2017
Acute Effects of Vitamin C Exposure On Colonic Crypts: Direct Modulation of pH Regulation
Aldajani MM, Vanicek CN, Alhazzaa N, Lysyy T, Agarwal R, Geibel JP. Acute Effects of Vitamin C Exposure On Colonic Crypts: Direct Modulation of pH Regulation. Cellular Physiology And Biochemistry 2017, 44: 377-387. PMID: 29132138, DOI: 10.1159/000484914.Peer-Reviewed Original ResearchConceptsVitamin CColonic cryptsAcute effectsDependent intracellular pH recoveryTumor formationIntracellular pH recoveryNew therapeutic agentsMM vitamin CColorectal cancerDistal colonLeading causeTranscellular passive diffusionBasolateral membraneAcute additionNormal colonic cryptsC exposureNutraceutical agentTherapeutic agentsPH recoveryIntracellular pH changesCancer cellsVitamin C.CryptsLow intracellularTight junctions
2014
The Putative Role of the Non-Gastric H+/K+-ATPase ATP12A (ATP1AL1) as Anti-Apoptotic Ion Transporter: Effect of the H+/K+ ATPase Inhibitor SCH28080 on Butyrate-Stimulated Myelomonocytic HL-60 Cells
Jakab M, Hofer S, Ravasio A, Huber F, Schmidt S, Hitzl W, Geibel JP, Fürst J, Ritter M. The Putative Role of the Non-Gastric H+/K+-ATPase ATP12A (ATP1AL1) as Anti-Apoptotic Ion Transporter: Effect of the H+/K+ ATPase Inhibitor SCH28080 on Butyrate-Stimulated Myelomonocytic HL-60 Cells. Cellular Physiology And Biochemistry 2014, 34: 1507-1526. PMID: 25322912, DOI: 10.1159/000366355.Peer-Reviewed Original ResearchMeSH KeywordsApoptosisButyratesCell Line, TumorCell MembraneH(+)-K(+)-Exchanging ATPaseHL-60 CellsHumansImidazolesIon TransportConceptsIntracellular acid loadHL-60 cellsAcute intracellular acid loadAcid loadMCV measurementsOsmotic cell shrinkageReal-time reverse transcription PCREarly apoptosisChanges of intracellularCD86 expressionFlow cytometric determinationReverse transcription-PCRBACKGROUND/Intracellular acidosisLoss of intracellularCell shrinkageHigher MCVFlow cytometryRT-PCRATP12APhosphatidylserine exposureUntreated cellsPotential roleMCVApoptosis
2013
Identification of Functionally Distinct Na-HCO3 Co-Transporters in Colon
Barmeyer C, Ye JH, Soroka C, Geibel P, Hingsammer LM, Weitgasser L, Atway D, Geibel JP, Binder HJ, Rajendran VM. Identification of Functionally Distinct Na-HCO3 Co-Transporters in Colon. PLOS ONE 2013, 8: e62864. PMID: 23690961, PMCID: PMC3653958, DOI: 10.1371/journal.pone.0062864.Peer-Reviewed Original ResearchConceptsNa-HCO3 cotransportDistal colonProximal colonNBC activityNBC isoformsRat colonColonic epithelial cellsCrypt glandsSensitive transporterHCO3- secretionColonHCO3-dependent mechanismEpithelial cellsSaturable processHOE694Isoform 1Basolateral membraneCotransportPCR analysisNorthern blotDIDSMolecular studiesMolecular identityApparent KiCritical roleActivation of the Ca2+-sensing receptor induces deposition of tight junction components to the epithelial cell plasma membrane
Jouret F, Wu J, Hull M, Rajendran V, Mayr B, Schöfl C, Geibel J, Caplan MJ. Activation of the Ca2+-sensing receptor induces deposition of tight junction components to the epithelial cell plasma membrane. Journal Of Cell Science 2013, 126: 5132-5142. PMID: 24013548, PMCID: PMC3828589, DOI: 10.1242/jcs.127555.Peer-Reviewed Original ResearchConceptsTJ assemblyMDCK cellsStable transfectionFunction mutant formZO-1Tight junction components ZO-1G protein-coupled receptorsHuman CaSRCell-cell contactEpithelial cell plasma membranesMadin-Darby canine kidney cellsCell plasma membraneStimulation of CaSRDivalent ion homeostasisCanine kidney cellsTight junctionsJunction-associated proteinsTight junction componentsEndogenous CaSRProtein kinasePlasma membraneIon homeostasisMutant formsChelator BAPTA-AMCell differentiation
2011
Angiotensin II Stimulates H+-ATPase Activity in Intercalated Cells from Isolated Mouse Connecting Tubules and Cortical Collecting Ducts
Wagner CA, Mohebbi N, Uhlig U, Giebisch GH, Breton S, Brown D, Geibel JP. Angiotensin II Stimulates H+-ATPase Activity in Intercalated Cells from Isolated Mouse Connecting Tubules and Cortical Collecting Ducts. Cellular Physiology And Biochemistry 2011, 28: 513-520. PMID: 22116365, PMCID: PMC3709473, DOI: 10.1159/000335112.Peer-Reviewed Original ResearchMeSH KeywordsAngiotensin IIAnimalsAnion Transport ProteinsBicarbonatesCell MembraneChloridesColchicineHydrogen-Ion ConcentrationImmunohistochemistryKidney CortexKidney Tubules, CollectingMacrolidesMaleMiceMice, Inbred C57BLReceptors, AngiotensinSaralasinSodiumSulfate TransportersVacuolar Proton-Translocating ATPasesConceptsCNT/CCDAngiotensin IICortical collecting ductsBicarbonate secretionChloride absorptionCollecting ductsType 1 angiotensin II receptorAngiotensin II stimulatesAngiotensin II receptorsAcid-base statusConnecting tubuleATPase activityII receptorsSpecific subtypesNephron segmentsIndependent intracellularAcid extrusionType BSecretionTubulesDuct systemDuctPendrinPresent studyCells
2006
Hypertonic Saline Attenuates Colonic Tumor Cell Metastatic Potential by Activating Transmembrane Sodium Conductance
Shields CJ, Winter DC, Geibel JP, O’Sullivan G, Wang JH, Redmond HP. Hypertonic Saline Attenuates Colonic Tumor Cell Metastatic Potential by Activating Transmembrane Sodium Conductance. The Journal Of Membrane Biology 2006, 211: 35-42. PMID: 16988862, DOI: 10.1007/s00232-006-0011-8.Peer-Reviewed Original ResearchConceptsHypertonic salineSodium-hydrogen exchangeIntegrin expressionIntracellular sodiumMetastatic potentialHuman colonic tumor cellsAdhesion molecule expressionSodium concentrationColonic tumor cellsTumor cell metastatic potentialIntracellular pHCell metastatic potentialCytosolic sodium concentrationMolecule expressionΒ1 integrin expressionHyperosmolar solutionsConfocal laser microscopic imagingEffect of hypertonicityTumor cellsInhibitory effectSodium responseHypertonic exposureCellular alkalinizationTumor cell-endothelial interactionsSodium conductance
2005
The B1-subunit of the H+ ATPase is required for maximal urinary acidification
Finberg KE, Wagner CA, Bailey MA, Păunescu T, Breton S, Brown D, Giebisch G, Geibel JP, Lifton RP. The B1-subunit of the H+ ATPase is required for maximal urinary acidification. Proceedings Of The National Academy Of Sciences Of The United States Of America 2005, 102: 13616-13621. PMID: 16174750, PMCID: PMC1224669, DOI: 10.1073/pnas.0506769102.Peer-Reviewed Original ResearchConceptsMaximal urinary acidificationNormal urinary acidificationMetabolic acidosisUrinary acidificationDistal renal tubular acidosisAcid challengeRenal tubular acidosisAcute intracellular acidificationB1 subunitLumen-negative potentialFurosemide infusionTubular acidosisAlkaline urineDistal nephronGreater severityAcidosisMiceLoss of B1Intracellular acidificationApical expressionUrineDuctFurther decreaseIsoformsPlasma membraneInsulin Receptor (IR) and Glucose Transporter 2 (GLUT2) Proteins Form a Complex on the Rat Hepatocyte Membrane
Eisenberg M, Maker A, Slezak L, Nathan J, Sritharan K, Jena B, Geibel J, Andersen D. Insulin Receptor (IR) and Glucose Transporter 2 (GLUT2) Proteins Form a Complex on the Rat Hepatocyte Membrane. Cellular Physiology And Biochemistry 2005, 15: 051-058. PMID: 15665515, DOI: 10.1159/000083638.Peer-Reviewed Original ResearchConceptsGlucose transporter 2Insulin receptorPlasma membranePlasma membrane insulin receptorsFluorescence resonance energy transfer studiesMembrane insulin receptorsHepatic glucose transportersGlucose transporterHepatocyte plasma membraneHepatic glucose regulationInsulin regulationGlucose transportBidirectional glucose transportRat hepatocyte membranesConfocal microscopyTransporter 2MembraneEnergy transfer studiesRegulationTexas RedComplexesEndosomesCytosolProteinTransportersFluorescent imaging of Cl- in Amphiuma red blood cells: How the nuclear exclusion of Cl- affects the plasma membrane potential
Hoffman JF, Geibel JP. Fluorescent imaging of Cl- in Amphiuma red blood cells: How the nuclear exclusion of Cl- affects the plasma membrane potential. Proceedings Of The National Academy Of Sciences Of The United States Of America 2005, 102: 921-926. PMID: 15637151, PMCID: PMC545567, DOI: 10.1073/pnas.0408597102.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsCell MembraneCell NucleusChlorineErythrocytesMembrane PotentialsMicroscopy, FluorescenceNitratesUrodelaConceptsPlasma membrane potentialMembrane potentialExclusion of ClNuclear exclusionCytoplasmic compartmentCellular ClAmphiuma red blood cellsCytoplasmNet negative chargeValues of EmCellsIntracellular ClRed blood cellsBlood cellsCell ClDistribution of ClFluorescent imagingEquilibrium distributionDNANucleusFluorescence intensitySensitive dyeCompartmentsRed cellsNegative charge
2004
Renal Vacuolar H+-ATPase
Wagner CA, Finberg KE, Breton S, Marshansky V, Brown D, Geibel JP. Renal Vacuolar H+-ATPase. Physiological Reviews 2004, 84: 1263-1314. PMID: 15383652, DOI: 10.1152/physrev.00045.2003.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus StatementsConceptsProximal tubular bicarbonate reabsorptionDistal renal tubular acidosisTubular bicarbonate reabsorptionRenal tubular acidosisFinal urinary acidificationTubular acidosisElectrolyte statusBicarbonate reabsorptionMonogenic defectsProximal tubulesUrinary acidificationKidneyATP-dependent transportVariety of factorsHigher numberPatientsIntracellular organellesAcidosisRegulatory proteinsLocalization patterns
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
2002
Expression of calcium-sensing receptor in rat colonic epithelium: evidence for modulation of fluid secretion
Cheng SX, Okuda M, Hall AE, Geibel JP, Hebert SC. Expression of calcium-sensing receptor in rat colonic epithelium: evidence for modulation of fluid secretion. AJP Gastrointestinal And Liver Physiology 2002, 283: g240-g250. PMID: 12065312, DOI: 10.1152/ajpgi.00500.2001.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBiological TransportBody FluidsCalciumCell LineCell MembraneColonHumansIn Vitro TechniquesIntestinal MucosaIntracellular MembranesMalePhosphatidylinositol Diacylglycerol-LyaseRatsRats, Sprague-DawleyReceptors, Calcium-SensingReceptors, Cell SurfaceTranscription, GeneticType C PhospholipasesConceptsCalcium-sensing receptorCrypt cellsFluid secretionNet fluid secretionIntestinal fluid transportRat colonic epitheliumCaSR agonistsIntracellular calciumExtracellular calciumColonic epitheliumDiarrheal diseaseCaSR transcriptsBath perfusateStimulatory effectBody cellsSecretionReceptorsCryptsElevated cAMPBasolateral surfaceCellsDivalent mineralsCalciumCaSRAgonistsCalcium-pump inhibitors induce functional surface expression of ΔF508-CFTR protein in cystic fibrosis epithelial cells
Egan ME, Glöckner-Pagel J, Ambrose C, Cahill PA, Pappoe L, Balamuth N, Cho E, Canny S, Wagner CA, Geibel J, Caplan MJ. Calcium-pump inhibitors induce functional surface expression of ΔF508-CFTR protein in cystic fibrosis epithelial cells. Nature Medicine 2002, 8: 485-492. PMID: 11984593, DOI: 10.1038/nm0502-485.Peer-Reviewed Original ResearchConceptsEndoplasmic reticulumCalcium pump inhibitorΔF508-CFTR proteinCystic fibrosis epithelial cellsCystic fibrosis transmembrane conductance regulator (CFTR) proteinCystic fibrosis cell lineFunctional surface expressionSurface expressionChaperone activityChaperone proteinsRegulator proteinPlasma membraneCystic fibrosis defectCell surfaceProteinCell linesPotential targetOptimal activityInhibitor thapsigarginEpithelial cellsExpressionCommon mutationsInhibitorsMouse modelReticulum
2001
Characterization 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 uptake
1999
Role 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
Sorting of Ion Pumps in Polarized Epithelial Cells.a
DUNBAR L, ROUSH D, COURTOIS‐COUTRY N, MUTH T, GOTTARDI CJ, RAJENDRAN V, GEIBEL J, KASHGARIAN M, CAPLAN M. Sorting of Ion Pumps in Polarized Epithelial Cells.a. Annals Of The New York Academy Of Sciences 1997, 834: 514-523. PMID: 9405853, DOI: 10.1111/j.1749-6632.1997.tb52309.x.Peer-Reviewed Original ResearchAmino Acid SequenceCell MembraneCell PolarityConserved SequenceEpithelial CellsH(+)-K(+)-Exchanging ATPaseHumansMacromolecular SubstancesModels, MolecularMolecular Sequence DataProtein Structure, SecondaryReceptors, TransferrinRecombinant Fusion ProteinsSequence AlignmentSequence Homology, Amino AcidSodium-Potassium-Exchanging ATPaseAN ATOMIC FORCE MICROSCOPIC EXAMINATION OF THE APICAL MEMBRANE OF THE MAMMALIAN GASTRIC GLAND
GEIBEL J. AN ATOMIC FORCE MICROSCOPIC EXAMINATION OF THE APICAL MEMBRANE OF THE MAMMALIAN GASTRIC GLAND. Cell Biology International 1997, 21: 727-736. PMID: 9768471, DOI: 10.1006/cbir.1997.0217.Peer-Reviewed Original ResearchLife on biomembranes viewed with the atomic force microscope.
Oberleithner H, Geibel J, Guggino W, Henderson R, Hunter M, Schneider S, Schwab A, Wang W. Life on biomembranes viewed with the atomic force microscope. Wiener Klinische Wochenschrift 1997, 109: 419-23. PMID: 9261980.Peer-Reviewed Original ResearchConceptsAtomic force microscopeForce microscopeNear-field microscopePlasma membrane turnoverSoft biological surfacesPore complexRenal epithelial cellsAtomic resolutionNuclear poresXenopus laevis oocytesNuclear envelopeAFM techniquesExperimental biologistsLaevis oocytesMembrane turnoverKidney cellsEpithelial cellsMicroscopePotassium channelsBirthday candlesBiological surfacesCellsBiomembranesMolecular structureRecent dataLocalization of amiloride-sensitive sodium channels in A6 cells by atomic force microscopy
Smith P, Bradford A, Schneider S, Benos D, Geibel J. Localization of amiloride-sensitive sodium channels in A6 cells by atomic force microscopy. American Journal Of Physiology 1997, 272: c1295-c1298. PMID: 9142855, DOI: 10.1152/ajpcell.1997.272.4.c1295.Peer-Reviewed Original ResearchConceptsAtomic force microscopyHigh-resolution imagingRenal epithelial cellsForce microscopyA6 cellsApical microvilliCell surface distributionBovine renal medullaEpithelial cellsA6 renal epithelial cellsAmiloride-sensitive sodium channelsEpithelial ion channelsColloidal gold particlesApical distributionIon channelsChannel complexGold particlesSodium channelsCellsMicrovilliNonimmune immunoglobulin GUnlabeled cellsMicroscopySurface distributionParticles