2021
Assessment of transient dopamine responses to smoked cannabis
Calakos KC, Liu H, Lu Y, Anderson JM, Matuskey D, Nabulsi N, Ye Y, Skosnik PD, D'Souza DC, Morris ED, Cosgrove KP, Hillmer AT. Assessment of transient dopamine responses to smoked cannabis. Drug And Alcohol Dependence 2021, 227: 108920. PMID: 34399137, PMCID: PMC8464527, DOI: 10.1016/j.drugalcdep.2021.108920.Peer-Reviewed Original ResearchConceptsStriatal dopamine responsesDopamine responseRadiotracer uptakePositron emission tomography (PET) imaging studiesTransient reductionTomography Imaging StudyChronic cannabis useDopaminergic mechanismsCannabis smokingMesolimbic dopaminergicReceptor antagonistPlasma concentrationsRegular cannabis usersCannabis cigarettesConstant infusionDopamine DImaging studiesVentral striatumCannabis useTransient changesCannabis usersCannabisPuff protocolPreliminary dataTHC levelsPET Imaging Estimates of Regional Acetylcholine Concentration Variation in Living Human Brain
Smart K, Naganawa M, Baldassarri SR, Nabulsi N, Ropchan J, Najafzadeh S, Gao H, Navarro A, Barth V, Esterlis I, Cosgrove KP, Huang Y, Carson RE, Hillmer AT. PET Imaging Estimates of Regional Acetylcholine Concentration Variation in Living Human Brain. Cerebral Cortex 2021, 31: 2787-2798. PMID: 33442731, PMCID: PMC8355478, DOI: 10.1093/cercor/bhaa387.Peer-Reviewed Original ResearchConceptsACh concentrationHuman volunteersHigh ACh concentrationsMuscarinic antagonist scopolamineHealthy human volunteersHuman brainCholinergic receptorsNicotine challengeAntagonist scopolaminePreclinical studiesStriatal regionsPET scansEndogenous neurotransmittersNeuropsychiatric diseasesNonhuman primatesWhole-brain imagesDrug occupancyNicotinic ligandsClinical populationsBrainAcetylcholineDistinct functional rolesStriatumVolunteersFunctional role
2020
PTSD is associated with neuroimmune suppression: evidence from PET imaging and postmortem transcriptomic studies
Bhatt S, Hillmer AT, Girgenti MJ, Rusowicz A, Kapinos M, Nabulsi N, Huang Y, Matuskey D, Angarita GA, Esterlis I, Davis MT, Southwick SM, Friedman MJ, Duman R, Carson R, Krystal J, Pietrzak R, Cosgrove K. PTSD is associated with neuroimmune suppression: evidence from PET imaging and postmortem transcriptomic studies. Nature Communications 2020, 11: 2360. PMID: 32398677, PMCID: PMC7217830, DOI: 10.1038/s41467-020-15930-5.Peer-Reviewed Original ResearchMeSH KeywordsAcetamidesAdaptor Proteins, Signal TransducingAdultBrainCase-Control StudiesFemaleGene Expression ProfilingHealthy VolunteersHumansMaleMicrogliaMiddle AgedPositron-Emission TomographyPyridinesRadiopharmaceuticalsReceptors, GABAReceptors, Tumor Necrosis Factor, Member 14Sex FactorsStress Disorders, Post-TraumaticYoung AdultConceptsPosttraumatic stress disorderPeripheral immune activationImmune activationHigher C-reactive protein levelsC-reactive protein levelsTSPO availabilityTranslocator proteinBrain microglial activationTomography brain imagingStress-related pathophysiologyPositron emission tomography (PET) brain imagingNeuroimmune activationMicroglial activationPTSD symptom severityImmunologic regulationPostmortem studiesPTSD subgroupHealthy individualsSymptom severityTrauma exposurePTSD groupStress disorderLower relative expressionBrain imagingPET imagingTobacco Smoking in People Is Not Associated with Altered 18-kDa Translocator Protein Levels: A PET Study
Hillmer AT, Matuskey D, Huang Y, Nabulsi N, Ropchan J, Carson RE, O'Malley SS, Cosgrove KP. Tobacco Smoking in People Is Not Associated with Altered 18-kDa Translocator Protein Levels: A PET Study. Journal Of Nuclear Medicine 2020, 61: 1200-1204. PMID: 32005773, PMCID: PMC7413239, DOI: 10.2967/jnumed.119.237735.Peer-Reviewed Original ResearchMeSH KeywordsAdultFemaleHumansMaleMiddle AgedPositron-Emission TomographyReceptors, GABATobacco SmokingYoung AdultConceptsTobacco smokingTobacco smokersTSPO levelsImmune systemPET studiesBrain immune systemBrain TSPO levelsPrimary immunocompetent cellsPrevious PET studiesTranslocator proteinTranslocator protein (TSPO) levelsInflammatory effectsImmunocompetent cellsArterial bloodTobacco smokePET scansNonsmokersSmokersRadiotracer concentrationMedium effect sizeSmokingPET imagingBrainProtein levelsSignificant differences
2017
The Effect of Treatment with Guanfacine, an Alpha2 Adrenergic Agonist, on Dopaminergic Tone in Tobacco Smokers: An [11C]FLB457 PET Study
Sandiego CM, Matuskey D, Lavery M, McGovern E, Huang Y, Nabulsi N, Ropchan J, Picciotto MR, Morris ED, McKee SA, Cosgrove KP. The Effect of Treatment with Guanfacine, an Alpha2 Adrenergic Agonist, on Dopaminergic Tone in Tobacco Smokers: An [11C]FLB457 PET Study. Neuropsychopharmacology 2017, 43: 1052-1058. PMID: 28944773, PMCID: PMC5854798, DOI: 10.1038/npp.2017.223.Peer-Reviewed Original ResearchConceptsTobacco smokersGuanfacine treatmentPositron emission tomographyTobacco smokingDA releaseDopaminergic toneDopamine releaseAmphetamine-induced DA releaseTobacco smoking cessationCortical dopamine releaseExtrastriatal brain regionsAlpha2-adrenergic agonistExtrastriatal dopamine releaseEffect of treatmentBaseline BPNDSmoking cessationReceptor radiotracerAdrenergic agonistsPET scansAnimal modelsBrain regionsEmission tomographyPET studiesDopamine signalingSmokers
2015
Imaging robust microglial activation after lipopolysaccharide administration in humans with PET
Sandiego CM, Gallezot JD, Pittman B, Nabulsi N, Lim K, Lin SF, Matuskey D, Lee JY, O’Connor K, Huang Y, Carson RE, Hannestad J, Cosgrove KP. Imaging robust microglial activation after lipopolysaccharide administration in humans with PET. Proceedings Of The National Academy Of Sciences Of The United States Of America 2015, 112: 12468-12473. PMID: 26385967, PMCID: PMC4603509, DOI: 10.1073/pnas.1511003112.Peer-Reviewed Original ResearchConceptsMicroglial activationBrain microglial activationLPS administrationInflammatory cytokinesLPS challengeRobust microglial activationSystemic LPS challengeActivation of microgliaInnate immune cellsVital sign changesHealthy male subjectsEscherichia coli lipopolysaccharidePositron emission tomography (PET) radiotracerNeuroinflammatory responseSystemic inflammationLipopolysaccharide administrationAntiinflammatory effectsBlood levelsImmune cellsNew medicationsSystemic administrationColi lipopolysaccharidePET scansPsychiatric diseasesMale subjects
2014
Sex Differences in the Brain's Dopamine Signature of Cigarette Smoking
Cosgrove KP, Wang S, Kim SJ, McGovern E, Nabulsi N, Gao H, Labaree D, Tagare HD, Sullivan JM, Morris ED. Sex Differences in the Brain's Dopamine Signature of Cigarette Smoking. Journal Of Neuroscience 2014, 34: 16851-16855. PMID: 25505336, PMCID: PMC4261105, DOI: 10.1523/jneurosci.3661-14.2014.Peer-Reviewed Original ResearchConceptsCigarette smokingVentral striatumCigarette smoking differsEffect of smokingEarly PET studiesMesolimbic dopamine systemRight ventral striatumSex differencesDopaminergic eventsMale smokersNicotine patchCessation treatmentFemale smokersDorsal putamenDopaminergic responseBrain scanningSmoking differsDrug effectsDopamine systemSmokingNeurotransmitter releasePublic health dangerPET studiesCue reactivityWomen