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Subversion of autophagy in adherent invasive Escherichia coli-infected neutrophils induces inflammation and cell death.


ABSTRACT: Invading bacteria are recognized, captured and killed by a specialized form of autophagy, called xenophagy. Recently, defects in xenophagy in Crohn's disease (CD) have been implicated in the pathogenesis of human chronic inflammatory diseases of uncertain etiology of the gastrointestinal tract. We show here that pathogenic adherent-invasive Escherichia coli (AIEC) isolated from CD patients are able to adhere and invade neutrophils, which represent the first line of defense against bacteria. Of particular interest, AIEC infection of neutrophil-like PLB-985 cells blocked autophagy at the autolysosomal step, which allowed intracellular survival of bacteria and exacerbated interleukin-8 (IL-8) production. Interestingly, this block in autophagy correlated with the induction of autophagic cell death. Likewise, stimulation of autophagy by nutrient starvation or rapamycin treatment reduced intracellular AIEC survival and IL-8 production. Finally, treatment with an inhibitor of autophagy decreased cell death of AIEC-infected neutrophil-like PLB-985 cells. In conclusion, excessive autophagy in AIEC infection triggered cell death of neutrophils.

SUBMITTER: Chargui A 

PROVIDER: S-EPMC3522719 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Subversion of autophagy in adherent invasive Escherichia coli-infected neutrophils induces inflammation and cell death.

Chargui Abderrahman A   Cesaro Annabelle A   Mimouna Sanda S   Fareh Mohamed M   Brest Patrick P   Naquet Philippe P   Darfeuille-Michaud Arlette A   Hébuterne Xavier X   Mograbi Baharia B   Vouret-Craviari Valérie V   Hofman Paul P  

PloS one 20121214 12


Invading bacteria are recognized, captured and killed by a specialized form of autophagy, called xenophagy. Recently, defects in xenophagy in Crohn's disease (CD) have been implicated in the pathogenesis of human chronic inflammatory diseases of uncertain etiology of the gastrointestinal tract. We show here that pathogenic adherent-invasive Escherichia coli (AIEC) isolated from CD patients are able to adhere and invade neutrophils, which represent the first line of defense against bacteria. Of p  ...[more]

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