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Estival S, Chevalère J, Laurier V, Mourre F, Tricot J, Postal V. Study of the deficit in planning abilities of adults with Prader-Willi Syndrome. RESEARCH IN DEVELOPMENTAL DISABILITIES 2021; 117:104056. [PMID: 34371306 DOI: 10.1016/j.ridd.2021.104056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 07/20/2021] [Accepted: 08/01/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Prader-Willi syndrome (PWS) is a complex developmental genetic disorder associated with intellectual disability and deficits in executive functions which result in disorganisation and poor personal autonomy. AIMS This study aimed to determine impairments in planning skills of adults with PWS, in relation with their intellectual disabilities, as well as the influence of food compulsions on their performance. METHODS AND PROCEDURES A modified version of the Zoo Map from the Behavioural Assessment of the Dysexecutive Syndrome was used in three groups: a group of adults with PWS in comparison with two groups both matched on chronological age, one with typical development (TD) and one with intellectual disability (ID). OUTCOMES AND RESULTS Compared to TD adults, both adults with PWS and ID showed increased planning time and lower raw scores on the planning task. The execution time and the number of errors were higher in the PWS group compared to the comparison groups. All three groups performed worse in the non-food condition only for number of errors and raw score. CONCLUSIONS AND IMPLICATIONS Planning abilities were impaired in PWS adults. Results also showed that intellectual level plays a role in participants' performance. These findings are essential to understand the difficulties of people with PWS daily life.
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Affiliation(s)
- Séverine Estival
- Laboratoire de Psychologie LabPsy EA4139, Université de Bordeaux, France.
| | - Johann Chevalère
- Laboratoire de Psychologie LabPsy EA4139, Université de Bordeaux, France
| | | | - Fabien Mourre
- Hôpital Marin AP-HP, Unité Prader-Willi, Hendaye, France
| | - Julie Tricot
- Hôpital Marin AP-HP, Unité Prader-Willi, Hendaye, France
| | - Virginie Postal
- Laboratoire de Psychologie LabPsy EA4139, Université de Bordeaux, France
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Biased signaling: A viable strategy to drug ghrelin receptors for the treatment of obesity. Cell Signal 2021; 83:109976. [PMID: 33713808 DOI: 10.1016/j.cellsig.2021.109976] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 02/23/2021] [Accepted: 03/08/2021] [Indexed: 02/07/2023]
Abstract
Obesity is a global burden and a chronic ailment with damaging overall health effects. Ghrelin, an octanoylated 28 amino acid peptide hormone, is secreted from the oxyntic mucosa of the stomach. Ghrelin acts on regions of the hypothalamus to regulate feeding behavior and glucose homeostasis through its G protein-coupled receptor. Recently, several central pathways modulating the metabolic actions of ghrelin have been reported. While these signaling pathways can be inhibited or activated by antagonists or agonists, they can also be discriminatingly activated in a "biased" response to impart different degrees of activation in distinct pathways downstream of the receptor. Here, we review recent ghrelin biased signaling findings as well as characteristics of ghrelin hormone and its receptors pertinent for biased signaling. We then evaluate the feasibility for ghrelin receptor biased signaling as a strategy for the development of effective pharmacotherapy in obesity treatment.
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Martínez Michel L, Haqq AM, Wismer WV. A review of chemosensory perceptions, food preferences and food-related behaviours in subjects with Prader-Willi Syndrome. Appetite 2015; 99:17-24. [PMID: 26713776 DOI: 10.1016/j.appet.2015.12.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 12/10/2015] [Accepted: 12/19/2015] [Indexed: 10/22/2022]
Abstract
Hyperphagia and obsessive preoccupation with food are hallmark characteristics of Prader-Willi Syndrome (PWS). Although hyperphagia in PWS is linked to hypothalamic dysfunction, the underlying mechanisms behind this problem are poorly understood. Moreover, our understanding of how chemosensory perceptions and food choice/preferences relate to hyperphagia in individuals with PWS is very limited. This narrative review synthesizes studies that assessed chemosensory perceptions, food choices and food-related behaviours in PWS individuals and highlights knowledge gaps in research for further exploration. Twenty seven publications from relevant databases met inclusion criteria and were organized thematically by study technique in the review. Results suggested that PWS individuals have consistent preferences for sweet tastes and in most studies have exhibited a preference for calorie-dense foods over lower calorie foods. No firm conclusions were drawn concerning the chemosensory perceptions of PWS individuals and their influence on food preferences or choices; chemosensation among PWS individuals is an understudied topic. Current evidence suggests that eating behaviour in PWS is a complex phenomenon that involves a dysfunctional satiation and not excessive hunger. Food preferences, choices, and related behaviours and the impact of these on obesity management in those with PWS remain poorly understood and require further study using validated tools and methodologies.
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Affiliation(s)
- Lorelei Martínez Michel
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture Forestry Centre, University of Alberta, Edmonton, AB T6G 2P5, Canada
| | - Andrea M Haqq
- Department of Pediatrics, 4-511 Edmonton Clinic Health Academy, University of Alberta, Edmonton, AB T6G 1C9, Canada
| | - Wendy V Wismer
- Department of Agricultural, Food and Nutritional Science, 4-10 Agriculture Forestry Centre, University of Alberta, Edmonton, AB T6G 2P5, Canada.
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Uchida A, Zigman JM, Perelló M. Ghrelin and eating behavior: evidence and insights from genetically-modified mouse models. Front Neurosci 2013; 7:121. [PMID: 23882175 PMCID: PMC3712270 DOI: 10.3389/fnins.2013.00121] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 06/25/2013] [Indexed: 01/08/2023] Open
Abstract
Ghrelin is an octanoylated peptide hormone, produced by endocrine cells of the stomach, which acts in the brain to increase food intake and body weight. Our understanding of the mechanisms underlying ghrelin's effects on eating behaviors has been greatly improved by the generation and study of several genetically manipulated mouse models. These models include mice overexpressing ghrelin and also mice with genetic deletion of ghrelin, the ghrelin receptor [the growth hormone secretagogue receptor (GHSR)] or the enzyme that post-translationally modifies ghrelin [ghrelin O-acyltransferase (GOAT)]. In addition, a GHSR-null mouse model in which GHSR transcription is globally blocked but can be cell-specifically reactivated in a Cre recombinase-mediated fashion has been generated. Here, we summarize findings obtained with these genetically manipulated mice, with the aim to highlight the significance of the ghrelin system in the regulation of both homeostatic and hedonic eating, including that occurring in the setting of chronic psychosocial stress.
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Affiliation(s)
- Aki Uchida
- Divisions of Hypothalamic Research and Endocrinology and Metabolism, Department of Medicine, The University of Texas Southwestern Medical Center Dallas, TX, USA ; Department of Psychiatry, The University of Texas Southwestern Medical Center Dallas, TX, USA
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Vicario CM, Kritikos A, Avenanti A, Rafal R. Reward and punishment: investigating cortico-bulbar excitability to disclose the value of goods. Front Psychol 2013; 4:39. [PMID: 23386841 PMCID: PMC3564061 DOI: 10.3389/fpsyg.2013.00039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Accepted: 01/16/2013] [Indexed: 11/23/2022] Open
Affiliation(s)
- Carmelo M. Vicario
- School of Psychology, University of QueenslandBrisbane, QLD, Australia
- Faculty of Motor Science, University of PalermoPalermo, Italy
| | - Ada Kritikos
- School of Psychology, University of QueenslandBrisbane, QLD, Australia
| | - Alessio Avenanti
- Department of Psychology, University of Bologna “Alma Mater Studiorum,”Bologna, Italy
- Centro di Studi e Ricerche in Neuroscienze Cognitive, Polo Scientifico-Didattico di CesenaCesena, Italy
- Istituto Di Ricovero e Cura a Carattere Scientifico, Fondazione Santa LuciaRoma, Italy
| | - Robert Rafal
- School of Psychology, Univerisity of WalesBangor, UK
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Johnson AW. Eating beyond metabolic need: how environmental cues influence feeding behavior. Trends Neurosci 2013; 36:101-9. [DOI: 10.1016/j.tins.2013.01.002] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 01/07/2013] [Indexed: 01/05/2023]
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Dichter GS, Damiano CA, Allen JA. Reward circuitry dysfunction in psychiatric and neurodevelopmental disorders and genetic syndromes: animal models and clinical findings. J Neurodev Disord 2012; 4:19. [PMID: 22958744 PMCID: PMC3464940 DOI: 10.1186/1866-1955-4-19] [Citation(s) in RCA: 199] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Accepted: 05/02/2012] [Indexed: 02/07/2023] Open
Abstract
This review summarizes evidence of dysregulated reward circuitry function in a range of neurodevelopmental and psychiatric disorders and genetic syndromes. First, the contribution of identifying a core mechanistic process across disparate disorders to disease classification is discussed, followed by a review of the neurobiology of reward circuitry. We next consider preclinical animal models and clinical evidence of reward-pathway dysfunction in a range of disorders, including psychiatric disorders (i.e., substance-use disorders, affective disorders, eating disorders, and obsessive compulsive disorders), neurodevelopmental disorders (i.e., schizophrenia, attention-deficit/hyperactivity disorder, autism spectrum disorders, Tourette's syndrome, conduct disorder/oppositional defiant disorder), and genetic syndromes (i.e., Fragile X syndrome, Prader-Willi syndrome, Williams syndrome, Angelman syndrome, and Rett syndrome). We also provide brief overviews of effective psychopharmacologic agents that have an effect on the dopamine system in these disorders. This review concludes with methodological considerations for future research designed to more clearly probe reward-circuitry dysfunction, with the ultimate goal of improved intervention strategies.
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Affiliation(s)
- Gabriel S Dichter
- Carolina Institute for Developmental Disabilities, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC, USA
- Department of Psychiatry, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, NC, USA
- Department of Psychology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Psychiatry, University of North Carolina School of Medicine, CB# 7255, 101 Manning Drive, Chapel Hill, NC, 275997255, USA
| | - Cara A Damiano
- Department of Psychology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - John A Allen
- Neuroscience Research Unit Pfizer Global Research and Development, Groton, CT 06340, USA
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Relkovic D, Isles AR. Behavioural and cognitive profiles of mouse models for Prader-Willi syndrome. Brain Res Bull 2011; 92:41-8. [PMID: 21971015 DOI: 10.1016/j.brainresbull.2011.09.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 08/25/2011] [Accepted: 09/09/2011] [Indexed: 12/25/2022]
Abstract
Prader-Willi syndrome (PWS) is a neurodevelopmental disorder with aspects of psychiatric illness caused by genetic mutations at chromosome 15q11-q13. In addition to causing PWS, this interval is also thought to be of importance more generally in the development of autism and psychotic illness. The PWS genetic interval is conserved in mammals, and consequently mice carrying genetic manipulations affecting one or all of the genes in the region of conserved synteny have been generated and used in neurobehavioural studies. Here we give an overview of these models and describe the behavioural and neurobiological analyses that have been performed, many of which have provide new insights into the molecular and neural processes influenced by genes within the PWS interval.
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Affiliation(s)
- Dinko Relkovic
- Mediterranean Institute for Life Sciences, Mestrovicevo setaliste bb, 21000 Split, Croatia
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Abstract
Prader-Willi syndrome (PWS) is a multifaceted developmental disorder most commonly associated with extreme hyperphagia and life-threatening obesity. PWS is a genetic disorder of imprinting with almost all cases occurring spontaneously. Behavioural and imaging studies have shown that obesity in PWS arises from overeating driven by a faulty satiety mechanism which manifests as an almost permanent state similar to starvation. With no available treatments, management of the eating behaviour is the only option and has two main strategies: restrict access to food and distract thoughts from food. In this mini review, which we have aimed at clinicians, we outline the main aspects of PWS including genetics, development of the eating behaviour and best practice approaches to management.
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Affiliation(s)
- C J McAllister
- Cambridge Intellectual and Developmental Disabilities Research Group, Department of Psychiatry, University of Cambridge, Cambridge, UK
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Spendelow JS. Assessment of Behavioral and Psychiatric Problems in People With Prader–Willi Syndrome: A Review of the Literature. JOURNAL OF POLICY AND PRACTICE IN INTELLECTUAL DISABILITIES 2011. [DOI: 10.1111/j.1741-1130.2011.00296.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shore DM, Rafal R, Parkinson JA. Appetitive motivational deficits in individuals with Parkinson's disease. Mov Disord 2011; 26:1887-92. [PMID: 21520287 DOI: 10.1002/mds.23736] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Revised: 02/27/2011] [Accepted: 03/08/2011] [Indexed: 01/09/2023] Open
Abstract
Parkinson's disease is known for its effects on sensorimotor coordination caused by degeneration of the nigrostriatal dopamine pathway. Dopamine-innervated areas of the ventral striatum also become compromised in Parkinson's disease, and little is known about the potential impact of this pathology on motivational processes mediated by the mesolimbic dopamine system. The current study tested the hypothesis that patients with Parkinson's disease would show a deficit in appetitive motivational arousal. Patients with Parkinson's disease and age-matched healthy controls completed a visual discrimination task in which control and appetitive food images (incidental to the task) were presented in the background. Response rate changes indicated appetitive motivational arousal. The healthy controls showed an increase in response rate on the task when appetitive food cues were present compared with control stimuli. In contrast, the Parkinson's disease group showed an inverse pattern to the healthy controls. The reduction in appetitive motivation correlated with an individual's Parkinsonian symptomology. Patients with Parkinson's disease demonstrated an impairment in appetitive motivational arousal consistent with the progression of dopaminergic degeneration across the course of the disease. Dysfunction of this system affects quality of life in Parkinson's disease, and a blunting of the anticipatory motivation may contribute to the high prevalence of depression in Parkinson's disease.
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Miller JL, Lynn CH, Driscoll DC, Goldstone AP, Gold JA, Kimonis V, Dykens E, Butler MG, Shuster JJ, Driscoll DJ. Nutritional phases in Prader-Willi syndrome. Am J Med Genet A 2011; 155A:1040-9. [PMID: 21465655 DOI: 10.1002/ajmg.a.33951] [Citation(s) in RCA: 267] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2010] [Accepted: 01/25/2011] [Indexed: 11/10/2022]
Abstract
Prader-Willi syndrome (PWS) is a complex neurobehavioral condition which has been classically described as having two nutritional stages: poor feeding, frequently with failure to thrive (FTT) in infancy (Stage 1), followed by hyperphagia leading to obesity in later childhood (Stage 2). We have longitudinally followed the feeding behaviors of individuals with PWS and found a much more gradual and complex progression of the nutritional phases than the traditional two stages described in the literature. Therefore, this study characterizes the growth, metabolic, and laboratory changes associated with the various nutritional phases of PWS in a large cohort of subjects. We have identified a total of seven different nutritional phases, with five main phases and sub-phases in phases 1 and 2. Phase 0 occurs in utero, with decreased fetal movements and growth restriction compared to unaffected siblings. In phase 1 the infant is hypotonic and not obese, with sub-phase 1a characterized by difficulty feeding with or without FTT (ages birth-15 months; median age at completion: 9 months). This phase is followed by sub-phase 1b when the infant grows steadily along a growth curve and weight is increasing at a normal rate (median age of onset: 9 months; age quartiles 5-15 months). Phase 2 is associated with weight gain-in sub-phase 2a the weight increases without a significant change in appetite or caloric intake (median age of onset 2.08 years; age quartiles 20-31 months;), while in sub-phase 2b the weight gain is associated with a concomitant increased interest in food (median age of onset: 4.5 years; quartiles 3-5.25 years). Phase 3 is characterized by hyperphagia, typically accompanied by food-seeking and lack of satiety (median age of onset: 8 years; quartiles 5-13 years). Some adults progress to phase 4 which is when an individual who was previously in phase 3 no longer has an insatiable appetite and is able to feel full. Therefore, the progression of the nutritional phases in PWS is much more complex than previously recognized. Awareness of the various phases will aid researchers in unraveling the pathophysiology of each phase and provide a foundation for developing rational therapies. Counseling parents of newly diagnosed infants with PWS as to what to expect with regard to these nutritional phases may help prevent or slow the early-onset of obesity in this syndrome.
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Affiliation(s)
- Jennifer L Miller
- Department of Pediatrics, College of Medicine, University of Florida, Gainesville, 32610-0296, USA
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