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Rosell DR, Slifstein M, Thompson J, Xu X, Perez-Rodriguez MM, McClure MM, Hazlett EA, New AS, Nabulsi N, Huang Y, Carson RE, Siever LS, Abi-Dargham A, Koenigsberg HW. Serotonin transporter availability in physically aggressive personality disordered patients: associations with trait and state aggression, and response to fluoxetine. Psychopharmacology (Berl) 2023; 240:361-71. [PMID: 36640190 DOI: 10.1007/s00213-022-06306-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 12/27/2022] [Indexed: 01/15/2023]
Abstract
RATIONALE Characterizing the neuroanatomical basis of serotonergic abnormalities in severe, chronic, impulsive aggression will allow for rational treatment selection, development of novel therapeutics, and biomarkers to identify at-risk individuals. OBJECTIVES The aim of this study is to identify associations between regional serotonin transporter (5-HTT) availability and trait and state aggression, as well as response to the anti-aggressive effects of fluoxetine. METHODS We examined 5-HTT availability using positron emission tomography (PET) imaging with [11C]DASB in personality disordered patients with current physical intermittent explosive disorder (IED; n = 18), and healthy comparison participants (HC; n = 11), in the anterior cingulate cortex (ACC), amygdala (AMY), ventral striatum (VST), and midbrain (MID). After PET imaging, IED patients were treated with fluoxetine 20 mg daily (n = 9) or placebo (n = 6) for 12 weeks. Trait and state aggression, trait callousness, and childhood trauma were assessed. RESULTS In IED patients, trait aggression was positively associated with [11C]DASB binding in the ACC and VST; covarying for trait callousness and childhood trauma enhanced these correlations. Baseline state aggression was positively correlated with ACC [11C]DASB in IED patients. Greater baseline VST [11C]DASB binding predicted greater decreases in state aggression with fluoxetine treatment. CONCLUSIONS Consistent with prior reports, ACC 5-HTT is related to trait aggression, and adjusting for factors related to proactive (callousness) and reactive (childhood trauma) aggression subtypes further resolves this relationship. Novel findings of the study include a better understanding of the association between regional 5-HTT availability and state aggression, and the involvement of VST 5-HTT with trait aggression, and with the anti-aggressive effects of fluoxetine.
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Metaxas A, Anzalone M, Vaitheeswaran R, Petersen S, Landau AM, Finsen B. Neuroinflammation and amyloid-beta 40 are associated with reduced serotonin transporter (SERT) activity in a transgenic model of familial Alzheimer's disease. Alzheimers Res Ther 2019; 11:38. [PMID: 31043179 PMCID: PMC6495598 DOI: 10.1186/s13195-019-0491-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 04/04/2019] [Indexed: 12/18/2022]
Abstract
Background Discrepant and often contradictory results have accumulated regarding the antidepressant and pro-cognitive effects of serotonin transporter (SERT) antagonists in Alzheimer’s disease. Methods To address the discrepancy, we measured the activity and density of SERT in the neocortex of 3–24-month-old APPswe/PS1dE9 and wild-type littermate mice, by using [3H]DASB autoradiography and the [3H]5-HT uptake assay. Levels of soluble amyloid-β (Aβ), and pro-inflammatory cytokines that can regulate SERT function, such as interleukin-1β (IL-1β), interleukin-6 (IL-6), and tumor necrosis factor (TNF), were measured in parallel. Neuroinflammation in aging APPswe/PS1dE9 mice was further evaluated by [3H]PK11195 autoradiography. Results Decreased SERT density was observed in the parietal and frontal cortex of 18–24-month-old APPswe/PS1dE9 mice, compared to age-matched, wild-type animals. The maximal velocity uptake rate (Vmax) of [3H]5-HT was reduced in neocortical preparations from 20-month-old transgenic vs. wild-type mice. The reduction was observed when the proportion of soluble Aβ40 in the Aβ40/42 ratio increased in the aged transgenic brain. At concentrations compatible with those measured in 20-month-old APPswe/PS1dE9 mice, synthetic human Aβ40, but not Aβ42, reduced the baseline Vmax of [3H]5-HT by ~ 20%. Neuroinflammation in APPswe/PS1dE9 vs. wild-type mice was evidenced by elevated [3H]PK11195 binding levels and increased concentration of IL-1β protein, which preceded the reductions in neocortical SERT density and activity. Age-induced increases in the levels of IL-1β, IL-6, and TNF were observed in both transgenic and wild-type animals. Conclusions The progression of cerebral amyloidosis is associated with neuroinflammation and decreased presynaptic markers of serotonergic integrity and activity. The Aβ40-induced reduction in the uptake kinetics of [3H]5-HT suggests that the activity of SERT, and potentially the effects of SERT antagonism, depend on the levels of interstitial Aβ40.
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Affiliation(s)
- Athanasios Metaxas
- Department of Neurobiology, Institute of Molecular Medicine, University of Southern Denmark, J.B. Winsløws Vej 25, DK-5000, Odense C, Denmark.
| | - Marco Anzalone
- Department of Neurobiology, Institute of Molecular Medicine, University of Southern Denmark, J.B. Winsløws Vej 25, DK-5000, Odense C, Denmark
| | - Ramanan Vaitheeswaran
- Department of Neurobiology, Institute of Molecular Medicine, University of Southern Denmark, J.B. Winsløws Vej 25, DK-5000, Odense C, Denmark
| | - Sussanne Petersen
- Department of Neurobiology, Institute of Molecular Medicine, University of Southern Denmark, J.B. Winsløws Vej 25, DK-5000, Odense C, Denmark
| | - Anne M Landau
- Department of Nuclear Medicine & PET Center, Aarhus University and Hospital, Nørrebrogade 44, Building 10G, DK-8000, Aarhus, Denmark.,Translational Neuropsychiatry Unit, Department of Clinical Medicine, Aarhus University, Skovagervej 2, DK-8240, Risskov, Denmark
| | - Bente Finsen
- Department of Neurobiology, Institute of Molecular Medicine, University of Southern Denmark, J.B. Winsløws Vej 25, DK-5000, Odense C, Denmark
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Hvilsom AST, Lillethorup TP, Iversen P, Doudet DJ, Wegener G, Landau AM. Cortical and striatal serotonin transporter binding in a genetic rat model of depression and in response to electroconvulsive stimuli. Eur Neuropsychopharmacol 2019; 29:493-500. [PMID: 30826156 DOI: 10.1016/j.euroneuro.2019.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 01/10/2019] [Accepted: 02/14/2019] [Indexed: 10/27/2022]
Abstract
Depression is a debilitating mental illness and two thirds of patients respond insufficiently to conventional antidepressants. Electroconvulsive therapy (ECT) remains the most effective treatment to alleviate drug-refractory depression, however the neurobiological mechanisms are mostly unknown. The serotonergic system plays an important role in depression and alterations in the serotonin transporter (SERT) are seen both in depression and response to antidepressant pharmacotherapies. The first aim of this study was to investigate SERT density in a genetic rat model of depression, Flinders Sensitive Line (FSL), compared to control Flinders Resistant Line (FRL) and Sprague-Dawley (SD) rats. The second aim was to investigate SERT density in response to electroconvulsive stimuli (ECS), an animal model of ECT. Female rats of each strain were treated with ECS or sham (ear-clip placement with no current) for 10 days before brains were removed, frozen and cut into 20 µm thick sections. SERT density was measured in striatal and cortical regions by quantitative in vitro autoradiography using the SERT-radioligand, [3H]-DASB. Higher SERT density was observed in FSL rats compared to SD rats by 36-48% in motor cortex and striatum under sham conditions. In response to ECS, SD rats displayed a significant effect of treatment, whereas no changes were observed in FRL and FSL rats. Increased SERT binding in FSL rats compared to SD supports a dysfunction of the serotonergic system in depression. The increased SERT density after ECS, seen in SD rats but not FSL rats, suggests a different mechanism of action between depressive-like rats and controls.
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Affiliation(s)
- Anna Sophie Thue Hvilsom
- Translational Neuropsychiatry Unit, Aarhus University, Denmark; Department of Nuclear Medicine and PET Center, Aarhus University, Nørrebrogade 44, Building 10G, 8000 Aarhus C, Denmark
| | - Thea P Lillethorup
- Department of Nuclear Medicine and PET Center, Aarhus University, Nørrebrogade 44, Building 10G, 8000 Aarhus C, Denmark
| | - Peter Iversen
- Department of Nuclear Medicine and PET Center, Aarhus University, Nørrebrogade 44, Building 10G, 8000 Aarhus C, Denmark
| | - Doris J Doudet
- Department of Nuclear Medicine and PET Center, Aarhus University, Nørrebrogade 44, Building 10G, 8000 Aarhus C, Denmark; Department of Medicine/Neurology, University of British Columbia, Canada
| | - Gregers Wegener
- Translational Neuropsychiatry Unit, Aarhus University, Denmark; Centre for Pharmaceutical Excellence, School of Pharmacy (Pharmacology), North-West University, Potchefstroom, South Africa
| | - Anne M Landau
- Translational Neuropsychiatry Unit, Aarhus University, Denmark; Department of Nuclear Medicine and PET Center, Aarhus University, Nørrebrogade 44, Building 10G, 8000 Aarhus C, Denmark.
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Wilson H, Giordano B, Turkheimer FE, Chaudhuri KR, Politis M. Serotonergic dysregulation is linked to sleep problems in Parkinson's disease. Neuroimage Clin 2018; 18:630-637. [PMID: 29845011 PMCID: PMC5964830 DOI: 10.1016/j.nicl.2018.03.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 02/22/2018] [Accepted: 03/01/2018] [Indexed: 02/03/2023]
Abstract
Introduction Sleep disturbances are common non-motor symptoms in Parkinson's disease (PD). Experimental studies suggest involvement of the serotonergic system in the regulation of sleep and arousal. Using [11C]DASB positron emission tomography, a marker of serotonin transporter availability, we investigated whether sleep dysfunction is associated with serotonergic dysfunction in PD. Methods We studied 14 PD patients with sleep dysfunction, 14 PD without sleep dysfunction, and 12 healthy controls. Groups were matched for age, disease duration, severity of motor symptoms, daily intake of levodopa equivalent units, body-mass-index, depression and fatigue. [11C]DASB non-displaceable binding potential (BPND) was calculated for regions with a role in the regulation of sleep and arousal. Results [11C]DASB BPND was reduced by 32–49% in PD patients with sleep dysfunction, and 14–25% in PD without sleep dysfunction, compared to healthy controls. PD patients with sleep dysfunction had lower [11C]DASB BPND in caudate (P < 0.01), putamen (P < 0.001), ventral striatum (P < 0.001), thalamus (P < 0.05), hypothalamus (P < 0.001) and raphe nuclei (P < 0.01), compared to PD without sleep dysfunction. Higher severity of sleep symptoms (assessed with Parkinson Disease Sleep Scale) correlated with lower [11C]DASB binding in caudate (r = 0.77; P < 0.001), putamen (r = 0.84; P < 0.001), ventral striatum (r = 0.86; P < 0.001), thalamus (r = 0.79; P < 0.001), hypothalamus (r = 0.90; P < 0.001) and raphe nuclei (r = 0.83; P < 0.001). Conclusions Our findings demonstrate that sleep dysfunction in PD is associated with reduced serotonergic function in the midbrain raphe, basal ganglia and hypothalamus. Strategies to increase serotonin levels in the brain could be a promising approach to treat sleep dysfunction in PD, and may also have relevance in other neurodegenerative disorders. Reduced PET [11C]DASB binding in Parkinson patients with sleep disturbances PD with sleep disturbances shows loss of serotonin in the striatum, raphe and hypothalamus. Loss of serotonin correlated with severity of sleep symptoms in PD patients. Serotonergic dysfunction could contribute to pathophysiology of sleep disturbances.
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Affiliation(s)
- Heather Wilson
- Neurodegeneration Imaging Group, Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience (IoPPN), King's College London, London, UK
| | - Beniamino Giordano
- Neurodegeneration Imaging Group, Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience (IoPPN), King's College London, London, UK
| | - Federico E Turkheimer
- Division of Brain Sciences, Imperial College London, Hammersmith Hospital, London, UK; Department of Neuroimaging, Institute of Psychiatry, King's College London, London, UK
| | - Kallol Ray Chaudhuri
- Parkinson's Centre of Excellence, Department of Neurology, King's College Hospital Foundation Trust, UK
| | - Marios Politis
- Neurodegeneration Imaging Group, Department of Basic and Clinical Neuroscience, Institute of Psychiatry, Psychology and Neuroscience (IoPPN), King's College London, London, UK.
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Smit M, Vállez García D, de Jong BM, Zoons E, Booij J, Dierckx RA, Willemsen AT, de Vries EF, Bartels AL, Tijssen MA. Relationships between Serotonin Transporter Binding in the Raphe Nuclei, Basal Ganglia, and Hippocampus with Clinical Symptoms in Cervical Dystonia: A [ 11C] DASB Positron Emission Tomography Study. Front Neurol 2018. [PMID: 29541052 PMCID: PMC5835525 DOI: 10.3389/fneur.2018.00088] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Purpose Alterations of the central serotonergic system have been implicated in the pathophysiology of dystonia. In this molecular imaging study, we assessed whether altered presynaptic serotonin transporter (SERT) binding contributes to the pathophysiology of cervical dystonia (CD), concerning both motor and non-motor symptoms (NMS). Methods We assessed the non-displaceable binding potential (BPND) using the selective SERT tracer [11C]DASB and positron emission tomography (PET) in 14 CD patients and 12 age- and gender-matched controls. Severity of motor symptoms was scored using the Toronto Western Spasmodic Torticollis Rating Scale and Clinical Global Impression jerks/tremor scale. NMS for depressive symptoms, anxiety, fatigue, and sleep disturbances were assessed with quantitative rating scales. The relationship between SERT binding and clinical patient characteristics was analyzed with the Spearman’s rho test and multiple regression. Results When comparing the CD patients with controls, no significant differences in BPND were found. Higher BPND in the dorsal raphe nucleus was statistically significantly correlated (p < 0.001) with motor symptom severity (rs = 0.65), pain (rs = 0.73), and sleep disturbances (rs = 0.73), with motor symptom severity being the most important predictor of SERT binding. Furthermore, fatigue was negatively associated with the BPND in the medial raphe nucleus (rs = −0.61, p = 0.045), and sleep disorders were positively associated with the BPND in the caudate nucleus (rs = 0.58, p = 0.03) and the hippocampus (rs = 0.56, p = 0.02). Conclusion Motor symptoms, as well as pain, sleep disturbances, and fatigue in CD showed a significant relationship with SERT binding in the raphe nuclei. Moreover, fatigue showed a significant relationship with the medial raphe nucleus and sleep disorders with the caudate nucleus and hippocampus. These findings suggest that an altered serotonergic signaling in different brain areas in CD is related to different motor as well as NMS, which will further stimulate research on the role of serotonin in the pathogenesis of dystonia.
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Affiliation(s)
- Marenka Smit
- Department of Neurology, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands
| | - David Vállez García
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands
| | - Bauke M de Jong
- Department of Neurology, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands
| | - Evelien Zoons
- Department of Neurology, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, Netherlands
| | - Jan Booij
- Department of Nuclear Medicine and Molecular Imaging, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, Netherlands
| | - Rudi A Dierckx
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands
| | - Antoon T Willemsen
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands
| | - Erik F de Vries
- Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands
| | - Anna L Bartels
- Department of Neurology, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands.,Department of Neurology, Ommelander Hospital Group, Groningen, Netherlands
| | - Marina A Tijssen
- Department of Neurology, University Medical Center Groningen (UMCG), University of Groningen, Groningen, Netherlands
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Miller JM, Everett BA, Oquendo MA, Ogden RT, Mann JJ, Parsey RV. Positron emission tomography quantification of serotonin transporter binding in medication-free bipolar disorder. Synapse 2016; 70:24-32. [PMID: 26426356 PMCID: PMC4654655 DOI: 10.1002/syn.21868] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 09/26/2015] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Bipolar disorder (BD) is associated with abnormalities in the serotonin transporter (5-HTT), but specific in vivo findings have been discrepant. Using positron emission tomography (PET) and [(11)C]DASB, we compared 5-HTT binding between unmedicated depressed BD subjects and healthy volunteers (HVs). EXPERIMENTAL DESIGN 5-HTT binding in six brain regions was compared between 17 depressed, unmedicated BD subjects and 31 HVs, using the outcome measure of VT/fP (proportional to the total number of available transporters). Alternative outcome measures were examined as well. 47% of BD were BP I; and 65% reported a prior suicide attempt. PRINCIPAL OBSERVATIONS 5-HTT binding (VT/fP ) did not differ between BD and HV groups considering six brain regions of interest simultaneously (P = 0.24). In contrast, alternative outcome measures (BPF*, BPP*, and BPND*) indicated lower binding in BD compared with HV across these six regions of interest (BPF*: P = 0.047; BPP*: P = 0.032; BPND*: P = 0.031). 5-HTT binding was unrelated to suicide attempt history, depression severity, bipolar subtype, or history of past substance use disorder. CONCLUSIONS Choice of outcome measure strongly affects comparisons of serotonin transporter binding using PET with [(11)C]DASB. We do not find evidence of abnormal 5-HTT binding in bipolar depression using our primary outcome measure, VT /fP . However, we did observe lower 5-HTT binding in BD with alternative outcome measures that are frequently used with [(11)C]DASB. Relative merits and assumptions of different outcome measures are discussed. Evaluation in larger samples and during different mood states, including remission, is warranted.
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Affiliation(s)
- Jeffrey M. Miller
- Division of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, NY
- Department of Psychiatry, Columbia University, New York, NY
| | - Benjamin A. Everett
- Division of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, NY
| | - Maria A. Oquendo
- Division of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, NY
- Department of Psychiatry, Columbia University, New York, NY
| | - R. Todd Ogden
- Division of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, NY
- Department of Biostatistics, Mailman School of Public Health, Columbia University, New York, NY
| | - J. John Mann
- Division of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, NY
- Department of Psychiatry, Columbia University, New York, NY
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Lemoine L, Lieberman BP, Ploessl K, Zheng P, Kung HF. Characterization of FlipIDAM as a SERT-selective SPECT imaging agent. Nucl Med Biol 2013; 40:879-86. [PMID: 23856117 DOI: 10.1016/j.nucmedbio.2013.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 05/23/2013] [Accepted: 06/04/2013] [Indexed: 11/15/2022]
Abstract
INTRODUCTION Biological evaluation of ([(125)I]4), a new single-photon emission computed tomography (SPECT) radioligand for imaging the serotonin transporter (SERT) which displayed improved in vivo kinetics for mapping SERT binding sites in the brain. METHODS In vitro binding studies of [(125)I]4 were performed with membrane homogenates of LLC-PK1 cells stably transfected and overexpressing one of the monoamine transporter (SERT, DAT or NET) and rat cortical homogenates. Biodistribution and ex vivo autoradiography studies were carried out in rats. In vivo competition experiments were evaluated to determine the SERT selectivity of [(125)I]4 vs. ([(125)I]1). RESULTS In vitro binding studies of 4 showed excellent binding affinity (Ki,SERT=0.90 ± 0.05 nM) and excellent selectivity over the other monoamine transporters (100 fold and >4000 fold for NET and DAT respectively). Scatchard analysis of saturation binding of [(125)I]4 to rat cortical homogenates gave a Kd value of 0.5 ± 0.09 nM and a Bmax value of 801.4 ± 58.08 fmol/mg protein. The biodistribution study showed rapid high brain uptake (3.09 ± 0.11% dose/organ at 2 min) and a good target to non-target ratio (hypothalamus to cerebellum) at 30 min (2.62) compared to [(125)I]1 (2.19). Ex vivo autoradiography showed that FlipIDAM localizes in accordance with SERT distribution patterns in the brain. In vivo and ex vivo competition experiments with specific and non-specific SERT compounds also showed that [(125)I]4 binds specifically to SERT rich regions. CONCLUSIONS The biological evaluation of [(125)I]4 demonstrates that [(123)I]4 would be a good candidate for SPECT imaging of SERT.
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Affiliation(s)
- Laetitia Lemoine
- Department of Radiology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104
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