Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Inactivation of Mycobacteria by Radicals from Non-Thermal Plasma Jet

  • Lee, Chaebok (Department of Medical Science, Chungnam National University) ;
  • Subhadra, Bindu (Department of Medical Science, Chungnam National University) ;
  • Choi, Hei-Gwon (Department of Medical Science, Chungnam National University) ;
  • Suh, Hyun-Woo (Department of Microbiology, College of Medicine, Chungnam National University) ;
  • Uhm, Han. S (New Industry Convergence Technology R&D Center, Ajou University) ;
  • Kim, Hwa-Jung (Department of Medical Science, Chungnam National University)
  • Received : 2019.04.29
  • Accepted : 2019.08.19
  • Published : 2019.09.28
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Abstract

Mycobacterial cell walls comprise thick and diverse lipids and glycolipids that act as a permeability barrier to antibiotics or other chemical agents. The use of OH radicals from a non-thermal plasma jet (NTPJ) for the inactivation of mycobacteria in aqueous solution was adopted as a novel approach. Addition of water vapor in a nitrogen plasma jet generated OH radicals, which converted to hydrogen peroxide ($H_2O_2$) that inactivated non-pathogenic Mycobacterium smegmatis and pathogenic Mycobacterium tuberculosis H37Rv. A stable plasma plume was obtained from a nitrogen plasma jet with 1.91 W of power, killing Escherichia coli and mycobacteria effectively, whereas addition of catalase decreased the effects of the former. Mycobacteria were more resistant than E. coli to NTPJ treatment. Plasma treatment enhanced intracellular ROS production and upregulation of genes related to ROS stress responses (thiolrelated oxidoreductases, such as SseA and DoxX, and ferric uptake regulator furA). Morphological changes of M. smegmatis and M. tuberculosis H37Rv were observed after 5 min treatment with $N_2+H_2O$ plasma, but not of pre-incubated sample with catalase. This finding indicates that the bactericidal efficacy of NTPJ is related to the toxicity of OH and $H_2O_2$ radicals in cells. Therefore, our study suggests that NTPJ treatment may effectively control pulmonary infections caused by M. tuberculosis and nontuberculous mycobacteria (NTM) such as M. avium or M. abscessus in water.

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