The Journal of Experimental Medicine
Cytokines Montreal 2008
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J. Exp. Med., Volume 187, Number 7, April 6, 1998 1069-1079

Yersinia enterocolitica Impairs Activation of Transcription Factor NF-kappa B: Involvement in the Induction of Programmed Cell Death and in the Suppression of the Macrophage Tumor Necrosis Factor alpha  Production

By Klaus Ruckdeschel,* Suzanne Harb,* Andreas Roggenkamp,Dagger Mathias Hornef,Dagger Robert Zumbihl,Dagger Stephan Köhler,* Jürgen Heesemann,Dagger and Bruno Rouot*

From the * Institut National de la Santé et de la Recherche Médicale U431, Université Montpellier II, 34095 Montpellier Cedex 05, France; and the Dagger  Max von Pettenkofer-Institut für Hygiene und Medizinische Mikrobiologie, 80336 München, Germany

In this study, we investigated the activity of transcription factor NF-kappa B in macrophages infected with Yersinia enterocolitica. Although triggering initially a weak NF-kappa B signal, Y. enterocolitica inhibited NF-kappa B activation in murine J774A.1 and peritoneal macrophages within 60 to 90 min. Simultaneously, Y. enterocolitica prevented prolonged degradation of the inhibitory proteins Ikappa B-alpha and Ikappa B-beta observed by treatment with lipopolysaccharide (LPS) or nonvirulent, plasmid-cured yersiniae. Analysis of different Y. enterocolitica mutants revealed a striking correlation between the abilities of these strains to inhibit NF-kappa B and to suppress the tumor necrosis factor alpha  (TNF-alpha ) production as well as to trigger macrophage apoptosis. When NF-kappa B activation was prevented by the proteasome inhibitor MG-132, nonvirulent yersiniae as well as LPS became able to trigger J774A.1 cell apoptosis and inhibition of the TNF-alpha secretion. Y. enterocolitica also impaired the activity of NF-kappa B in epithelial HeLa cells. Although neither Y. enterocolitica nor TNF-alpha could induce HeLa cell apoptosis alone, TNF-alpha provoked apoptosis when activation of NF-kappa B was inhibited by Yersinia infection or by the proteasome inhibitor MG-132. Together, these data demonstrate that Y. enterocolitica suppresses cellular activation of NF-kappa B, which inhibits TNF-alpha release and triggers apoptosis in macrophages. Our results also suggest that Yersinia infection confers susceptibility to programmed cell death to other cell types, provided that the appropriate death signal is delivered.


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