Yersinia enterocolitica promotes deactivation of macrophage mitogen-activated protein kinases extracellular signal-regulated kinase-1/2, p38, and c-Jun NH2-terminal kinase. Correlation with its inhibitory effect on tumor necrosis factor-alpha production.

The Journal of Biological Chemistry
K RuckdeschelB Rouot

Abstract

The enteropathogenic bacterium Yersinia enterocolitica counteracts host defense mechanisms by interfering with eukaryotic signal transduction pathways. In this study, we investigated the mechanism by which Y. enterocolitica prevents macrophage tumor necrosis factor-alpha (TNFalpha) production. Murine J774A.1 macrophages responded to Y. enterocolitica infection by rapid activation of mitogen-activated protein kinases (MAPK) extracellular signal-regulated kinase (ERK), p38, and c-Jun NH2-terminal kinase (JNK). However, after initial activation, the virulent Y. enterocolitica strain harboring the Y. enterocolitica virulence plasmid caused a substantial decrease in ERK1/2 and p38 tyrosine phosphorylation. Simultaneously, the virulent Y. enterocolitica strain gradually suppressed phosphorylation of the transcription factors Elk-1, activating transcription factor 2 (ATF2), and c-Jun, indicating time-dependent inhibition of ERK1/2, p38, and JNK kinase activities, respectively. Analysis of different Y. enterocolitica mutants revealed that (i) MAPK inactivation parallels the inhibition of TNFalpha release, (ii) the suppressor effect on TNFalpha production, which originates from the lack of TNFalpha mRNA, is distinct from the ability of ...Continue Reading

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