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Yersinia enterocolitica inactivates NK cells
Isabel Koch1, Kristina Dach, Jürgen Heesemann
1Ludwig Maximilians University, Max von Pettenkofer Institut, Department of Bacteriology, 80336 Munich, Germany.
International Journal of Medical Microbiology : IJMM
|July 2, 2013
Summary
Yersinia enterocolitica inactivates Natural Killer (NK) cells by adhering to them and inhibiting their function. This bacterial pathogen disrupts NK cell signaling pathways, impacting early immune responses during infection.
Area of Science:
- Immunology
- Microbiology
- Cell Biology
Background:
- Natural Killer (NK) cells are crucial for early immune responses, producing proinflammatory cytokines during infection.
- Bacterial pathogens can evade or manipulate host immune cells to establish infection.
Purpose of the Study:
- To investigate the interaction between Yersinia enterocolitica and NK cells.
- To determine if Y. enterocolitica can inactivate NK cell functions, such as cytotoxicity and cytokine production.
Main Methods:
- In vitro experiments examining NK cell adherence to Y. enterocolitica.
- Analysis of NK cell cytotoxicity and Interferon-gamma (IFN-γ) production upon stimulation with cytokines (IL-12, IL-18).
- Investigation of the role of Yersinia outer proteins (Yops), specifically YopP, in modulating NK cell signaling pathways (MAPK, NFκB, Tyk2, STAT4).
- In vivo studies to confirm NK cell-Y. enterocolitica interactions during infection.
Main Results:
- Y. enterocolitica adheres to NK cells in an Invasin-dependent manner.
- The bacterium inhibits NK cell cytotoxicity and IFN-γ production induced by IL-12 and/or IL-18.
- YopP suppresses IFN-γ production by inhibiting phosphorylation of Tyk2 and STAT4, as well as MAPK signaling.
- YopP broadly inhibits gene induction by IL-12+IL-18 in NK cells.
- NK cell inactivation by Y. enterocolitica was observed both in vitro and in vivo.
Conclusions:
- Yersinia enterocolitica actively inactivates Natural Killer cells, representing a novel mechanism of immune evasion by a bacterial pathogen.
- The bacterial effector YopP plays a key role in this inactivation by targeting crucial signaling pathways, including the Tyk2-STAT4 pathway.
- This study reveals a new function for YopP in disrupting host innate immunity via NK cell modulation.
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