2022
Colonic Fluid and Electrolyte Transport 2022: An Update
Negussie AB, Dell AC, Davis BA, Geibel JP. Colonic Fluid and Electrolyte Transport 2022: An Update. Cells 2022, 11: 1712. PMID: 35626748, PMCID: PMC9139964, DOI: 10.3390/cells11101712.Peer-Reviewed Original ResearchConceptsCystic fibrosis transmembrane regulatorCell death regulationSignal transduction pathwaysDeath regulationNa-K-Cl cotransporterEpithelial cell deathTransduction pathwaysIon homeostasisRegulatory relationshipsIon transportersTransepithelial ion transportEpithelial sodium channelTransmembrane regulatorCell deathColonic epithelial cellsEpithelial cellsTransportersSodium channelsNa-H exchangerRegulationIon transportCancer pathologyPH modulationIon movementOsmotic gradient
2020
Penicillin G Induces H+, K+-ATPase via a Nitric Oxide-Dependent Mechanism in the Rat Colonic Crypt
Baratta VM, Norz V, Barahona MJ, Gisinger TM, Mulligan D, Geibel JP. Penicillin G Induces H+, K+-ATPase via a Nitric Oxide-Dependent Mechanism in the Rat Colonic Crypt. Cellular Physiology And Biochemistry 2020, 54: 1132-1142. PMID: 33175479, PMCID: PMC8095381, DOI: 10.33594/000000305.Peer-Reviewed Original ResearchConceptsRat colonic cryptsColonic cryptsNitric oxideNitric oxide-dependent mechanismPotassium homeostasisArginine methyl esterAmmonium prepulse techniqueIntracellular nitric oxideSodium-free conditionsL-NAMEDiarrheal statesATPase activityBACKGROUND/Presence of NOPenicillin G sodium saltAcute exposureL-arginineSmall intestineIsolated administrationN-nitroHomeostatic conditionsCryptsPrepulse techniqueSignificant reductionNovel mechanism
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
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 tractIdentification 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 role
2011
Hypoxia Inhibits Colonic Ion Transport via Activation of AMP Kinase
Collins D, Kopic S, Bachlechner J, Ritter M, Winter DC, Geibel JP. Hypoxia Inhibits Colonic Ion Transport via Activation of AMP Kinase. Annals Of Surgery 2011, 254: 957-963. PMID: 21562404, DOI: 10.1097/sla.0b013e31821d477f.Peer-Reviewed Original ResearchConceptsCystic fibrosis transmembrane conductance regulatorChloride secretionMucosal hypoxiaAcute hypoxiaColonic electrolyte transportColonic mucosal functionIschemic intestinal injuryElectrogenic chloride secretionColonic ion transportPotential therapeutic targetHuman colonic mucosaIntracellular chloride concentrationRat colonic cryptsEpithelial ion transportFibrosis transmembrane conductance regulatorIschemic colitisIntestinal injuryColonic obstructionInhibition of CFTRMucosal functionAnastomotic failureAcute effectsColonic mucosaAdaptive cellular responseTransmembrane conductance regulatorFunctional 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 studiesThe flavonone naringenin inhibits chloride secretion in isolated colonic epithelia
Collins D, Kopic S, Geibel JP, Hogan AM, Medani M, Baird AW, Winter DC. The flavonone naringenin inhibits chloride secretion in isolated colonic epithelia. European Journal Of Pharmacology 2011, 668: 271-277. PMID: 21762688, DOI: 10.1016/j.ejphar.2011.06.052.Peer-Reviewed Original ResearchConceptsHuman colonic mucosaChloride secretionAntisecretory actionColonic mucosaCo-transporter inhibitorsEffect of naringeninIntracellular cAMP generationColonic cell lineAntisecretory effectColonic functionColorectal cancerProtective effectUssing chambersColonic epitheliumSecretory functionCAMP generationInhibitory actionBasolateral NKCC1Human colonRatsSecretionIntracellular acidificationConflicting resultsCell linesMucosa
2007
Characteristics of rat downregulated in adenoma (rDRA) expressed in HEK 293 cells
Barmeyer C, Ye JH, Sidani S, Geibel J, Binder HJ, Rajendran VM. Characteristics of rat downregulated in adenoma (rDRA) expressed in HEK 293 cells. Pflügers Archiv - European Journal Of Physiology 2007, 454: 441-450. PMID: 17492310, DOI: 10.1007/s00424-007-0213-7.Peer-Reviewed Original ResearchMeSH Keywords4,4'-Diisothiocyanostilbene-2,2'-Disulfonic AcidAmino Acid SequenceAnimalsAntiportersBase SequenceBicarbonatesCell LineChloridesCloning, MolecularColonDNA PrimersFatty Acids, VolatileHumansHydrogen-Ion ConcentrationIon TransportMolecular Sequence DataRatsRecombinant ProteinsSequence Homology, Amino AcidSulfate TransportersTransfectionConceptsRat distal colonDistal colonHEK-293 cellsExtracellular Cl- concentrationCrypt cellsMRNA expressionColonRatsDigestive tractCharacteristics of ratsAdenomasHigh rateDIDSCl- influxSurface cellsIntracellular acidApical membrane vesiclesCellsDisulfonic acidApical membraneCl- uptakePrior observationsUptakeLungJejunum
2005
Bicarbonate Secretion
Binder HJ, Rajendran V, Sadasivan V, Geibel JP. Bicarbonate Secretion. Journal Of Clinical Gastroenterology 2005, 39: s53-s58. PMID: 15758660, DOI: 10.1097/01.mcg.0000155521.81382.3a.Peer-Reviewed Original ResearchSECRETION AND ABSORPTION BY COLONIC CRYPTS
Geibel JP. SECRETION AND ABSORPTION BY COLONIC CRYPTS. Annual Review Of Physiology 2005, 67: 471-490. PMID: 15709966, DOI: 10.1146/annurev.physiol.67.031103.153530.Peer-Reviewed Original ResearchRole of short-chain fatty acids in colonic HCO3 secretion
Vidyasagar S, Barmeyer C, Geibel J, Binder HJ, Rajendran VM. Role of short-chain fatty acids in colonic HCO3 secretion. AJP Gastrointestinal And Liver Physiology 2005, 288: g1217-g1226. PMID: 15677553, DOI: 10.1152/ajpgi.00415.2004.Peer-Reviewed Original ResearchConceptsShort-chain fatty acidsSCFA/SCFA transportApical membrane vesiclesMM butyrateSurface epithelial cellsFatty acidsSCFA metabolismColonic mucosaHCO3- secretionCrypt cellsCarrier-mediated processLucite chamberSecretionColonic cryptsEpithelial cellsComparable degreeButyrate stimulationChannel activityButyrate uptakeStat techniqueCryptsAnion channel activityDIDSButyrate
2004
Functions and roles of the extracellular Ca2+-sensing receptor in the gastrointestinal tract
Hebert SC, Cheng S, Geibel J. Functions and roles of the extracellular Ca2+-sensing receptor in the gastrointestinal tract. Cell Calcium 2004, 35: 239-247. PMID: 15200147, DOI: 10.1016/j.ceca.2003.10.015.Peer-Reviewed Original ResearchConceptsNormal cell proliferationGastrointestinal tractEpithelial cellsNutrient availabilityIntestinal epithelial cellsPotential roleGastrointestinal epithelial cellsL-amino acidsFood digestionRapid turnoverNutrient absorptionCell proliferationWater homeostasisGastric acid secretionGastrointestinal biologyEntire gastrointestinal tractAllosteric modifierCalcium intakeSecretory diarrheaAcid secretionCalcium handlingExtracellular Ca2Colon cancerReceptorsPhysiological effectsExtracellular polyamines regulate fluid secretion in rat colonic crypts via the extracellular calcium-sensing receptor
Cheng SX, Geibel JP, Hebert SC. Extracellular polyamines regulate fluid secretion in rat colonic crypts via the extracellular calcium-sensing receptor. Gastroenterology 2004, 126: 148-158. PMID: 14699496, DOI: 10.1053/j.gastro.2003.10.064.Peer-Reviewed Original ResearchConceptsCalcium-sensing receptorColonic epithelial cellsFluid secretionColonic cryptsCalcium-sensing receptor activationExtracellular calcium-sensing receptorEpithelial cellsIntracellular D-myo-inositolNormal postnatal developmentRat colonic cryptsExtracellular polyaminesDistal colonDistal colonic cryptsSecond messenger generationDistal colonic epithelial cellsGastrointestinal epitheliumSecond messenger accumulationPostnatal developmentReceptor activationExtracellular spermineIntact cryptsReceptorsColonocyte functionSecretionCrypts
2003
Characterization of Cl-HCO3 exchange in basolateral membrane of rat distal colon
Ikuma M, Geibel J, Binder HJ, Rajendran VM. Characterization of Cl-HCO3 exchange in basolateral membrane of rat distal colon. American Journal Of Physiology - Cell Physiology 2003, 285: c912-c921. PMID: 12826602, DOI: 10.1152/ajpcell.00396.2002.Peer-Reviewed Original ResearchConceptsRat distal colonCl-HCO3 exchangeDistal colonBasolateral membraneHalf-maximal inhibitory constantsBasolateral membrane vesiclesCl- channel blockerColonic epithelial cellsAbsence of HCO3Channel blockersRat colonic epithelial cellsCrypt preparationCrypt cellsExchange inhibitorCl-OH exchangeRemoval of ClColonEpithelial cellsAnion exchange inhibitorHCO3- gradientProtease inhibitorsK ionophorePresent studyInhibitory constantsProtease inhibitor cocktail
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 mineralsCalciumCaSRAgonists
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 Research