0000000000625181

AUTHOR

Matthias Krüll

showing 3 related works from this author

Rho protein inactivation induced apoptosis of cultured human endothelial cells.

2002

Small GTP-binding Rho GTPases regulate important signaling pathways in endothelial cells, but little is known about their role in endothelial cell apoptosis. Clostridial cytotoxins specifically inactivate GTPases by glucosylation [ Clostridium difficile toxin B-10463 (TcdB-10463), C. difficile toxin B-1470 (TcdB-1470)] or ADP ribosylation ( C. botulinum C3 toxin). Exposure of human umbilical cord vein endothelial cells (HUVEC) to TcdB-10463, which inhibits RhoA/Rac1/Cdc42, or to C3 toxin, which inhibits RhoA, -B, -C, resulted in apoptosis, whereas inactivation of Rac1/Cdc42 with TcdB-1470 was without effect, suggesting that Rho inhibition was responsible for endothelial apoptosis. Disruptio…

Pulmonary and Respiratory Medicinerac1 GTP-Binding Proteinrho GTP-Binding ProteinsProgrammed cell deathUmbilical VeinsEndotheliumPhysiologyBacterial ToxinsCASP8 and FADD-Like Apoptosis Regulating ProteinApoptosisBcl-2-associated X proteinBacterial ProteinsPhysiology (medical)Proto-Oncogene ProteinsmedicineCyclic AMPIn Situ Nick-End LabelingHumanscdc42 GTP-Binding ProteinCells Culturedbcl-2-Associated X ProteinAdenosine Diphosphate RibosebiologyCaspase 3Intracellular Signaling Peptides and ProteinsCell BiologyCaspase 9Cell biologyNeoplasm ProteinsEndothelial stem cellmedicine.anatomical_structureCdc42 GTP-Binding ProteinProto-Oncogene Proteins c-bcl-2Cell cultureApoptosisCaspasesbiology.proteinMyeloid Cell Leukemia Sequence 1 ProteinEndothelium VascularSignal transductionCarrier ProteinsrhoA GTP-Binding ProteinBH3 Interacting Domain Death Agonist ProteinSignal TransductionAmerican journal of physiology. Lung cellular and molecular physiology
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Rho protein inhibition blocks protein kinase C translocation and activation.

1998

Small GTP-binding proteins of the Ras and Rho family participate in various important signalling pathways. Large clostridial cytotoxins inactivate GTPases by UDP-glucosylation. Using Clostridium difficile toxin B-10463 (TcdB) for inactivation of Rho proteins (RhoA/Rac/Cdc42) and Clostridium sordellii lethal toxin-1522 (TcsL) for inactivation of Ras-proteins (Ras/Rac/Ral, Rap) the role of these GTPases in protein kinase C (PKC) stimulation was studied. Phorbol-myristate-acetate (PMA) induced a rapid PKC translocation to and activation in the particulate cell fraction as determined by PKC-activity measurements and Western blots for PKC alpha. These effects were blocked by TcdB inhibiting Rho …

LipopolysaccharidesRHOASwineBiophysicsClostridium difficile toxin ABronchiCell Cycle ProteinsGTPaseCDC42PKC alphaBiochemistryGTP-Binding ProteinsRHO protein GDP dissociation inhibitorAnimalsHumanscdc42 GTP-Binding ProteinMolecular BiologyProtein kinase CCells CulturedProtein Kinase CbiologyEpithelial CellsCell BiologyMolecular biologyCell biologyEnzyme ActivationCdc42 GTP-Binding Proteinbiology.proteinras ProteinsTetradecanoylphorbol AcetateEndothelium VascularrhoA GTP-Binding ProteinBiochemical and biophysical research communications
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Reduction of tumor necrosis factor-alpha (TNF-α) related nuclear factor-kappaB (NF-κB) translocation but not inhibitor kappa-B (Iκ-B)-degradation by …

2002

Degradation of inhibitor kappa-B (Ikappa-B) followed by translocation of nuclear factor-kappaB (NF-kappaB) into the nucleus and activation of gene expression is essential in tumor necrosis factor-alpha (TNF-alpha)-signaling. In order to analyze the role of Rho proteins in TNF-alpha-induced NF-kappaB-activation in human umbilical cord vein endothelial cells (HUVEC) we used Clostridium difficile toxin B-10463 (TcdB-10463) which inactivates RhoA/Rac1/Cdc42 by glucosylation and Clostridium botulinum C3-toxin which inhibits RhoA/B/C by ADP-ribosylation. Exposure of HUVEC to 10 ng/mL TcdB-10463 or 2.5 microg/mL C3-toxin inhibited TNF-alpha (100 ng/mL)-induced expression of a NF-kappaB-dependent r…

PharmacologyTRAF2RHOATumor Necrosis Factor-alphaNF-kappa BClostridium difficile toxin ABiological TransportRAC1Chromosomal translocationDNABiologyBiochemistryMolecular biologyRho kinase inhibitorbiology.proteinHumansI-kappa B ProteinsTumor necrosis factor alphaEndothelium VascularInterleukin 8rhoA GTP-Binding ProteinCells CulturedBiochemical Pharmacology
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