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 studyActivationCells
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 ResearchConceptsNa-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 solution
1993
Mechanism of apical K+ channel modulation in principal renal tubule cells. Effect of inhibition of basolateral Na(+)-K(+)-ATPase.
Wang W, Geibel J, Giebisch G. Mechanism of apical K+ channel modulation in principal renal tubule cells. Effect of inhibition of basolateral Na(+)-K(+)-ATPase. The Journal Of General Physiology 1993, 101: 673-694. PMID: 8393065, PMCID: PMC2216783, DOI: 10.1085/jgp.101.5.673.Peer-Reviewed Original ResearchConceptsEffect of inhibitionPump inhibitionInhibitory effectChannel activityProtein kinase CPump activityAddition of strophanthidinPatch-clamp techniqueRenal tubule cellsBath solutionCell-attached patchesExtracellular Ca2Removal of Ca2Intracellular Ca2MicroM ionomycinTubule cellsControl valuesLow-conductance K channelsPrincipal cellsChannel modulationK channelsInhibitionNM staurosporineDependent protein kinase CPotent inhibitor
1990
A potassium channel in the apical membrane of rabbit thick ascending limb of Henle's loop
Wang W, White S, Geibel J, Giebisch G. A potassium channel in the apical membrane of rabbit thick ascending limb of Henle's loop. American Journal Of Physiology 1990, 258: f244-f253. PMID: 2309888, DOI: 10.1152/ajprenal.1990.258.2.f244.Peer-Reviewed Original ResearchConceptsCell-attached patchesHenle's loopPipette solutionPotassium channelsOutward slope conductanceRabbit kidneyBath solutionSlope conductanceThick ascending limbChannel activityPatch-clamp techniqueInward slope conductanceApical membraneVoltage-dependent mannerAscending limbSingle potassium channelsKidneyPossible intracellular regulatorsIntracellular regulatorsOpen probabilityLimb