0000000000373153

AUTHOR

Erwin Bohn

showing 3 related works from this author

Activation of NF-kappaB and IL-8 by yersinia enterocolitica invasin protein is conferred by engagement of rac1 and MAP kinase cascades.

2003

International audience; Yersinia enterocolitica triggers activation of the nuclear factor (NF)-kappaB and production of the proinflammatory chemokine interleukin (IL)-8 in intestinal epithelial cells. This activation is due to adhesion of the bacteria via their outer membrane protein invasin to the host cells. Using Clostridium difficile toxins that specifically inactivate small GTPases, and transfection of inhibitory proteins of the Rho-GTPases, we demonstrate that Rac1, but not Cdc42 or Rho, is required for activation of NF-kappaB by invasin. Invasin activated the mitogen activated protein kinases (MAPK) p38 and c-Jun N-terminal protein kinase (JNK) but not extracellular signal regulated …

rac1 GTP-Binding ProteinMAP Kinase Kinase 4MAP Kinase Signaling SystemRNA Stability[SDV]Life Sciences [q-bio]ImmunologyMitogen-activated protein kinase kinasep38 Mitogen-Activated Protein KinasesMicrobiologyBacterial AdhesionMAP2K703 medical and health sciencesBacterial ProteinsVirologyHumansASK1RNA Messengerc-RafAdhesins Bacterialcdc42 GTP-Binding ProteinrhoB GTP-Binding ProteinYersinia enterocolitica030304 developmental biologyMitogen-Activated Protein Kinase Kinases0303 health sciencesbiologyMAP kinase kinase kinase030306 microbiologyInterleukin-8Cyclin-dependent kinase 2JNK Mitogen-Activated Protein KinasesNF-kappa BProtein kinase RMolecular biologyCell biologybiology.proteinCyclin-dependent kinase 9Mitogen-Activated Protein KinasesrhoA GTP-Binding ProteinHeLa CellsSignal Transduction
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Ambiguous Role of Interleukin-12 in Yersinia enterocolitica Infection in Susceptible and Resistant Mouse Strains

1998

ABSTRACT Endogenous interleukin-12 (IL-12) mediates protection against Yersinia enterocolitica in C57BL/6 mice by triggering gamma interferon (IFN-γ) production in NK and CD4 + T cells. Administration of exogenous IL-12 confers protection against yersiniae in Yersinia -susceptible BALB/c mice but exacerbates yersiniosis in resistant C57BL/6 mice. Therefore, we wanted to dissect the different mechanisms exerted by IL-12 during Yersinia infections by using different models of Yersinia -resistant and -susceptible mice, including resistant C57BL/6 mice, susceptible BALB/c mice, intermediate-susceptible wild-type 129/Sv mice, 129/Sv IFN-γ-receptor-deficient (IFN-γR −/− ) mice and C57BL/6 tumor n…

Yersinia Infectionsmedicine.medical_treatmentImmunologyCD8-Positive T-LymphocytesYersiniaMicrobiologyMicrobiologyProinflammatory cytokineInterferon-gammaMiceTransforming Growth Factor betamedicineAnimalsInterferon gammaYersinia enterocoliticaReceptors InterferonYersinia enterocoliticaMice KnockoutHost Response and InflammationMice Inbred BALB CbiologyTumor Necrosis Factor-alphaYersiniosisbiology.organism_classificationmedicine.diseaseInterleukin-12Killer Cells NaturalMice Inbred C57BLInfectious DiseasesCytokineImmunologyInterleukin 12FemaleParasitologyTumor necrosis factor alphamedicine.drugInfection and Immunity
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Bacteroides vulgatus protects against escherichia coli-induced colitis in gnotobiotic interleukin-2-deficient mice

2003

Abstract Background & Aims: The microflora plays a crucial role in inflammatory bowel diseases (IBDs). Specific pathogen-free (SPF), but not germ-free, interleukin (IL)-2-deficient (IL-2−/−) mice develop colitis. The colitogenicity of commensal bacteria was determined. Methods: Gnotobiotic IL-2−/− and IL-2+/+ mice were colonized with Escherichia coli mpk, Bacteroides vulgatus mpk, or both bacterial strains, or with E. coli strain Nissle 1917. DNA arrays were used to characterize E. coli mpk. Colitis was analyzed by histology and real-time reverse-transcription polymerase chain reaction (RT-PCR) for interferon (IFN)-γ, tumor necrosis factor (TNF)-α, IL-10, and CD14 messenger RNA (mRNA) expre…

MaleGene Expressionmedicine.disease_causeMicrobiologyFecesMiceInterferonEscherichia colimedicineAnimalsBacteroidesGerm-Free LifeColitisEscherichia coliBacteroidaceaeEscherichia coli InfectionsSpecific-pathogen-freeHepatologybiologyGastroenterologyInterleukinColitismedicine.diseasebiology.organism_classificationEnterobacteriaceaeMice Mutant StrainsSpecific Pathogen-Free OrganismsIntestinesMice Inbred C57BLInterleukin-2FemaleTumor necrosis factor alphamedicine.drugGastroenterology
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