Interaction ofYersinia pestiswith Macrophages: Limitations in YopJ-Dependent Apoptosis
- 1 June 2006
- journal article
- research article
- Published by American Society for Microbiology in Infection and Immunity
- Vol. 74 (6), 3239-3250
- https://doi.org/10.1128/iai.00097-06
Abstract
The enteropathogenicYersiniastrains are known to downregulate signaling pathways in macrophages by effectors of the type III secretion system, in which YopJ/YopP plays a crucial role. The adverse effects ofYersinia pestis, the causative agent of plague, were examined by infecting J774A.1 cells, RAW264.7 cells, and primary murine macrophages with the EV76 strain and with the fully virulent Kimberley53 strain.Y. pestisexerts YopJ-dependent suppression of tumor necrosis factor alpha secretion and phosphorylation of mitogen-activated protein kinases and thus resembles enteropathogenicYersinia. However,Y. pestisis less able to activate caspases, to suppress NF-κB activation, and to induce apoptosis in macrophages than the high-virulenceY. enterocoliticaWA O:8 strain. These differences appear to be related to lower efficiency of YopJ effector translocation byY. pestis. The efficiencies of effector translocation and of apoptosis induction can be enhanced either by using a high bacterial load in a synchronized infection or by overexpressing exogenous YopJ inY. pestis. Replacing YopJ with the homologousY. enterocoliticaeffector YopP can further enhance these effects. Overexpression of YopP in ayopJ-deletedY. pestisbackground leads to rapid and effective translocation into target cells, providingY. pestiswith the high cytotoxic potential ofY. enterocoliticaWA O:8. We suggest that the relative inferiority ofY. pestisin triggering cell death in macrophages may be advantageous for its in vivo propagation in the early stages of infection.Keywords
This publication has 56 references indexed in Scilit:
- Yersinia virulence factor YopJ acts as a deubiquitinase to inhibit NF-κB activationThe Journal of Experimental Medicine, 2005
- Generation ofYersinia pestisAttenuated Strains by Signature-Tagged Mutagenesis in Search of Novel Vaccine CandidatesInfection and Immunity, 2004
- Development of an Improved Selective Agar Medium for Isolation of Yersinia pestisApplied and Environmental Microbiology, 2003
- Yersinia pestis and plagueBiochemical Society Transactions, 2003
- Role of Yops and Adhesins in Resistance ofYersinia enterocoliticato PhagocytosisInfection and Immunity, 2002
- Genome sequence of Yersinia pestis, the causative agent of plagueNature, 2001
- Smad Proteins Suppress CCAAT/Enhancer-binding Protein (C/EBP) β- and STAT3-mediated Transcriptional Activation of the Haptoglobin PromoterJournal of Biological Chemistry, 2001
- YopJ of Yersinia pseudotuberculosis is required for the inhibition of macrophage TNF‐α production and downregulation of the MAP kinases p38 and JNKMolecular Microbiology, 1998
- The Yersinia Yop virulon: a bacterial system for subverting eukaryotic cellsMolecular Microbiology, 1997
- Sylvatic plague studies. The vector efficiency of nine species of fleas compared with Xenopsylla cheopisEpidemiology and Infection, 1947