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- W2079608096 abstract "Letting go may be hard to do, but Nancy Hoe, James Musser (National Institutes of Health, Hamilton, MO), and colleagues have found that certain successful Streptococci actually avoid attachment to host cells. This contrasts with the modus operandi of most pathogenic bacteria.Figure Bacteria with Sic (black bar) escape killing by phagocytes.The M1 serotype of the highly heterogeneous Group A Streptococcus (GAS) pathogen is the most common GAS strain found in severe disease outbreaks. M1 GAS are unique in that they produce streptococcal inhibitor of complement (Sic), the loss of which impairs the ability of the pathogen to colonize the upper respiratory tract of mice. “The old dogma was that successful colonization necessarily involves adherence,” says Hoe. “That's what led us to look at Sic, to see if it helps the bacteria adhere to host cells.”Unexpectedly, Sic inhibited adhesion to human epithelial cells. Sic was internalized into host cells, where it interacted with ezrin and moesin, proteins that link actin to the plasma membrane during the formation of microvilli. Host cells containing Sic lost their microvilli, structures that may be important for GAS–host cell interaction. Bacteria lacking Sic were also more susceptible to phagocytosis (another actin-dependent process) by leukocytes. Hoe believes Sic is important early in infection, when few bacteria are present and maintaining numbers is crucial. This enhanced ability to persist contributes to the ability of M1 GAS to cause epidemics. ▪Reference:Hoe, P., et al. 2002. Proc. Natl. Acad. Sci. USA. 99:7646–7651. [PubMed]" @default.
- W2079608096 created "2016-06-24" @default.
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- W2079608096 date "2002-06-03" @default.
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- W2079608096 title "Getting sick from Sic" @default.
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- W2079608096 doi "https://doi.org/10.1083/jcb1576rr1" @default.
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