Journal
INTERNATIONAL IMMUNOLOGY
Volume 26, Issue 4, Pages 209-220Publisher
OXFORD UNIV PRESS
DOI: 10.1093/intimm/dxt067
Keywords
apoptosis inhibitor of macrophages; dioxin receptor; innate immunity; Listeria monocytogenes
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Funding
- Ministry of Education, Culture, Sports, Science and Technology [23790545]
- Mochida Memorial Foundation for Medical and Pharmaceutical research
- Kanae Foundation for the Promotion of Medical Science
- Mitsubishi Pharma Research Foundation
- Institute for Fermentation, Osaka
- Grants-in-Aid for Scientific Research [24117718, 23790545, 26713019, 25860324] Funding Source: KAKEN
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The AhR protects against Listeria infection by enhancing macrophage survival and ROS production.Aryl hydrocarbon receptor (AhR) is crucial for various immune responses. The relationship between AhR and infection with the intracellular bacteria Listeria monocytogenes (LM) is poorly understood. Here, we show that in response to LM infection, AhR is required for bacterial clearance by promoting macrophage survival and reactive oxygen species (ROS) production. AhR-deficient mice were more susceptible to listeriosis, and AhR deficiency enhances bacterial growth in vivo and in vitro. On the other hand, pro-inflammatory cytokines were increased in AhR-deficient macrophages infected with LM despite enhanced susceptibility to LM infection in AhR-deficient mice. Subsequent studies demonstrate that AhR protects against macrophage cell death induced by LM infection through the induction of the antiapoptotic factor, the apoptosis inhibitor of macrophages, which promotes macrophage survival in the setting of LM infection. Furthermore, AhR promotes ROS production for bacterial clearance. Our results demonstrate that AhR is essential to the resistance against LM infection as it promotes macrophage survival and ROS production. This suggests that the activation of AhR by its ligands may be an effective strategy against listeriosis.
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