Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Inhibitory Effect of Transition Metal Gallium [Ga(NO3)3] on Biofilm Formation by Fish Pathogens

전이금속 갈륨(Ga(NO3)3)을 이용한 biofilm을 형성하는 어류질병세균의 억제

  • Kim, Dong-Hwi (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University) ;
  • Dharaneedharan, Subramanian (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University) ;
  • Jang, Young-Hwan (Jeju Special Self-Governing Province Ocean and Fisheries Research Institute) ;
  • Heo, Moon-Soo (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University)
  • Received : 2016.07.28
  • Accepted : 2016.10.04
  • Published : 2016.12.28
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Abstract

The prevalence of pathogenic bacteria such as Streptococcus parauberis (Sp), Streptococcus iniae (Si), and Edwardsiella tarda (Et) in flounder fish farms in Jeju Island and their management by gallium treatment was studied. Sp, Si, and Et were found to exhibit a low rate of cell growth and high biofilm formation. Hence, in the present study, cell growth and biofilm formation were measured spectrophotometrically 72 h after the addition of different concentrations of gallium (2, 4, or 8 mg/ml). In addition, cell death was measured by resazurin and propidium iodide staining assays. The results showed that bacterial cell death increased and biofilm formation decreased with an increasing concentration of gallium. Hence, the present study signifies that the use of gallium against bacterial pathogens could be useful for disease management in flounder farms.

제주도 넙치 양식장에서 주로 발생하는 어류질병세균인 S. parauberis, S. iniae, E. tarda에 대한 피해를 줄이고자 갈륨을 이용하여 어류질병세균을 억제하고자 한다. 본 연구진은 Sp, Si, Et의 생육도와 biofilm 형성능을 확인하였으며, 세균의 성장도와 biofilm 형성능간의 특정한 패턴은 없었으며 세균의 성장도가 높다 하더라도 biofilm을 활발히 형성하지 않음을 알 수 있었다. 어류질병세균이 형성하는 biofilm을 저해하기 위해 갈륨을 2.0, 4.0, 8.0 mg/ml로 첨가하여 저해능을 확인한 결과 72시간째 biofilm의 형성이 크게 저해되는 것을 확인하였다. 또한 biofilm을 저해하는 동시에 균주의 사멸능을 확인하기 위해 resazurin assay와 propidium iodide를 이용하여 염색한 결과 갈륨의 농도에 따라 균주의 사멸이 증가하는 것을 확인하였다. 이에 따라 in vitro 상에서 갈륨이 어류질병세균의 biofilm을 억제하는 동시에 균주를 사멸시키는 물질로서 가치가 있다고 사료된다.

Keywords

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