NF-κB Activation during AcuteHelicobacter pyloriInfection in Mice
- 1 February 2008
- journal article
- Published by American Society for Microbiology in Infection and Immunity
- Vol. 76 (2), 551-561
- https://doi.org/10.1128/iai.01107-07
Abstract
Nuclear factor κB (NF-κB) plays a key regulatory role in host cell responses toHelicobacter pyloriinfection in humans. Although mice are routinely used as a model to studyH. pyloripathogenesis, the role of NF-κB in murine cell responses to helicobacters has not been studied in detail. We thus investigated the abilities of differentHelicobacterisolates to induce NF-κB-dependent responses in murine gastric epithelial cells (GECs) and in transgenic mice harboring an NF-κB-responsivelacZreporter gene.H. pyloriandHelicobacter felisstrains up-regulated the synthesis in mouse GECs of the NF-κB-dependent chemokines KC (CXCL1) and MIP-2 (CXCL2). These responses werecagpathogenicity island (cagPAI) independent and could be abolished by pretreatment with a pharmacological inhibitor of NF-κB. Consistent with the in vitro data, experimentalHelicobacterinfection of transgenic mice resulted in increased numbers of GECs with nuclear β-galactosidase activity, which is indicative of specific NF-κB activation. The numbers of β-galactosidase-positive cells in mice were significantly increased at day 1 postinoculation with wild-typeH. pyloristrains harboring or not harboring a functionalcagPAI, compared to naive animals (P= 0.007 andP= 0.04, respectively). Strikingly, however, no differences were observed in the levels of gastric NF-κB activation at day 1 postinoculation withH. felisor at day 30 or 135 postinoculation withH. pylori. This work demonstrates for the first time the induction of NF-κB activation within gastric mucosal cells during acuteH. pyloriinfection. Furthermore, the data suggest that helicobacters may be able to regulate NF-κB signaling during chronic infection.Keywords
This publication has 49 references indexed in Scilit:
- Inhibitory Effect of Enterohepatic Helicobacter hepaticus on Innate Immune Responses of Mouse Intestinal Epithelial CellsInfection and Immunity, 2007
- CagA protein secreted by the intact type IV secretion system leads to gastric epithelial inflammation in the Mongolian gerbil modelThe Journal of Pathology, 2006
- Helicobacter pyloriInduces IκB Kinase α Nuclear Translocation and Chemokine Production in Gastric Epithelial CellsInfection and Immunity, 2006
- Roles of virD4 and cagG genes in the cag pathogenicity island of Helicobacter pylori using a Mongolian gerbil modelGut, 2005
- Helicobacter pylori-dependent NF-kappa B activation in newly established Mongolian gerbil gastric cancer cell linesCancer Science, 2005
- Transcription profiling analysis of the mechanisms of vaccine‐induced protection against H. pyloriThe FASEB Journal, 2004
- A Novel In Vitro Infection Model of Helicobacter pylori Using Mucin-Producing Murine Gastric Surface Mucous CellsHelicobacter, 2004
- Role of Gamma Interferon inHelicobacter pyloriInduction of Inflammatory Mediators during Murine InfectionInfection and Immunity, 2002
- CXC Chemokine Redundancy Ensures Local Neutrophil Recruitment during Acute InflammationThe American Journal of Pathology, 2001
- Activation of Intercellular Adhesion Molecule 1 Expression byHelicobacter pyloriIs Regulated by NF-κB in Gastric Epithelial Cancer CellsInfection and Immunity, 2000