2018
Brain serotonin synthesis capacity in obsessive-compulsive disorder: effects of cognitive behavioral therapy and sertraline
Lissemore J, Sookman D, Gravel P, Berney A, Barsoum A, Diksic M, Nordahl T, Pinard G, Sibon I, Cottraux J, Leyton M, Benkelfat C. Brain serotonin synthesis capacity in obsessive-compulsive disorder: effects of cognitive behavioral therapy and sertraline. Translational Psychiatry 2018, 8: 82. PMID: 29666372, PMCID: PMC5904107, DOI: 10.1038/s41398-018-0128-4.Peer-Reviewed Original ResearchConceptsSerotonin synthesis capacitySelective serotonin reuptake inhibitorsCognitive behavioral therapyObsessive-compulsive disorderPartial respondersTreatment modalitiesMedication-free OCD patientsBehavioral therapyOCD patientsSerotonin reuptake inhibitorsWeeks of treatmentRegional tracer uptakePost-treatment changesPositron emission tomographySynthesis capacityClinical improvementSSRI treatmentReuptake inhibitorsSertraline treatmentSymptom improvementRaphe nucleusNeurochemical changesSerotonergic toneSymptom responseEffective treatment
2017
Quantification of brain cholinergic denervation in Alzheimer’s disease using PET imaging with [18F]-FEOBV
Aghourian M, Legault-Denis C, Soucy J, Rosa-Neto P, Gauthier S, Kostikov A, Gravel P, Bédard M. Quantification of brain cholinergic denervation in Alzheimer’s disease using PET imaging with [18F]-FEOBV. Molecular Psychiatry 2017, 22: 1531-1538. PMID: 28894304, DOI: 10.1038/mp.2017.183.Peer-Reviewed Original ResearchMeSH KeywordsAgedAged, 80 and overAlzheimer DiseaseAmyloid beta-PeptidesBrainCase-Control StudiesCholinergic AgentsCholinergic NeuronsFemaleFluorodeoxyglucose F18HumansMaleMiddle AgedPiperidinesPositron-Emission TomographyPresynaptic TerminalsRadioactive TracersVesicular Acetylcholine Transport ProteinsConceptsMini-Mental State ExaminationStandardized uptake value ratioAlzheimer's diseaseCortical areasPresynaptic cholinergic nerve terminalsAmyloid-beta tracerNumerous cortical areasCognitive scalesCholinergic nerve terminalsUptake value ratioVesicular acetylcholine transporterMultiple cortical areasNew PET radiotracersVoxel-wise t-testsCholinergic denervationCholinergic terminalsCholinergic degenerationControl subjectsAD patientsCholinergic lossNerve terminalsAD groupHealthy subjectsAcetylcholine transporterAD subjectsPosterior dopamine D2/3 receptors and brain network functional connectivity
Nagano‐Saito A, Lissemore J, Gravel P, Leyton M, Carbonell F, Benkelfat C. Posterior dopamine D2/3 receptors and brain network functional connectivity. Synapse 2017, 71 PMID: 28700819, DOI: 10.1002/syn.21993.Peer-Reviewed Original ResearchConceptsDefault mode networkNetwork functional connectivityFunctional connectivity strengthPositron emission tomographyFunctional connectivityPosterior portionReceptor distributionPosteromedial cortexResting-state functional magnetic resonance imagingConnectivity strengthBrain network functional connectivityPosterior default mode networkMode networkDopamine D2/3 receptorsDopamine receptor distributionResting-state connectivityBrain networksFunctional magnetic resonance imagingMagnetic resonance imagingMultiple brain networksFallypride bindingDorsal attention networkMean BPBrain dopamineD2/3 receptors
2014
Brain serotonin synthesis in MDMA (ecstasy) polydrug users: an alpha‐[11C]methyl‐l‐tryptophan study
Booij L, Soucy J, Young S, Regoli M, Gravel P, Diksic M, Leyton M, Pihl R, Benkelfat C. Brain serotonin synthesis in MDMA (ecstasy) polydrug users: an alpha‐[11C]methyl‐l‐tryptophan study. Journal Of Neurochemistry 2014, 131: 634-644. PMID: 25041501, DOI: 10.1111/jnc.12826.Peer-Reviewed Original ResearchConceptsMDMA polydrug usersMDMA usePolydrug usersLong-term neurotoxic effectsBrain serotonin synthesisSerotonin synthesis capacityDistal brain regionsNeurotoxicity of MDMAPositron emission tomographySynthesis capacityTracer alphaSerotonin synthesisNeurotoxic effectsPre-frontal regionsTemporal areaBrain regionsEmission tomographyCompensatory mechanismsTryptophan studiesParietal regionsMethylenedioxymethamphetamine (MDMA) useLonger durationBrainstemMDMA users
2013
Grey matter density and GABAA binding potential show a positive linear relationship across cortical regions
Duncan N, Gravel P, Wiebking C, Reader A, Northoff G. Grey matter density and GABAA binding potential show a positive linear relationship across cortical regions. Neuroscience 2013, 235: 226-231. PMID: 23380503, DOI: 10.1016/j.neuroscience.2012.12.075.Peer-Reviewed Original Research
2012
External awareness and GABA—A multimodal imaging study combining fMRI and [18F]flumazenil‐PET
Wiebking C, Duncan N, Qin P, Hayes D, Lyttelton O, Gravel P, Verhaeghe J, Kostikov A, Schirrmacher R, Reader A, Bajbouj M, Northoff G. External awareness and GABA—A multimodal imaging study combining fMRI and [18F]flumazenil‐PET. Human Brain Mapping 2012, 35: 173-184. PMID: 22996793, PMCID: PMC6869063, DOI: 10.1002/hbm.22166.Peer-Reviewed Original ResearchConceptsNeuronal activity changesInhibitory neurotransmitter GABANegative BOLD responseFunctional magnetic resonance imaging paradigmCortical midline regionsSame healthy subjectsGABAA receptorsHealthy subjectsNeurotransmitter GABAPsychiatric disordersBiochemical mechanismsPET imagingExtrinsic systemMidline regionBOLD responseExternal awarenessNeuronal networksUnderlying neuronal networksImaging paradigmGABAActivity changesStimulus typeSame paradigmAwarenessPrecuneusPerinatal effects on in vivo measures of human brain serotonin synthesis in adulthood: A 27-year longitudinal study
Booij L, Benkelfat C, Leyton M, Vitaro F, Gravel P, Lévesque M, Arseneault L, Diksic M, Tremblay R. Perinatal effects on in vivo measures of human brain serotonin synthesis in adulthood: A 27-year longitudinal study. European Neuropsychopharmacology 2012, 22: 419-423. PMID: 22257439, DOI: 10.1016/j.euroneuro.2011.11.002.Peer-Reviewed Original ResearchConceptsMedial orbitofrontal cortexOrbitofrontal cortexSerotonin neurotransmissionPerinatal adversityPositron emission tomography scanEarly postnatal stressorsLow birth weightEmission tomography scanBrain serotonin neurotransmissionBrain serotonin synthesisSerotonin synthesis capacityStudies reporting associationLongitudinal studyMental health problemsEffects of childhoodLife-long impactTracer alphaMaternal smokingPerinatal effectsBirth complicationsBirth weightRisk factorsTomography scanSerotonin pathwaySerotonin synthesis
2011
Brain Regionalα-[11C]Methyl-L-Tryptophan Trapping in Medication-Free Patients With Obsessive-Compulsive Disorder
Berney A, Leyton M, Gravel P, Sibon I, Sookman D, Neto P, Diksic M, Nakai A, Pinard G, Todorov C, Okazawa H, Blier P, Nordahl T, Benkelfat C. Brain Regionalα-[11C]Methyl-L-Tryptophan Trapping in Medication-Free Patients With Obsessive-Compulsive Disorder. JAMA Psychiatry 2011, 68: 732-741. PMID: 21383250, PMCID: PMC3677917, DOI: 10.1001/archgenpsychiatry.2011.16.Peer-Reviewed Original ResearchConceptsL-tryptophan trappingObsessive-compulsive disorderMedication-free patientsHealthy controlsMcGill University Health CentreGlucose metabolic disturbancesAdults meeting criteriaMain outcome measuresUniversity Health CentrePositron emission tomographyDepartment of PsychiatryStatistical parametric mappingTemporal lobe activityMontreal Neurological InstituteSerotonergic componentReuptake inhibitorsSerotonin dysfunctionClinical efficacySerotonergic abnormalitiesMetabolic disturbancesPostsynaptic changesSymptomatic stateSerotonergic systemHealth centersOutcome measures
2010
Task-oriented quantitative image reconstruction in emission tomography for single- and multi-subject studies
Verhaeghe J, Gravel P, Reader A. Task-oriented quantitative image reconstruction in emission tomography for single- and multi-subject studies. Physics In Medicine And Biology 2010, 55: 7263-7285. PMID: 21081825, DOI: 10.1088/0031-9155/55/23/006.Peer-Reviewed Original ResearchMotion compensation for fully 4D PET reconstruction using PET superset data
Verhaeghe J, Gravel P, Mio R, Fukasawa R, Rosa-Neto P, Soucy J, Thompson C, Reader A. Motion compensation for fully 4D PET reconstruction using PET superset data. Physics In Medicine And Biology 2010, 55: 4063-4082. PMID: 20601774, DOI: 10.1088/0031-9155/55/14/008.Peer-Reviewed Original ResearchConceptsSubject head motionPET reconstructionPET image reconstructionHead motionImage reconstruction algorithmMotion compensation methodImage framesOptical tracking systemMotion compensationList-mode eventsImage reconstructionTracking systemReconstruction algorithmSingle instanceMotion compensation strategyAlgorithmMultiple time framesReconstruction methodNormalization schemeImportant issuePET dataBasis functionsDynamic PET imagingHead movementsParametric imagesBrain Serotonin Synthesis in Adult Males Characterized by Physical Aggression during Childhood: A 21-Year Longitudinal Study
Booij L, Tremblay R, Leyton M, Séguin J, Vitaro F, Gravel P, Perreau-Linck E, Lévesque M, Durand F, Diksic M, Turecki G, Benkelfat C. Brain Serotonin Synthesis in Adult Males Characterized by Physical Aggression during Childhood: A 21-Year Longitudinal Study. PLOS ONE 2010, 5: e11255. PMID: 20582306, PMCID: PMC2889822, DOI: 10.1371/journal.pone.0011255.Peer-Reviewed Original ResearchConceptsPhysical aggressionLongitudinal studyHigher physical aggressionLow serotonin neurotransmissionImpulsive aggressive behaviorSubstance abuse disordersEmotional intelligenceComputerized measuresVulnerability traitsVulnerability factorsOrbitofrontal cortexEnvironmental supportGroup differencesAggressionAbuse disordersAggressive behaviorTracer alphaMultiple indicesPlasma tryptophan levelsBrain serotonin synthesisLow trappingPositron emission tomographyCurrent behaviorSerotonin neurotransmissionImpulsivity
2008
MicroPET imaging of 5-HT1A receptors in rat brain: a test–retest [18F]MPPF study
Aznavour N, Benkelfat C, Gravel P, Aliaga A, Rosa-Neto P, Bedell B, Zimmer L, Descarries L. MicroPET imaging of 5-HT1A receptors in rat brain: a test–retest [18F]MPPF study. European Journal Of Nuclear Medicine And Molecular Imaging 2008, 36: 53. PMID: 18704404, DOI: 10.1007/s00259-008-0891-1.Peer-Reviewed Original ResearchConceptsPositron emission tomographyRaphe nucleusIsoflurane-anaesthetised ratsParaventricular hypothalamic nucleusMedial prefrontal cortexTest-retest variabilityNon-human primatesSimplified reference tissue modelReference tissue modelHypothalamic nucleiRaphe obscurusMagnetic resonance imaging dataBasolateral amygdaloidRat brainLarge brain regionsParaventricular hypothalamicBrain regionsEmission tomographyReceptor functionPrefrontal cortexMicroPET imagingBrain imagingRatsPotential of serotoninReceptorsDecreased [18F]MPPF Binding Potential in the Dorsal Raphe Nucleus After a Single Oral Dose of Fluoxetine: A Positron-Emission Tomography Study in Healthy Volunteers
Sibon I, Benkelfat C, Gravel P, Aznavour N, Costes N, Mzengeza S, Booij L, Baker G, Soucy J, Zimmer L, Descarries L. Decreased [18F]MPPF Binding Potential in the Dorsal Raphe Nucleus After a Single Oral Dose of Fluoxetine: A Positron-Emission Tomography Study in Healthy Volunteers. Biological Psychiatry 2008, 63: 1135-1140. PMID: 18191817, DOI: 10.1016/j.biopsych.2007.11.016.Peer-Reviewed Original ResearchMeSH KeywordsAdministration, OralAdultAntidepressive Agents, Second-GenerationAutoreceptorsBrainDouble-Blind MethodFluorine RadioisotopesFluoxetineHumansImage Processing, Computer-AssistedMagnetic Resonance ImagingMalePiperazinesPositron-Emission TomographyPyridinesRaphe NucleiReceptor, Serotonin, 5-HT1AReference Values
2007
In vivo measurements of brain trapping of C-labelled alpha-methyl-L-tryptophan during acute changes in mood states.
Perreau-Linck E, Beauregard M, Gravel P, Paquette V, Soucy J, Diksic M, Benkelfat C. In vivo measurements of brain trapping of C-labelled alpha-methyl-L-tryptophan during acute changes in mood states. Journal Of Psychiatry And Neuroscience 2007, 32: 430-4. PMID: 18043767, PMCID: PMC2077345.Peer-Reviewed Original ResearchConceptsPositron emission tomographyBrain trappingEmotional statesRight anterior cingulate cortexNeutral emotional stateNeurobiology of emotionAnterior cingulate cortexWhole-brain analysisSubjects repeated-measures designState-related changesAcute changesL-tryptophanAutobiographical memoryRepeated-measures designHealthy peopleCingulate cortexBrain Imaging CenterEmission tomographyMood statesMcConnell Brain Imaging CentreBrain analysisNormal moodExperienced levelScan acquisitionSustained changes
2006
Assessing whole brain perfusion changes in patients with REM sleep behavior disorder
Mazza S, Soucy J, Gravel P, Michaud M, Postuma R, Massicotte-Marquez J, Decary A, Montplaisir J. Assessing whole brain perfusion changes in patients with REM sleep behavior disorder. Neurology 2006, 67: 1618-1622. PMID: 17101893, DOI: 10.1212/01.wnl.0000242879.39415.49.Peer-Reviewed Original ResearchMeSH KeywordsAgedBrainBrain StemCerebral ArteriesCerebral CortexCerebrovascular CirculationCorpus StriatumCysteineFemaleHumansMaleMiddle AgedNeurodegenerative DiseasesOrganotechnetium CompoundsParkinson DiseasePolysomnographyPredictive Value of TestsPrognosisREM Sleep Behavior DisorderTomography, Emission-Computed, Single-PhotonConceptsREM behavior disorderBehavior disorderCerebral blood flow evaluationREM sleep behavior disorderIdiopathic REM behavior disorderSleep behavior disorderBrain perfusion changesRegional cerebral perfusionBlood flow evaluationAge-matched controlsTemporo-parietal cortexCerebral perfusionDecreased perfusionPerfusion changesPerfusional abnormalitiesRight hippocampusParkinson's diseasePatientsMetabolic profilePerfusionDisordersAbnormalitiesCortexFlow evaluationBrainstem