2001
In vivo13C NMR measurement of neurotransmitter glutamate cycling, anaplerosis and TCA cycle flux in rat brain during [2‐13C]glucose infusion
Sibson N, Mason G, Shen J, Cline G, Herskovits A, Wall J, Behar K, Rothman D, Shulman R. In vivo13C NMR measurement of neurotransmitter glutamate cycling, anaplerosis and TCA cycle flux in rat brain during [2‐13C]glucose infusion. Journal Of Neurochemistry 2001, 76: 975-989. PMID: 11181817, DOI: 10.1046/j.1471-4159.2001.00074.x.Peer-Reviewed Original ResearchConceptsGlutamate/glutamine cyclingCerebral cortexAstrocytic tricarboxylic acid cycleGlutamine cyclingRat cerebral cortexGlutamine synthesisDe novo glutamine synthesisAnesthetized ratsRat brainNeurotransmitter glutamateHyperammonemic conditionsGlutamate cyclingInfusionGlutamate precursorCortexBrainTCA cycle fluxAnaplerosisMajor metabolic fluxTricarboxylic acid cycleCycle flux
1999
Determination of the rate of the glutamate/glutamine cycle in the human brain by in vivo 13C NMR
Shen J, Petersen K, Behar K, Brown P, Nixon T, Mason G, Petroff O, Shulman G, Shulman R, Rothman D. Determination of the rate of the glutamate/glutamine cycle in the human brain by in vivo 13C NMR. Proceedings Of The National Academy Of Sciences Of The United States Of America 1999, 96: 8235-8240. PMID: 10393978, PMCID: PMC22218, DOI: 10.1073/pnas.96.14.8235.Peer-Reviewed Original ResearchConceptsGlutamate/glutamine cycleGlutamine cycleCerebral cortexMin/Rat cerebral cortexVivo 13C NMR spectraGlucose oxidation ratesHuman brainGlucose oxidationGlutamatergic activityRat modelTricarboxylic acid cycle rateParietal lobeHuman cortexCortexTime courseBrainGlutamine synthesisMajor metabolic fluxCycle rateTricarboxylic acid cycleHigh levelsInfusionRatsAcid cycle
1997
Homocarnosine and the measurement of neuronal pH in patients with epilepsy
Rothman D, Behar K, Prichard J, Petroff O. Homocarnosine and the measurement of neuronal pH in patients with epilepsy. Magnetic Resonance In Medicine 1997, 38: 924-929. PMID: 9402193, DOI: 10.1002/mrm.1910380611.Peer-Reviewed Original Research
1996
Short echo time proton magnetic resonance spectroscopic imaging of macromolecule and metabolite signal intensities in the human brain
Hwang J, Graham G, Behar K, Alger J, Prichard J, Rothman D. Short echo time proton magnetic resonance spectroscopic imaging of macromolecule and metabolite signal intensities in the human brain. Magnetic Resonance In Medicine 1996, 35: 633-639. PMID: 8722812, DOI: 10.1002/mrm.1910350502.Peer-Reviewed Original ResearchConceptsSubacute stroke patientsProton magnetic resonance spectroscopicProton magnetic resonance spectroscopic imagingMagnetic resonance spectroscopic imagingStroke patientsHealthy subjectsMagnetic resonance spectroscopicMetabolite signal intensitiesBrain regionsPathological conditionsMacromolecule resonancesHuman brainBrainSignal intensitySubjectsRecovery timeSpectroscopic imagingPatients
1995
Initial Observations on Effect of Vigabatrin on In Vivo 1H Spectroscopic Measurements of γ‐Aminobutyric Acid, Glutamate, and Glutamine in Human Brain
Petroff O, Rothman D, Behar K, Mattson R. Initial Observations on Effect of Vigabatrin on In Vivo 1H Spectroscopic Measurements of γ‐Aminobutyric Acid, Glutamate, and Glutamine in Human Brain. Epilepsia 1995, 36: 457-464. PMID: 7614922, DOI: 10.1111/j.1528-1157.1995.tb00486.x.Peer-Reviewed Original ResearchConceptsGamma-aminobutyric acidGABA levelsMumol/Antiepileptic drugsOccipital GABA levelsEffective antiepileptic drugEffects of vigabatrinStandard medicationStandard doseΓ-aminobutyric acidHealthy subjectsEpileptic patientsVigabatrinPatientsGABA transaminaseHuman cerebrumNoninvasive measurementHuman brainBrainGlutamateInitial observationsMedicationsCerebrumLevelsDose
1994
Analysis of macromolecule resonances in 1H NMR spectra of human brain
Behar K, Rothman D, Spencer D, Petroff O. Analysis of macromolecule resonances in 1H NMR spectra of human brain. Magnetic Resonance In Medicine 1994, 32: 294-302. PMID: 7984061, DOI: 10.1002/mrm.1910320304.Peer-Reviewed Original ResearchDynamic Magnetic Resonance Imaging of the Rat Brain during Forepaw Stimulation
Hyder F, Behar K, Martin M, Blamire A, Shulman R. Dynamic Magnetic Resonance Imaging of the Rat Brain during Forepaw Stimulation. Cerebrovascular And Brain Metabolism Reviews 1994, 14: 649-655. PMID: 8014212, DOI: 10.1038/jcbfm.1994.81.Peer-Reviewed Original ResearchConceptsSomatosensory areaChloralose-anesthetized ratsDynamic magnetic resonance imagingMagnetic resonance imagingForelimb motorForepaw stimulationRat brainBrain mapping methodsElectrical stimulationMR signal intensityParietal cortexResonance imagingBrain tissueCoronal planeFractional signal changeStimulationSignal changesOxygenation stateSignal intensityRatsAnteriorCortexBloodBrainMeasurement of GABA following GABA‐transaminase inhibition by gabaculine: A 1H and 31P NMR spectroscopic study of rat brain in vivo
Behar K, Boehm D. Measurement of GABA following GABA‐transaminase inhibition by gabaculine: A 1H and 31P NMR spectroscopic study of rat brain in vivo. Magnetic Resonance In Medicine 1994, 31: 660-667. PMID: 7914662, DOI: 10.1002/mrm.1910310612.Peer-Reviewed Original ResearchMeSH Keywords4-Aminobutyrate TransaminaseAnimalsAspartic AcidBrainBrain ChemistryCreatineCyclohexanecarboxylic AcidsGamma-Aminobutyric AcidGlutamatesGlutamic AcidHydrogenHydrogen-Ion ConcentrationMagnetic Resonance SpectroscopyMaleNucleotidesPhosphatesPhosphocreatinePhosphorusRatsRats, Sprague-Dawley
1993
Localized 1H NMR measurements of gamma-aminobutyric acid in human brain in vivo.
Rothman D, Petroff O, Behar K, Mattson R. Localized 1H NMR measurements of gamma-aminobutyric acid in human brain in vivo. Proceedings Of The National Academy Of Sciences Of The United States Of America 1993, 90: 5662-5666. PMID: 8516315, PMCID: PMC46781, DOI: 10.1073/pnas.90.12.5662.Peer-Reviewed Original ResearchConceptsGamma-aminobutyric acidGABA concentrationGABA-transaminase inhibitor vigabatrinBrain gamma-aminobutyric acidDose-dependent elevationSeizure suppressionOccipital lobeHigh doseNonepileptic subjectsHuman volunteersHuman cortexVigabatrinDrug vigabatrinBrainPatientsHuman brainVolunteersCortexDose
1992
NMR Determination of the TCA Cycle Rate and α-Ketoglutarate/Glutamate Exchange Rate in Rat Brain
Mason G, Rothman D, Behar K, Shulman R. NMR Determination of the TCA Cycle Rate and α-Ketoglutarate/Glutamate Exchange Rate in Rat Brain. Cerebrovascular And Brain Metabolism Reviews 1992, 12: 434-447. PMID: 1349022, DOI: 10.1038/jcbfm.1992.61.Peer-Reviewed Original Research
1989
NMR Spectroscopic Investigation of the Recovery of Energy and Acid—Base Homeostasis in the Cat Brain after Prolonged Ischemia
Behar K, Rothman D, Hossmann K. NMR Spectroscopic Investigation of the Recovery of Energy and Acid—Base Homeostasis in the Cat Brain after Prolonged Ischemia. Cerebrovascular And Brain Metabolism Reviews 1989, 9: 655-665. PMID: 2777935, DOI: 10.1038/jcbfm.1989.93.Peer-Reviewed Original ResearchEffects of Hypercarbia and Porta-Caval Shunting on Amino Acids and High Energy Phosphates of the Rat Brain: a 1H and 31P NMR Study
Behar K, Fitzpatrick S. Effects of Hypercarbia and Porta-Caval Shunting on Amino Acids and High Energy Phosphates of the Rat Brain: a 1H and 31P NMR Study. Experimental Biology And Medicine 1989, 189-200. DOI: 10.1007/978-1-4612-4506-3_13.Peer-Reviewed Original ResearchRat brainCerebral amino acidsEffects of hypercarbiaConcentration of glutamateHigh-energy phosphatesPorta-cavalCerebral hypoxiaMetabolic encephalopathiesHypercarbic acidosisAcute hyperammonemiaCerebral glutamateIntracellular acidosisEnergy phosphatesIncrease of glutamineHypercarbiaEncephalopathyAcidosisHyperammonemiaGlutamateBrainAmino acidsIntracellularIschemiaSeizuresShunting
1987
Combined 1H and 31P NMR Studies of the Rat Brain in Vivo: Effects of Altered Intracellular pH on Metabolisma
BEHAR K, ROTHMAN D, FITZPATRICK S, HETHERINGTON H, SHULMAN R. Combined 1H and 31P NMR Studies of the Rat Brain in Vivo: Effects of Altered Intracellular pH on Metabolisma. Annals Of The New York Academy Of Sciences 1987, 508: 81-88. PMID: 3125776, DOI: 10.1111/j.1749-6632.1987.tb32896.x.Chapters
1986
Detection of metabolites in rabbit brain by 13C NMR spectroscopy following administration of [1‐13C]glucose
Behar K, Petroff O, Prichard J, Alger J, Shulman R. Detection of metabolites in rabbit brain by 13C NMR spectroscopy following administration of [1‐13C]glucose. Magnetic Resonance In Medicine 1986, 3: 911-920. PMID: 2881185, DOI: 10.1002/mrm.1910030611.Peer-Reviewed Original Research
1984
Homonuclear 1H double-resonance difference spectroscopy of the rat brain in vivo.
Rothman D, Behar K, Hetherington H, Shulman R. Homonuclear 1H double-resonance difference spectroscopy of the rat brain in vivo. Proceedings Of The National Academy Of Sciences Of The United States Of America 1984, 81: 6330-6334. PMID: 6149543, PMCID: PMC391917, DOI: 10.1073/pnas.81.20.6330.Peer-Reviewed Original Research
1983
Cerebral metabolic studies in vivo by 31P NMR.
Prichard J, Alger J, Behar K, Petroff O, Shulman R. Cerebral metabolic studies in vivo by 31P NMR. Proceedings Of The National Academy Of Sciences Of The United States Of America 1983, 80: 2748-2751. PMID: 6573678, PMCID: PMC393905, DOI: 10.1073/pnas.80.9.2748.Peer-Reviewed Original ResearchConceptsStatus epilepticusCerebral metabolic studiesNitrous oxide analgesiaHypoxic hypoxiaMetabolic disturbancesCardiovascular functionInsulin shockEpilepticusHypoglycemiaLiving rabbitsCreatine kinaseMetabolic stressPhosphocreatine storesHypoxiaMetabolic studiesADP levelsATP levelsReversible decreaseSimilar changesPhosphocreatine poolBrainPhysiological variablesSurface coilAnalgesia