Burkholderia cenocepacia disrupts host cell actin cytoskeleton by inactivating Rac and Cdc42

Ronald S. Flannagan, Valentin Jaumouille, Kassidy K. Huynh, Jonathan D. Plumb, Gregory P. Downey, Miguel A. Valvano, Sergio Grinstein

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Burkholderia cenocepacia, a member of the Burkholderia cepacia complex, is an opportunistic pathogen that causes devastating infections in patients with cystic fibrosis. The ability of B. cenocepacia to survive within host cells could contribute significantly to its virulence in immunocompromised patients. In this study, we explored the mechanisms that enable B. cenocepacia to survive inside macrophages. We found that B. cenocepacia disrupts the actin cytoskeleton of infected macrophages, drastically altering their morphology. Submembranous actin undergoes depolymerization, leading to cell retraction. The bacteria perturb actin architecture by inactivating Rho family GTPases, particularly Rac1 and Cdc42. GTPase inactivation follows internalization of viable B. cenocepacia and compromises phagocyte function: macropinocytosis and phagocytosis are markedly inhibited, likely impairing the microbicidal and antigen-presenting capability of infected macrophages. The type VI secretion system is essential for the bacteria to elicit these changes. This is the first report demonstrating inactivation of Rho family GTPases by a member of the B. cepacia complex.
Original languageEnglish
Pages (from-to)239-254
Number of pages16
JournalCellular Microbiology
Issue number2
Early online date25 Oct 2011
Publication statusPublished - Feb 2012
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Virology


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