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2017 ; 13
(6
): e1006383
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Detection of a microbial metabolite by STING regulates inflammasome activation in
response to Chlamydia trachomatis infection
#MMPMID28570638
Webster SJ
; Brode S
; Ellis L
; Fitzmaurice TJ
; Elder MJ
; Gekara NO
; Tourlomousis P
; Bryant C
; Clare S
; Chee R
; Gaston HJS
; Goodall JC
PLoS Pathog
2017[Jun]; 13
(6
): e1006383
PMID28570638
show ga
The innate immune system is a critical component of host defence against
microbial pathogens, but effective responses require an ability to distinguish
between infectious and non-infectious insult to prevent inappropriate
inflammation. Using the important obligate intracellular human pathogen Chlamydia
trachomatis; an organism that causes significant immunopathology, we sought to
determine critical host and pathogen factors that contribute to the induction of
inflammasome activation. We assayed inflammasome activation by immunoblotting and
ELISA to detect IL-1? processing and LDH release to determine pyroptosis. Using
primary murine bone marrow derived macrophages or human monocyte derived
dendritic cells, infected with live or attenuated Chlamydia trachomatis we report
that the live organism activates both canonical and non-canonical inflammasomes,
but only canonical inflammasomes controlled IL-1? processing which preceded
pyroptosis. NADPH oxidase deficient macrophages were permissive to Chlamydia
trachomatis replication and displayed elevated type-1 interferon and inflammasome
activation. Conversely, attenuated, non-replicating Chlamydia trachomatis, primed
but did not activate inflammasomes and stimulated reduced type-1 interferon
responses. This suggested bacterial replication or metabolism as important
factors that determine interferon responses and inflammasome activation. We
identified STING but not cGAS as a central mediator of interferon regulated
inflammasome activation. Interestingly, exogenous delivery of a Chlamydia
trachomatis metabolite and STING ligand-cyclic di-AMP, recovered inflammasome
activation to attenuated bacteria in a STING dependent manner thus indicating
that a bacterial metabolite is a key factor initiating inflammasome activation
through STING, independent of cGAS. These data suggest a potential mechanism of
how the innate immune system can distinguish between infectious and
non-infectious insult and instigate appropriate immune responses that could be
therapeutically targeted.