國家衛生研究院 NHRI:Item 3990099045/3098
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/3098


    Title: The two-component system ScnRK of Streptococcus mutans affects hydrogen peroxide resistance and murine macrophage killing
    Authors: Chen, PM;Chen, HC;Ho, CT;Jung, CJ;Lien, HT;Chen, JY;Chia, JS
    Contributors: National Institute of Cancer Research
    Abstract: To survive macrophage killing is critical in the pathogenesis of viridians streptococci-induced infective endocarditis (IE). Streptococcus mutans, an opportunistic IE pathogen, generally does not survive well phagocytic killing in murine macrophage RAW 264.7 cells. A putative two-component system (TCS), ScnR/ScnK from S. mutans, was investigated to elucidate the mechanisms underlying bacteria-cellular interaction in this study. Both the wild-type and mutant strains were phagocytosed by RAW 264.7 cells at a comparable rate and an increased intracellular susceptibility during a 5 h incubation period was observed with the scnRK-null mutants. The amount of reactive oxygen species (ROS) in activated macrophages was reduced significantly after ingesting wild-type, but not scnRK-null mutant strains, suggesting that increased macrophage killing of these mutants is due to the impaired ability of S. mutans to counteract ROS. Additionally, both scnR- or scnRK-null mutants were more susceptible to hydrogen peroxide. Interestingly, scnRK expression was unaffected by hydrogen peroxide. These experimental results indicate that scnRK is important in counteracting oxidative stress in S. mutans, and decreased susceptibility to phagocytic killing is at least partly attributable to inhibition of intracellular ROS formation.
    Keywords: Immunology;Microbiology;Virology
    Date: 2008-03
    Relation: Microbes and Infection. 2008 Mar;10(3):293-301.
    Link to: http://dx.doi.org/10.1016/j.micinf.2007.12.006
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1286-4579&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000255672300011
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=41049103061
    Appears in Collections:[Jen-Yang Chen] Periodical Articles

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