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http://dx.doi.org/10.5352/JLS.2012.22.6.788

Effects of Natural Compounds from Various Plant Eradicate the Persister Cell of Edwardsiella tarda Treated with Antibiotics of Florfenicol and Amoxicillin  

Kim, Na-Kyoung (Department of Biotechnology, Pukyoung National University)
Kweon, Dae-Hyuk (Department of Biotechnology and bioeineering, Sungkyunkwan University)
Kim, Sung-Koo (Department of Biotechnology, Pukyoung National University)
Publication Information
Journal of Life Science / v.22, no.6, 2012 , pp. 788-793 More about this Journal
Abstract
High concentration of antibiotics has been used to treat the outbreak of edwardsiellosis caused by Edwardsiella tarda in aquaculture. However, not all of the bacteria have been killed with high concentrations of antibiotics treatment by the formation of persister cells with a dormant state. The main objective of this study was to kill persister cell using antibiotics with the addition of natural plant compounds. Antibiotics used in this study consist of 100 mg/ml florfenicol and 100 mg/ml amoxicillin. Ten natural plant compounds with persister cell inhibitor activity to E. coli were obtained from Protein Engineering and Systems Biology Lab. of Sungkyunkwan University. The persister cell inhibition activities of those natural plant compounds were evaluated in test tube. Concentrations of the antibiotics were in the ranges of 25~200 ${\mu}g/ml$. The persister cell formation was observed after 16 hours of culture. Persister cells were killed by antibiotics with natural plant compounds. Among ten natural plant compounds, Gynostemma pentaphyllum, Mallotus japonicus, and Orixa japonica showed persister cell formation inhibition activities. The optimal concentrations of G. pentaphyllum, M. japonicus, and O. japonica for the inhibitor of persister cell formation were 100 ${\mu}g/ml$, 100 ${\mu}g/ml$, and 200 ${\mu}g/ml$, respectively. In vivo study was carried out to evaluate the effect of the antibiotics with natural plant compounds using aquacultural fish, olive flounder, as test animals. G. pentaphyllum, M. japonicus, and O. japonica of 30 ${\mu}g/ml$, 10 ${\mu}g/ml$, and 10 ${\mu}g/ml$ with antibiotics reduced cumulative mortalities, showing the effectiveness of persister cell inhibition.
Keywords
Persister cell; edwardsiellosis; Edwardsiella tarda; olive flounder;
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