2023
High-throughput combined voltage-clamp/current-clamp analysis of freshly isolated neurons
Ghovanloo M, Tyagi S, Zhao P, Kiziltug E, Estacion M, Dib-Hajj S, Waxman S. High-throughput combined voltage-clamp/current-clamp analysis of freshly isolated neurons. Cell Reports Methods 2023, 3: 100385. PMID: 36814833, PMCID: PMC9939380, DOI: 10.1016/j.crmeth.2022.100385.Peer-Reviewed Original ResearchConceptsDorsal root ganglion neuronsCurrent-clamp recordingsCurrent-clamp analysisVoltage-gated sodium channelsPatch-clamp techniqueExcitable cellsGanglion neuronsElectrophysiological recordingsNeuronal cellsNeuronsGold standard methodologySodium channelsCellular levelRobotic instrumentsCellsDrug screeningSame cellsIntact tissueRecordings
2022
Fibroblast growth factor homologous factor 2 attenuates excitability of DRG neurons
Effraim PR, Estacion M, Zhao P, Sosniak D, Waxman SG, Dib-Hajj SD. Fibroblast growth factor homologous factor 2 attenuates excitability of DRG neurons. Journal Of Neurophysiology 2022, 128: 1258-1266. PMID: 36222860, PMCID: PMC9909838, DOI: 10.1152/jn.00361.2022.Peer-Reviewed Original ResearchConceptsDRG neuron excitabilityDRG neuronal excitabilityNeuronal excitabilityFibroblast growth factor homologous factorsNerve injuryDRG neuronsInflammatory mediatorsNeuron excitabilityDorsal root ganglion neuronsFunction of Nav1.7Peripheral nerve axotomyMultiple neurological disordersVoltage-gated sodium channelsDRG excitabilityFibroblast growth factor homologous factor 2Inflammatory painNerve axotomyGanglion neuronsIsoform-dependent mannerNeurological disordersBasal conditionsExcitabilityGating propertiesNeuron firingInjury
2016
Nav1.7-A1632G Mutation from a Family with Inherited Erythromelalgia: Enhanced Firing of Dorsal Root Ganglia Neurons Evoked by Thermal Stimuli
Yang Y, Huang J, Mis MA, Estacion M, Macala L, Shah P, Schulman BR, Horton DB, Dib-Hajj SD, Waxman SG. Nav1.7-A1632G Mutation from a Family with Inherited Erythromelalgia: Enhanced Firing of Dorsal Root Ganglia Neurons Evoked by Thermal Stimuli. Journal Of Neuroscience 2016, 36: 7511-7522. PMID: 27413160, PMCID: PMC6705539, DOI: 10.1523/jneurosci.0462-16.2016.Peer-Reviewed Original ResearchConceptsRat DRG neuronsDorsal root ganglion neuronsDRG neuronsCurrent-clamp recordingsSodium channel Nav1.7Pain syndromeNav1.7 mutationGanglion neuronsThermal stimuliIEM patientsChannel Nav1.7Whole-cell current-clamp recordingsNav1.7 channelsFunction Nav1.7 mutationsSevere pain syndromeVoltage-gated sodium channel Nav1.7Voltage-clamp recordingsMutant Nav1.7 channelsMean firing frequencyMultielectrode array recordingsMutant channelsG mutationMultigeneration familySpontaneous firingSympathetic neurons
2011
Intra- and Interfamily Phenotypic Diversity in Pain Syndromes Associated with a Gain-of-Function Variant of NaV1.7
Estación M, Han C, Choi JS, Hoeijmakers J, Lauria G, Drenth J, Gerrits MM, Dib-Hajj SD, Faber CG, Merkies I, Waxman SG. Intra- and Interfamily Phenotypic Diversity in Pain Syndromes Associated with a Gain-of-Function Variant of NaV1.7. Molecular Pain 2011, 7: 1744-8069-7-92. PMID: 22136189, PMCID: PMC3248882, DOI: 10.1186/1744-8069-7-92.Peer-Reviewed Original ResearchConceptsParoxysmal extreme pain disorderSmall fiber neuropathyDorsal root gangliaInherited ErythromelalgiaPain syndromeFunction variantsTrigeminal ganglionIdiopathic small fiber neuropathySevere facial painQuantitative sensory testingSympathetic ganglion neuronsDifferent clinical presentationsSodium channel Nav1.7Distal painNeuropathic painFacial painAutonomic symptomsDRG neuronsPain disordersClinical presentationClinical pictureSyndrome AssociatedGanglion neuronsRoot gangliaSkin biopsies
2010
A sodium channel mutation linked to epilepsy increases ramp and persistent current of Nav1.3 and induces hyperexcitability in hippocampal neurons
Estacion M, Gasser A, Dib-Hajj SD, Waxman SG. A sodium channel mutation linked to epilepsy increases ramp and persistent current of Nav1.3 and induces hyperexcitability in hippocampal neurons. Experimental Neurology 2010, 224: 362-368. PMID: 20420834, DOI: 10.1016/j.expneurol.2010.04.012.Peer-Reviewed Original ResearchConceptsHippocampal neuronsCardiac muscle sodium channelsCryptogenic partial epilepsyHippocampal neuron excitabilitySodium channelsSomatic pain disordersDifferent sodium channel isoformsHuman chromosome 2Sodium channel isoformsPain disordersPartial epilepsyNeuron excitabilityPathophysiological basisExcitability disordersSpontaneous firingSodium channel mutationsGene SCN1ASodium channelopathiesCharge-neutralizing mutationsRamp currentsMuscle sodium channelsChromosome 2Channel isoformsChannel mutationsFunctional analysis
2008
NaV1.7 Gain-of-Function Mutations as a Continuum: A1632E Displays Physiological Changes Associated with Erythromelalgia and Paroxysmal Extreme Pain Disorder Mutations and Produces Symptoms of Both Disorders
Estacion M, Dib-Hajj SD, Benke PJ, Morsche R, Eastman EM, Macala LJ, Drenth JP, Waxman SG. NaV1.7 Gain-of-Function Mutations as a Continuum: A1632E Displays Physiological Changes Associated with Erythromelalgia and Paroxysmal Extreme Pain Disorder Mutations and Produces Symptoms of Both Disorders. Journal Of Neuroscience 2008, 28: 11079-11088. PMID: 18945915, PMCID: PMC6671384, DOI: 10.1523/jneurosci.3443-08.2008.Peer-Reviewed Original ResearchMeSH KeywordsAlanineAnimalsAnimals, NewbornCells, CulturedChildDose-Response Relationship, RadiationElectric StimulationErythromelalgiaGanglia, SpinalGlutamic AcidHumansMaleMembrane PotentialsModels, MolecularMutationNAV1.7 Voltage-Gated Sodium ChannelNeuronsPatch-Clamp TechniquesRatsRats, Sprague-DawleySodium ChannelsSomatoform DisordersTime FactorsTransfectionConceptsParoxysmal extreme pain disorderDorsal root gangliaTrigeminal ganglion neuronsClinical phenotypeGanglion neuronsMixed clinical phenotypePersistent inward currentsFunction mutationsPatch-clamp analysisPEPD mutationsPain disordersFast inactivationRoot gangliaInward currentsDistinct disordersCurrent clampErythromelalgiaDisordersPainChannel functionVoltage dependencePhysiological changesNeuronsIEMPhenotypeParoxysmal Extreme Pain Disorder M1627K Mutation in Human Nav1.7 Renders DRG Neurons Hyperexcitable
Dib-Hajj SD, Estacion M, Jarecki BW, Tyrrell L, Fischer TZ, Lawden M, Cummins TR, Waxman SG. Paroxysmal Extreme Pain Disorder M1627K Mutation in Human Nav1.7 Renders DRG Neurons Hyperexcitable. Molecular Pain 2008, 4: 1744-8069-4-37. PMID: 18803825, PMCID: PMC2556659, DOI: 10.1186/1744-8069-4-37.Peer-Reviewed Original ResearchConceptsParoxysmal extreme pain disorderDRG neuronsAction potentialsVoltage-gated sodium channel Nav1.7Severe pain episodesCurrent-clamp recordingsSingle action potentialSodium channel Nav1.7K mutationPain episodesPainful neuropathyPain disordersMutant channelsChannel Nav1.7Mandibular areaSporadic casesBowl movementRamp stimuliNeuronsClosed-state inactivationEnglish patientsPainPatientsK channelsFunction mutations