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Ok-Jin Park 2 Articles
Propionate, together with triple antibiotics, inhibits the growth of Enterococci
Soyoung Jeong , Yunjae Lee , Cheol-Heui Yun , Ok-Jin Park , Seung Hyun Han
J. Microbiol. 2019;57(11):1019-1024.   Published online October 28, 2019
DOI: https://doi.org/10.1007/s12275-019-9434-7
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AbstractAbstract
Enterococci are Gram-positive facultative anaerobic bacteria that colonize the oral cavity and gastrointestinal tract. Enterococcal infections, mainly caused by Enterococcus faecalis and Enterococcus faecium, include apical periodontitis, endocarditis, and bloodstream infections. Recently, vancomycinresistant Enterococci are considered major pathogens that are common but difficult to treat, especially in nosocomial settings. Moreover, E. faecalis is closely associated with recurrent endodontic infections and failed endodontic treatment. In this study, we investigated the effects of short-chain fatty acids (SCFAs), acetate, propionate, and butyrate, which are metabolites fermented by gut microbiota, on the growth of Enterococci. Enterococci were cultured in the presence or absence of acetate, propionate, or butyrate, and the optical density at 600 nm was measured to determine bacterial growth. The minimum inhibitory concentration/minimum bactericidal concentration test was conducted. Bacteria were treated with a SCFA, together with clinically used endodontic treatment methods such as triple antibiotics (metronidazole, minocycline, and ciprofloxacin) and chlorhexidine gluconate (CHX) to determine the effects of combination treatment. Of the SCFAs, propionate had a bacteriostatic effect, inhibiting the growth of E. faecalis in a dose-dependent manner and also that of clinical strains of E. faecalis isolated from dental plaques. Meanwhile, acetate and butyrate had minimal effects on E. faecalis growth. Moreover, propionate inhibited the growth of other Enterococci including E. faecium. In addition, combination treatment of propionate and triple antibiotics led to further growth inhibition, whereas no cooperative effect was observed at propionate plus CHX. These results indicate that propionate attenuates the growth of Enterococci, suggesting propionate as a potential agent to control Enterococcal infections, especially when combined with triple antibiotics.

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  • A phase 2 randomized, placebo-controlled trial of inulin for the prevention of gut pathogen colonization and infection among patients admitted to the intensive care unit for sepsis
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    Jia-Ying Yan, Tsung-Han Lin, Yu-Tang Jong, Jun-Wei Hsueh, Sze-Hsien Wu, Hsiu-Jung Lo, Yee-Chun Chen, Chien-Hsiung Pan
    Frontiers in Cellular and Infection Microbiology.2024;[Epub]     CrossRef
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    International Journal of Biological Macromolecules.2022; 209: 825.     CrossRef
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  • RNA-Seq-based transcriptome analysis of methicillin-resistant Staphylococcus aureus growth inhibition by propionate
    Jintaek Im, Dongwook Lee, Ok-Jin Park, Sathishkumar Natarajan, Junhyung Park, Cheol-Heui Yun, Seung Hyun Han
    Frontiers in Microbiology.2022;[Epub]     CrossRef
  • Propionate Attenuates Growth of Oral Streptococci through Enhancing Methionine Biosynthesis
    Taehwan Park, Jintaek Im, A Reum Kim, Dongwook Lee, Sungho Jeong, Cheol-Heui Yun, Seung Hyun Han
    Journal of Microbiology and Biotechnology.2022; 32(10): 1234.     CrossRef
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    Tyler Alexander Cookson
    Frontiers in Cardiovascular Medicine.2021;[Epub]     CrossRef
  • Influence of operating conditions on the persistence of E. coli, enterococci, Clostridium perfringens and Clostridioides difficile in semi-continuous mesophilic anaerobic reactors
    Derongs Lorine, Druilhe Céline, Le Maréchal Caroline, Barbut Frédéric, Heurtevent Lorette, Buffet Julie, Martin Laure, Ziebal Christine, Poezevara Typhaine, Rouxel Sandra, Houard Emmanuelle, Syed Zaidi Rabab, Couturier Jeanne, Pourcher Anne-Marie
    Waste Management.2021; 134: 32.     CrossRef
  • Short-Chain Fatty Acids as a Potential Treatment for Infections: a Closer Look at the Lungs
    Marina Gomes Machado, Valentin Sencio, François Trottein, Andreas J. Bäumler
    Infection and Immunity.2021;[Epub]     CrossRef
  • The lung–gut axis during viral respiratory infections: the impact of gut dysbiosis on secondary disease outcomes
    Valentin Sencio, Marina Gomes Machado, François Trottein
    Mucosal Immunology.2021; 14(2): 296.     CrossRef
  • Enhanced biofilm formation of Streptococcus gordonii with lipoprotein deficiency
    Ok‐Jin Park, Solmin Jung, Taehwan Park, A Reum Kim, Dongwook Lee, Hyun Jung Ji, Ho Seong Seo, Cheol‐Heui Yun, Seung Hyun Han
    Molecular Oral Microbiology.2020; 35(6): 271.     CrossRef
Lipoteichoic acids of lactobacilli inhibit Enterococcus faecalis biofilm formation and disrupt the preformed biofilm
Solmin Jung , Ok-Jin Park , A Reum Kim , Ki Bum Ahn , Dongwook Lee , Kee-Yeon Kum , Cheol-Heui Yun , Seung Hyun Han
J. Microbiol. 2019;57(4):310-315.   Published online January 22, 2019
DOI: https://doi.org/10.1007/s12275-019-8538-4
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  • 52 Web of Science
  • 49 Crossref
AbstractAbstract
Enterococcus faecalis, a Gram-positive bacterium commonly isolated in patients with refractory apical periodontitis, invades dentin tubules easily and forms biofilms. Bacteria in biofilms, which contribute to recurrent and/or chronic inflammatory diseases, are more resistant to antimicrobial agents than planktonic cells and easily avoid phagocytosis. Although Lactobacillus plantarum lipoteichoic acid (Lp.LTA) is associated with biofilm formation, the effect of Lp.LTA on biofilm formation by E. faecalis is not clearly understood. In this study, we investigated whether Lp.LTA inhibits E. faecalis biofilm formation. The degree of biofilm formation was determined by using crystal violet assay and LIVE/DEAD bacteria staining. The quantification of bacterial growth was determined by measuring the optical density at 600 nm with a spectrophotometer. Formation of biofilms on human dentin slices was observed under a scanning electron microscope. E. faecalis biofilm formation was reduced by Lp.LTA treatment in a dose-dependent manner. Lp.LTA inhibited biofilm development of E. faecalis at the early stage without affecting bacterial growth. LTA from other Lactobacillus species such as Lactobacillus acidophilus, Lactobacillus casei, or Lactobacillus rhamnosus GG also inhibited E. faecalis biofilm formation. In particular, among LTAs from various lactobacilli, Lp.LTA showed the highest inhibitory effect on biofilms formed by E. faecalis. Interestingly, LTAs from lactobacilli could remove the biofilm preformed by E. faecalis. These inhibitory effects were also observed on the surface of human dentin slices. In conclusion, Lactobacillus species LTA inhibits biofilm formation caused by E. faecalis and it could be used as an anti-biofilm agent for prevention or treatment against E. faecalis-associated diseases.

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Ok-Jin Park 1 Article
Lipoteichoic Acid from Lacticaseibacillus rhamnosus GG as a Novel Intracanal Medicament Targeting Enterococcus faecalis Biofilm Formation
Ji-Young Yoon, Somin Park, Dongwook Lee, Ok-Jin Park, WooCheol Lee, Seung Hyun Han
J. Microbiol. 2024;62(10):897-905.   Published online September 30, 2024
DOI: https://doi.org/10.1007/s12275-024-00165-6
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AbstractAbstract
The demand for safe and effective endodontic medicaments to control Enterococcus faecalis biofilms, a contributor to apical periodontitis, is increasing. Recently, lipoteichoic acid (LTA) of family Lactobacillaceae has been shown to have anti-biofilm effects against various oral pathogens. Preliminary experiments showed that LTA purified from Lacticaseibacillus rhamnosus GG (Lgg.LTA) was the most effective against E. faecalis biofilms among LTAs from three Lactobacillaceae including L. rhamnosus GG, Lacticaseibacillus casei, and Lactobacillus acidophilus. Therefore, in this study, we investigated the potential of Lgg.LTA as an intracanal medicament in human root canals infected with E. faecalis. Twenty eight dentinal cylinders were prepared from extracted human teeth, where two-week-old E. faecalis biofilms were formed followed by intracanal treatment with sterile distilled water (SDW), N-2 methyl pyrrolidone (NMP), calcium hydroxide (CH), or Lgg.LTA. Bacteria and biofilms that formed in the root canals were analyzed by scanning electron microscopy and confocal laser scanning microscopy. The remaining E. faecalis cells in the root canals after intracanal medicament treatment were enumerated by culturing and counting. When applied to intracanal biofilms, Lgg.LTA effectively inhibited E. faecalis biofilm formation as much as CH, while SDW and NMP had little effect. Furthermore, Lgg.LTA reduced both live and dead bacteria within the dentinal tubules, indicating the possibility of minimal re-infection in the root canals. Collectively, intracanal application of Lgg.LTA effectively inhibited E. faecalis biofilm formation, implying that Lgg.LTA can be used as a novel endodontic medicament.

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