國家衛生研究院 NHRI:Item 3990099045/2863
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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/2863


    Title: Glucosyltransferases of viridans streptococci are modulins of interleukin-6 induction in infective endocarditis
    Authors: Shun, CT;Lu, SY;Yeh, CY;Chiang, CP;Chia, JS;Chen, JY
    Contributors: National Institute of Cancer Research
    Abstract: The glucosyltransferases (GTFs) of viridans streptococci, common pathogens of infective endocarditis, are extracellular proteins that convert sucrose into exopolysaccharides and glucans. GTFs B, C, and D of Streptococcus mutans are modulins that induce, in vitro and in vivo, the production of cytokines, in particular interleukin-6 (IL-6), from monocytes. The roles of S. mutans GTFs in infectivity and inflammation in situ were tested in a rat experimental model of endocarditis. No significant differences in infectivity, in terms of 95% infective dose and densities of bacteria inside vegetations, were observed between laboratory strain GS-5 and two clinical isolates or isogenic mutant NHS1DD, defective in the expression of GTFs. In aortic valves and surrounding tissues, IL-6 was detected by Western blots and immunostaining 24 h after GS-5 infection, was maintained over 72 h, and was followed by production of tumor necrosis factor alpha but not IL-1 beta. Animals infected with NHS1DD showed markedly lower levels of IL-6 (less than 5% of that of parental GS-5-infected rats), while tumor necrosis factor alpha was unaffected. In contrast, animals infected with NHR1DD, another isogenic mutant expressing only GtfB, showed a much smaller reduction (down to 56%). These results suggest that GTFs are specific modulins that act during acute inflammation, inducing IL-6 from endothelial cells surrounding the infected valves without affecting bacterial colonization in vegetations, and that IL-6 might persist in chronic inflammation in endocarditis.
    Keywords: Immunology;Infectious Diseases
    Date: 2005-06
    Relation: Infection and Immunity. 2005 Jun;73(6):3261-3270.
    Link to: http://dx.doi.org/10.1128/IAI.73.6.3261-3270.2005
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0019-9567&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000229485900007
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=19744367811
    Appears in Collections:[Jen-Yang Chen] Periodical Articles

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