Open AccessActivation of the inflammasome upon Francisella tularensis infection: interplay of innate immune pathways and virulence factors
Author(s) -
Henry Thomas,
Monack Denise M.
Publication year - 2007
Publication title -
cellular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.542
H-Index - 138
eISSN - 1462-5822
pISSN - 1462-5814
DOI - 10.1111/j.1462-5822.2007.01022.x
Subject(s) - francisella tularensis , pyroptosis , biology , inflammasome , innate immune system , francisella , tularemia , microbiology and biotechnology , virulence , caspase 1 , intracellular parasite , immune system , pathogen , immunology , inflammation , genetics , gene
Summary Tularaemia is a zoonotic disease caused by the facultative intracellular bacterium Francisella tularensis . The virulence of this pathogen depends on its ability to escape into the cytosol of host cells. Pathogens are detected by the innate immune system's pattern recognition receptors which are activated in response to conserved microbial molecules (pathogen‐associated molecular patterns). Cytosolic bacteria are sensed intracellularly, often leading to activation of the cysteine protease caspase‐1 within a multimolecular complex called the inflammasome. Caspase‐1 activation leads to both host cell death and release of pro‐inflammatory cytokines in a process called pyroptosis. Here we review the pathway leading to, and the consequences of, inflammasome activation upon F. tularensis infection both in vitro and in vivo . Finally, we discuss recent data on how other innate immune pathways and F. tularensis virulence factors control the activation of the inflammasome during infection.