2023
Modulation of potassium conductances optimizes fidelity of auditory information
Kaczmarek L. Modulation of potassium conductances optimizes fidelity of auditory information. Proceedings Of The National Academy Of Sciences Of The United States Of America 2023, 120: e2216440120. PMID: 36930599, PMCID: PMC10041146, DOI: 10.1073/pnas.2216440120.Peer-Reviewed Original ResearchMeSH KeywordsAction PotentialsAuditory PathwaysMembrane PotentialsPhosphorylationPotassiumPotassium ChannelsConceptsPotassium currentAuditory brainstem neuronsAuditory stimuliHigh-frequency firingGroups of neuronsLow-frequency stimuliBrainstem neuronsHigh-frequency stimuliIntrinsic excitabilityEnsembles of neuronsPostsynaptic neuronsAuditory neuronsNeurotransmitter releaseModulatory mechanismsAuditory stimulationFiring ratePotassium conductanceNeuronsPotassium channelsSingle neuronsAmplitude of currentsLoud soundsEnvironmental sound levelsChannel activityPositive membrane potentials
2013
A sodium-activated potassium channel supports high-frequency firing and reduces energetic costs during rapid modulations of action potential amplitude
Markham MR, Kaczmarek LK, Zakon HH. A sodium-activated potassium channel supports high-frequency firing and reduces energetic costs during rapid modulations of action potential amplitude. Journal Of Neurophysiology 2013, 109: 1713-1723. PMID: 23324315, PMCID: PMC3628015, DOI: 10.1152/jn.00875.2012.Peer-Reviewed Original Research
2002
Prolonged Activation of Ca2+-Activated K+Current Contributes to the Long-Lasting Refractory Period ofAplysia Bag Cell Neurons
Zhang Y, Magoski NS, Kaczmarek LK. Prolonged Activation of Ca2+-Activated K+Current Contributes to the Long-Lasting Refractory Period ofAplysia Bag Cell Neurons. Journal Of Neuroscience 2002, 22: 10134-10141. PMID: 12451114, PMCID: PMC6758731, DOI: 10.1523/jneurosci.22-23-10134.2002.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsAplysiaCalciumCells, CulturedElectric StimulationEnzyme ActivatorsEnzyme InhibitorsLarge-Conductance Calcium-Activated Potassium ChannelsNeural InhibitionNeuronsPatch-Clamp TechniquesPhloretinPotassiumPotassium Channel BlockersPotassium Channels, Calcium-ActivatedProtein Kinase CRefractory Period, ElectrophysiologicalSphingosineTetradecanoylphorbol AcetateConceptsBag cell neuronsCell neuronsRefractory periodBK currentsProtein kinase COnset of afterdischargeBK channel activityApplication of phloretinBK channel activatorsProlonged refractory periodAbility of stimulationRole of Ca2Blocker paxillinePharmacological characteristicsChannel activatorIntracellular Ca2Prolonged increaseOutward currentsInhibitor of PKCAfterdischargesNeuronsAdditional stimulationProlonged activationActivator of PKCChannel activity
1998
Depolarization Selectively Increases the Expression of the Kv3.1 Potassium Channel in Developing Inferior Colliculus Neurons
Liu S, Kaczmarek L. Depolarization Selectively Increases the Expression of the Kv3.1 Potassium Channel in Developing Inferior Colliculus Neurons. Journal Of Neuroscience 1998, 18: 8758-8769. PMID: 9786983, PMCID: PMC6793528, DOI: 10.1523/jneurosci.18-21-08758.1998.Peer-Reviewed Original ResearchMeSH KeywordsAgingAnimalsAnimals, NewbornCalciumGene Expression Regulation, DevelopmentalIn Vitro TechniquesInferior ColliculiMembrane PotentialsNeuropeptidesPatch-Clamp TechniquesPotassiumPotassium ChannelsPotassium Channels, Voltage-GatedRatsRats, Sprague-DawleyRNA, MessengerShaw Potassium ChannelsConceptsInferior colliculus neuronsOnset of hearingColliculus neuronsCalcium influxChannel subunitsPotassium currentAction potentialsElevated external potassium concentrationCalcium channel blockersDepolarization-induced increaseSpontaneous neuronal activityNoninactivating potassium currentKv3.1 potassium channelVoltage-clamp experimentsChannel blockersNeuronal excitabilityElevated potassiumAuditory neuronsNeuronal activityExternal potassium concentrationExternal potassium ionsNeuronsPotassium channelsMRNA levelsMarked increaseActivation of Kv3.1 channels in neuronal spine-like structures may induce local potassium ion depletion
Wang L, Gan L, Perney T, Schwartz I, Kaczmarek L. Activation of Kv3.1 channels in neuronal spine-like structures may induce local potassium ion depletion. Proceedings Of The National Academy Of Sciences Of The United States Of America 1998, 95: 1882-1887. PMID: 9465111, PMCID: PMC19207, DOI: 10.1073/pnas.95.4.1882.Peer-Reviewed Original ResearchConceptsSpine-like structuresIon channelsMembrane structureMembrane compartmentsVesicle compartmentKv3.1 channelsBulk cytoplasmElectron immunomicroscopyCHO cellsPostsynaptic membraneVesiclesMembrane patchesSpine-like protrusionsNeuronal membrane structurePotassium channel Kv3.1Channel Kv3.1CellsComplete inactivationInactivationCompartmentsRapid depletionCentral nervous systemSlow refillingSynaptic stimulationNeuronal structures
1996
Ionic Currents Underlying Developmental Regulation of Repetitive Firing in Aplysia Bag Cell Neurons
Nick T, Kaczmarek L, Carew T. Ionic Currents Underlying Developmental Regulation of Repetitive Firing in Aplysia Bag Cell Neurons. Journal Of Neuroscience 1996, 16: 7583-7598. PMID: 8922415, PMCID: PMC6579091, DOI: 10.1523/jneurosci.16-23-07583.1996.Peer-Reviewed Original ResearchConceptsBag cell neuronsRepetitive firingCell neuronsEgg-laying behaviorJuvenile neuronsTetraethyl ammonium chlorideDevelopmental regulationSpecific ionic currentsAplysia bag cell neuronsAfterdischargesElectrical stimulationVariety of stimuliDevelopmental controlNeuronal systemsProlonged depolarizationBehavioral effectsNeuronsIonic currentsDevelopmental mechanismsSelective regulationAdultsAplysia californicaFiringRegulationDepolarization
1995
A new family of outwardly rectifying potassium channel proteins with two pore domains in tandem
Ketchum K, Joiner W, Sellers A, Kaczmarek L, Goldstein S. A new family of outwardly rectifying potassium channel proteins with two pore domains in tandem. Nature 1995, 376: 690-695. PMID: 7651518, DOI: 10.1038/376690a0.Peer-Reviewed Original ResearchMeSH KeywordsAmino Acid SequenceAnimalsBase SequenceCaenorhabditis elegansCells, CulturedDNA PrimersDrosophilaMolecular Sequence DataOocytesPatch-Clamp TechniquesPotassiumPotassium ChannelsProtein ConformationRecombinant ProteinsSaccharomyces cerevisiaeSaccharomyces cerevisiae ProteinsSequence Homology, Amino AcidSodiumXenopus laevisConceptsP domainPotassium channel proteinCaenorhabditis elegansCommon structural motifChannel proteinsPore domainCellular membranesPrimary structureExcised membrane patchesSignature sequencesFlow of ionsAmino acidsXenopus laevisSelective currentMembrane potentialStructural motifsMembrane patchesPotassium channelsExternal divalent cationsDivalent cationsFunctional propertiesElegansVoltage-dependent mannerGenomeDomain
1994
A shab potassium channel contributes to action potential broadening in peptidergic neurons
Quattrocki E, Marshall J, Kaczmarek L. A shab potassium channel contributes to action potential broadening in peptidergic neurons. Neuron 1994, 12: 73-86. PMID: 8292361, DOI: 10.1016/0896-6273(94)90153-8.Peer-Reviewed Original ResearchMeSH KeywordsAction PotentialsAmino Acid SequenceAnimalsAplysiaBase SequenceCloning, MolecularDNA, ComplementaryFemaleInvertebrate HormonesKineticsMathematicsModels, TheoreticalMolecular Sequence DataNeuronsOocytesPolymerase Chain ReactionPotassiumPotassium ChannelsShab Potassium ChannelsTetraethylammoniumTetraethylammonium CompoundsTranscription, GeneticXenopus laevis
1992
Expression of the H-ras oncogene induces potassium conductance and neuron-specific potassium channel mRNAs in the AtT20 cell line
Hemmick L, Perney T, Flamm R, Kaczmarek L, Birnberg N. Expression of the H-ras oncogene induces potassium conductance and neuron-specific potassium channel mRNAs in the AtT20 cell line. Journal Of Neuroscience 1992, 12: 2007-2014. PMID: 1607925, PMCID: PMC6575920, DOI: 10.1523/jneurosci.12-06-02007.1992.Peer-Reviewed Original ResearchConceptsRas-transfected cellsAtT20 cell lineAtT20 cellsEJ-ras oncogeneCell linesPotassium channelsVoltage-dependent potassium channelsRas proteinsPituitary-derived cellsMRNA speciesPlasma membraneSpliced productsPotassium channel mRNASame geneChannel mRNADifferential expressionPotassium currentExcitable cellsVoltage-dependent potassium currentsTwo- to threefold increaseMRNAOncogeneSpeciesExpressionPhenotype
1991
Dexamethasone increases potassium channel messenger RNA and activity in clonal pituitary cells.
Levitan E, Hemmick L, Birnberg N, Kaczmarek L. Dexamethasone increases potassium channel messenger RNA and activity in clonal pituitary cells. Endocrinology 1991, 5: 1903-8. PMID: 1791837, DOI: 10.1210/mend-5-12-1903.Peer-Reviewed Original ResearchConceptsPituitary cellsChannel expressionClonal rat pituitary cellsChannel messenger RNAIon channel expressionRat pituitary cellsDose-dependent mannerClonal pituitary cellsAnterior pituitaryLong-term effectsRat hypothalamusSimilar pharmacologyGlucocorticoid agonistGlucocorticoid hormonesChannel mRNAGH3 cellsElectrical activitySecretionSteady-state concentrationsTerm effectsPituitaryExcitable cellsHormoneIon channelsMessenger RNA
1990
Control of potassium currents and cyclic AMP levels by autoactive neuropeptides in Aplysia neurons
Loechner K, Kaczmarek L. Control of potassium currents and cyclic AMP levels by autoactive neuropeptides in Aplysia neurons. Brain Research 1990, 532: 1-6. PMID: 2178030, DOI: 10.1016/0006-8993(90)91733-w.Peer-Reviewed Original ResearchConceptsVoltage-dependent potassium currentsCyclic AMP levelsBag cell neuronsPotassium currentCell neuronsAMP levelsAlpha-BCPWhole-cell patch-clamp techniqueCell patch-clamp techniqueBag cell afterdischargeTransient voltage-dependent potassium currentPatch-clamp techniqueDelayed potassium currentPharmacologic elevationClamp techniqueOutward currentsAfterdischargesNeuronsCell peptidesAplysia neuronsNeuropeptidesBeta-BCPConsistent effectSecond messengerAlphaEstrogen induction of a small, putative K+ channel mRNA in rat uterus
Pragnell M, Snay K, Trimmer J, MacLusky N, Naftolin F, Kaczmarek L, Boyle M. Estrogen induction of a small, putative K+ channel mRNA in rat uterus. Neuron 1990, 4: 807-812. PMID: 2344412, DOI: 10.1016/0896-6273(90)90207-v.Peer-Reviewed Original ResearchConceptsMRNA speciesAmino acid proteinProkaryotic ion channelsDramatic long-term changesMolecular cloningAcid proteinIon channel expressionMammalian sourcesIon channelsXenopus oocytesVoltage-dependent channelsSpeciesStructural motifsCritical roleChannel expressionMRNAChannel mRNAEstrogen inductionLong-term changesInductionCloningProteinMotifRegulationOocytes
1987
Hormonal regulation of K+-channel messenger RNA in rat myometrium during oestrus cycle and in pregnancy
Boyle M, MacLusky N, Naftolin F, Kaczmarek L. Hormonal regulation of K+-channel messenger RNA in rat myometrium during oestrus cycle and in pregnancy. Nature 1987, 330: 373-375. PMID: 2446134, DOI: 10.1038/330373a0.Peer-Reviewed Original ResearchConceptsChannel messenger RNAUterine smooth muscle cellsSmooth muscle excitabilityEnd of pregnancyPresence of estrogenSmooth muscle cellsIon channelsEstrogen altersPregnant ratsHormonal treatmentMyometrial cellsRat myometriumSteroid hormonesMuscle cellsOestrous cycleCellular excitabilityOestrus cycleVoltage-dependent ion channelsHormonal regulationPregnancyEstrogenExcitabilityElectrical couplingMessenger RNAMessenger RNA speciesXenopus Oocytes Injected with Rat Uterine RNA Express Very Slowly Activating Potassium Currents
Boyle M, Azhderian E, MacLusky N, Naftolin F, Kaczmarek L. Xenopus Oocytes Injected with Rat Uterine RNA Express Very Slowly Activating Potassium Currents. Science 1987, 235: 1221-1224. PMID: 2434999, DOI: 10.1126/science.2434999.Peer-Reviewed Original ResearchConceptsUterine smooth muscleSmooth musclePotassium currentAction potentialsVoltage-dependent potassium currentsInfluence of estrogenUteri of estrogenXenopus Oocytes InjectedOvariectomized ratsRat brainProlonged burstsEstrogenRepetitive burstsNegative membrane potentialsInjected oocytesRatsExcitable tissuesMuscleXenopus oocytesMembrane potentialOocytesDepolarizationMyometriumUterusBrain
1986
Multiple components of delayed potassium current in peptidergic neurons of Aplysia: modulation by an activator of adenylate cyclase
Strong J, Kaczmarek L. Multiple components of delayed potassium current in peptidergic neurons of Aplysia: modulation by an activator of adenylate cyclase. Journal Of Neuroscience 1986, 6: 814-822. PMID: 2420948, PMCID: PMC6568473, DOI: 10.1523/jneurosci.06-03-00814.1986.Peer-Reviewed Original ResearchConceptsAction potentialsApplication of forskolinBag cell neuronsPotassium currentCell neuronsOutward currentsWhole-cell patch-clamp techniqueBag cell afterdischargePatch-clamp techniqueEffect of forskolinElevation of cAMPPeptidergic neuronsCalcium entryClamp techniqueAfterdischargesReproductive tractMsec depolarizationsAdenylate cyclasePrimary culturesHigh intracellular concentrationsNeuronsMin periodRepetitive activitySpike widthForskolin
1985
Enhancement of calcium current in Aplysia neurones by phorbol ester and protein kinase C
DeRiemer SA, Strong JA, Albert KA, Greengard P, Kaczmarek LK. Enhancement of calcium current in Aplysia neurones by phorbol ester and protein kinase C. Nature 1985, 313: 313-316. PMID: 2578617, DOI: 10.1038/313313a0.Peer-Reviewed Original ResearchConceptsProtein kinase CKinase CProtein kinase presentEndogenous protein kinase CKinase presentProtein kinase1Molecular mechanismsCellular componentsPhorbol ester TPAIon channelsPhorbol esterMammalian brainTumor-promoting phorbol ester TPAMollusc AplysiaPhysiological propertiesEnzymeNeuronal excitabilityDirect evidenceKinase1PhosphorylationProteinHigh concentrationsActivationAplysia
1984
A voltage-clamp analysis of currents underlying cyclic AMP-induced membrane modulation in isolated peptidergic neurons of Aplysia
Kaczmarek L, Strumwasser F. A voltage-clamp analysis of currents underlying cyclic AMP-induced membrane modulation in isolated peptidergic neurons of Aplysia. Journal Of Neurophysiology 1984, 52: 340-349. PMID: 6090605, DOI: 10.1152/jn.1984.52.2.340.Peer-Reviewed Original ResearchConceptsBag cell neuronsCell neuronsCyclic AMP analoguePotassium currentOutward currentsNormal ionic mediumOnset of afterdischargePhosphodiesterase-resistant cAMP analoguePeak inward currentsAMP analogueBag cell clustersDelayed potassium currentMinority of cellsSpontaneous dischargeCalcium currentPeptidergic neuronsVoltage-clamp analysisCell culturesTwo-electrode voltage clampInward currentsSodium currentNegative slope resistanceA-currentMarked reductionNeurons