Type three secretion system-mediated escape of Burkholderia pseudomallei into the host cytosol is critical for the activation of NFκB

Boon Eng Teh, Christopher Todd French, Yahua Chen, Isabelle Gek Joo Chen, Ting Hsiang Wu, Enrico Sagullo, Pei Yu Chiou, Michael A. Teitell, Jeff F. Miller, Yunn Hwen Gan

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Background: Burkholderia pseudomallei is the causative agent of melioidosis, a potentially fatal disease endemic in Southeast Asia and Northern Australia. This Gram-negative pathogen possesses numerous virulence factors including three "injection type" type three secretion systems (T3SSs). B. pseudomallei has been shown to activate NFκB in HEK293T cells in a Toll-like receptor and MyD88 independent manner that requires T3SS gene cluster 3 (T3SS3 or T3SSBsa). However, the mechanism of how T3SS3 contributes to NFκB activation is unknown. Results: Known T3SS3 effectors are not responsible for NFκB activation. Furthermore, T3SS3-null mutants are able to activate NFκB almost to the same extent as wildtype bacteria at late time points of infection, corresponding to delayed escape into the cytosol. NFκB activation also occurs when bacteria are delivered directly into the cytosol by photothermal nanoblade injection. Conclusions: T3SS3 does not directly activate NFκB but facilitates bacterial escape into the cytosol where the host is able to sense the presence of the pathogen through cytosolic sensors leading to NFκB activation.

Original languageEnglish (US)
Article number115
JournalBMC microbiology
Volume14
Issue number1
DOIs
StatePublished - May 6 2014
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Microbiology (medical)

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