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Al‐Alsheikh AS, Alabdulkader S, Miras AD, Goldstone AP. Effects of bariatric surgery and dietary interventions for obesity on brain neurotransmitter systems and metabolism: A systematic review of positron emission tomography (PET) and single-photon emission computed tomography (SPECT) studies. Obes Rev 2023; 24:e13620. [PMID: 37699864 PMCID: PMC10909448 DOI: 10.1111/obr.13620] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2022] [Revised: 04/05/2023] [Accepted: 07/10/2023] [Indexed: 09/14/2023]
Abstract
This systematic review collates studies of dietary or bariatric surgery interventions for obesity using positron emission tomography and single-photon emission computed tomography. Of 604 publications identified, 22 met inclusion criteria. Twelve studies assessed bariatric surgery (seven gastric bypass, five gastric bypass/sleeve gastrectomy), and ten dietary interventions (six low-calorie diet, three very low-calorie diet, one prolonged fasting). Thirteen studies examined neurotransmitter systems (six used tracers for dopamine DRD2/3 receptors: two each for 11 C-raclopride, 18 F-fallypride, 123 I-IBZM; one for dopamine transporter, 123 I-FP-CIT; one used tracer for serotonin 5-HT2A receptor, 18 F-altanserin; two used tracers for serotonin transporter, 11 C-DASB or 123 I-FP-CIT; two used tracer for μ-opioid receptor, 11 C-carfentanil; one used tracer for noradrenaline transporter, 11 C-MRB); seven studies assessed glucose uptake using 18 F-fluorodeoxyglucose; four studies assessed regional cerebral blood flow using 15 O-H2 O (one study also used arterial spin labeling); and two studies measured fatty acid uptake using 18 F-FTHA and one using 11 C-palmitate. The review summarizes findings and correlations with clinical outcomes, eating behavior, and mechanistic mediators. The small number of studies using each tracer and intervention, lack of dietary intervention control groups in any surgical studies, heterogeneity in time since intervention and degree of weight loss, and small sample sizes hindered the drawing of robust conclusions across studies.
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Affiliation(s)
- Alhanouf S. Al‐Alsheikh
- Department of Metabolism, Digestion and Reproduction, Imperial College LondonHammersmith HospitalLondonUK
- Department of Community Health Sciences, College of Applied Medical SciencesKing Saud UniversityRiyadhSaudi Arabia
| | - Shahd Alabdulkader
- Department of Metabolism, Digestion and Reproduction, Imperial College LondonHammersmith HospitalLondonUK
- Department of Health Sciences, College of Health and Rehabilitation SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadhSaudi Arabia
| | - Alexander D. Miras
- Department of Metabolism, Digestion and Reproduction, Imperial College LondonHammersmith HospitalLondonUK
- School of Medicine, Faculty of Life and Health SciencesUlster UniversityLondonderryUK
| | - Anthony P. Goldstone
- PsychoNeuroEndocrinology Research Group, Division of Psychiatry, Department of Brain Sciences, Imperial College LondonHammersmith HospitalLondonUK
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Cincotta AH. Brain Dopamine-Clock Interactions Regulate Cardiometabolic Physiology: Mechanisms of the Observed Cardioprotective Effects of Circadian-Timed Bromocriptine-QR Therapy in Type 2 Diabetes Subjects. Int J Mol Sci 2023; 24:13255. [PMID: 37686060 PMCID: PMC10487918 DOI: 10.3390/ijms241713255] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/19/2023] [Accepted: 07/27/2023] [Indexed: 09/10/2023] Open
Abstract
Despite enormous global efforts within clinical research and medical practice to reduce cardiovascular disease(s) (CVD), it still remains the leading cause of death worldwide. While genetic factors clearly contribute to CVD etiology, the preponderance of epidemiological data indicate that a major common denominator among diverse ethnic populations from around the world contributing to CVD is the composite of Western lifestyle cofactors, particularly Western diets (high saturated fat/simple sugar [particularly high fructose and sucrose and to a lesser extent glucose] diets), psychosocial stress, depression, and altered sleep/wake architecture. Such Western lifestyle cofactors are potent drivers for the increased risk of metabolic syndrome and its attendant downstream CVD. The central nervous system (CNS) evolved to respond to and anticipate changes in the external (and internal) environment to adapt survival mechanisms to perceived stresses (challenges to normal biological function), including the aforementioned Western lifestyle cofactors. Within the CNS of vertebrates in the wild, the biological clock circuitry surveils the environment and has evolved mechanisms for the induction of the obese, insulin-resistant state as a survival mechanism against an anticipated ensuing season of low/no food availability. The peripheral tissues utilize fat as an energy source under muscle insulin resistance, while increased hepatic insulin resistance more readily supplies glucose to the brain. This neural clock function also orchestrates the reversal of the obese, insulin-resistant condition when the low food availability season ends. The circadian neural network that produces these seasonal shifts in metabolism is also responsive to Western lifestyle stressors that drive the CNS clock into survival mode. A major component of this natural or Western lifestyle stressor-induced CNS clock neurophysiological shift potentiating the obese, insulin-resistant state is a diminution of the circadian peak of dopaminergic input activity to the pacemaker clock center, suprachiasmatic nucleus. Pharmacologically preventing this loss of circadian peak dopaminergic activity both prevents and reverses existing metabolic syndrome in a wide variety of animal models of the disorder, including high fat-fed animals. Clinically, across a variety of different study designs, circadian-timed bromocriptine-QR (quick release) (a unique formulation of micronized bromocriptine-a dopamine D2 receptor agonist) therapy of type 2 diabetes subjects improved hyperglycemia, hyperlipidemia, hypertension, immune sterile inflammation, and/or adverse cardiovascular event rate. The present review details the seminal circadian science investigations delineating important roles for CNS circadian peak dopaminergic activity in the regulation of peripheral fuel metabolism and cardiovascular biology and also summarizes the clinical study findings of bromocriptine-QR therapy on cardiometabolic outcomes in type 2 diabetes subjects.
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Carnell S, Steele KE, Thapaliya G, Kuwubara H, Aghababian A, Papantoni A, Nandi A, Brašić JR, Moran TH, Wong DF. Milkshake Acutely Stimulates Dopamine Release in Ventral and Dorsal Striatum in Healthy-Weight Individuals and Patients with Severe Obesity Undergoing Bariatric Surgery: A Pilot Study. Nutrients 2023; 15:2671. [PMID: 37375579 DOI: 10.3390/nu15122671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/31/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023] Open
Abstract
The overconsumption of palatable energy-dense foods drives obesity, but few human studies have investigated dopamine (DA) release in response to the consumption of a palatable meal, a putative mediator of excess intake in obesity. We imaged [11C]raclopride in the brain with positron emission tomography (PET) to assess striatal dopamine (DA) receptor binding pre- and post-consumption of a highly palatable milkshake (250 mL, 420 kcal) in 11 females, 6 of whom had severe obesity, and 5 of whom had healthy-weight. Those with severe obesity underwent assessments pre- and 3 months post-vertical sleeve gastrectomy (VSG). Our results demonstrated decreased post- vs. pre-meal DA receptor binding in the ventral striatum (p = 0.032), posterior putamen (p = 0.012), and anterior caudate (p = 0.018), consistent with meal-stimulated DA release. Analysis of each group separately suggested that results in the caudate and putamen were disproportionately driven by meal-associated changes in the healthy-weight group. Baseline (pre-meal) DA receptor binding was lower in severe obesity than in the healthy-weight group. Baseline DA receptor binding and DA release did not change from pre- to post-surgery. The results of this small pilot study suggest that milkshake acutely stimulates DA release in the ventral and dorsal striatum. This phenomenon likely contributes to the overconsumption of highly palatable foods in the modern environment.
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Affiliation(s)
- Susan Carnell
- Division of Child and Adolescent Psychiatry, Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Kimberley E Steele
- Johns Hopkins Center for Bariatric Surgery, Department of Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA
| | - Gita Thapaliya
- Division of Child and Adolescent Psychiatry, Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Hiroto Kuwubara
- Section of High Resolution Brain Positron Emission Tomography Imaging, Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Anahys Aghababian
- Division of Child and Adolescent Psychiatry, Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Afroditi Papantoni
- Division of Child and Adolescent Psychiatry, Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Ayon Nandi
- Section of High Resolution Brain Positron Emission Tomography Imaging, Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - James R Brašić
- Section of High Resolution Brain Positron Emission Tomography Imaging, Division of Nuclear Medicine and Molecular Imaging, The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Timothy H Moran
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Dean F Wong
- Mallinckrodt Institute of Radiology, Departments of Radiology, Psychiatry, Neurology, Neuroscience, Washington University in St. Louis School of Medicine, St. Louis, MO 63110, USA
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Ribeiro G, Maia A, Cotovio G, Oliveira FPM, Costa DC, Oliveira-Maia AJ. Striatal dopamine D2-like receptors availability in obesity and its modulation by bariatric surgery: a systematic review and meta-analysis. Sci Rep 2023; 13:4959. [PMID: 36973321 PMCID: PMC10042861 DOI: 10.1038/s41598-023-31250-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 03/08/2023] [Indexed: 03/29/2023] Open
Abstract
There is significant evidence linking a 'reward deficiency syndrome' (RDS), comprising decreased availability of striatal dopamine D2-like receptors (DD2lR) and addiction-like behaviors underlying substance use disorders and obesity. Regarding obesity, a systematic review of the literature with a meta-analysis of such data is lacking. Following a systematic review of the literature, we performed random-effects meta-analyses to determine group differences in case-control studies comparing DD2lR between individuals with obesity and non-obese controls and prospective studies of pre- to post-bariatric surgery DD2lR changes. Cohen's d was used to measure effect size. Additionally, we explored factors potentially associated with group differences in DD2lR availability, such as obesity severity, using univariate meta-regression. In a meta-analysis including positron emission tomography (PET) and single-photon emission computed tomography (SPECT) studies, striatal DD2lR availability did not significantly differ between obesity and controls. However, in studies comprising patients with class III obesity or higher, group differences were significant, favoring lower DD2lR availability in the obesity group. This effect of obesity severity was corroborated by meta-regressions showing inverse associations between the body mass index (BMI) of the obesity group and DD2lR availability. Post-bariatric changes in DD2lR availability were not found, although a limited number of studies were included in this meta-analysis. These results support lower DD2lR in higher classes of obesity which is a more targeted population to explore unanswered questions regarding the RDS.
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Affiliation(s)
- Gabriela Ribeiro
- Champalimaud Research and Clinical Centre, Champalimaud Foundation, Av. de Brasília, Doca de Pedrouços, 1400-038, Lisboa, Portugal
- Lisbon Academic Medical Centre PhD Program, Faculdade de Medicina da Universidade de Lisboa, Avenida Professor Egas Moniz, 1649-028, Lisboa, Portugal
- Nova Medical School, Faculdade de Ciências Médicas, NMS, FCM, Universidade Nova de Lisboa, Campo Mártires da Pátria 130, 1169-056, Lisboa, Portugal
- Nutrition and Metabolism Department, Nova Medical School, Faculdade de Ciências Médicas, NMS, FCM, Universidade Nova de Lisboa, Campo Mártires da Pátria 130, 1169-056, Lisboa, Portugal
| | - Ana Maia
- Champalimaud Research and Clinical Centre, Champalimaud Foundation, Av. de Brasília, Doca de Pedrouços, 1400-038, Lisboa, Portugal
- Nova Medical School, Faculdade de Ciências Médicas, NMS, FCM, Universidade Nova de Lisboa, Campo Mártires da Pátria 130, 1169-056, Lisboa, Portugal
- Department of Psychiatry and Mental Health, Centro Hospitalar de Lisboa Ocidental, Rua da Junqueira, 126, 1340-019, Lisboa, Portugal
| | - Gonçalo Cotovio
- Champalimaud Research and Clinical Centre, Champalimaud Foundation, Av. de Brasília, Doca de Pedrouços, 1400-038, Lisboa, Portugal
- Nova Medical School, Faculdade de Ciências Médicas, NMS, FCM, Universidade Nova de Lisboa, Campo Mártires da Pátria 130, 1169-056, Lisboa, Portugal
- Department of Psychiatry and Mental Health, Centro Hospitalar de Lisboa Ocidental, Rua da Junqueira, 126, 1340-019, Lisboa, Portugal
| | - Francisco P M Oliveira
- Champalimaud Research and Clinical Centre, Champalimaud Foundation, Av. de Brasília, Doca de Pedrouços, 1400-038, Lisboa, Portugal
| | - Durval C Costa
- Champalimaud Research and Clinical Centre, Champalimaud Foundation, Av. de Brasília, Doca de Pedrouços, 1400-038, Lisboa, Portugal
| | - Albino J Oliveira-Maia
- Champalimaud Research and Clinical Centre, Champalimaud Foundation, Av. de Brasília, Doca de Pedrouços, 1400-038, Lisboa, Portugal.
- Nova Medical School, Faculdade de Ciências Médicas, NMS, FCM, Universidade Nova de Lisboa, Campo Mártires da Pátria 130, 1169-056, Lisboa, Portugal.
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Miller AE, Daiwile AP, Cadet JL. Sex-Dependent Alterations in the mRNA Expression of Enzymes Involved in Dopamine Synthesis and Breakdown After Methamphetamine Self-Administration. Neurotox Res 2022; 40:1464-1478. [PMID: 35834057 DOI: 10.1007/s12640-022-00545-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 06/28/2022] [Accepted: 07/04/2022] [Indexed: 10/17/2022]
Abstract
Sex differences have been reported in methamphetamine (METH) use disorder in humans and in animal models of METH exposure. Specifically, animals that self-administer METH show sex-related dissimilarities in dopamine (DA) metabolism. To better understand the molecular bases for the differences in DA metabolism, we measured the levels of mRNAs of enzymes that catalyze DA synthesis and breakdown in the prefrontal cortex (PFC), nucleus accumbens (NAc), dorsal striatum (dSTR), and hippocampus (HIP) of rats that had self-administered METH. There were significant sex differences in control rats, with males having higher basal levels of Th in the PFC and dSTR, Ddc in the NAc, and MaoB in the HIP. In contrast, female controls showed higher basal levels of Comt in the HIP. Male and female METH SA rats also showed some distinct responses to the drug. Specifically, female METH rats exhibited increased expression of Ddc and MaoB, whereas male METH animals showed higher levels of Comt mRNA in the PFC compared to their respective controls. In the NAc, male METH rats displayed decreased Th and Ddc mRNA levels. Together, our results identified sex-dependent and region-specific changes in the mRNA expression of several enzymes involved in DA synthesis and breakdown in response to METH SA, with the majority of differences being observed in the mesocorticolimbic dopaminergic system. These findings are of significant translational importance providing further support for the inclusion of sex as an important variable when planning and evaluating therapeutic interventions against METH use disorder in human clinical studies.
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Affiliation(s)
- Aaron E Miller
- Molecular Neuropsychiatry Research Branch, NIDA Intramural Research Program, Baltimore, MD, 21224, USA
| | - Atul P Daiwile
- Molecular Neuropsychiatry Research Branch, NIDA Intramural Research Program, Baltimore, MD, 21224, USA
| | - Jean Lud Cadet
- Molecular Neuropsychiatry Research Branch, NIDA Intramural Research Program, Baltimore, MD, 21224, USA.
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Molecular Imaging of Central Dopamine in Obesity: A Qualitative Review across Substrates and Radiotracers. Brain Sci 2022; 12:brainsci12040486. [PMID: 35448017 PMCID: PMC9031606 DOI: 10.3390/brainsci12040486] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/05/2022] [Accepted: 04/06/2022] [Indexed: 02/04/2023] Open
Abstract
Dopamine is a neurotransmitter that plays a crucial role in adaptive behavior. A wealth of studies suggests obesity-related alterations in the central dopamine system. The most direct evidence for such differences in humans comes from molecular neuroimaging studies using positron emission tomography (PET) and single-photon emission computed tomography (SPECT). The aim of the current review is to give a comprehensive overview of molecular neuroimaging studies that investigated the relation between BMI or weight status and any dopamine target in the striatal and midbrain regions of the human brain. A structured literature search was performed and a summary of the extracted findings are presented for each of the four available domains: (1) D2/D3 receptors, (2) dopamine release, (3) dopamine synthesis, and (4) dopamine transporters. Recent proposals of a nonlinear relationship between severity of obesity and dopamine imbalances are described while integrating findings within and across domains, after which limitations of the review are discussed. We conclude that despite many observed associations between obesity and substrates of the dopamine system in humans, it is unlikely that obesity can be traced back to a single dopaminergic cause or consequence. For effective personalized prevention and treatment of obesity, it will be crucial to identify possible dopamine (and non-dopamine) profiles and their functional characteristics.
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7
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Hanssen R, Thanarajah SE, Tittgemeyer M, Brüning JC. Obesity - A Matter of Motivation? Exp Clin Endocrinol Diabetes 2022; 130:290-295. [PMID: 35181879 PMCID: PMC9286865 DOI: 10.1055/a-1749-4852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Excessive food intake and reduced physical activity have long been established as
primary causes of obesity. However, the underlying mechanisms causing this
unhealthy behavior characterized by heightened motivation for food but not for
physical effort are unclear. Despite the common unjustified stigmatization that
obesity is a result of laziness and lack of discipline, it is becoming
increasingly clear that high-fat diet feeding and obesity cause alterations in
brain circuits that are critical for the control of motivational behavior. In this mini-review, we provide a comprehensive overview of incentive motivation,
its neural encoding in the dopaminergic mesolimbic system as well as its
metabolic modulation with a focus on derangements of incentive motivation in
obesity. We further discuss the emerging field of metabolic interventions to
counteract motivational deficits and their potential clinical implications.
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Affiliation(s)
- Ruth Hanssen
- Max Planck Institute for Metabolism Research, Cologne, Germany.,Policlinic for Endocrinology, Diabetology and Preventive Medicine (PEPD), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - Sharmili E Thanarajah
- Max Planck Institute for Metabolism Research, Cologne, Germany.,Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, University Hospital Frankfurt, Frankfurt am Main, Germany
| | - Marc Tittgemeyer
- Max Planck Institute for Metabolism Research, Cologne, Germany.,Cluster of Excellence in Cellular Stress Responses in Aging-associated Diseases (CECAD), Cologne, Germany
| | - Jens C Brüning
- Max Planck Institute for Metabolism Research, Cologne, Germany.,Policlinic for Endocrinology, Diabetology and Preventive Medicine (PEPD), University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany.,Cluster of Excellence in Cellular Stress Responses in Aging-associated Diseases (CECAD), Cologne, Germany
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8
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Ji L, Fang Y, Tang J, Liu C, Huang C, Hu Q, Li Q, Chen Z. Synthesis and biological evaluation of 18F-labelled dopamine D 3 receptor selective ligands. Bioorg Med Chem Lett 2022; 62:128630. [PMID: 35182773 DOI: 10.1016/j.bmcl.2022.128630] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 02/13/2022] [Accepted: 02/14/2022] [Indexed: 12/29/2022]
Abstract
The dopamine D3 receptor (D3R) is highly expressed in the limbic regions of the brain and closely related to a variety of neurological disorders including Parkinson's disease, schizophrenia and drug-seeking behavior. In vivo imaging of D3R with radio-labelled tracers and positron emission tomography (PET) has become a powerful technique in related disorders. In this study, we synthesized three novel aromatically 18F-labelled phenylpiperazine-like D3R selective radioactive ligands ([18F]5b, [18F]8b and [18F]11b) and developed a simple, rapid and efficient 18F-labelling method by condition optimization. Radiosynthesis of [18F]5b, [18F]8b and [18F]11b was achieved by 18F-fluorination from nitroarene precursors. Final radiochemical purities of [18F]5b, [18F]8b and [18F]11b solution were > 99% and remained good stability (> 98% for up to 6 h) in PBS and FBS. PET imaging and cellular binding studies revealed that [18F]8b had a higher D3R affinity than [18F]5b and [18F]11b. Autoradiography and biodistribution studies of the brain showed that [18F]8b had medium intensity specific accumulation in the striatum and cortex. Meanwhile, the low skeletal uptake of [18F]8b revealed a good in vivo stability with negligible defluorination. These results indicated that [18F]8b might be a potential 18F-labelled D3R PET imaging agent.
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Affiliation(s)
- Linyang Ji
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou 221004, China
| | - Yi Fang
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Jie Tang
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Chunyi Liu
- NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China
| | - Caiyun Huang
- School of Pharmaceutical Science, Inner Mongolia Medical University, Hohhot 010110, China
| | - Qianyue Hu
- Department of Radiopharmaceuticals, School of Pharmacy, Nanjing Medical University, Nanjing 211166, China
| | - Qingming Li
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou 221004, China
| | - Zhengping Chen
- Jiangsu Key Laboratory of New Drug Research and Clinical Pharmacy, School of Pharmacy, Xuzhou Medical University, Xuzhou 221004, China; NHC Key Laboratory of Nuclear Medicine, Jiangsu Key Laboratory of Molecular Nuclear Medicine, Jiangsu Institute of Nuclear Medicine, Wuxi 214063, China.
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Pak K, Seo S, Kim K, Lee MJ, Kim IJ. SLC6A3
gene polymorphisms is associated with striatal dopamine transporter changes after glucose loading. Synapse 2022; 76:e22223. [DOI: 10.1002/syn.22223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 12/08/2021] [Accepted: 01/23/2022] [Indexed: 11/08/2022]
Affiliation(s)
- Kyoungjune Pak
- Department of Nuclear Medicine and Biomedical Research Institute Pusan National University Hospital Busan Republic of Korea
| | - Seongho Seo
- Department of Electronic Engineering Pai Chai University Daejeon Republic of Korea
| | - Keunyoung Kim
- Department of Nuclear Medicine and Biomedical Research Institute Pusan National University Hospital Busan Republic of Korea
| | - Myung. Jun Lee
- Department of Neurology Pusan National University Hospital Busan Republic of Korea
| | - In. Joo Kim
- Department of Nuclear Medicine and Biomedical Research Institute Pusan National University Hospital Busan Republic of Korea
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Pak K, Kim K, Seo S, Lee MJ, Kim IJ. Serotonin transporter is negatively associated with body mass index after glucose loading in humans. Brain Imaging Behav 2022; 16:1246-1251. [PMID: 34981428 DOI: 10.1007/s11682-021-00600-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/02/2021] [Indexed: 11/26/2022]
Abstract
Serotonin transporter (SERT) is a presynaptically localized membrane protein that regulates the serotonin transmission via its reuptake of released serotonin. We hypothesized that glucose loading may change SERT availability from brainstem in humans. An intravenous bolus injection of 18F-FP-CIT was administered after the infusion of glucose or placebo (normal saline), and the emission data were acquired over 90 mins in 33 healthy nonobese subjects. For a volume-of-interest-based analysis, an atlas involving midbrain, and pons was applied. SERT availability, binding potential (BPND), were measured via the simplified reference tissue method with a reference of cerebellum. For a voxel-based analysis, statistical parametric mapping 12 was used with parametric BPND images. BPNDs from midbrain (p=0.8937), and pons (p=0.1115) were not different between glucose and placebo loading. Both of BPNDs from midbrain after glucose, and placebo loading were negatively correlated with body mass index (BMI). BMI showed a trend of negative correlation with glucose-loaded BPND from pons, whereas, placebo-loaded BPNDs from pons did not show any significant association with BMI. In conclusion, SERT availability was negatively correlated with BMI after glucose loading in humans. SERT might have a role in eating behavior through the action of insulin. Further studies are needed to elucidate the underlying mechanism of this phenomenon.
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Affiliation(s)
- Kyoungjune Pak
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan, 49241, Republic of Korea.
| | - Keunyoung Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan, 49241, Republic of Korea
| | - Seongho Seo
- Department of Electronic Engineering, Pai Chai University, Daejeon, Republic of Korea
| | - Myung Jun Lee
- Department of Neurology, Pusan National University Hospital, Busan, Republic of Korea
| | - In Joo Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, 179 Gudeok-ro, Seo-gu, Busan, 49241, Republic of Korea
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Pak K, Seo S, Lee MJ, Kim K, Suh S, Im HJ, Kim IJ. Striatal DAT availability does not change after supraphysiological glucose loading dose in humans. Endocr Connect 2021; 10:1266-1272. [PMID: 34491899 PMCID: PMC8558882 DOI: 10.1530/ec-21-0355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 09/07/2021] [Indexed: 11/08/2022]
Abstract
Brain dopamine neurotransmission is regulated by the dopamine transporter (DAT), which drives reuptake of extracellular dopamine into the presynaptic neurons. We hypothesized that the glucose loading dose would affect the striatal DAT availability. An i.v. bolus injection of 18F-FP-CIT was administered after infusion of low-dose glucose (300 mg/kg), high-dose glucose (600 mg/kg) or placebo (normal saline). The emission data were acquired over 90 min in 23 healthy male subjects. Substantial increases of binding potential (BPNDs) from ventral striatum (VST), caudate nucleus, and putamen were observed after low-dose glucose loading (+26.0, +87.0, and +37.8%) and after high-dose glucose loading (+10.4, +51.9, and +22.0%). BPNDs of the caudate nucleus and putamen showed significant differences (P = 0.0472 and 0.0221) after placebo, low-dose glucose, and high-dose glucose loading. BPNDs in the caudate nucleus and putamen after placebo, low-dose glucose, and high-dose glucose loading were positively intercorrelated with each other. In conclusion, striatal DAT changes after physiological glucose loading, but not after supraphysiological glucose loading in humans. DAT availabilities after placebo, low-dose glucose, high-dose glucose loading were correlated to each other in the caudate nucleus and putamen, but not in the VST. Therefore, sub-regional variability in DAT regulatory mechanisms mediated by insulin may exist in humans.
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Affiliation(s)
- Kyoungjune Pak
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
- Correspondence should be addressed to K Pak:
| | - Seongho Seo
- Department of Electronic Engineering, Pai Chai University, Daejeon, Republic of Korea
| | - Myung Jun Lee
- Department of Neurology, Pusan National University Hospital, Busan, Republic of Korea
| | - Keunyoung Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Sunghwan Suh
- Department of Internal Medicine, Dong-A University College of Medicine, Busan, Republic of Korea
| | - Hyung-Jun Im
- Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Republic of Korea
| | - In Joo Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
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12
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Pak K, Seo S, Lee MJ, Kim K, Suh S, Lee J, Kim SJ, Kim IJ. Hedonic Rating of Sucrose Is Sub-Regionally Associated with Striatal Dopamine Transporter in Humans. Neuroendocrinology 2021; 112:338-344. [PMID: 34034262 DOI: 10.1159/000517319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 05/20/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND Eating behavior is determined by both homeostatic and hedonic values. OBJECTIVE We investigated the association of hedonic value with striatal dopamine transporter (DAT) availability sub-regionally. METHOD An intravenous bolus injection of 18F-FP-CIT was administered after the infusion of glucose or placebo, and the emission data were acquired over 90 min. DAT availability and binding potential (BPND) were measured via the simplified reference tissue method. Subjects were assessed with sensory taste test of sucrose solutions. The "most liked" sucrose concentration (%) was determined as the hedonic rating for sucrose. RESULTS Twenty healthy males participated in this study. After glucose loading, BPNDs of putamen significantly increased, and those of caudate nucleus showed the increasing trend, while those of ventral striatum were not significantly different. After glucose loading, the "most liked" sucrose concentration (%) was negatively associated with BPNDs of caudate nucleus and showed the trend of positive association with those from ventral striatum. Slopes of regression lines were significantly different according to the sub-regions of striatum. CONCLUSION We have highlighted that striatal DAT increased after glucose loading in dorsal striatum, not in ventral striatum. These changes of striatal DAT were sub-regionally associated with the hedonic rating of sucrose from each subject.
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Affiliation(s)
- Kyoungjune Pak
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital and School of Medicine, Pusan National University, Busan, Republic of Korea
| | - Seongho Seo
- Department of Electronic Engineering, Pai Chai University, Daejeon, Republic of Korea
| | - Myung Jun Lee
- Department of Neurology, Pusan National University Hospital, Busan, Republic of Korea
| | - Keunyoung Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital and School of Medicine, Pusan National University, Busan, Republic of Korea
| | - Sunghwan Suh
- Department of Internal Medicine, Dong-A University College of Medicine, Busan, Republic of Korea
| | - Jeehyun Lee
- Department of Food Science and Nutrition, Pusan National University, Busan, Republic of Korea
| | - Seong-Jang Kim
- Department of Nuclear Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - In Joo Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital and School of Medicine, Pusan National University, Busan, Republic of Korea
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13
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Converging vulnerability factors for compulsive food and drug use. Neuropharmacology 2021; 196:108556. [PMID: 33862029 DOI: 10.1016/j.neuropharm.2021.108556] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 03/29/2021] [Accepted: 04/03/2021] [Indexed: 12/12/2022]
Abstract
Highly palatable foods and substance of abuse have intersecting neurobiological, metabolic and behavioral effects relevant for understanding vulnerability to conditions related to food (e.g., obesity, binge eating disorder) and drug (e.g., substance use disorder) misuse. Here, we review data from animal models, clinical populations and epidemiological evidence in behavioral, genetic, pathophysiologic and therapeutic domains. Results suggest that consumption of highly palatable food and drugs of abuse both impact and conversely are regulated by metabolic hormones and metabolic status. Palatable foods high in fat and/or sugar can elicit adaptation in brain reward and withdrawal circuitry akin to substances of abuse. Intake of or withdrawal from palatable food can impact behavioral sensitivity to drugs of abuse and vice versa. A robust literature suggests common substrates and roles for negative reinforcement, negative affect, negative urgency, and impulse control deficits, with both highly palatable foods and substances of abuse. Candidate genetic risk loci shared by obesity and alcohol use disorders have been identified in molecules classically associated with both metabolic and motivational functions. Finally, certain drugs may have overlapping therapeutic potential to treat obesity, diabetes, binge-related eating disorders and substance use disorders. Taken together, data are consistent with the hypotheses that compulsive food and substance use share overlapping, interacting substrates at neurobiological and metabolic levels and that motivated behavior associated with feeding or substance use might constitute vulnerability factors for one another. This article is part of the special issue on 'Vulnerabilities to Substance Abuse'.
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14
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Abstract
There is increasing evidence demonstrating that reward-related motivational food intake is closely connected with the brain's homeostatic system of energy balance and that this interaction might be important in the integrative control of feeding behavior. Dopamine regulates motivational behavior, including feeding behaviors, and the dopamine reward system is recognized as the most prominent system that controls appetite and motivational and emotional drives for food. It appears that the dopamine system exerts a critical role in the control of feeding behavior not only by the reward-related circuit, but also by contributing to the homeostatic circuit of food intake, suggesting that dopamine plays an integrative role across the converging circuitry of control of food intake by linking energy state-associated signals to reward-related behaviors. This review will cover and discuss up-to-date findings on the dopaminergic control of food intake by both the reward-related circuit and the homeostatic hypothalamic system.
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Affiliation(s)
- Ja-Hyun Baik
- Molecular Neurobiology Laboratory, Department of Life Sciences, Korea University, Seoul, Korea
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15
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Boswell RG, Potenza MN, Grilo CM. The Neurobiology of Binge-eating Disorder Compared with Obesity: Implications for Differential Therapeutics. Clin Ther 2021; 43:50-69. [PMID: 33257092 PMCID: PMC7902428 DOI: 10.1016/j.clinthera.2020.10.014] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 10/30/2020] [Accepted: 10/30/2020] [Indexed: 12/13/2022]
Abstract
PURPOSE Emerging work indicates divergence in the neurobiologies of binge-eating disorder (BED) and obesity despite their frequent co-occurrence. This review highlights specific distinguishing aspects of BED, including elevated impulsivity and compulsivity possibly involving the mesocorticolimbic dopamine system, and discusses implications for differential therapeutics for BED. METHODS This narrative review describes epidemiologic, clinical, genetic, and preclinical differences between BED and obesity. Subsequently, this review discusses human neuroimaging work reporting differences in executive functioning, reward processing, and emotion reactivity in BED compared with obesity. Finally, on the basis of the neurobiology of BED, this review identifies existing and new therapeutic agents that may be most promising given their specific targets based on putative mechanisms of action relevant specifically to BED. FINDINGS BED is characterized by elevated impulsivity and compulsivity compared with obesity, which is reflected in divergent neurobiological characteristics and effective pharmacotherapies. Therapeutic agents that influence both reward and executive function systems may be especially effective for BED. IMPLICATIONS Greater attention to impulsivity/compulsivity-related, reward-related, and emotion reactivity-related processes may enhance conceptualization and treatment approaches for patients with BED. Consideration of these distinguishing characteristics and processes could have implications for more targeted pharmacologic treatment research and interventions.
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Affiliation(s)
- Rebecca G Boswell
- Yale School of Medicine, Department of Psychiatry, New Haven, CT, USA.
| | - Marc N Potenza
- Yale School of Medicine, Department of Psychiatry, New Haven, CT, USA; Connecticut Mental Health Center, New Haven, CT, USA; Connecticut Council on Problem Gambling, Wethersfield, CT, USA; Yale School of Medicine, Child Study Center, New Haven, CT, USA; Yale University, Department of Neuroscience, New Haven, CT, USA
| | - Carlos M Grilo
- Yale School of Medicine, Department of Psychiatry, New Haven, CT, USA; Yale University, Department of Psychology, New Haven, CT, USA
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16
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Metaplasticity in the Ventral Pallidum as a Potential Marker for the Propensity to Gain Weight in Chronic High-Calorie Diet. J Neurosci 2020; 40:9725-9735. [PMID: 33199503 DOI: 10.1523/jneurosci.1809-20.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Revised: 10/03/2020] [Accepted: 10/06/2020] [Indexed: 12/30/2022] Open
Abstract
A major driver of obesity is the increasing palatability of processed foods. Although reward circuits promote the consumption of palatable food, their involvement in obesity remains unclear. The ventral pallidum (VP) is a key hub in the reward system that encodes the hedonic aspects of palatable food consumption and participates in various proposed feeding circuits. However, there is still no evidence for its involvement in developing diet-induced obesity. Here we examine, using male C57BL6/J mice and patch-clamp electrophysiology, how chronic high-fat high-sugar (HFHS) diet changes the physiology of the VP and whether mice that gain the most weight differ in their VP physiology from others. We found that 10-12 weeks of HFHS diet hyperpolarized and decreased the firing rate of VP neurons without a major change in synaptic inhibitory input. Within the HFHS group, the top 33% weight gainers (WGs) had a more hyperpolarized VP with longer latency to fire action potentials on depolarization compared with bottom 33% of weight gainers (i.e., non-weight gainers). WGs also showed synaptic potentiation of inhibitory inputs both at the millisecond and minute ranges. Moreover, we found that the tendency to potentiate the inhibitory inputs to the VP might exist in overeating mice even before exposure to HFHS, thus making it a potential property of being an overeater. These data point to the VP as a critical player in obesity and suggest that hyperpolarized membrane potential of, and potentiated inhibitory inputs to, VP neurons may play a significant role in promoting the overeating of palatable food.SIGNIFICANCE STATEMENT In modern world, where highly palatable food is readily available, overeating is often driven by motivational, rather than metabolic, needs. It is thus conceivable that reward circuits differ between obese and normal-weight individuals. But is such difference, if it exists, innate or does it develop with overeating? Here we reveal synaptic properties in the ventral pallidum, a central hub of reward circuits, that differ between mice that gain the most and the least weight when given unlimited access to highly palatable food. We show that these synaptic differences also exist without exposure to palatable food, potentially making them innate properties that render some more susceptible than others to overeat. Thus, the propensity to overeat may have a strong innate component embedded in reward circuits.
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17
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Neuroimaging of Sex/Gender Differences in Obesity: A Review of Structure, Function, and Neurotransmission. Nutrients 2020; 12:nu12071942. [PMID: 32629783 PMCID: PMC7400469 DOI: 10.3390/nu12071942] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 06/24/2020] [Accepted: 06/25/2020] [Indexed: 02/06/2023] Open
Abstract
While the global prevalence of obesity has risen among both men and women over the past 40 years, obesity has consistently been more prevalent among women relative to men. Neuroimaging studies have highlighted several potential mechanisms underlying an individual’s propensity to become obese, including sex/gender differences. Obesity has been associated with structural, functional, and chemical alterations throughout the brain. Whereas changes in somatosensory regions appear to be associated with obesity in men, reward regions appear to have greater involvement in obesity among women than men. Sex/gender differences have also been observed in the neural response to taste among people with obesity. A more thorough understanding of these neural and behavioral differences will allow for more tailored interventions, including diet suggestions, for the prevention and treatment of obesity.
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18
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Woodcock EA, Zakiniaeiz Y, Morris ED, Cosgrove KP. Sex and the dopaminergic system: Insights from addiction studies. HANDBOOK OF CLINICAL NEUROLOGY 2020; 175:141-165. [PMID: 33008522 DOI: 10.1016/b978-0-444-64123-6.00011-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Sex differences are present in psychiatric disorders associated with disrupted dopamine function, and thus, sex differences in dopamine neurobiology may underlie these clinical disparities. In this chapter, we review sex differences in the dopaminergic system with a focus on substance use disorders, especially tobacco smoking, as our exemplar disorder. This chapter is organized into five sections describing sex differences in the dopaminergic system: (1) neurobiology, (2) role of sex hormones, (3) genetic underpinnings, (4) cognitive function, and (5) influence on addiction. In each section, we provide an overview of the topic area, summarize sex differences identified to date, highlight addiction research, especially clinical neuroimaging studies, and suggest avenues for future research.
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Affiliation(s)
- Eric A Woodcock
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, United States; Department of Psychiatry, Yale School of Medicine, New Haven, CT, United States; Yale Positron Emission Tomography (PET) Center, Yale University, New Haven, CT, United States
| | - Yasmin Zakiniaeiz
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, United States; Yale Positron Emission Tomography (PET) Center, Yale University, New Haven, CT, United States
| | - Evan D Morris
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, United States; Department of Psychiatry, Yale School of Medicine, New Haven, CT, United States; Department of Biomedical Engineering, Yale University, New Haven, CT, United States; Department of Biomedical Engineering, Yale University, New Haven, CT, United States; Invicro, LLC, New Haven, CT, United States
| | - Kelly P Cosgrove
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, CT, United States; Department of Psychiatry, Yale School of Medicine, New Haven, CT, United States; Yale Positron Emission Tomography (PET) Center, Yale University, New Haven, CT, United States.
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19
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Pak K, Seo S, Kim K, Lee MJ, Shin MJ, Suh S, Im HJ, Park JJ, Kim SJ, Kim IJ. Striatal dopamine transporter changes after glucose loading in humans. Diabetes Obes Metab 2020; 22:116-122. [PMID: 31478329 DOI: 10.1111/dom.13872] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 08/20/2019] [Accepted: 08/28/2019] [Indexed: 12/31/2022]
Abstract
AIMS The dopamine transporter (DAT) actively translocates dopamine that is released from the presynaptic neurons across the membranes of nerve terminals into the extracellular space. We hypothesized that glucose loading-induced changes in striatal DAT levels could be associated with food intake in humans. MATERIALS AND METHODS An intravenous bolus injection of 18 F-FP-CIT was administered after infusion of glucose or placebo (normal saline), and emission data were acquired over 90 minutes in 33 healthy males. For a volume-of-interest-based analysis, an atlas involving sub-striatal regions of ventral striatum (VST), caudate nucleus and putamen was applied. DAT availability and binding potential (BPND ) were measured using a simplified reference tissue method with cerebellum as the reference. RESULTS The glucose-loaded BPND from the VST negatively correlated with body mass index (BMI), whereas the placebo-loaded BPND from the VST did not. After loading with glucose, there were substantial increases in BPND s: 18.3%, 71.7% and 34.0% on average in the VST, caudate nucleus and putamen, respectively. CONCLUSION Striatal DAT changes after glucose loading, and BMI is associated with glucose-loaded DAT availability, not with placebo-loaded DAT availability. DAT might have a role in the reward system of eating behavior.
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Affiliation(s)
- Kyoungjune Pak
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Seongho Seo
- Department of Neuroscience, College of Medicine, Gachon University, Incheon, Republic of Korea
- Neuroscience Research Institute, Gachon University, Incheon, Republic of Korea
| | - Keunyoung Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
| | - Myung Jun Lee
- Department of Neurology, Pusan National University Hospital, Busan, Republic of Korea
| | - Myung Jun Shin
- Department of Rehabilitation Medicine, Pusan National University Hospital, Busan, Republic of Korea
| | - Sunghwan Suh
- Department of Internal Medicine, Dong-A University College of Medicine, Busan, Republic of Korea
| | - Hyung-Jun Im
- Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Republic of Korea
| | - Jung-Jun Park
- Division of Sport Science, Pusan National University, Busan, Republic of Korea
| | - Seong-Jang Kim
- Department of Nuclear Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - In Joo Kim
- Department of Nuclear Medicine and Biomedical Research Institute, Pusan National University Hospital, Busan, Republic of Korea
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20
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Beedie C, Benedetti F, Barbiani D, Camerone E, Lindheimer J, Roelands B. Incorporating methods and findings from neuroscience to better understand placebo and nocebo effects in sport. Eur J Sport Sci 2019; 20:313-325. [PMID: 31573836 PMCID: PMC10181912 DOI: 10.1080/17461391.2019.1675765] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Placebo and nocebo effects are a factor in sports performance. However, the majority of published studies in sport science are descriptive and speculative regarding mechanisms. It is therefore not unreasonable for the sceptic to argue that placebo and nocebo effects in sport are illusory, and might be better explained by variations in phenomena such as motivation. It is likely that, in sport at least, placebo and nocebo effects will remain in this empirical grey area until researchers provide stronger mechanistic evidence. Recent research in neuroscience has identified a number of consistent, discrete and interacting neurobiological and physiological pathways associated with placebo and nocebo effects, with many studies reporting data of potential interest to sport scientists, for example relating to pain, fatigue and motor control. Findings suggest that placebos and nocebos result in activity of the opioid, endocannabinoid and dopamine neurotransmitter systems, brain regions including the motor cortex and striatum, and measureable effects on the autonomic nervous system. Many studies have demonstrated that placebo and nocebo effects associated with a treatment, for example an inert treatment presented as an analgesic or stimulant, exhibit mechanisms similar or identical to the verum or true treatment. Such findings suggest the possibility of a wide range of distinct placebo and nocebo mechanisms that might influence sports performance. In the present paper, we present some of the findings from neuroscience. Focussing on fatigue as an outcome and caffeine as vehicle, we propose three approaches that researchers in sport might incorporate in their studies in order to better elucidate mechanisms of placebo/nocebo effects on performance.
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Affiliation(s)
- Christopher Beedie
- School of Psychology, University of Kent, Canterbury, UK
- CHX Performance, London, UK
| | - Fabrizio Benedetti
- Medicine and Physiology of Hypoxia, Plateau Rosà, Italy/Switzerland
- Neuroscience Dept, University of Turin Medical School, Turin, Italy
| | - Diletta Barbiani
- Neuroscience Dept, University of Turin Medical School, Turin, Italy
| | | | - Jacob Lindheimer
- Department of Veterans Affairs, William S. Middleton Veterans Memorial Hospital, Madison, WI, USA
- Department of Kinesiology, University of Wisconsin–Madison, Madison, WI, USA
| | - Bart Roelands
- Department of Human Physiology, Vije Universiteit Brussels, Belgium
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21
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Leite F, Ribeiro L. Dopaminergic Pathways in Obesity-Associated Inflammation. J Neuroimmune Pharmacol 2019; 15:93-113. [DOI: 10.1007/s11481-019-09863-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Accepted: 07/02/2019] [Indexed: 12/11/2022]
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22
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Towards a Translational Approach to Food Addiction: Implications for Bulimia Nervosa. CURRENT ADDICTION REPORTS 2019. [DOI: 10.1007/s40429-019-00264-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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23
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Enck P, Klosterhalfen S. Does Sex/Gender Play a Role in Placebo and Nocebo Effects? Conflicting Evidence From Clinical Trials and Experimental Studies. Front Neurosci 2019; 13:160. [PMID: 30886569 PMCID: PMC6409330 DOI: 10.3389/fnins.2019.00160] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Accepted: 02/12/2019] [Indexed: 12/12/2022] Open
Abstract
Sex has been speculated to be a predictor of the placebo and nocebo effect for many years, but whether this holds true or not has rarely been investigated. We utilized a placebo literature database on various aspects of the genuine placebo/nocebo response. In 2015, we had extracted 75 systematic reviews, meta-analyses, and meta-regressions performed in major medical areas (neurology, psychiatry, internal medicine). These meta-analyses were screened for whether sex/gender differences had been noted to contribute to the placebo/nocebo effect: in only 3 such analyses female sex was associated with a higher placebo effect, indicating poor evidence for a contribution of sex to it in RCTs. This was updated with another set of meta-analyses for the current review, but did not change the overall conclusion. The same holds true for 18 meta-analyses investigating adverse event (nocebo) reporting in RCT in the placebo arm of trials. We also screened our database for papers referring to sex/gender and the placebo effect in experimental studies, and identified 28 papers reporting 29 experiments. Their results can be summarized as follows: (a) Despite higher sensitivity of pain in females, placebo analgesia is easier to elicit in males; (b) It appears that conditioning is effective specifically eliciting nocebo effects; (c) Conditioning works specifically well to elicit placebo and nocebo effects in females and with nausea; (d) Verbal suggestions are not sufficient to induce analgesia in women, but work in men. These results will be discussed with respect to the question why nausea and pain may be prone to be responsive to sex/gender differences, while other symptoms are less. Lastly, we will discuss the apparent discrepancy between RCT with low relevance of sex, and higher relevance of sex in specific experimental settings. We argue that the placebo response is predominantly the result of a conditioning (learning) response in females, while in males it predominantly may be generated via (verbal) manipulating of expectancies. In RCT therefore, the net outcome of the intervention may be the same despite different mechanisms generating the placebo effect between the sexes, while in experimental work when both pathways are separated and explicitly explored, such differences may surface.
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Affiliation(s)
- Paul Enck
- Department of Internal Medicine VI: Psychosomatic Medicine and Psychotherapy, University Hospital Tübingen, Tübingen, Germany
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24
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Wang GJ, Wiers CE, Shumay E, Tomasi D, Yuan K, Wong CT, Logan J, Fowler JS, Volkow ND. Expectation effects on brain dopamine responses to methylphenidate in cocaine use disorder. Transl Psychiatry 2019; 9:93. [PMID: 30770780 PMCID: PMC6377670 DOI: 10.1038/s41398-019-0421-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 01/04/2019] [Indexed: 11/29/2022] Open
Abstract
The response to drugs of abuse is affected by expectation, which is modulated in part by dopamine (DA), which encodes for a reward prediction error. Here we assessed the effect of expectation on methylphenidate (MP)-induced striatal DA changes in 23 participants with an active cocaine use disorder (CUD) and 23 healthy controls (HC) using [11C]raclopride and PET both after placebo (PL) and after MP (0.5 mg/kg, i.v.). Brain dopamine D2 and D3 receptor availability (D2R: non-displaceable binding potential (BPND)) was measured under four conditions in randomized order: (1) expecting PL/receiving PL, (2) expecting PL/receiving MP, (3) expecting MP/receiving PL, and (4) expecting MP/receiving MP. Expecting MP increased pulse rate compared to expecting PL. Receiving MP decreased D2R in striatum compared to PL, indicating MP-induced striatal DA release, and this effect was significantly blunted in CUD versus HC consistent with prior findings of decreased striatal dopamine responses both in active and detoxified CUD. There was a group × challenge × expectation effect in caudate and midbrain, with expectation of MP increasing MP-induced DA release in HC but not in CUD, and expectation of PL showing a trend to increase MP-induced DA release in CUD but not in HC. These results are consistent with the role of DA in reward prediction error in the human brain: decreasing DA signaling when rewards are less than expected (blunted DA increases to MP in CUD) and increasing them when greater than expected (for PL in CUD reflecting conditioned responses to injection). Our findings also document disruption of the expectation of drug effects in dopamine signaling in participants with CUD compared to non-addicted individuals.
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Affiliation(s)
- Gene-Jack Wang
- Laboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, 20892-1013, USA.
| | - Corinde E. Wiers
- 0000 0004 0481 4802grid.420085.bLaboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-1013 USA
| | - Elena Shumay
- 0000 0004 0481 4802grid.420085.bLaboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-1013 USA
| | - Dardo Tomasi
- 0000 0004 0481 4802grid.420085.bLaboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-1013 USA
| | - Kai Yuan
- 0000 0004 0481 4802grid.420085.bLaboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-1013 USA ,0000 0001 0707 115Xgrid.440736.2School of Life Science and Technology, Xidian University, 710071 Xi’an, Shaanxi China
| | - Christopher T. Wong
- 0000 0004 0481 4802grid.420085.bLaboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-1013 USA
| | - Jean Logan
- 0000 0004 1936 8753grid.137628.9Department of Radiology, New York University, New York, NY 11793 USA
| | - Joanna S. Fowler
- 0000 0004 0481 4802grid.420085.bLaboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-1013 USA ,0000 0001 2188 4229grid.202665.5Brookhaven National Laboratory, Upton, NY 11973 USA
| | - Nora D. Volkow
- 0000 0004 0481 4802grid.420085.bLaboratory of Neuroimaging, National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD 20892-1013 USA ,0000 0001 2297 5165grid.94365.3dNational Institute on Drug Abuse, National Institutes of Health, Bethesda, MD 20892 USA
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25
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Stice E, Burger K. Neural vulnerability factors for obesity. Clin Psychol Rev 2018; 68:38-53. [PMID: 30587407 DOI: 10.1016/j.cpr.2018.12.002] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 10/05/2018] [Accepted: 12/17/2018] [Indexed: 01/09/2023]
Abstract
Multiple theories identify neural vulnerability factors that may increase risk for overeating and weight gain. Early cross-sectional neuroimaging studies were unable to determine whether aberrant neural responsivity was a risk factor for or a consequence of overeating. More recent obesity risk, prospective, repeated-measures, and experimental neuroimaging studies with humans have advanced knowledge of etiologic processes and neural plasticity resulting from overeating. Herein, we review evidence from these more rigorous human neuroimaging studies, in conjunction with behavioral measures reflecting neural function, as well as experiments with animals that investigated neural vulnerability theories for overeating. Findings provide support for the reward surfeit theory that posits that individuals at risk for obesity initially show hyper-responsivity of reward circuitry to high-calorie food tastes, which theoretically drives elevated intake of such foods. However, findings provide little support for the reward deficit theory that postulates that individuals at risk for obesity show an initial hypo-responsivity of reward circuitry that motives overeating. Further, results provide support for the incentive sensitization and dynamic vulnerability theories that propose that overconsumption of high-calorie foods results in increased reward and attention region responsivity to cues that are associated with hedonic reward from intake of these high-calorie foods via conditioning, as well as a simultaneous decrease in reward region responsivity to high-calorie food tastes. However, there is little evidence that this induced reduction in reward region response to high-calorie food tastes drives an escalation in overeating. Finally, results provide support for the theory that an initial deficit in inhibitory control and a bias for immediate reward contribute to overconsumption of high-calorie foods. Findings imply that interventions that reduce reward and attention region responsivity to food cues and increase inhibitory control should reduce overeating and excessive weight gain, an intervention theory that is receiving support in randomized trials.
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Affiliation(s)
- Eric Stice
- Oregon Research Institute, Eugene, OR, USA.
| | - Kyle Burger
- University of North Carolina, Chapel Hill, NC, USA
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26
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Onaolapo A, Onaolapo O. Food additives, food and the concept of ‘food addiction’: Is stimulation of the brain reward circuit by food sufficient to trigger addiction? PATHOPHYSIOLOGY 2018; 25:263-276. [DOI: 10.1016/j.pathophys.2018.04.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2017] [Revised: 02/26/2018] [Accepted: 04/07/2018] [Indexed: 02/08/2023] Open
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27
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van Galen KA, Ter Horst KW, Booij J, la Fleur SE, Serlie MJ. The role of central dopamine and serotonin in human obesity: lessons learned from molecular neuroimaging studies. Metabolism 2018; 85:325-339. [PMID: 28970033 DOI: 10.1016/j.metabol.2017.09.007] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Revised: 09/14/2017] [Accepted: 09/18/2017] [Indexed: 12/11/2022]
Abstract
Obesity results from an imbalance between energy intake and expenditure, and many studies have aimed to determine why obese individuals continue to (over)consume food under conditions of caloric excess. The two major "neurotransmitter hypotheses" of obesity state that increased food intake is partially driven by decreased dopamine-mediated reward and decreased serotonin-mediated homeostatic feedback in response to food intake. Using molecular neuroimaging studies to visualize and quantify aspects of the central dopamine and serotonin systems in vivo, recent PET and SPECT studies have also implicated alterations in these systems in human obesity. The interpretation of these data, however, is more complex than it may appear. Here, we discuss important characteristics and limitations of current radiotracer methods and use this framework to comprehensively review the available human data on central dopamine and serotonin in obesity. On the basis of the available evidence, we conclude that obesity is associated with decreased central dopaminergic and serotonergic signaling and that future research, especially in long-term follow-up and interventional settings, is needed to advance our understanding of the neuronal pathophysiology of obesity in humans.
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Affiliation(s)
- Katy A van Galen
- Department of Endocrinology and Metabolism, Academic Medical Center, Amsterdam, Netherlands
| | - Kasper W Ter Horst
- Department of Endocrinology and Metabolism, Academic Medical Center, Amsterdam, Netherlands
| | - Jan Booij
- Department of Nuclear Medicine, Academic Medical Center, Amsterdam, Netherlands
| | - Susanne E la Fleur
- Department of Endocrinology and Metabolism, Academic Medical Center, Amsterdam, Netherlands; Laboratory of Endocrinology, Department of Clinical Chemistry, Academic Medical Center, Amsterdam, Netherlands; Metabolism and Reward Group, Netherlands Institute for Neuroscience, Amsterdam, Netherlands
| | - Mireille J Serlie
- Department of Endocrinology and Metabolism, Academic Medical Center, Amsterdam, Netherlands.
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28
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Atalayer D. Dürtüsellik ve Aşırı Yeme Arasındaki İlişki: Psikolojik ve Nörobiyolojik Yaklaşımlar. PSIKIYATRIDE GUNCEL YAKLASIMLAR 2018. [DOI: 10.18863/pgy.358090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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29
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Joutsa J, Karlsson HK, Majuri J, Nuutila P, Helin S, Kaasinen V, Nummenmaa L. Binge eating disorder and morbid obesity are associated with lowered mu-opioid receptor availability in the brain. Psychiatry Res Neuroimaging 2018; 276:41-45. [PMID: 29655552 DOI: 10.1016/j.pscychresns.2018.03.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Revised: 01/27/2018] [Accepted: 03/02/2018] [Indexed: 01/17/2023]
Abstract
Both morbid obesity and binge eating disorder (BED) have previously been linked with aberrant brain opioid function. Behaviorally these two conditions are however different suggesting also differences in neurotransmitter function. Here we directly compared mu-opioid receptor (MOR) availability between morbidly obese and BED subjects. Seven BED and nineteen morbidly obese (non-BED) patients, and thirty matched control subjects underwent positron emission tomography (PET) with MOR-specific ligand [11C]carfentanil. Both subjects with morbid obesity and BED had widespread reduction in [11C]carfentanil binding compared to control subjects. However, there was no significant difference in brain MOR binding between subjects with morbid obesity and BED. Thus, our results indicate that there is common brain opioid abnormality in behaviorally different eating disorders involving obesity.
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Affiliation(s)
- Juho Joutsa
- Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Berenson-Allen Center for Noninvasive Brain Stimulation, Beth Israel Deaconess Medical Center, Boston, MA, USA; Department of Neurology, University of Turku, Turku, Finland; Turku PET Centre, University of Turku, Turku, Finland; Division of Clinical Neurosciences, Turku University Hospital, Turku, Finland.
| | | | - Joonas Majuri
- Department of Neurology, University of Turku, Turku, Finland; Turku PET Centre, University of Turku, Turku, Finland
| | - Pirjo Nuutila
- Turku PET Centre, University of Turku, Turku, Finland; Department of Endocrinology, Turku University Hospital, Turku, Finland
| | - Semi Helin
- Turku PET Centre, University of Turku, Turku, Finland
| | - Valtteri Kaasinen
- Department of Neurology, University of Turku, Turku, Finland; Turku PET Centre, University of Turku, Turku, Finland; Division of Clinical Neurosciences, Turku University Hospital, Turku, Finland
| | - Lauri Nummenmaa
- Turku PET Centre, University of Turku, Turku, Finland; Department of Psychology, University of Turku, Turku, Finland
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30
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Gutiérrez-Martos M, Girard B, Mendonça-Netto S, Perroy J, Valjent E, Maldonado R, Martin M. Cafeteria diet induces neuroplastic modifications in the nucleus accumbens mediated by microglia activation. Addict Biol 2018; 23:735-749. [PMID: 28872733 DOI: 10.1111/adb.12541] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 06/22/2017] [Accepted: 06/28/2017] [Indexed: 12/28/2022]
Abstract
High-palatable and caloric foods are widely overconsumed due to hedonic mechanisms that prevail over caloric necessities leading to overeating and overweight. The nucleus accumbens (NAc) is a key brain area modulating the reinforcing effects of palatable foods and is crucially involved in the development of eating disorders. We describe that prolonged exposure to high-caloric chocolate cafeteria diet leads to overeating and overweight in mice. NAc functionality was altered in these mice, presenting structural plasticity modifications in medium spiny neurons, increased expression of neuroinflammatory factors and activated microglia, and abnormal responses after amphetamine-induced hyperlocomotion. Chronic inactivation of microglia normalized these neurobiological and behavioural alterations exclusively in mice exposed to cafeteria diet. Our data suggest that prolonged exposure to cafeteria diet produces neuroplastic and functional changes in the NAc that can modify feeding behaviour. Microglia activation and neuroinflammation play an important role in the development of these neurobiological alterations.
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Affiliation(s)
- Miriam Gutiérrez-Martos
- Laboratory of Neuropharmacology (DCEXS); Parc de Recerca Biomèdica de Barcelona/Universitat Pompeu Fabra (PRBB/UPF); Spain
| | - Benoit Girard
- Pathophysiology of Synaptic Transmission Laboratory; Institut de Génomique Fonctionnelle; France
| | - Sueli Mendonça-Netto
- Laboratory of Neuropharmacology (DCEXS); Parc de Recerca Biomèdica de Barcelona/Universitat Pompeu Fabra (PRBB/UPF); Spain
| | - Julie Perroy
- Pathophysiology of Synaptic Transmission Laboratory; Institut de Génomique Fonctionnelle; France
| | - Emmanuel Valjent
- Inserm U1191, CNRS UMR5203, Laboratory of Neural Circuit and Signal Transduction; University Montpellier; France
| | - Rafael Maldonado
- Laboratory of Neuropharmacology (DCEXS); Parc de Recerca Biomèdica de Barcelona/Universitat Pompeu Fabra (PRBB/UPF); Spain
- IMIM (Hospital del Mar Medical Research Institute); Barcelona Spain
| | - Miquel Martin
- Laboratory of Neuropharmacology (DCEXS); Parc de Recerca Biomèdica de Barcelona/Universitat Pompeu Fabra (PRBB/UPF); Spain
- IMIM (Hospital del Mar Medical Research Institute); Barcelona Spain
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31
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Leigh SJ, Morris MJ. The role of reward circuitry and food addiction in the obesity epidemic: An update. Biol Psychol 2018; 131:31-42. [DOI: 10.1016/j.biopsycho.2016.12.013] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 10/10/2016] [Accepted: 12/15/2016] [Indexed: 12/22/2022]
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32
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Feeding Releases Endogenous Opioids in Humans. J Neurosci 2017; 37:8284-8291. [PMID: 28747384 DOI: 10.1523/jneurosci.0976-17.2017] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 07/06/2017] [Accepted: 07/10/2017] [Indexed: 11/21/2022] Open
Abstract
The endogenous opioid system supports a multitude of functions related to appetitive behavior in humans and animals, and it has been proposed to govern hedonic aspects of feeding thus contributing to the development of obesity. Here we used positron emission tomography to investigate whether feeding results in hedonia-dependent endogenous opioid release in humans. Ten healthy males were recruited for the study. They were scanned with the μ-opioid-specific ligand [11C]carfentanil three times, as follows: after a palatable meal, a nonpalatable meal, and after an overnight fast. Subjective mood, satiety, and circulating hormone levels were measured. Feeding induced significant endogenous opioid release throughout the brain. This response was more pronounced following a nonpalatable meal versus a palatable meal, and independent of the subjective hedonic responses to feeding. We conclude that feeding consistently triggers cerebral opioid release even in the absence of subjective pleasure associated with feeding, suggesting that metabolic and homeostatic rather than exclusively hedonic responses play a role in the feeding-triggered cerebral opioid release.SIGNIFICANCE STATEMENT The endogenous opioid system supports both hedonic and homeostatic functions. It has been proposed that overeating and concomitant opioid release could downregulate opioid receptors and promote the development of obesity. However, it remains unresolved whether feeding leads to endogenous opioid release in humans. We used in vivo positron emission tomography to test whether feeding triggers cerebral opioid release and whether this response is associated with pleasurable sensations. We scanned volunteers using the μ-opioid receptor-specific radioligand [11C]carfentanil three times, as follows: after an overnight fast, after consuming a palatable meal, and after consuming a nonpalatable meal. Feeding led to significant endogenous opioid release, and this occurred also in the absence of feeding-triggered hedonia. Feeding-triggered opioid release thus also reflects metabolic and homeostatic responses rather than hedonic responses exclusively.
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33
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Sellaro R, Colzato LS. High body mass index is associated with impaired cognitive control. Appetite 2017; 113:301-309. [PMID: 28300607 DOI: 10.1016/j.appet.2017.03.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 03/02/2017] [Accepted: 03/08/2017] [Indexed: 01/25/2023]
Abstract
The prevalence of weight problems is increasing worldwide. There is growing evidence that high body mass index (BMI) is associated with frontal lobe dysfunction and cognitive deficits concerning mental flexibility and inhibitory control efficiency. The present study aims at replicating and extending these observations. We compared cognitive control performance of normal weight (BMI < 25) and overweight (BMI ≥ 25) university students on a task tapping either inhibitory control (Experiment 1) or interference control (Experiment 2). Experiment 1 replicated previous findings that found less efficient inhibitory control in overweight individuals. Experiment 2 complemented these findings by showing that cognitive control impairments associated with high BMI also extend to the ability to resolve stimulus-induced response conflict and to engage in conflict-driven control adaptation. The present results are consistent with and extend previous literature showing that high BMI in young, otherwise healthy individuals is associated with less efficient cognitive control functioning.
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Affiliation(s)
- Roberta Sellaro
- Cognitive Psychology Unit & Leiden Institute for Brain and Cognition, Leiden University, Leiden, The Netherlands.
| | - Lorenza S Colzato
- Cognitive Psychology Unit & Leiden Institute for Brain and Cognition, Leiden University, Leiden, The Netherlands
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34
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A meta-analysis of the relationship between brain dopamine receptors and obesity: a matter of changes in behavior rather than food addiction? Int J Obes (Lond) 2016; 40 Suppl 1:S12-21. [PMID: 27001642 PMCID: PMC4819757 DOI: 10.1038/ijo.2016.9] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Addiction to a wide range of substances of abuse has been suggested to reflect a ‘Reward Deficiency Syndrome'. That is, drugs are said to stimulate the reward mechanisms so intensely that, to compensate, the population of dopamine D2 receptors (DD2R) declines. The result is that an increased intake is necessary to experience the same degree of reward. Without an additional intake, cravings and withdrawal symptoms result. A suggestion is that food addiction, in a similar manner to drugs of abuse, decrease DD2R. The role of DD2R in obesity was therefore examined by examining the association between body mass index (BMI) and the Taq1A polymorphism, as the A1 allele is associated with a 30–40% lower number of DD2R, and is a risk factor for drug addiction. If a lower density of DD2R is indicative of physical addiction, it was argued that if food addiction occurs, those with the A1 allele should have a higher BMI. A systematic review found 33 studies that compared the BMI of those who did and did not have the A1 allele. A meta-analysis of the studies compared those with (A1/A1 and A1/A2) or without (A2/A2) the A1 allele; no difference in BMI was found (standardized mean difference 0.004 (s.e. 0.021), variance 0.000, Z=0.196, P<0.845). It was concluded that there was no support for a reward deficiency theory of food addiction. In contrast, there are several reports that those with the A1 allele are less able to benefit from an intervention that aimed to reduce weight, possibly a reflection of increased impulsivity.
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35
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Gaiser EC, Gallezot JD, Worhunsky PD, Jastreboff AM, Pittman B, Kantrovitz L, Angarita GA, Cosgrove KP, Potenza MN, Malison RT, Carson RE, Matuskey D. Elevated Dopamine D 2/3 Receptor Availability in Obese Individuals: A PET Imaging Study with [ 11C](+)PHNO. Neuropsychopharmacology 2016; 41:3042-3050. [PMID: 27374277 PMCID: PMC5101552 DOI: 10.1038/npp.2016.115] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 05/27/2016] [Accepted: 06/27/2016] [Indexed: 01/09/2023]
Abstract
Most prior work with positron emission tomography (PET) dopamine subtype 2/3 receptor (D2/3R) non-selective antagonist tracers suggests that obese (OB) individuals exhibit lower D2/3Rs when compared with normal weight (NW) individuals. A D3-preferring D2/3R agonist tracer, [11C](+)PHNO, has demonstrated that body mass index (BMI) was positively associated with D2/3R availability within striatal reward regions. To date, OB individuals have not been studied with [11C](+)PHNO. We assessed D2/3R availability in striatal and extrastriatal reward regions in 14 OB and 14 age- and gender-matched NW individuals with [11C](+)PHNO PET utilizing a high-resolution research tomograph. Additionally, in regions where group D2/3R differences were observed, secondary analyses of 42 individuals that constituted an overweight cohort was done to study the linear association between BMI and D2/3R availability in those respective regions. A group-by-brain region interaction effect (F7, 182=2.08, p=0.047) was observed. Post hoc analyses revealed that OB individuals exhibited higher tracer binding in D3-rich regions: the substantia nigra/ventral tegmental area (SN/VTA) (+20%; p=0.02), ventral striatum (VST) (+14%; p<0.01), and pallidum (+11%; p=0.02). BMI was also positively associated with D2/3R availability in the SN/VTA (r=0.34, p=0.03), VST (r=0.36, p=0.02), and pallidum (r=0.30, p=0.05) across all subjects. These data suggest that individuals who are obese have higher D2/3R availability in brain reward regions densely populated with D3Rs, potentially identifying a novel pharmacologic target for the treatment of obesity.
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Affiliation(s)
- Edward C Gaiser
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, USA,Department of Psychiatry, Yale University, New Haven, CT, USA
| | | | - Patrick D Worhunsky
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, USA,Department of Psychiatry, Yale University, New Haven, CT, USA
| | - Ania M Jastreboff
- Department of Internal Medicine, Endocrinology, Yale University, New Haven, CT, USA,Department of Pediatrics, Pediatric Endocrinology, Yale University, New Haven, CT, USA
| | - Brian Pittman
- Department of Psychiatry, Yale University, New Haven, CT, USA
| | | | | | - Kelly P Cosgrove
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, USA,Department of Psychiatry, Yale University, New Haven, CT, USA
| | - Marc N Potenza
- Department of Psychiatry, Yale University, New Haven, CT, USA,CASAColumbia and Departments of Neuroscience and Child Study Center, Yale University, New Haven, CT, USA
| | | | - Richard E Carson
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, USA
| | - David Matuskey
- Department of Radiology and Biomedical Imaging, Yale University, New Haven, CT, USA,Department of Psychiatry, Yale University, New Haven, CT, USA,Departments of Psychiatry and Diagnostic Radiology, Yale School of Medicine, 801 Howard Ave, New Haven, CT 06520, USA, Tel: +1 203 737 6316, Fax: +1 203 785 2994, E-mail:
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36
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Karlsson HK, Tuulari JJ, Tuominen L, Hirvonen J, Honka H, Parkkola R, Helin S, Salminen P, Nuutila P, Nummenmaa L. Weight loss after bariatric surgery normalizes brain opioid receptors in morbid obesity. Mol Psychiatry 2016; 21:1057-62. [PMID: 26460230 DOI: 10.1038/mp.2015.153] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 08/05/2015] [Accepted: 08/10/2015] [Indexed: 12/13/2022]
Abstract
Positron emission tomography (PET) studies suggest opioidergic system dysfunction in morbid obesity, while evidence for the role of the dopaminergic system is less consistent. Whether opioid dysfunction represents a state or trait in obesity remains unresolved, but could be assessed in obese subjects undergoing weight loss. Here we measured brain μ-opioid receptor (MOR) and dopamine D2 receptor (D2R) availability in 16 morbidly obese women twice-before and 6 months after bariatric surgery-using PET with [(11)C]carfentanil and [(11)C]raclopride. Data were compared with those from 14 lean control subjects. Receptor-binding potentials (BPND) were compared between the groups and between the pre- and postoperative scans among the obese subjects. Brain MOR availability was initially lower among obese subjects, but weight loss (mean=26.1 kg, s.d.=7.6 kg) reversed this and resulted in ~23% higher MOR availability in the postoperative versus preoperative scan. Changes were observed in areas implicated in reward processing, including ventral striatum, insula, amygdala and thalamus (P's<0.005). Weight loss did not influence D2R availability in any brain region. Taken together, the endogenous opioid system plays an important role in the pathophysiology of human obesity. Because bariatric surgery and concomitant weight loss recover downregulated MOR availability, lowered MOR availability is associated with an obese phenotype and may mediate excessive energy uptake. Our results highlight that understanding the opioidergic contribution to overeating is critical for developing new treatments for obesity.
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Affiliation(s)
- H K Karlsson
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland
| | - J J Tuulari
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland
| | - L Tuominen
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland.,Department of Psychiatry, University of Turku and Turku University Hospital, Turku, Finland
| | - J Hirvonen
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland.,Medical Imaging Centre of Southwest Finland, Turku, Finland.,Department of Radiology, University of Turku and Turku University Hospital, Turku, Finland
| | - H Honka
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland
| | - R Parkkola
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland.,Department of Radiology, University of Turku and Turku University Hospital, Turku, Finland
| | - S Helin
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland
| | - P Salminen
- Department of Digestive Surgery, University of Turku and Turku University Hospital, Turku, Finland
| | - P Nuutila
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland.,Department of Endocrinology, Turku University Hospital, Turku, Finland
| | - L Nummenmaa
- Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland.,Department of Neuroscience and Biomedical Engineering, School of Science, Aalto University, Espoo, Finland.,Department of Psychology, University of Turku, Turku, Finland
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37
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Eisenstein SA, Bogdan R, Love-Gregory L, Corral-Frías NS, Koller JM, Black KJ, Moerlein SM, Perlmutter JS, Barch DM, Hershey T. Prediction of striatal D2 receptor binding by DRD2/ANKK1 TaqIA allele status. Synapse 2016; 70:418-31. [PMID: 27241797 DOI: 10.1002/syn.21916] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 05/26/2016] [Accepted: 05/27/2016] [Indexed: 01/04/2023]
Abstract
In humans, the A1 (T) allele of the dopamine (DA) D2 receptor/ankyrin repeat and kinase domain containing 1 (DRD2/ANKK1) TaqIA (rs1800497) single nucleotide polymorphism has been associated with reduced striatal DA D2/D3 receptor (D2/D3R) availability. However, radioligands used to estimate D2/D3R are displaceable by endogenous DA and are nonselective for D2R, leaving the relationship between TaqIA genotype and D2R specific binding uncertain. Using the positron emission tomography (PET) radioligand, (N-[(11) C]methyl)benperidol ([(11) C]NMB), which is highly selective for D2R over D3R and is not displaceable by endogenous DA, the current study examined whether DRD2/ANKK1 TaqIA genotype predicts D2R specific binding in two independent samples. Sample 1 (n = 39) was composed of obese and nonobese adults; sample 2 (n = 18) was composed of healthy controls, unmedicated individuals with schizophrenia, and siblings of individuals with schizophrenia. Across both samples, A1 allele carriers (A1+) had 5 to 12% less striatal D2R specific binding relative to individuals homozygous for the A2 allele (A1-), regardless of body mass index or diagnostic group. This reduction is comparable to previous PET studies of D2/D3R availability (10-14%). The pooled effect size for the difference in total striatal D2R binding between A1+ and A1- was large (0.84). In summary, in line with studies using displaceable D2/D3R radioligands, our results indicate that DRD2/ANKK1 TaqIA allele status predicts striatal D2R specific binding as measured by D2R-selective [(11) C]NMB. These findings support the hypothesis that DRD2/ANKK1 TaqIA allele status may modify D2R, perhaps conferring risk for certain disease states.
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Affiliation(s)
- Sarah A Eisenstein
- Department of Psychiatry, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Radiology, Washington University in St. Louis, St. Louis, MO, 63110
| | - Ryan Bogdan
- Department of Psychological & Brain Sciences, Washington University in St. Louis, St. Louis, MO, 63130
| | - Latisha Love-Gregory
- Department of Medicine, Washington University in St. Louis, St. Louis, MO, 63110
| | - Nadia S Corral-Frías
- Department of Psychiatry, Washington University in St. Louis, St. Louis, MO, 63110
| | - Jonathan M Koller
- Department of Psychiatry, Washington University in St. Louis, St. Louis, MO, 63110
| | - Kevin J Black
- Department of Psychiatry, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Radiology, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Neurology, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Neuroscience, Washington University in St. Louis, St. Louis, MO, 63110
| | - Stephen M Moerlein
- Department of Radiology, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Biochemistry, Washington University in St. Louis, St. Louis, MO, 63110
| | - Joel S Perlmutter
- Department of Radiology, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Neurology, Washington University in St. Louis, St. Louis, MO, 63110.,Programs in Physical Therapy and Occupational Therapy, Washington University in St. Louis, St. Louis, MO, 63110
| | - Deanna M Barch
- Department of Psychiatry, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Radiology, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Psychological & Brain Sciences, Washington University in St. Louis, St. Louis, MO, 63130
| | - Tamara Hershey
- Department of Psychiatry, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Radiology, Washington University in St. Louis, St. Louis, MO, 63110.,Department of Psychological & Brain Sciences, Washington University in St. Louis, St. Louis, MO, 63130.,Department of Neurology, Washington University in St. Louis, St. Louis, MO, 63110
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39
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Abstract
Obesity is undoubtedly one of the major public health challenges worldwide because of its rapid progression and deleterious effects of associated diseases. The easier access to tasty and energy-dense foods is thought to greatly contribute to this epidemic. Studies also report that obese subjects and animals (rats and mice) preferentially consume foods rich in fat when they can choose. The origin of this eating behavior remains elusive. Over the last decade, the existence of a taste of fat, besides textural and olfactory cues, was supported by a growing number of studies. The existence of a sixth taste modality devoted to the detection/perception of dietary lipids might offer additive information on the quality of food. While the sense of taste is recognized to be a driving-force guiding food choice, interest in the putative relationships between lipids, gustation and obesity is only now emerging. This mini-review will attempt to summarize our current knowledge on this new field of research.
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Affiliation(s)
- Philippe Besnard
- UMR 866 Lipides/Nutrition/Cancer, AgroSup Dijon/INSERM/Univ Bourgogne-Franche Comté, Dijon, France.
- Physiologie de la Nutrition & Toxicologie (NUTox), 1 Esplanade Erasme, 21000, Dijon, France.
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40
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Dang LC, Samanez-Larkin GR, Castrellon JJ, Perkins SF, Cowan RL, Zald DH. Associations between dopamine D2 receptor availability and BMI depend on age. Neuroimage 2016; 138:176-183. [PMID: 27208860 DOI: 10.1016/j.neuroimage.2016.05.044] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/04/2016] [Accepted: 05/17/2016] [Indexed: 10/21/2022] Open
Abstract
OBJECTIVE The dopamine D2/3 receptor subtypes (DRD2/3) are the most widely studied neurotransmitter biomarker in research on obesity, but results to date have been inconsistent, have typically involved small samples, and have rarely accounted for subjects' ages despite the large impact of age on DRD2/3 levels. We aimed to clarify the relation between DRD2/3 availability and BMI by examining this association in a large sample of subjects with BMI spanning the continuum from underweight to extremely obese. SUBJECTS 130 healthy subjects between 18 and 81years old underwent PET with [18F]fallypride, a high affinity DRD2/3 ligand. RESULTS As expected, DRD2/3 availability declined with age. Critically, age significantly interacted with DRD2/3 availability in predicting BMI in the midbrain and striatal regions (caudate, putamen, and ventral striatum). Among subjects under 30years old, BMI was not associated with DRD2/3 availability. By contrast, among subjects over 30years old, BMI was positively associated with DRD2/3 availability in the midbrain, putamen, and ventral striatum. CONCLUSION The present results are incompatible with the prominent dopaminergic hypofunction hypothesis that proposes that a reduction in DRD2/3 availability is associated with increased BMI, and highlights the importance of age in assessing correlates of DRD2/3 function.
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Affiliation(s)
- Linh C Dang
- Department of Psychology, Vanderbilt University, 219 Wilson Hall, 111 21st Avenue South, Nashville, TN 37203, USA.
| | | | - Jaime J Castrellon
- Department of Psychology, Vanderbilt University, 219 Wilson Hall, 111 21st Avenue South, Nashville, TN 37203, USA
| | - Scott F Perkins
- Department of Psychology, Vanderbilt University, 219 Wilson Hall, 111 21st Avenue South, Nashville, TN 37203, USA
| | - Ronald L Cowan
- Department of Psychiatry, Vanderbilt University School of Medicine, 1601 23rd Ave South, Nashville, TN 37212, USA; Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, 1211 Medical Center Drive, Nashville, TN 37232, USA
| | - David H Zald
- Department of Psychology, Vanderbilt University, 219 Wilson Hall, 111 21st Avenue South, Nashville, TN 37203, USA; Department of Psychiatry, Vanderbilt University School of Medicine, 1601 23rd Ave South, Nashville, TN 37212, USA
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41
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Abstract
Theorists have proposed several neural vulnerability factors that may increase overeating and consequent weight gain. Early cross-sectional imaging studies could not determine whether aberrant neural responsivity was a precursor or consequence of overeating. However, recent prospective imaging studies examining predictors of future weight gain and response to obesity treatment, and repeated-measures imaging studies before and after weight gain and loss have advanced knowledge of etiologic processes and neural plasticity resulting from weight change. The present article reviews evidence from prospective studies using imaging and behavioral measures reflecting neural function, as well as randomized experiments with humans and animals that are consistent or inconsistent with 5 neural vulnerability theories for excessive weight gain. Extant data provide strong support for the incentive sensitization theory of obesity and moderate support for the reward surfeit theory, inhibitory control deficit theory, and dynamic vulnerability model of obesity, which attempted to synthesize the former theories into a single etiologic model. However, existing data provide only minimal support for the reward deficit theory. Findings are synthesized into a new working etiologic model that is based on current scientific knowledge. Important directions for future studies, which have the potential to support or refute this working etiologic model, are delineated. (PsycINFO Database Record
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42
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Abstract
Obesity has reached epidemic prevalence, and much research has focused on homeostatic and nonhomeostatic mechanisms underlying overconsumption of food. Mesocorticolimbic circuitry, including dopamine neurons of the ventral tegmental area (VTA), is a key substrate for nonhomeostatic feeding. The goal of the present review is to compare changes in mesolimbic dopamine function in human obesity with diet-induced obesity in rodents. Additionally, we will review the literature to determine if dopamine signaling is altered with binge eating disorder in humans or binge eating modeled in rodents. Finally, we assess modulation of dopamine neurons by neuropeptides and peripheral peptidergic signals that occur with obesity or binge eating. We find that while decreased dopamine concentration is observed with obesity, there is inconsistency outside the human literature on the relationship between striatal D2 receptor expression and obesity. Finally, few studies have explored how orexigenic or anorexigenic peptides modulate dopamine neuronal activity or striatal dopamine in obese models. However, ghrelin modulation of dopamine neurons may be an important factor for driving binge feeding in rodents.
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43
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Schulte EM, Yokum S, Potenza MN, Gearhardt AN. Neural systems implicated in obesity as an addictive disorder: from biological to behavioral mechanisms. PROGRESS IN BRAIN RESEARCH 2015; 223:329-46. [PMID: 26806784 DOI: 10.1016/bs.pbr.2015.07.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Contributing factors to obesity have been identified, yet prevention and treatment efforts have had limited long-term success. It has recently been suggested that some individuals may experience an addictive-like response to certain foods, such as losing control over consumption and continued consumption despite negative consequences. In support, shared biological and behavioral features seem to exist between "food addiction" and traditional substance-use disorders. "Food addiction" may be another important contributor to obesity. The current chapter reviews existing literature regarding neural systems implicated similarly in obesity and addiction, discusses unique considerations for addictive-like eating, and proposes directions for future research regarding "food addiction" as an emerging construct for addiction medicine.
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Affiliation(s)
- Erica M Schulte
- Department of Psychology, University of Michigan, Ann Arbor, MI, USA
| | | | - Marc N Potenza
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA; Department of Neurobiology, Child Study Center, Yale University School of Medicine, New Haven, CT, USA; CASAColumbia, Yale University School of Medicine, New Haven, CT, USA
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44
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Eisenstein SA, Gredysa DM, Antenor–Dorsey JA, Green L, Arbeláez AM, Koller JM, Black KJ, Perlmutter JS, Moerlein SM, Hershey T. Insulin, Central Dopamine D2 Receptors, and Monetary Reward Discounting in Obesity. PLoS One 2015; 10:e0133621. [PMID: 26192187 PMCID: PMC4507849 DOI: 10.1371/journal.pone.0133621] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 06/30/2015] [Indexed: 12/19/2022] Open
Abstract
Animal research finds that insulin regulates dopamine signaling and reward behavior, but similar research in humans is lacking. We investigated whether individual differences in body mass index, percent body fat, pancreatic β-cell function, and dopamine D2 receptor binding were related to reward discounting in obese and non-obese adult men and women. Obese (n = 27; body mass index>30) and non-obese (n = 20; body mass index<30) adults were assessed for percent body fat with dual-energy X-ray absorptiometry and for β-cell function using disposition index. Choice of larger, but delayed or less certain, monetary rewards relative to immediate, certain smaller monetary rewards was measured using delayed and probabilistic reward discounting tasks. Positron emission tomography using a non-displaceable D2-specific radioligand, [11C](N-methyl)benperidol quantified striatal D2 receptor binding. Groups differed in body mass index, percent body fat, and disposition index, but not in striatal D2 receptor specific binding or reward discounting. Higher percent body fat in non-obese women related to preference for a smaller, certain reward over a larger, less likely one (greater probabilistic discounting). Lower β-cell function in the total sample and lower insulin sensitivity in obese related to stronger preference for an immediate and smaller monetary reward over delayed receipt of a larger one (greater delay discounting). In obese adults, higher striatal D2 receptor binding related to greater delay discounting. Interestingly, striatal D2 receptor binding was not significantly related to body mass index, percent body fat, or β-cell function in either group. Our findings indicate that individual differences in percent body fat, β-cell function, and striatal D2 receptor binding may each contribute to altered reward discounting behavior in non-obese and obese individuals. These results raise interesting questions about whether and how striatal D2 receptor binding and metabolic factors, including β-cell function, interact to affect reward discounting in humans.
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Affiliation(s)
- Sarah A. Eisenstein
- Psychiatry Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Radiology Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Danuta M. Gredysa
- Psychology Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Jo Ann Antenor–Dorsey
- Psychiatry Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Leonard Green
- Psychology Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Ana Maria Arbeláez
- Pediatrics Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Jonathan M. Koller
- Psychiatry Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Kevin J. Black
- Psychiatry Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Radiology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Neurology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Anatomy and Neurobiology Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Joel S. Perlmutter
- Radiology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Neurology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Anatomy and Neurobiology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Programs in Physical Therapy and Occupational Therapy, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Stephen M. Moerlein
- Radiology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Biochemistry and Molecular Biophysics Department, Washington University in St. Louis, St. Louis, MO, United States of America
| | - Tamara Hershey
- Psychiatry Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Radiology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- Neurology Department, Washington University in St. Louis, St. Louis, MO, United States of America
- * E-mail:
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45
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Ziauddeen H, Alonso-Alonso M, Hill JO, Kelley M, Khan NA. Obesity and the neurocognitive basis of food reward and the control of intake. Adv Nutr 2015; 6:474-86. [PMID: 26178031 PMCID: PMC4496739 DOI: 10.3945/an.115.008268] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
With the rising prevalence of obesity, hedonic eating has become an important theme in obesity research. Hedonic eating is thought to be that driven by the reward of food consumption and not metabolic need, and this has focused attention on the brain reward system and how its dysregulation may cause overeating and obesity. Here, we begin by examining the brain reward system and the evidence for its dysregulation in human obesity. We then consider the issue of how individuals are able to control their hedonic eating in the present obesogenic environment and compare 2 contrasting perspectives on the control of hedonic eating, specifically, enhanced control of intake via higher cognitive control and loss of control over intake as captured by the food addiction model. We conclude by considering what these perspectives offer in terms of directions for future research and for potential interventions to improve control over food intake at the population and the individual levels.
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Affiliation(s)
- Hisham Ziauddeen
- Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom; Wellcome Trust-MRC, Institute of Metabolic Science, Cambridge, United Kingdom; Cambridgeshire and Peterborough Foundation Trust, Cambridge, United Kingdom;
| | - Miguel Alonso-Alonso
- Laboratory of Bariatric and Nutritional Neuroscience, Center for the Study of Nutrition Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA
| | - James O Hill
- Anschutz Health and Wellness Center, University of Colorado, Anschutz Medical Campus, Aurora, CO
| | - Michael Kelley
- Scientific and Regulatory Affairs, Wm. Wrigley Jr. Company, Chicago, IL; and
| | - Naiman A Khan
- Department of Kinesiology and Community Health, University of Illinois, Urbana-Champaign, IL
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46
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Albayrak Ö, Kliewer J, Föcker M, Antel J, Hebebrand J. [Food addiction - substance use disorder or behavioral addiction?]. ZEITSCHRIFT FUR KINDER-UND JUGENDPSYCHIATRIE UND PSYCHOTHERAPIE 2015; 43:173-81; quiz 182-3. [PMID: 26098005 DOI: 10.1024/1422-4917/a000355] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
This article looks at food addiction as a subject situated between psychiatry, neurobiology, nutritional science, internal medicine, food industry, and public health. Essentially, the question is whether or not individual nutritional components can induce physical dependence, similar to the well-known effects of drugs such as alcohol and cocaine, or whether food addiction is rather a behavioral addiction. The literature describes many overlaps as well as differences of substance-based and non-substance-based addiction in both clinical and neurobiological terms. Until recently it was argued that food addiction appears only in the realms of obesity and eating disorders (e.g., binge-eating disorder, BED). Some studies, however, described the prevalence of food addiction symptoms and diagnoses independent of overweight or that they were in subjects who do not fulfill the criteria for BED. This article sums up the controversial discussion about the phenomenological and neurobiological classification of food addiction. Implications of food addiction for children and adolescents as well as public-health-related issues are also discussed.
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Affiliation(s)
- Özgür Albayrak
- 1 Klinik für Kinder- und Jugendpsychiatrie, Psychosomatik und Psychotherapie, Universitätsklinikum Essen
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47
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Eisenstein SA, Bischoff AN, Gredysa DM, Antenor-Dorsey JAV, Koller JM, Al-Lozi A, Pepino MY, Klein S, Perlmutter JS, Moerlein SM, Black KJ, Hershey T. Emotional Eating Phenotype is Associated with Central Dopamine D2 Receptor Binding Independent of Body Mass Index. Sci Rep 2015; 5:11283. [PMID: 26066863 PMCID: PMC4464302 DOI: 10.1038/srep11283] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Accepted: 05/21/2015] [Indexed: 01/11/2023] Open
Abstract
PET studies have provided mixed evidence regarding central D2/D3 dopamine receptor binding and its relationship with obesity as measured by body mass index (BMI). Other aspects of obesity may be more tightly coupled to the dopaminergic system. We characterized obesity-associated behaviors and determined if these related to central D2 receptor (D2R) specific binding independent of BMI. Twenty-two obese and 17 normal-weight participants completed eating- and reward-related questionnaires and underwent PET scans using the D2R-selective and nondisplaceable radioligand (N-[11C]methyl)benperidol. Questionnaires were grouped by domain (eating related to emotion, eating related to reward, non-eating behavior motivated by reward or sensitivity to punishment). Normalized, summed scores for each domain were compared between obese and normal-weight groups and correlated with striatal and midbrain D2R binding. Compared to normal-weight individuals, the obese group self-reported higher rates of eating related to both emotion and reward (p < 0.001), greater sensitivity to punishment (p = 0.06), and lower non-food reward behavior (p < 0.01). Across normal-weight and obese participants, self-reported emotional eating and non-food reward behavior positively correlated with striatal (p < 0.05) and midbrain (p < 0.05) D2R binding, respectively. In conclusion, an emotional eating phenotype may reflect altered central D2R function better than other commonly used obesity-related measures such as BMI.
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Affiliation(s)
- Sarah A Eisenstein
- 1] Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA [2] Departments of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Allison N Bischoff
- Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Danuta M Gredysa
- Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Jo Ann V Antenor-Dorsey
- Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Jonathan M Koller
- Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Amal Al-Lozi
- Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Marta Y Pepino
- Departments of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Samuel Klein
- Departments of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Joel S Perlmutter
- 1] Departments of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA [2] Departments of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA [3] Departments of Anatomy &Neurobiology, Washington University School of Medicine, St. Louis, MO 63110, USA [4] Departments of Physical Therapy, Washington University School of Medicine, St. Louis, MO 63110, USA [5] Departments of Occupational Therapy, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Stephen M Moerlein
- 1] Departments of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA [2] Departments of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Kevin J Black
- 1] Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA [2] Departments of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA [3] Departments of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA [4] Departments of Anatomy &Neurobiology, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Tamara Hershey
- 1] Departments of Psychiatry, Washington University School of Medicine, St. Louis, MO 63110, USA [2] Departments of Radiology, Washington University School of Medicine, St. Louis, MO 63110, USA [3] Departments of Neurology, Washington University School of Medicine, St. Louis, MO 63110, USA
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48
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Obesity is associated with decreased μ-opioid but unaltered dopamine D2 receptor availability in the brain. J Neurosci 2015; 35:3959-65. [PMID: 25740524 DOI: 10.1523/jneurosci.4744-14.2015] [Citation(s) in RCA: 140] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Neurochemical pathways involved in pathological overeating and obesity are poorly understood. Although previous studies have shown increased μ-opioid receptor (MOR) and decreased dopamine D2 receptor (D2R) availability in addictive disorders, the role that these systems play in human obesity still remains unclear. We studied 13 morbidly obese women [mean body mass index (BMI), 42 kg/m(2)] and 14 nonobese age-matched women, and measured brain MOR and D2R availability using PET with selective radioligands [(11)C]carfentanil and [(11)C]raclopride, respectively. We also used quantitative meta-analytic techniques to pool previous evidence on the effects of obesity on altered D2R availability. Morbidly obese subjects had significantly lower MOR availability than control subjects in brain regions relevant for reward processing, including ventral striatum, insula, and thalamus. Moreover, in these areas, BMI correlated negatively with MOR availability. Striatal MOR availability was also negatively associated with self-reported food addiction and restrained eating patterns. There were no significant differences in D2R availability between obese and nonobese subjects in any brain region. Meta-analysis confirmed that current evidence for altered D2R availability in obesity is only modest. Obesity appears to have unique neurobiological underpinnings in the reward circuit, whereby it is more similar to opioid addiction than to other addictive disorders. The opioid system modulates motivation and reward processing, and low μ-opioid availability may promote overeating to compensate decreased hedonic responses in this system. Behavioral and pharmacological strategies for recovering opioidergic function might thus be critical to curb the obesity epidemic.
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49
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Blanco C, García-Anaya M, Wall M, de los Cobos JCP, Swierad E, Wang S, Petry NM. Should pathological gambling and obesity be considered addictive disorders? A factor analytic study in a nationally representative sample. Drug Alcohol Depend 2015; 150:129-34. [PMID: 25769392 PMCID: PMC4387020 DOI: 10.1016/j.drugalcdep.2015.02.018] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 02/17/2015] [Accepted: 02/18/2015] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Pathological gambling (PG) is now aligned with substance use disorders in the DSM-5 as the first officially recognized behavioral addiction. There is growing interest in examining obesity as an addictive disorder as well. The goal of this study was to investigate whether epidemiological data provide support for the consideration of PG and obesity as addictive disorders. METHOD Factor analysis of data from a large, nationally representative sample of US adults (N=43,093), using nicotine dependence, alcohol dependence, drug dependence, PG and obesity as indicators. It was hypothesized that nicotine dependence, alcohol dependence and drug use dependence would load on a single factor. It was further hypothesized that if PG and obesity were addictive disorders, they would load on the same factor as substance use disorders, whereas failure to load on the addictive factor would not support their conceptualization as addictive disorders. RESULTS A model with one factor including nicotine dependence, alcohol dependence, drug dependence and PG, but not obesity, provided a very good fit to the data, as indicated by CFI=0.99, TLI=0.99 and RMSEA=0.01 and loadings of all indicators >0.4. CONCLUSION Data from this study support the inclusion of PG in a latent factor with substance use disorders but do not lend support to the consideration of obesity, as defined by BMI, as an addictive disorder. Future research should investigate whether certain subtypes of obesity are best conceptualized as addictive disorders and the shared biological and environmental factors that account for the common and specific features of addictive disorders.
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Affiliation(s)
- Carlos Blanco
- Department of Psychiatry, New York State Psychiatric Institute, Columbia University, New York, NY 10032, USA.
| | - María García-Anaya
- Department of Psychiatry, New York State Psychiatric Institute/Columbia University,Clinical Research Division, National Institute of Psychiatry Ramón de la Fuente, Mexico City
| | - Melanie Wall
- Department of Psychiatry, New York State Psychiatric Institute/Columbia University,Department of Biostatistics, New York State Psychiatric Institute/Columbia University
| | - José Carlos Pérez de los Cobos
- Addictive Behaviors Unit, Department of Psychiatry, Hospital de la Santa Creu i Sant Pau, Biomedical Research Institute Sant Pau, (IIB Sant Pau) Departament de Psiguiatria i Medicina Legal, Universitat Autonoma de Barcelona, Barcelona, Spain
| | - Ewelina Swierad
- Department of Psychiatry, New York State Psychiatric Institute/Columbia University
| | - Shuai Wang
- Department of Psychiatry, New York State Psychiatric Institute/Columbia University
| | - Nancy M. Petry
- Calhoun Cardiology Center, University of Connecticut Health Center
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50
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Val-Laillet D, Aarts E, Weber B, Ferrari M, Quaresima V, Stoeckel L, Alonso-Alonso M, Audette M, Malbert C, Stice E. Neuroimaging and neuromodulation approaches to study eating behavior and prevent and treat eating disorders and obesity. Neuroimage Clin 2015; 8:1-31. [PMID: 26110109 PMCID: PMC4473270 DOI: 10.1016/j.nicl.2015.03.016] [Citation(s) in RCA: 278] [Impact Index Per Article: 30.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 03/18/2015] [Accepted: 03/19/2015] [Indexed: 12/11/2022]
Abstract
Functional, molecular and genetic neuroimaging has highlighted the existence of brain anomalies and neural vulnerability factors related to obesity and eating disorders such as binge eating or anorexia nervosa. In particular, decreased basal metabolism in the prefrontal cortex and striatum as well as dopaminergic alterations have been described in obese subjects, in parallel with increased activation of reward brain areas in response to palatable food cues. Elevated reward region responsivity may trigger food craving and predict future weight gain. This opens the way to prevention studies using functional and molecular neuroimaging to perform early diagnostics and to phenotype subjects at risk by exploring different neurobehavioral dimensions of the food choices and motivation processes. In the first part of this review, advantages and limitations of neuroimaging techniques, such as functional magnetic resonance imaging (fMRI), positron emission tomography (PET), single photon emission computed tomography (SPECT), pharmacogenetic fMRI and functional near-infrared spectroscopy (fNIRS) will be discussed in the context of recent work dealing with eating behavior, with a particular focus on obesity. In the second part of the review, non-invasive strategies to modulate food-related brain processes and functions will be presented. At the leading edge of non-invasive brain-based technologies is real-time fMRI (rtfMRI) neurofeedback, which is a powerful tool to better understand the complexity of human brain-behavior relationships. rtfMRI, alone or when combined with other techniques and tools such as EEG and cognitive therapy, could be used to alter neural plasticity and learned behavior to optimize and/or restore healthy cognition and eating behavior. Other promising non-invasive neuromodulation approaches being explored are repetitive transcranial magnetic stimulation (rTMS) and transcranial direct-current stimulation (tDCS). Converging evidence points at the value of these non-invasive neuromodulation strategies to study basic mechanisms underlying eating behavior and to treat its disorders. Both of these approaches will be compared in light of recent work in this field, while addressing technical and practical questions. The third part of this review will be dedicated to invasive neuromodulation strategies, such as vagus nerve stimulation (VNS) and deep brain stimulation (DBS). In combination with neuroimaging approaches, these techniques are promising experimental tools to unravel the intricate relationships between homeostatic and hedonic brain circuits. Their potential as additional therapeutic tools to combat pharmacorefractory morbid obesity or acute eating disorders will be discussed, in terms of technical challenges, applicability and ethics. In a general discussion, we will put the brain at the core of fundamental research, prevention and therapy in the context of obesity and eating disorders. First, we will discuss the possibility to identify new biological markers of brain functions. Second, we will highlight the potential of neuroimaging and neuromodulation in individualized medicine. Third, we will introduce the ethical questions that are concomitant to the emergence of new neuromodulation therapies.
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Key Words
- 5-HT, serotonin
- ADHD, attention deficit hyperactivity disorder
- AN, anorexia nervosa
- ANT, anterior nucleus of the thalamus
- B N, bulimia nervosa
- BAT, brown adipose tissue
- BED, binge eating disorder
- BMI, body mass index
- BOLD, blood oxygenation level dependent
- BS, bariatric surgery
- Brain
- CBF, cerebral blood flow
- CCK, cholecystokinin
- Cg25, subgenual cingulate cortex
- DA, dopamine
- DAT, dopamine transporter
- DBS, deep brain stimulation
- DBT, deep brain therapy
- DTI, diffusion tensor imaging
- ED, eating disorders
- EEG, electroencephalography
- Eating disorders
- GP, globus pallidus
- HD-tDCS, high-definition transcranial direct current stimulation
- HFD, high-fat diet
- HHb, deoxygenated-hemoglobin
- Human
- LHA, lateral hypothalamus
- MER, microelectrode recording
- MRS, magnetic resonance spectroscopy
- Nac, nucleus accumbens
- Neuroimaging
- Neuromodulation
- O2Hb, oxygenated-hemoglobin
- OCD, obsessive–compulsive disorder
- OFC, orbitofrontal cortex
- Obesity
- PD, Parkinson's disease
- PET, positron emission tomography
- PFC, prefrontal cortex
- PYY, peptide tyrosine tyrosine
- SPECT, single photon emission computed tomography
- STN, subthalamic nucleus
- TMS, transcranial magnetic stimulation
- TRD, treatment-resistant depression
- VBM, voxel-based morphometry
- VN, vagus nerve
- VNS, vagus nerve stimulation
- VS, ventral striatum
- VTA, ventral tegmental area
- aCC, anterior cingulate cortex
- dTMS, deep transcranial magnetic stimulation
- daCC, dorsal anterior cingulate cortex
- dlPFC, dorsolateral prefrontal cortex
- fMRI, functional magnetic resonance imaging
- fNIRS, functional near-infrared spectroscopy
- lPFC, lateral prefrontal cortex
- pCC, posterior cingulate cortex
- rCBF, regional cerebral blood flow
- rTMS, repetitive transcranial magnetic stimulation
- rtfMRI, real-time functional magnetic resonance imaging
- tACS, transcranial alternate current stimulation
- tDCS, transcranial direct current stimulation
- tRNS, transcranial random noise stimulation
- vlPFC, ventrolateral prefrontal cortex
- vmH, ventromedial hypothalamus
- vmPFC, ventromedial prefrontal cortex
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Affiliation(s)
| | - E. Aarts
- Radboud University, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, The Netherlands
| | - B. Weber
- Department of Epileptology, University Hospital Bonn, Germany
| | - M. Ferrari
- Department of Life, Health and Environmental Sciences, University of L'Aquila, Italy
| | - V. Quaresima
- Department of Life, Health and Environmental Sciences, University of L'Aquila, Italy
| | - L.E. Stoeckel
- Massachusetts General Hospital, Harvard Medical School, USA
| | - M. Alonso-Alonso
- Beth Israel Deaconess Medical Center, Harvard Medical School, USA
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