2002
The role of endothelin in proximal tubule proton secretion and the adaptation to a chronic metabolic acidosis.
Laghmani K, Preisig PA, Alpern RJ. The role of endothelin in proximal tubule proton secretion and the adaptation to a chronic metabolic acidosis. Journal Of Nephrology 2002, 15 Suppl 5: s75-87. PMID: 12027224.Peer-Reviewed Original ResearchConceptsProximal tubulesMetabolic acidosisEndothelin-1NHE3 activityRole of endothelinImmediate early gene c-fosEndothelin B receptorEarly gene c-fosChronic metabolic acidosisGene c-fosKidney functionActivation of Pyk2Endothelin effectsApical membrane NHE3NHE3 abundanceB receptorEndothelinApical membraneAcidosisSecretionEffector agentsC-fosTubulesProton secretionC-Jun
1997
Adaptation to low-K+ media increases H(+)-K(+)-ATPase but not H(+)-ATPase-mediated pHi recovery in OMCD1 cells
Guntupalli J, Onuigbo M, Wall S, Alpern RJ, DuBose TD. Adaptation to low-K+ media increases H(+)-K(+)-ATPase but not H(+)-ATPase-mediated pHi recovery in OMCD1 cells. American Journal Of Physiology 1997, 273: c558-c571. PMID: 9277353, DOI: 10.1152/ajpcell.1997.273.2.c558.Peer-Reviewed Original Research
1996
Glucocorticoids regulate NHE-3 transcription in OKP cells
Baum M, Amemiya M, Dwarakanath V, Alpern RJ, Moe OW. Glucocorticoids regulate NHE-3 transcription in OKP cells. American Journal Of Physiology 1996, 270: f164-f169. PMID: 8769835, DOI: 10.1152/ajprenal.1996.270.1.f164.Peer-Reviewed Original ResearchConceptsNHE-3 mRNA abundanceGlucocorticoid-mediated increaseOKP cellsDexamethasone-treated cellsNHE-3 mRNAMRNA abundanceTwo- to threefold increaseAntiporter activitySynthetic glucocorticoidProximal tubulesApical proton secretionM dexamethasoneDexamethasoneNHE-3GlucocorticoidsTime courseProton secretionThreefold increasePresent studyCellsGene transcriptionMRNASecretionActivity
1995
Chronic regulation of the proximal tubular Na/H antiporter: From HCO3 to SRC
Alpern R, Moe O, Preisig P. Chronic regulation of the proximal tubular Na/H antiporter: From HCO3 to SRC. Kidney International 1995, 48: 1386-1396. PMID: 8544394, DOI: 10.1038/ki.1995.427.Peer-Reviewed Original ResearchConceptsNa/H antiporterChronic regulationH secretionProximal tubulesH antiporterNaCl absorptionProximal tubular acidificationMajor siteNa/K pumpCitrate reabsorptionBasolateral membraneTubular acidificationAcute regulationLuminal membraneK pumpExcretionReabsorptionSecretionPivotal roleVacuolar H-ATPaseH-ATPaseTubules
1992
Renal Acidification: Cellular Mechanisms of Tubular Transport and Regulation
Alpern R, Rector F. Renal Acidification: Cellular Mechanisms of Tubular Transport and Regulation. 1992, 767-812. DOI: 10.1002/cphy.cp080118.Peer-Reviewed Original Research
1991
Effects of endothelin on in vitro renin secretion
Moe O, Tejedor A, Campbell WB, Alpern RJ, Henrich WL. Effects of endothelin on in vitro renin secretion. American Journal Of Physiology 1991, 260: e521-e525. PMID: 2018117, DOI: 10.1152/ajpendo.1991.260.4.e521.Peer-Reviewed Original ResearchConceptsRat kidney cortical slicesRenin secretionKidney cortical slicesEndothelin-1Juxtaglomerular cellsRenin releaseCortical slicesRenin inhibitionBasal renin releaseVitro renin secretionBasal renin secretionRenal renin secretionEffects of endothelinIntracellular calcium bufferAddition of isoproterenolMechanism of actionRenin inhibitorsIsoproterenolSecretionCalcium bufferDistinct preparationsBAPTASimilar effectsDirect effectInhibitionMechanism of Distal Acidification: Relevance to Distal RTA
Alpern R. Mechanism of Distal Acidification: Relevance to Distal RTA. 1991, 1184-1188. DOI: 10.1007/978-3-662-35158-1_119.Peer-Reviewed Original ResearchMinimal urinary pHH secretionUrinary pHDistal acidificationLuminal pHDistal Na deliveryPresence of hyperkalemiaCortical collecting tubuleDistal RTAHigher luminal pHTubule functionAcid secretionDistal nephronDisease processK secretionCollecting tubuleSecretionNa deliveryHCO3- exchangerAbnormal leakMinimal gradientH pumpHyperkalemiaAldosteroneMembrane ATP
1987
Role of the Na+/H+ antiporter in rat proximal tubule bicarbonate absorption.
Preisig PA, Ives HE, Cragoe EJ, Alpern RJ, Rector FC. Role of the Na+/H+ antiporter in rat proximal tubule bicarbonate absorption. Journal Of Clinical Investigation 1987, 80: 970-978. PMID: 2888788, PMCID: PMC442334, DOI: 10.1172/jci113190.Peer-Reviewed Original Research
1984
Bicarbonate-water interactions in the rat proximal convoluted tubule. An effect of volume flux on active proton secretion.
Alpern RJ. Bicarbonate-water interactions in the rat proximal convoluted tubule. An effect of volume flux on active proton secretion. The Journal Of General Physiology 1984, 84: 753-770. PMID: 6096481, PMCID: PMC2228763, DOI: 10.1085/jgp.84.5.753.Peer-Reviewed Original Research
1983
Effects of extracellular fluid volume and plasma bicarbonate concentration on proximal acidification in the rat.
Alpern RJ, Cogan MG, Rector FC. Effects of extracellular fluid volume and plasma bicarbonate concentration on proximal acidification in the rat. Journal Of Clinical Investigation 1983, 71: 736-746. PMID: 6826733, PMCID: PMC436924, DOI: 10.1172/jci110821.Peer-Reviewed Original ResearchConceptsNet bicarbonate absorptionExtracellular fluid volumeVolume-expanded ratsLuminal bicarbonate concentrationPlasma bicarbonate concentrationBicarbonate absorptionVolume statusFluid volumeBicarbonate concentrationProton secretionExtracellular fluid volume statusBicarbonate permeabilityFluid volume statusPeritubular bicarbonate concentrationsProximal acidificationHydropenic ratsRatsAcidotic ratsSecretionAbove inhibitionLuminal compositionAlkalosisVolume expansionTubulesMM bicarbonate
1982
Effect of luminal bicarbonate concentration on proximal acidification in the rat
Alpern RJ, Cogan MG, Rector FC. Effect of luminal bicarbonate concentration on proximal acidification in the rat. American Journal Of Physiology 1982, 243: f53-f59. PMID: 7091367, DOI: 10.1152/ajprenal.1982.243.1.f53.Peer-Reviewed Original ResearchConceptsLuminal bicarbonate concentrationBicarbonate absorptionBicarbonate concentrationNet bicarbonate absorptionProximal convoluted tubulesProximal tubular acidificationProton secretionBicarbonate leakProximal acidificationTubular acidificationConvoluted tubulesBicarbonate permeabilitySecretionRats