorum sensing activity by the two bioreporter strains. Of the 18 plant extracts, four had shown anti-quorum activities in both bioreporter strains.