2013
Effect of NSAIDs on Na+/H+ exchanger activity in rat colonic crypts
Roginiel AC, Kohut DL, Kaur S, Saleh AM, Weber T, Geibel P, Singh H, Geibel JP. Effect of NSAIDs on Na+/H+ exchanger activity in rat colonic crypts. American Journal Of Physiology - Cell Physiology 2013, 305: c512-c518. PMID: 23739181, DOI: 10.1152/ajpcell.00303.2012.Peer-Reviewed Original ResearchConceptsRat colonic cryptsExchanger activityNonsteroidal anti-inflammatory drugsUpper GI injuryColonic cryptsLower GI bleedingUse of NSAIDsChronic inflammatory stateLower GI tractUse of suppositoriesEffects of NSAIDsAnti-inflammatory drugsGI injuryNSAIDs aspirinGI bleedingPain reliefRheumatoid diseaseEpithelial erosionsInflammatory stateMyocardial infarctionChronic conditionsMucosal barrierUlcer formationColonic tissueGastrointestinal tractThe calcium sensing receptor modulates fluid reabsorption and acid secretion in the proximal tubule
Capasso G, Geibel PJ, Damiano S, Jaeger P, Richards WG, Geibel JP. The calcium sensing receptor modulates fluid reabsorption and acid secretion in the proximal tubule. Kidney International 2013, 84: 277-284. PMID: 23615500, DOI: 10.1038/ki.2013.137.Peer-Reviewed Original ResearchMeSH KeywordsAcid-Base EquilibriumAnimalsCalcimimetic AgentsCalciumHydrogen-Ion ConcentrationIn Vitro TechniquesKidney Tubules, ProximalMaleMiceMice, KnockoutNuclear ProteinsPerfusionPuncturesRatsRats, Sprague-DawleyReceptors, Calcium-SensingReceptors, G-Protein-CoupledSodium-Hydrogen ExchangersTranscription FactorsConceptsProximal tubulesLuminal calcium concentrationFluid reabsorptionAcid secretionKnockout miceCalcium ion concentrationCalcium concentrationRole of CaSRActivation of CaSRCalcium sensing receptorCalcium-sensing receptorMouse proximal tubulesProton secretionSodium-hydrogen exchangerCalcimimetic agentBicarbonate absorptionSensing receptorCaSRFluid absorptionSecretionReabsorptionMiceCalcimimeticsTubulesLuminal membrane
2011
Functional role of NHE4 as a pH regulator in rat and human colonic crypts
Arena EA, Longo WE, Roberts KE, Geibel P, Nateqi J, Brandstetter M, Geibel JP. Functional role of NHE4 as a pH regulator in rat and human colonic crypts. American Journal Of Physiology - Cell Physiology 2011, 302: c412-c418. PMID: 22049213, DOI: 10.1152/ajpcell.00163.2011.Peer-Reviewed Original ResearchConceptsHuman colonic cryptsNHE4 activityColonic cryptsElective colon resectionEffects of aldosteroneSprague-Dawley ratsColon resectionRat modelGastrointestinal tractAldosteroneColonic samplesΜM forskolinFluid homeostasisRatsHuman colonHuman specimensCAMP levelsIntracellular pathwaysCryptsNHE4ColonSignificant changesLittle descriptionFunctional roleRecent studies
2008
Mouse model of type II Bartter's syndrome. II. Altered expression of renal sodium- and water-transporting proteins
Wagner CA, Loffing-Cueni D, Yan Q, Schulz N, Fakitsas P, Carrel M, Wang T, Verrey F, Geibel JP, Giebisch G, Hebert SC, Loffing J. Mouse model of type II Bartter's syndrome. II. Altered expression of renal sodium- and water-transporting proteins. American Journal Of Physiology. Renal Physiology 2008, 294: f1373-f1380. PMID: 18322017, DOI: 10.1152/ajprenal.00613.2007.Peer-Reviewed Original ResearchMeSH KeywordsAdaptation, PhysiologicalAnimalsBartter SyndromeCarrier ProteinsCation Transport ProteinsDinoprostoneDisease Models, AnimalEpithelial Sodium ChannelsKidney Tubules, DistalKidney Tubules, ProximalLoop of HenleMiceMice, Mutant StrainsPotassium Channels, Inwardly RectifyingReverse Transcriptase Polymerase Chain ReactionSodiumSodium-Hydrogen Exchanger 3Sodium-Hydrogen ExchangersSodium-Phosphate Cotransporter Proteins, Type IIaSodium-Potassium-Chloride SymportersSolute Carrier Family 12, Member 1Up-RegulationWaterConceptsThick ascending limbBartter's syndromeBartter-like phenotypeType II Bartter's syndromeWild-type miceAntenatal Bartter syndromeWild-type littermatesROMK null micePlasma aldosteroneMaternal polyhydramniosRenal sodiumVolume depletionRenal tubulopathyMouse modelSemiquantitative immunoblottingProximal tubulesAscending limbKidney homogenatesSyndromeHenle's loopNull miceDCT cellsWater transport proteinsCompensatory mechanismsMice
2004
Inhibition of NHE-1 Na+/H+ exchanger by natriuretic peptides in ocular nonpigmented ciliary epithelium
Fidzinski P, Salvador-Silva M, Choritz L, Geibel J, Coca-Prados M. Inhibition of NHE-1 Na+/H+ exchanger by natriuretic peptides in ocular nonpigmented ciliary epithelium. American Journal Of Physiology - Cell Physiology 2004, 287: c655-c663. PMID: 15140751, DOI: 10.1152/ajpcell.00552.2003.Peer-Reviewed Original ResearchConceptsC-type natriuretic peptideAtrial natriuretic peptideBrain natriuretic peptideNatriuretic peptideIntraocular pressureCiliary epitheliumNHE activityNatriuretic peptides atrial natriuretic peptideInhibitory effectType B receptorsNHE-1 activityNonpigmented ciliary epitheliumCell layerGap junction blockersDose-dependent mannerInhibitors of NHEOcular ciliary epitheliumRate of intracellularHypotensive effectJunction blockersTrabecular meshworkMammalian eyeExchanger activityB receptorNHE-1
2003
Intracellular pH Activates Membrane-Bound Na+/H+ Exchanger and Vacuolar H+-ATPase in Human Embryonic Kidney (HEK) Cells
Lang K, Wagner C, Haddad G, Burnekova O, Geibel J. Intracellular pH Activates Membrane-Bound Na+/H+ Exchanger and Vacuolar H+-ATPase in Human Embryonic Kidney (HEK) Cells. Cellular Physiology And Biochemistry 2003, 13: 257-262. PMID: 14586169, DOI: 10.1159/000074540.Peer-Reviewed Original ResearchConceptsMicroM EIPAIntracellular acidificationFree bath solutionProximal tubule cellsInfluence of intracellularWestern blot analysisTime-dependent mannerTubule cellsHuman embryonic kidney cellsHEK-293 cellsExtruding mechanismHuman embryonic kidney cell line HEK-293NHE3 proteinEmbryonic kidney cellsCell line HEK-293Cytosolic pHKidney cellsBlot analysisAbsence of bicarbonateHEK293 cellsBath solutionEIPAPresent studyActivationCellsDemonstration of a functional apical sodium hydrogen exchanger in isolated rat gastric glands
Kirchhoff P, Wagner CA, Gaetzschmann F, Radebold K, Geibel JP. Demonstration of a functional apical sodium hydrogen exchanger in isolated rat gastric glands. AJP Gastrointestinal And Liver Physiology 2003, 285: g1242-g1248. PMID: 12907430, DOI: 10.1152/ajpgi.00165.2003.Peer-Reviewed Original ResearchAmilorideAnimalsBlotting, WesternCell MembraneEnzyme InhibitorsGastric MucosaGuanidinesH(+)-K(+)-Exchanging ATPaseHistamineHydrogen-Ion ConcentrationImmunohistochemistryIn Vitro TechniquesIntracellular MembranesIsoenzymesMethacrylatesOmeprazoleParietal Cells, GastricPerfusionRatsRats, Sprague-DawleySodium-Hydrogen Exchanger 3Sodium-Hydrogen Exchangers
2001
Cloning and Expression of a Chloride-dependent Na+-H+ Exchanger*
Sangan P, Rajendran VM, Geibel JP, Binder HJ. Cloning and Expression of a Chloride-dependent Na+-H+ Exchanger*. Journal Of Biological Chemistry 2001, 277: 9668-9675. PMID: 11773056, DOI: 10.1074/jbc.m110852200.Peer-Reviewed Original ResearchMeSH KeywordsAmilorideAmino Acid SequenceAnimalsBlotting, NorthernCell LineChlorineCloning, MolecularColonDiureticsDNA, ComplementaryFibroblastsHydrogen-Ion ConcentrationIn Situ HybridizationMaleMolecular Sequence DataPhosphorylationProtein Structure, TertiaryRatsRats, Sprague-DawleyRNA, MessengerSequence Homology, Amino AcidSodiumSodium-Hydrogen Exchanger 1Sodium-Hydrogen ExchangersTime FactorsTissue DistributionConceptsRat distal colonDistal colonAmino acidsCrypt cellsExchange isoformsDietary sodium depletionColonic crypt cellsFull-length cDNACl- channel blockerColonic epithelial cellsN-terminal regionNorthern blot analysisSodium depletionChannel blockersNovel C-terminusPutative transmembranePS120 fibroblastsAcid loadDependent intracellularC-terminusNHE-1Epithelial cellsIsoform inhibitorAmiloride analoguesMultiple tissuesCharacterization of apical membrane Cl-dependent Na/H exchange in crypt cells of rat distal colon
Rajendran V, Geibel J, Binder H. Characterization of apical membrane Cl-dependent Na/H exchange in crypt cells of rat distal colon. AJP Gastrointestinal And Liver Physiology 2001, 280: g400-g405. PMID: 11171622, DOI: 10.1152/ajpgi.2001.280.3.g400.Peer-Reviewed Original ResearchConceptsRat distal colonNa/H exchangeCl- channel blockerDistal colonChannel blockersCrypt cellsIntracellular pH recoveryExchange inhibitor amilorideColonic epithelial cellsApical membrane vesiclesCrypt glandsHigh doseHOE 694NA depletionAcid loadExchange inhibitorInhibitor amiloridePH recoveryEpithelial cellsUptake 1NHE isoformsAnion exchange inhibitorBlockersColonNa uptakeNa+-dependent fluid absorption in intact perfused rat colonic crypts
Geibel J, Rajendran V, Binder H. Na+-dependent fluid absorption in intact perfused rat colonic crypts. Gastroenterology 2001, 120: 144-150. PMID: 11208723, DOI: 10.1053/gast.2001.20890.Peer-Reviewed Original ResearchMeSH Keywords4,4'-Diisothiocyanostilbene-2,2'-Disulfonic AcidAnimalsBicarbonatesChloridesColonGanglionic StimulantsGlutamatesIn Vitro TechniquesIntestinal AbsorptionInulinIsotonic SolutionsMalePerfusionQuaternary Ammonium CompoundsRatsRats, Sprague-DawleyRinger's SolutionSodiumSodium-Hydrogen ExchangersTritiumConceptsNet fluid absorptionRat colonic cryptsCl- channel blockerFluid absorptionNeurohumoral stimulationChannel blockersColonic cryptsLumen ClAbsorptive processesInhibitor of NaCl(-) secretionAbstractTextCrypt cellsExchange inhibitorMicroperfusion techniqueFluid secretionL DIDSAmiloride analoguesMammalian colonSecretionAnion exchange inhibitorCryptsSignificant increaseAIMSSecretory process
2000
Cl‐Dependent Na‐H Exchange: A Novel Colonic Crypt Transport Mechanism
BINDER H, RAJENDRAN V, GEIBEL J. Cl‐Dependent Na‐H Exchange: A Novel Colonic Crypt Transport Mechanism. Annals Of The New York Academy Of Sciences 2000, 915: 43-53. PMID: 11193600, DOI: 10.1111/j.1749-6632.2000.tb05222.x.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBiological TransportChloride ChannelsColonIntestinal MucosaSodium-Hydrogen Exchangers
1999
Rapid Effects of Aldosterone on Sodium-Hydrogen Exchange in Isolated Colonic Crypts
Winter D, Schneider M, O'Sullivan G, Harvey B, Geibel J. Rapid Effects of Aldosterone on Sodium-Hydrogen Exchange in Isolated Colonic Crypts. The Journal Of Membrane Biology 1999, 170: 17-26. PMID: 10398757, DOI: 10.1007/s002329900534.Peer-Reviewed Original ResearchMeSH KeywordsAldosteroneAmilorideAnimalsArachidonic AcidBicarbonatesColonDiureticsExtracellular SpaceFluoresceinsFluorescent DyesHydrogen-Ion ConcentrationIon ExchangeIon TransportLeukotriene AntagonistsMaleMineralocorticoid Receptor AntagonistsPhospholipasesProstaglandin AntagonistsProtein BiosynthesisProtein Kinase InhibitorsProtein KinasesProtein Synthesis InhibitorsRatsRats, Sprague-DawleySodiumSodium-Hydrogen ExchangersSpironolactoneTranscription, GeneticConceptsProtein synthesisRapid cellular responsesSignal transduction pathwaysProtein kinase CSodium-hydrogen exchangeTransduction pathwaysColonic cryptsGenomic eventsCellular responsesKinase CG proteinsIsolated colonic cryptsConfocal laser imagingIntracellular receptorsTransepithelial electrolyte transportEpithelial ion transportNonepithelial tissuesHomeostatic regulationAldosterone applicationTraditional receptorsCentral roleIntracellular alkalizationIon transportReal-time imagingSteroid actionDirect Effects of Dopamine on Colonic Mucosal pH: Implications for Tonometry
Winter D, O'Sullivan G, Harvey B, Geibel J. Direct Effects of Dopamine on Colonic Mucosal pH: Implications for Tonometry. Journal Of Surgical Research 1999, 83: 62-68. PMID: 10210644, DOI: 10.1006/jsre.1998.5561.Peer-Reviewed Original ResearchConceptsSodium-hydrogen exchangeSplanchnic perfusionIntestinal mucosaLow-dose dopamine infusionBeta-adrenergic receptor blockadeEffects of dopamineSprague-Dawley ratsIntracellular calcium concentrationHepes-buffered Ringer's solutionMucosal crypt cellsFree cytosolic calciumCalcium-sensitive probeSplanchnic vasodilatorTonometric dataDopamine infusionMucosal effectsReceptor blockadeShocked patientsProtein kinase C inhibitionDistal colonGastric mucosaMucosal pHPharmacological agentsDirect effectTonometric measurementsRole of Cl channels in Cl-dependent Na/H exchange
Rajendran V, Geibel J, Binder H. Role of Cl channels in Cl-dependent Na/H exchange. American Journal Of Physiology 1999, 276: g73-g78. PMID: 9886981, DOI: 10.1152/ajpgi.1999.276.1.g73.Peer-Reviewed Original ResearchConceptsNa/H exchangeCl- channel blockerChannel blockersMicroM DIDSNa/H exchange activityCystic fibrosis transmembrane conductance regulatorIntracellular pH recoveryRat distal colonCl- channelsH exchange activityDistal colonCrypt lumenCrypt cellsAcid loadExchange inhibitorApical membranePH recoveryCl(-) dependenceAnion exchange inhibitorCl- channel activityChannel activityBlockersH exchangePolyclonal antibodiesCl- conductance
1997
Novel Transport Properties of Colonic Crypt Cells: Fluid Absorption and Cl-Dependent Na-H Exchange
Binder H, Singh S, Geibel J, Rajendran V. Novel Transport Properties of Colonic Crypt Cells: Fluid Absorption and Cl-Dependent Na-H Exchange. Comparative Biochemistry And Physiology Part A Molecular & Integrative Physiology 1997, 118: 265-269. PMID: 9366054, DOI: 10.1016/s0300-9629(97)00079-0.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBody FluidsChloride ChannelsColonIntestinal AbsorptionIon TransportMicroscopy, FluorescenceRatsSodium-Hydrogen ExchangersVideo RecordingConceptsNa-H exchangeCrypt cellsFluid absorptionLamina propria cellsColonic ion transportNet fluid secretionRat distal colonColonic crypt cellsPresence of myofibroblastsApical membrane vesiclesSecretory processRinger-like solutionDibutyryl cyclic AMPDistal colonCrypt preparationNeurohumoral agonistsAcid loadMorphologic techniquesFluid secretionGradient stimulationAbsorptive processesCyclic AMPIndividual cryptsMyofibroblastsBath solutionDifferential activities of H+extrusion systems in MDCK cells due to extracellular osmolality and pH
Feifel E, Krall M, Geibel J, Pfaller W. Differential activities of H+extrusion systems in MDCK cells due to extracellular osmolality and pH. American Journal Of Physiology 1997, 273: f499-f506. PMID: 9362327, DOI: 10.1152/ajprenal.1997.273.4.f499.Peer-Reviewed Original ResearchMeSH KeywordsAdaptation, PhysiologicalAnimalsBuffersCell LineDogsExtracellular SpaceHydrogenHydrogen-Ion ConcentrationKidneyOsmolar ConcentrationPotassiumProtonsSodiumSodium-Hydrogen ExchangersConceptsRecovery of intracellular
1995
Chloride-dependent Na-H Exchange A NOVEL MECHANISM OF SODIUM TRANSPORT IN COLONIC CRYPTS*
Rajendran V, Geibel J, Binder H. Chloride-dependent Na-H Exchange A NOVEL MECHANISM OF SODIUM TRANSPORT IN COLONIC CRYPTS*. Journal Of Biological Chemistry 1995, 270: 11051-11054. PMID: 7744735, DOI: 10.1074/jbc.270.19.11051.Peer-Reviewed Original ResearchMeSH KeywordsAmilorideAnimalsAnionsCell MembraneChloridesColonHydrogen-Ion ConcentrationIn Vitro TechniquesIntestinal MucosaKineticsMaleRatsRats, Sprague-DawleySodiumSodium-Hydrogen ExchangersConceptsNa-H exchangeColonic crypt cellsCrypt cellsAcid loadRat distal colonApical membrane vesiclesNovel transport processRate of intracellularDistal colonMM amilorideSodium transportApical membraneGradient stimulationColonic cryptsAmiloride inhibitionSodium movementNovel mechanismOutward gradientCompelling evidenceCellsSodiumUptakePrior studiesColonRecovery
1990
Angiotensin II stimulates both Na(+)-H+ exchange and Na+/HCO3- cotransport in the rabbit proximal tubule.
Geibel J, Giebisch G, Boron W. Angiotensin II stimulates both Na(+)-H+ exchange and Na+/HCO3- cotransport in the rabbit proximal tubule. Proceedings Of The National Academy Of Sciences Of The United States Of America 1990, 87: 7917-7920. PMID: 2172967, PMCID: PMC54862, DOI: 10.1073/pnas.87.20.7917.Peer-Reviewed Original ResearchConceptsAngiotensin IIHCO3- reabsorptionProximal tubulesEffect of AIIS1 proximal tubulesNM angiotensin IIPH-sensitive fluorescent dye 2Rat proximal tubuleRabbit proximal tubuleSuperficial nephronsPotent stimulusBasolateral administrationRabbit kidneyFluorescent dye 2Basolateral solutionBasolateral stepTransporter activityTubulesIonic mechanismsCotransportKidneyAdministrationNephron
1989
Mechanism of aldosterone-induced increase of K+ conductance in early distal renal tubule cells of the frog
Wang W, Henderson R, Geibel J, White S, Giebisch G. Mechanism of aldosterone-induced increase of K+ conductance in early distal renal tubule cells of the frog. The Journal Of Membrane Biology 1989, 111: 277-289. PMID: 2557452, DOI: 10.1007/bf01871012.Peer-Reviewed Original ResearchConceptsEarly distal tubule cellsTubule cellsDistal renal tubule cellsFrog kidneyWhole-cell voltage-clamp techniqueRemoval of aldosteronePresence of aldosteroneAldosterone-induced increaseType II channelsDistal tubule cellsOuabain-treated cellsPatch-clamp techniqueRenal tubule cellsVoltage-clamp techniquePresence of furosemideAldosterone treatmentAldosteroneIncubation of cellsKidneyOpen probabilityDistal cellsHrCellsIntracellularComplete absenceBasolateral sodium-coupled acid-base transport mechanisms of the rabbit proximal tubule
Geibel J, Giebisch G, Boron W. Basolateral sodium-coupled acid-base transport mechanisms of the rabbit proximal tubule. American Journal Of Physiology 1989, 257: f790-f797. PMID: 2556038, DOI: 10.1152/ajprenal.1989.257.5.f790.Peer-Reviewed Original ResearchMeSH Keywords4,4'-Diisothiocyanostilbene-2,2'-Disulfonic Acid4-Acetamido-4'-isothiocyanatostilbene-2,2'-disulfonic AcidAcid-Base EquilibriumAnimalsBiological TransportBiomechanical PhenomenaCarrier ProteinsChloridesDrug ResistanceHydrogen-Ion ConcentrationKidney Tubules, ProximalRabbitsSodiumSodium-Hydrogen Exchangers