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Neuronal Signal Transduction-Involved Genes in Pig Hypothalamus Affect Feed Efficiency as Revealed by Transcriptome Analysis. BIOMED RESEARCH INTERNATIONAL 2018; 2018:5862571. [PMID: 30687750 PMCID: PMC6327278 DOI: 10.1155/2018/5862571] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 11/14/2018] [Indexed: 01/08/2023]
Abstract
Feed efficiency (FE) is an important trait affecting costs in swine industry. Investigation on FE-related genes in different tissues is valuable for molecular breeding. Hypothalamus is a convergent and integrated centre for multiple nutrient-related signals. The present study identified 363 differentially expressed (DE) genes and 14 DE lincRNAs in the hypothalamus of high- and low-FE Yorkshire pigs. Furthermore, 983 significantly correlated DE gene-lincRNA pairs were identified through weighted correlation network analysis (WGCNA) and Pearson correlation analysis. These DE genes were primarily enriched in the neuronal signal transduction process containing the upregulated genes of VIPR1, CCR1, CCR5, LEPR, INSR, ADRA1A, CCKAR, and ADORA3 and the downregulated genes of GRM1, GRM4, GRM5, and VIPR2, which were located in the cell membrane. These signal receptors were mainly connected to downstream Jak-STAT signaling that involved the increased genes (JAK2, STAT3, and POMC) and mTOR signaling pathway, including the decreased genes (CAMKK2, AMPK, and MTOR). STAT3 and AMPK genes also played a role in two major hypothalamic neurons of POMC and NPY/AGRP. A total of eight DE lincRNAs also participated in the potential network. In conclusion, neuronal signaling transduction-involved genes and lincRNAs were related to FE variation in pig hypothalamus.
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Choi JS. Effects of Maternal and Post-Weaning High-Fat Diet on Leptin Resistance and Hypothalamic Appetite Genes in Sprague Dawley Rat Offspring. Clin Nutr Res 2018; 7:276-290. [PMID: 30406057 PMCID: PMC6209730 DOI: 10.7762/cnr.2018.7.4.276] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 09/11/2018] [Accepted: 09/16/2018] [Indexed: 01/13/2023] Open
Abstract
The defective satiation signaling may contribute to the etiology of obesity. We investigated how dietary modification during maternal (pregnancy and lactation) and post-weaning affects obesity, insulin resistance (IR) and hypothalamic appetite responses in offspring in adulthood. Pregnant female SD rats were randomly allocated to either maternal high-fat diet (43% energy from fat) or control diet (12% energy from fat) until the end of suckling. After weaning for additional 4 weeks, half of the offsprings were continuously fed the same diet as the dam (C-C and H-H groups); the remainder received the counterpart diet (C-H and H-C groups). The long-term high-fat diet during maternal and post-weaning period (H-H group) led to susceptibility to obesity and IR through the significant increases of hypothalamic orexigenic genes compared to the maternal and post-weaning control diet group (C-C group). In contrast, the hypothalamic expression levels of anorexigenic genes, apolipoprotein E, leptin receptor, and activated signal transducer and activator of transcription protein 3 were significantly lower in H-H group with elevations in circulating insulin and leptin and body fat mass. However, dietary changes after weaning (H-C and C-H groups) partially modified these conditions. These results suggest that maternal and post-weaning diet conditions can potentially disrupt hypothalamic neuronal signal irrelevantly, which is essential for leptin's regulation of energy homeostasis and induce the risk of offspring to future metabolic disorders.
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Affiliation(s)
- Joo Sun Choi
- Department of Home Economics, College of Education, Kyungnam University, Changwon 51767, Korea
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53
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López-Lluch G, Hernández-Camacho JD, Fernández-Ayala DJM, Navas P. Mitochondrial dysfunction in metabolism and ageing: shared mechanisms and outcomes? Biogerontology 2018; 19:461-480. [PMID: 30143941 DOI: 10.1007/s10522-018-9768-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 08/21/2018] [Indexed: 12/15/2022]
Abstract
Mitochondria are key in the metabolism of aerobic organisms and in ageing progression and age-related diseases. Mitochondria are essential for obtaining ATP from glucose and fatty acids but also in many other essential functions in cells including aminoacids metabolism, pyridine synthesis, phospholipid modifications and calcium regulation. On the other hand, the activity of mitochondria is also the principal source of reactive oxygen species in cells. Ageing and chronic age-related diseases are associated with the deregulation of cell metabolism and dysfunction of mitochondria. Cell metabolism is controlled by three major nutritional sensors: mTOR, AMPK and Sirtuins. These factors control mitochondrial biogenesis and dynamics by regulating fusion, fission and turnover through mito- and autophagy. A complex interaction between the activity of these nutritional sensors, mitochondrial biogenesis rate and dynamics exists and affect ageing, age-related diseases including metabolic disease. Further, mitochondria maintain a constant communication with nucleus modulating gene expression and modifying epigenetics. In this review we highlight the importance of mitochondria in ageing and the repercussion in the progression of age-related diseases and metabolic disease.
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Affiliation(s)
- Guillermo López-Lluch
- Centro Andaluz de Biología del Desarrollo, CABD-CSIC, CIBERER, Instituto de Salud Carlos III, Universidad Pablo de Olavide, Carretera de Utrera km. 1, 41013, Seville, Spain.
| | - Juan Diego Hernández-Camacho
- Centro Andaluz de Biología del Desarrollo, CABD-CSIC, CIBERER, Instituto de Salud Carlos III, Universidad Pablo de Olavide, Carretera de Utrera km. 1, 41013, Seville, Spain
| | - Daniel J Moreno Fernández-Ayala
- Centro Andaluz de Biología del Desarrollo, CABD-CSIC, CIBERER, Instituto de Salud Carlos III, Universidad Pablo de Olavide, Carretera de Utrera km. 1, 41013, Seville, Spain
| | - Plácido Navas
- Centro Andaluz de Biología del Desarrollo, CABD-CSIC, CIBERER, Instituto de Salud Carlos III, Universidad Pablo de Olavide, Carretera de Utrera km. 1, 41013, Seville, Spain
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Barbier M, Fellmann D, Risold PY. Morphofunctional Organization of the Connections From the Medial and Intermediate Parts of the Central Nucleus of the Amygdala Into Distinct Divisions of the Lateral Hypothalamic Area in the Rat. Front Neurol 2018; 9:688. [PMID: 30210427 PMCID: PMC6119805 DOI: 10.3389/fneur.2018.00688] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 07/30/2018] [Indexed: 11/23/2022] Open
Abstract
Projections from the central nucleus of the amygdala (CEA) into the lateral hypothalamic area (LHA) show a very complex pattern. After injection of an anterograde tracer (Phaseolus vulgaris leucoagglutinin—PHAL) into the medial and intermediate parts of the CEA, we observed that labeled axons converged onto the caudal lateral LHA but provided distinct patterns in rostral tuberal regions. These projections were compared to that of neurons containing the peptides “melanin-concentrating hormone” (MCH) or hypocretin (Hcrt). Because the distribution of these neurons is stereotyped, it was possible to characterize distinct divisions into the LHA. Some of them in the rostral tuberal LHA [the dorsal (LHAd) and suprafornical regions (LHAs)] received a distinct innervation by projections that originated from neurons in respectively anterior or posterior regions of the medial part (CEAm) or from the intermediate part (CEAi) of the central nucleus. Therefore, this work illustrates that projections from the CEAm and CEAi converge into the caudal lateral LHA but diverge into the rostral tuberal LHA.
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Affiliation(s)
- Marie Barbier
- Laboratoire de Neurosciences Intégratives et Cliniques, EA481, UFR Sciences Médicales et Pharmaceutiques, Université de Bourgogne Franche-Comté, Besançon, France
| | - Dominique Fellmann
- Laboratoire de Neurosciences Intégratives et Cliniques, EA481, UFR Sciences Médicales et Pharmaceutiques, Université de Bourgogne Franche-Comté, Besançon, France
| | - Pierre-Yves Risold
- Laboratoire de Neurosciences Intégratives et Cliniques, EA481, UFR Sciences Médicales et Pharmaceutiques, Université de Bourgogne Franche-Comté, Besançon, France
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55
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A Novel Spatiotemporal Longitudinal Methodology for Predicting Obesity Using Near Infrared Spectroscopy (NIRS) Cerebral Functional Activity Data. Cognit Comput 2018. [DOI: 10.1007/s12559-017-9541-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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56
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Targeting AgRP neurons to maintain energy balance: Lessons from animal models. Biochem Pharmacol 2018; 155:224-232. [PMID: 30012460 DOI: 10.1016/j.bcp.2018.07.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 07/12/2018] [Indexed: 01/19/2023]
Abstract
The current obesity epidemic is a major worldwide health and economic burden. In the modern environment, an increase in the intake of high-fat and high-sugar foods plays a crucial role in the development of obesity by disrupting the mechanisms governing food intake and energy balance. Food intake and whole-body energy balance are regulated by the central nervous system through a sophisticated neuronal network located mostly in the hypothalamus. In particular, the hypothalamic arcuate nucleus (ARC) is a fundamental center that senses hormonal and nutrient-related signals informing about the energy state of the organism. The ARC contains two small, defined populations of neurons with opposite functions: anorexigenic proopiomelanocortin (POMC)-expressing neurons and orexigenic Agouti-related protein (AgRP)-expressing neurons. AgRP neurons, which also co-produce neuropeptide Y (NPY) and γ-Aminobutyric acid (GABA), are involved in an increase in hunger and a decrease in energy expenditure. In this review, we summarize the key findings from the most common animal models targeting AgRP neurons and the tools used to discern the role of this specific neuronal population in the control of peripheral metabolism, appetite, feeding-related behavior, and other complex behaviors. We also discuss how knowledge gained from these studies has revealed new pathways and key proteins that could be potential therapeutic targets to reduce appetite and food addictions in obesity and other diseases.
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Licholai JA, Nguyen KP, Fobbs WC, Schuster CJ, Ali MA, Kravitz AV. Why Do Mice Overeat High-Fat Diets? How High-Fat Diet Alters the Regulation of Daily Caloric Intake in Mice. Obesity (Silver Spring) 2018; 26:1026-1033. [PMID: 29707908 PMCID: PMC5970071 DOI: 10.1002/oby.22195] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Revised: 02/24/2018] [Accepted: 03/21/2018] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Ad libitum high-fat diets (HFDs) spontaneously increase caloric intake in rodents, which correlates positively with weight gain. However, it remains unclear why rodents overeat HFDs. This paper investigated how changing the proportion of diet that came from HFDs might alter daily caloric intake in mice. METHODS Mice were given 25%, 50%, or 90% of their daily caloric need from an HFD, along with ad libitum access to a low-fat rodent chow diet. Food intake was measured daily to determine how these HFD supplements impacted total daily caloric intake. Follow-up experiments addressed the timing of HFD feeding. RESULTS HFD supplements did not alter total caloric intake or body weight. In a follow-up experiment, mice consumed approximately 50% of their daily caloric need from an HFD in 30 minutes during the light cycle, a time when mice do not normally consume food. CONCLUSIONS An HFD did not disrupt regulation of total daily caloric intake, even when up to 90% of total calories came from the HFD. However, HFDs increased daily caloric intake when provided ad libitum and were readily consumed by mice outside of their normal feeding cycle. Ad libitum HFDs appear to induce overconsumption beyond the mechanisms that regulate daily caloric intake.
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Affiliation(s)
- Julia A Licholai
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Katrina P Nguyen
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Wambura C Fobbs
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Corbin J Schuster
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Mohamed A Ali
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
| | - Alexxai V Kravitz
- National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, USA
- National Institute on Drug Abuse, Baltimore, Maryland, USA
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The relationship between serum leptin level and disease activity and inflammatory markers in fibromyalgia patients. North Clin Istanb 2018; 5:102-108. [PMID: 30374474 PMCID: PMC6191563 DOI: 10.14744/nci.2017.31644] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 08/18/2017] [Indexed: 12/23/2022] Open
Abstract
OBJECTIVE The aim of this study was to investigate whether there is a correlation between serum leptin level, disease activity and inflammation markers in patients with fibromyalgia syndrome (FMS). METHODS A total of 48 patients with FMS diagnosed according to the 1990 American College of Rheumatology criteria were included in the study, as well as 36 healthy women as controls. The Visual Analogue Scale was used to gauge pain severity, the Fibromyalgia Impact Questionnaire was used to assess physical function, the 36-Item Short Form Health Survey was used to examine quality of life, and depression was measured with the Beck Depression Inventory. Blood samples were examined for erythrocyte sedimentation rate (ESR), C-reactive protein level (CRP), high-sensitivity CRP level (hsCRP), the neutrophil-to-lymphocyte ratio (NLR), and the serum leptin level was determined using the enzyme-linked immunosorbent assay method. RESULTS The serum leptin level in patients with FMS was significantly higher than in the healthy group. However, no significant relationship was found between leptin level and clinical and inflammatory parameters. In addition, there were no significant differences between the patients and the control group in measurements of ESR, CRP, hsCRP, or NLR. CONCLUSION A higher serum leptin level in patients with FMS suggested that leptin may play role in the pathogenesis of FMS, yet there was no relationship between leptin and clinical and inflammatory parameters, suggesting that leptin is not an indicator of disease activity in FMS. Additional research should be performed with larger patient groups.
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Nday CM, Eleftheriadou D, Jackson G. Shared pathological pathways of Alzheimer's disease with specific comorbidities: current perspectives and interventions. J Neurochem 2018; 144:360-389. [PMID: 29164610 DOI: 10.1111/jnc.14256] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 11/10/2017] [Accepted: 11/10/2017] [Indexed: 02/06/2023]
Abstract
Alzheimer's disease (AD) belongs to one of the most multifactorial, complex and heterogeneous morbidity-leading disorders. Despite the extensive research in the field, AD pathogenesis is still at some extend obscure. Mechanisms linking AD with certain comorbidities, namely diabetes mellitus, obesity and dyslipidemia, are increasingly gaining importance, mainly because of their potential role in promoting AD development and exacerbation. Their exact cognitive impairment trajectories, however, remain to be fully elucidated. The current review aims to offer a clear and comprehensive description of the state-of-the-art approaches focused on generating in-depth knowledge regarding the overlapping pathology of AD and its concomitant ailments. Thorough understanding of associated alterations on a number of molecular, metabolic and hormonal pathways, will contribute to the further development of novel and integrated theranostics, as well as targeted interventions that may be beneficial for individuals with age-related cognitive decline.
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Affiliation(s)
- Christiane M Nday
- Department of Chemical Engineering, Laboratory of Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Despoina Eleftheriadou
- Department of Chemical Engineering, Laboratory of Inorganic Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Graham Jackson
- Department of Chemistry, University of Cape Town, Rondebosch, Cape Town, South Africa
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Functional Interrogation of the AgRP Neural Circuits in Control of Appetite, Body Weight, and Behaviors. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1090:1-16. [PMID: 30390282 DOI: 10.1007/978-981-13-1286-1_1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Neurons expressing agouti-related protein (AgRP), the so-called hunger neurons, protect mammals from starvation by promoting food-seeking behaviors (Trends Neurosci 36:504-512, 2013). Now an increasing amount of evidence show that these hunger-sensing neurons not only motivate animals to forage and ingest food but also help conserve energy by inhibiting innate processes that demand large amounts of energy such as growth, reproduction, and stress response. It has further been perceived that AgRP neurons transmit signals with negative valence to reward and cognitive centers so as to engage the motivational behavior toward seeking and obtaining foods (Physiol Behav 190:34-42, 2017). Recent advancement in genome editing and neurotechniques unleashed an escalated research of uniquely defined neuronal populations and neural circuits underlying the behavioral regulation of body weight and food responses (Nat Biotechnol 32:347-355, 2014; Proc Natl Acad Sci 113, 2016). In this chapter we will review literatures describing the functional organization of the AgRP circuit and its correlative signaling components that influence ingestive, foraging, motivational, and cognitive responses, a framework that reshaped our thinking toward the new hope and challenges in treatment of obesity and eating disorders.
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Estrogen receptor signaling mediates leptin-induced growth of breast cancer cells via autophagy induction. Oncotarget 2017; 8:109417-109435. [PMID: 29312618 PMCID: PMC5752531 DOI: 10.18632/oncotarget.22684] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 10/29/2017] [Indexed: 12/19/2022] Open
Abstract
Leptin, a hormone derived from adipose tissue, promotes growth of cancer cells via multiple mechanisms. Estrogen receptor signaling is also known to stimulate the growth of breast cancer cells. However, the involvement of estrogen receptor signaling in the oncogenic actions of leptin and its underlying mechanisms are not clearly understood. Herein, we investigated mechanisms for estrogen receptor signaling-mediated growth of breast cancer cells, particularly focusing on autophagy, which plays a crucial role in leptin-induced tumor growth. Inhibition of estrogen receptor signaling via gene silencing or treatment with a pharmacological inhibitor (tamoxifen) abolished leptin-induced growth of MCF-7 human breast cancer cells. Interestingly, leptin-induced autophagy activation, determined by up-regulation of autophagy-related genes and autophagosome formation, was also significantly suppressed by inhibiting estrogen receptor signaling. Moreover, inhibition of estrogen receptor markedly prevented leptin-induced activation of AMPK/FoxO3A axis, which plays a crucial role in autophagy induction. Leptin-induced cell cycle progression and Bax down-regulation were also prevented by treatment with tamoxifen. The pivotal roles of estrogen receptor signaling in leptin-induced cell cycle progression, apoptosis suppression, and autophagy induction were further confirmed in MCF-7 tumor xenograft model. Taken together, these results demonstrate that estrogen receptor signaling plays a key role in leptin-induced growth of breast cancer cells via autophagy activation.
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Tian HF, Hu QM, Meng Y, Xiao HB. Molecular cloning, characterization and evolutionary analysis of leptin gene in Chinese giant salamander, Andrias davidianus. Open Life Sci 2017. [DOI: 10.1515/biol-2017-0048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
AbstractLeptin is an important hormone possessing diverse physiological roles in mammals and teleosts. However, it has been characterized only in a few amphibian species, and its evolutions are still under debate. Here, the full length of the leptin (Adlep) cDNA of Chinese giant salamander (Andrias davidianus), an early diverging amphibian species, is characterized and according to the results of the primary sequence analysis, tertiary structure reconstruction and phylogenetic analysis is confirmed to be an ortholog of mammalian leptin. An intron was identified between the coding exons of A. davidianus leptin, which indicated that the leptin is present in the salamander genome and contains a conserved gene structure in vertebrates. Adlep is widely distributed but expression levels vary among different tissues, with highest expression levels in the muscle. Additionally, the leptin receptor and other genes were mapped to three known leptin signaling pathways, suggesting that the leptin signaling pathways are present in A. davidianus. Phylogenetic topology of leptins are consistent with the generally accepted evolutionary relationships of vertebrates, and multiple leptin members found in teleosts seem to be obtained through a Cluopeocephala-specific gene duplication event. Our results will lay a foundation for further investigations into the physiological roles of leptin in A. davidianus.
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Affiliation(s)
- Hai-feng Tian
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan430223, P. R. China
| | - Qiao-mu Hu
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan430223, P. R. China
| | - Yan Meng
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan430223, P. R. China
| | - Han-bing Xiao
- No. 8, 1st Wudayuan Road, Donghu Hi-Tech Development Zone, Wuhan430223, China
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Freyberg Z, Aslanoglou D, Shah R, Ballon JS. Intrinsic and Antipsychotic Drug-Induced Metabolic Dysfunction in Schizophrenia. Front Neurosci 2017; 11:432. [PMID: 28804444 PMCID: PMC5532378 DOI: 10.3389/fnins.2017.00432] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 07/13/2017] [Indexed: 12/12/2022] Open
Abstract
For decades, there have been observations demonstrating significant metabolic disturbances in people with schizophrenia including clinically relevant weight gain, hypertension, and disturbances in glucose and lipid homeostasis. Many of these findings pre-date the use of antipsychotic drugs (APDs) which on their own are also strongly associated with metabolic side effects. The combination of APD-induced metabolic changes and common adverse environmental factors associated with schizophrenia have made it difficult to determine the specific contributions of each to the overall metabolic picture. Data from drug-naïve patients, both from the pre-APD era and more recently, suggest that there may be an intrinsic metabolic risk associated with schizophrenia. Nevertheless, these findings remain controversial due to significant clinical variability in both psychiatric and metabolic symptoms throughout patients' disease courses. Here, we provide an extensive review of classic and more recent literature describing the metabolic phenotype associated with schizophrenia. We also suggest potential mechanistic links between signaling pathways associated with schizophrenia and metabolic dysfunction. We propose that, beyond its symptomatology in the central nervous system, schizophrenia is also characterized by pathophysiology in other organ systems directly related to metabolic control.
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Affiliation(s)
- Zachary Freyberg
- Department of Psychiatry, University of PittsburghPittsburgh, PA, United States
- Department of Cell Biology, University of PittsburghPittsburgh, PA, United States
| | - Despoina Aslanoglou
- Department of Psychiatry, University of PittsburghPittsburgh, PA, United States
| | - Ripal Shah
- Department of Psychiatry and Behavioral Sciences, Stanford UniversityStanford, CA, United States
| | - Jacob S. Ballon
- Department of Psychiatry and Behavioral Sciences, Stanford UniversityStanford, CA, United States
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Central Administration of 1-Deoxynojirimycin Attenuates Hypothalamic Endoplasmic Reticulum Stress and Regulates Food Intake and Body Weight in Mice with High-Fat Diet-Induced Obesity. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2017; 2017:3607089. [PMID: 28798799 PMCID: PMC5535735 DOI: 10.1155/2017/3607089] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 05/23/2017] [Accepted: 05/30/2017] [Indexed: 12/19/2022]
Abstract
The α-glucosidase inhibitor, 1-deoxynojirimycin (DNJ), is widely used for its antiobesity and antidiabetic effects. Researchers have demonstrated that DNJ regulates body weight by increasing adiponectin levels, which affects energy intake and prevents diet-induced obesity. However, the mechanism by which centrally administered DNJ exerts anorexigenic effects has not been studied until now. We investigated the effect of DNJ in the hypothalamus of mice with high-fat diet-induced obesity. Results showed that intracerebroventricular (ICV) administration of DNJ reduced hypothalamic ER stress, which activated the leptin-induced Janus-activated kinase 2 (JAK2)/signal transducers and activators of transcription 3 (STAT3) signaling pathway to cause appetite suppression. We conclude that DNJ may reduce obesity by moderating feeding behavior and ER stress in the hypothalamic portion of the central nervous system (CNS).
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Rozo AV, Babu DA, Suen PA, Groff DN, Seeley RJ, Simmons RA, Seale P, Ahima RS, Stoffers DA. Neonatal GLP1R activation limits adult adiposity by durably altering hypothalamic architecture. Mol Metab 2017; 6:748-759. [PMID: 28702330 PMCID: PMC5485307 DOI: 10.1016/j.molmet.2017.05.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 05/03/2017] [Accepted: 05/10/2017] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Adult obesity risk is influenced by alterations to fetal and neonatal environments. Modifying neonatal gut or neurohormone signaling pathways can have negative metabolic consequences in adulthood. Here we characterize the effect of neonatal activation of glucagon like peptide-1 (GLP-1) receptor (GLP1R) signaling on adult adiposity and metabolism. METHODS Wild type C57BL/6 mice were injected with 1 nmol/kg Exendin-4 (Ex-4), a GLP1R agonist, for 6 consecutive days after birth. Growth, body composition, serum analysis, energy expenditure, food intake, and brain and fat pad histology and gene expression were assessed at multiple time points through 42 weeks. Similar analyses were conducted in a Glp1r conditional allele crossed with a Sim1Cre deleter strain to produce Sim1Cre;Glp1rloxP/loxP mice and control littermates. RESULTS Neonatal administration of Ex-4 reduced adult body weight and fat mass, increased energy expenditure, and conferred protection from diet-induced obesity in female mice. This was associated with induction of brown adipose genes and increased noradrenergic fiber density in parametrial white adipose tissue (WAT). We further observed durable alterations in orexigenic and anorexigenic projections to the paraventricular hypothalamic nucleus (PVH). Genetic deletion of Glp1r in the PVH by Sim1-Cre abrogated the impact of neonatal Ex-4 on adult body weight, WAT browning, and hypothalamic architecture. CONCLUSION These observations suggest that the acute activation of GLP1R in neonates durably alters hypothalamic architecture to limit adult weight gain and adiposity, identifying GLP1R as a therapeutic target for obesity prevention.
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Affiliation(s)
- Andrea V. Rozo
- Institute for Diabetes, Obesity and Metabolism and the Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
| | - Daniella A. Babu
- Institute for Diabetes, Obesity and Metabolism and the Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
| | - PoMan A. Suen
- Institute for Diabetes, Obesity and Metabolism and the Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
| | - David N. Groff
- Institute for Diabetes, Obesity and Metabolism and the Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
| | - Randy J. Seeley
- Department of Surgery, University of Michigan, 2800 Plymouth Road, Ann Arbor, MI, 48109, USA
| | - Rebecca A. Simmons
- Department of Pediatrics, Division of Neonatology, The Children's Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
| | - Patrick Seale
- Institute for Diabetes, Obesity and Metabolism and the Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
| | - Rexford S. Ahima
- Institute for Diabetes, Obesity and Metabolism and the Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
| | - Doris A. Stoffers
- Institute for Diabetes, Obesity and Metabolism and the Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, 3400 Civic Center Boulevard, Philadelphia, PA, 19104, USA
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Miller GD. Appetite Regulation: Hormones, Peptides, and Neurotransmitters and Their Role in Obesity. Am J Lifestyle Med 2017; 13:586-601. [PMID: 31662725 DOI: 10.1177/1559827617716376] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 05/18/2017] [Accepted: 05/31/2017] [Indexed: 12/29/2022] Open
Abstract
Understanding body weight regulation will aid in the development of new strategies to combat obesity. This review examines energy homeostasis and food intake behaviors, specifically with regards to hormones, peptides, and neurotransmitters in the periphery and central nervous system, and their potential role in obesity. Dysfunction in feeding signals by the brain is a factor in obesity. The hypothalamic (arcuate nucleus) and brainstem (nucleus tractus solitaris) areas integrate behavioral, endocrine, and autonomic responses via afferent and efferent pathways from and to the brainstem and peripheral organs. Neurons present in the arcuate nucleus express pro-opiomelanocortin, Neuropeptide Y, and Agouti Related Peptide, with the former involved in lowering food intake, and the latter two acutely increasing feeding behaviors. Action of peripheral hormones from the gut, pancreas, adipose, and liver are also involved in energy homeostasis. Vagal afferent neurons are also important in regulating energy homeostasis. Peripheral signals respond to the level of stored and currently available fuel. By studying their actions, new agents maybe developed that disable orexigenic responses and enhance anorexigenic signals. Although there are relatively few medications currently available for obesity treatment, a number of agents are in development that work through these pathways.
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Affiliation(s)
- Gary D Miller
- Department of Health and Exercise Science, Wake Forest University, Winston-Salem, North Carolina
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67
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Lanfray D, Richard D. Emerging Signaling Pathway in Arcuate Feeding-Related Neurons: Role of the Acbd7. Front Neurosci 2017; 11:328. [PMID: 28690493 PMCID: PMC5481368 DOI: 10.3389/fnins.2017.00328] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 05/24/2017] [Indexed: 01/28/2023] Open
Abstract
The understanding of the mechanisms whereby energy balance is regulated is essential to the unraveling of the pathophysiology of obesity. In the last three decades, focus was put on the metabolic role played by the hypothalamic neurons expressing proopiomelanocortin (POMC) and cocaine and amphetamine regulated transcript (CART) and the neurons co-localizing agouti-related peptide (AgRP), neuropeptide Y (NPY), and gamma-aminobutyric acid (GABA). These neurons are part of the leptin-melanocortin pathway, whose role is key in energy balance regulation. More recently, the metabolic involvement of further hypothalamic uncharacterized neuron populations has been suggested. In this review, we discuss the potential homeostatic implication of hypothalamic GABAergic neurons that produce Acyl-Coa-binding domain containing protein 7 (ACBD7), precursor of the nonadecaneuropeptide (NDN), which has recently been characterized as a potent anorexigenic neuropeptide capable of relaying the leptin anorectic/thermogenic effect via the melanocortin system.
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Affiliation(s)
- Damien Lanfray
- Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université LavalQuébec, QC, Canada
| | - Denis Richard
- Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université LavalQuébec, QC, Canada
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68
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Chachlaki K, Malone SA, Qualls-Creekmore E, Hrabovszky E, Münzberg H, Giacobini P, Ango F, Prevot V. Phenotyping of nNOS neurons in the postnatal and adult female mouse hypothalamus. J Comp Neurol 2017; 525:3177-3189. [PMID: 28577305 DOI: 10.1002/cne.24257] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 05/01/2017] [Accepted: 05/19/2017] [Indexed: 12/27/2022]
Abstract
Neurons expressing nitric oxide (NO) synthase (nNOS) and thus capable of synthesizing NO play major roles in many aspects of brain function. While the heterogeneity of nNOS-expressing neurons has been studied in various brain regions, their phenotype in the hypothalamus remains largely unknown. Here we examined the distribution of cells expressing nNOS in the postnatal and adult female mouse hypothalamus using immunohistochemistry. In both adults and neonates, nNOS was largely restricted to regions of the hypothalamus involved in the control of bodily functions, such as energy balance and reproduction. Labeled cells were found in the paraventricular, ventromedial, and dorsomedial nuclei as well as in the lateral area of the hypothalamus. Intriguingly, nNOS was seen only after the second week of life in the arcuate nucleus of the hypothalamus (ARH). The most dense and heavily labeled population of cells was found in the organum vasculosum laminae terminalis (OV) and the median preoptic nucleus (MEPO), where most of the somata of the neuroendocrine neurons releasing GnRH and controlling reproduction are located. A great proportion of nNOS-immunoreactive neurons in the OV/MEPO and ARH were seen to express estrogen receptor (ER) α. Notably, almost all ERα-immunoreactive cells of the OV/MEPO also expressed nNOS. Moreover, the use of EYFPVglut2 , EYFPVgat , and GFPGad67 transgenic mouse lines revealed that, like GnRH neurons, most hypothalamic nNOS neurons have a glutamatergic phenotype, except for nNOS neurons of the ARH, which are GABAergic. Altogether, these observations are consistent with the proposed role of nNOS neurons in physiological processes.
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Affiliation(s)
- Konstantina Chachlaki
- Inserm, Laboratory of Development and Plasticity of the Neuroendocrine Brain, Jean-Pierre Aubert Research Center, U1172, Lille, France.,University of Lille, FHU 1000 days for Health, School of Medicine, Lille, France
| | - Samuel A Malone
- Inserm, Laboratory of Development and Plasticity of the Neuroendocrine Brain, Jean-Pierre Aubert Research Center, U1172, Lille, France.,University of Lille, FHU 1000 days for Health, School of Medicine, Lille, France
| | - Emily Qualls-Creekmore
- Departments of Central Leptin Signaling, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana
| | - Erik Hrabovszky
- Institute of Experimental Medicine, Laboratory of Endocrine Neurobiology, Budapest, Hungary
| | - Heike Münzberg
- Departments of Central Leptin Signaling, Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, Louisiana
| | - Paolo Giacobini
- Inserm, Laboratory of Development and Plasticity of the Neuroendocrine Brain, Jean-Pierre Aubert Research Center, U1172, Lille, France.,University of Lille, FHU 1000 days for Health, School of Medicine, Lille, France
| | - Fabrice Ango
- Inserm, Laboratory of Development of GABAergic circuit, IGF, U1191, Montpellier, France.,University of Montpellier, CNRS UMR5203, Montpellier, France
| | - Vincent Prevot
- Inserm, Laboratory of Development and Plasticity of the Neuroendocrine Brain, Jean-Pierre Aubert Research Center, U1172, Lille, France.,University of Lille, FHU 1000 days for Health, School of Medicine, Lille, France
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69
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Roberts BL, Zhu M, Zhao H, Dillon C, Appleyard SM. High glucose increases action potential firing of catecholamine neurons in the nucleus of the solitary tract by increasing spontaneous glutamate inputs. Am J Physiol Regul Integr Comp Physiol 2017; 313:R229-R239. [PMID: 28615161 DOI: 10.1152/ajpregu.00413.2016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 06/12/2017] [Accepted: 06/12/2017] [Indexed: 02/07/2023]
Abstract
Glucose is a crucial substrate essential for cell survival and function. Changes in glucose levels impact neuronal activity and glucose deprivation increases feeding. Several brain regions have been shown to respond to glucoprivation, including the nucleus of the solitary tract (NTS) in the brain stem. The NTS is the primary site in the brain that receives visceral afferent information from the gastrointestinal tract. The catecholaminergic (CA) subpopulation within the NTS modulates many homeostatic functions including cardiovascular reflexes, respiration, food intake, arousal, and stress. However, it is not known if they respond to changes in glucose. Here we determined whether NTS-CA neurons respond to changes in glucose concentration and the mechanism involved. We found that decreasing glucose concentrations from 5 mM to 2 mM to 1 mM, significantly decreased action potential firing in a cell-attached preparation, whereas increasing it back to 5 mM increased the firing rate. This effect was dependent on glutamate release from afferent terminals and required presynaptic 5-HT3Rs. Decreasing the glucose concentration also decreased both basal and 5-HT3R agonist-induced increase in the frequency of spontaneous glutamate inputs onto NTS-CA neurons. Low glucose also blunted 5-HT-induced inward currents in nodose ganglia neurons, which are the cell bodies of vagal afferents. The effect of low glucose in both nodose ganglia cells and in NTS slices was mimicked by the glucokinase inhibitor glucosamine. This study suggests that NTS-CA neurons are glucosensing through a presynaptic mechanism that is dependent on vagal glutamate release, 5-HT3R activity, and glucokinase.
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Affiliation(s)
- Brandon L Roberts
- Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington
| | - Mingyan Zhu
- Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington
| | - Huan Zhao
- Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington
| | - Crystal Dillon
- Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington
| | - Suzanne M Appleyard
- Department of Integrative Physiology and Neuroscience, Washington State University, Pullman, Washington
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70
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Seo M, Kim J, Moon SS, Hwang JS, Kim MA. Intraventricular administration of Tenebrio molitor larvae extract regulates food intake and body weight in mice with high-fat diet-induced obesity. Nutr Res 2017; 44:18-26. [PMID: 28821314 DOI: 10.1016/j.nutres.2017.05.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 05/10/2017] [Accepted: 05/12/2017] [Indexed: 11/26/2022]
Abstract
We recently reported the in vitro and in vivo antiobesity effects of Tenebrio molitor larvae, a traditional food in many countries, but it remains unknown how the larvae affect appetite regulation in mice with diet-induced obesity. We hypothesized that the extract of T molitor larvae mediates appetite by regulating neuropeptide expression. We investigated T molitor larvae extract's (TME's) effects on anorexigenesis and endoplasmic reticulum (ER) stress-induced orexigenic neuropeptide expression in the hypothalami of obese mice. Intracerebroventricular TME administration suppressed feeding by down-regulating the expression of the orexigenic neuropeptides neuropeptide Y and agouti-related protein. T molitor larvae extract significantly reduced the expression of ER stress response genes. These results suggest that TME and its bioactive components are potential therapeutics for obesity and ER stress-driven disease states.
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Affiliation(s)
- Minchul Seo
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju-gun 55365, Republic of Korea
| | - Jongwan Kim
- Department of Anatomy, Dongguk University College of Medicine, Gyeongju 38066, Republic of Korea
| | - Seong-Su Moon
- Department of Internal Medicine, Dongguk University College of Medicine, Gyeongju 38066, Republic of Korea
| | - Jae-Sam Hwang
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju-gun 55365, Republic of Korea
| | - Mi-Ae Kim
- Department of Agricultural Biology, National Institute of Agricultural Sciences, Rural Development Administration, Wanju-gun 55365, Republic of Korea.
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71
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Tups A, Benzler J, Sergi D, Ladyman SR, Williams LM. Central Regulation of Glucose Homeostasis. Compr Physiol 2017; 7:741-764. [DOI: 10.1002/cphy.c160015] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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72
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Ye L, Hu Y, Xu FH, Cai CY, Song DW, Xu ZS, Du WD. Protein biochip-based semiquantitative detection for plasma leptin. Proteomics Clin Appl 2016; 11. [DOI: 10.1002/prca.201600073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Revised: 11/07/2016] [Accepted: 11/28/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Lei Ye
- Department of Pathology; the First Affiliated Hospital; Anhui Medical University; Hefei P.R. China
| | - Yuan Hu
- Department of Medicine, Immunology Institute; Icahn School of Medicine at Mount Sinai; New York NY USA
| | - Fei-Hong Xu
- Department of Medicine, Immunology Institute; Icahn School of Medicine at Mount Sinai; New York NY USA
| | - Cheng-Yun Cai
- Anhui Academic Institute of Biology; Hefei Anhui P.R. China
| | - Da-Wei Song
- Anhui Academic Institute of Biology; Hefei Anhui P.R. China
| | - Zhen-Shan Xu
- Anhui Academic Institute of Biology; Hefei Anhui P.R. China
| | - Wei-Dong Du
- Department of Pathology; the First Affiliated Hospital; Anhui Medical University; Hefei P.R. China
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73
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A role for leptin-regulated neurocircuitry in subordination stress. Physiol Behav 2016; 178:144-150. [PMID: 27887997 DOI: 10.1016/j.physbeh.2016.11.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 11/07/2016] [Accepted: 11/18/2016] [Indexed: 02/07/2023]
Abstract
The visible burrow system produces a distinct combination of psychological and metabolic stress on, primarily, subordinate individuals that results in pronounced physiologic and behavioral dysfunction. However, the mechanisms underlying the consequences of chronic subordination stress are largely unknown. The simplest mechanistic explanation is that adaptations within brain systems with overlapping functions of both psychological and metabolic control provide immediate benefits that result in lasting susceptibility to diseases, disorders, and increased mortality rates in subordinates. Circuits regulated by leptin adapt to fluctuating levels of energy storage, such that the loss of leptin action within leptin-regulated neurocircuitry results in dysfunction in physiologic and behavioral systems implicated in the consequences of chronic social subordination. Thus, leptin-regulated neurocircuitry may provide a window into understanding the consequences of social subordination stress. This review examines the neural systems of leptin physiology implicated in social subordination stress: energy balance, motivation, HPA axis, and glycemic control.
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74
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Tudurí E, Beiroa D, Stegbauer J, Fernø J, López M, Diéguez C, Nogueiras R. Acute stimulation of brain mu opioid receptors inhibits glucose-stimulated insulin secretion via sympathetic innervation. Neuropharmacology 2016; 110:322-332. [DOI: 10.1016/j.neuropharm.2016.08.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 07/10/2016] [Accepted: 08/05/2016] [Indexed: 01/19/2023]
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75
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Ribe EM, Lovestone S. Insulin signalling in Alzheimer's disease and diabetes: from epidemiology to molecular links. J Intern Med 2016; 280:430-442. [PMID: 27739227 DOI: 10.1111/joim.12534] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
As populations across the world both age and become more obese, the numbers of individuals with Alzheimer's disease and diabetes are increasing; posing enormous challenges for society and consequently becoming priorities for governments and global organizations. These issues, an ageing population at risk of neurodegenerative diseases such as Alzheimer's disease and an increasingly obese population at risk of metabolic alterations such as type 2 diabetes, are usually considered as independent conditions, but increasing evidence from both epidemiological and molecular studies link these disorders. The aim of this review was to highlight these multifactorial links. We will discuss the impact of direct links between insulin and IGF-1 signalling and the Alzheimer's disease-associated pathological events as well as the impact of other processes such as inflammation, oxidative stress and mitochondrial dysfunction either common to both conditions or perhaps responsible for a mechanistic link between metabolic and neurodegenerative disease. An understanding of such associations might be of importance not only in the understanding of disease mechanisms but also in the search for novel therapeutic options.
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Affiliation(s)
- E M Ribe
- Department of Psychiatry, Warneford Hospital, University of Oxford, Oxford, UK
| | - S Lovestone
- Department of Psychiatry, Warneford Hospital, University of Oxford, Oxford, UK.
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76
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Caron A, Richard D. Neuronal systems and circuits involved in the control of food intake and adaptive thermogenesis. Ann N Y Acad Sci 2016; 1391:35-53. [PMID: 27768821 DOI: 10.1111/nyas.13263] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Revised: 08/18/2016] [Accepted: 08/24/2016] [Indexed: 12/27/2022]
Abstract
With the still-growing prevalence of obesity worldwide, major efforts are made to understand the various behavioral, environmental, and genetic factors that promote excess fat gain. Obesity results from an imbalance between energy intake and energy expenditure, which emphasizes the importance of deciphering the mechanisms behind energy balance regulation to understand its physiopathology. The control of energy balance is assured by brain systems/circuits capable of generating adequate ingestive and thermogenic responses to maintain the stability of energy reserves, which implies a proper integration of the homeostatic signals that inform about the status of the energy stores. In this article, we overview the organization and functionality of key neuronal circuits or pathways involved in the control of food intake and energy expenditure. We review the role of the corticolimbic (executive and reward) and autonomic systems that integrate their activities to regulate energy balance. We also describe the mechanisms and pathways whereby homeostatic sensing is achieved in response to variations of homeostatic hormones, such as leptin, insulin, and ghrelin, while putting some emphasis on the prominent importance of the mechanistic target of the rapamycin signaling pathway in coordinating the homeostatic sensing process.
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Affiliation(s)
- Alexandre Caron
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec and Faculty of Medicine, Department of Medicine, Université Laval, Quebec City, Quebec, Canada
| | - Denis Richard
- Institut Universitaire de Cardiologie et de Pneumologie de Quebec and Faculty of Medicine, Department of Medicine, Université Laval, Quebec City, Quebec, Canada
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77
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Le Thuc O, Cansell C, Bourourou M, Denis RG, Stobbe K, Devaux N, Guyon A, Cazareth J, Heurteaux C, Rostène W, Luquet S, Blondeau N, Nahon JL, Rovère C. Central CCL2 signaling onto MCH neurons mediates metabolic and behavioral adaptation to inflammation. EMBO Rep 2016; 17:1738-1752. [PMID: 27733491 DOI: 10.15252/embr.201541499] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 08/25/2016] [Accepted: 08/30/2016] [Indexed: 12/30/2022] Open
Abstract
Sickness behavior defines the endocrine, autonomic, behavioral, and metabolic responses associated with infection. While inflammatory responses were suggested to be instrumental in the loss of appetite and body weight, the molecular underpinning remains unknown. Here, we show that systemic or central lipopolysaccharide (LPS) injection results in specific hypothalamic changes characterized by a precocious increase in the chemokine ligand 2 (CCL2) followed by an increase in pro-inflammatory cytokines and a decrease in the orexigenic neuropeptide melanin-concentrating hormone (MCH). We therefore hypothesized that CCL2 could be the central relay for the loss in body weight induced by the inflammatory signal LPS. We find that central delivery of CCL2 promotes neuroinflammation and the decrease in MCH and body weight. MCH neurons express CCL2 receptor and respond to CCL2 by decreasing both electrical activity and MCH release. Pharmacological or genetic inhibition of CCL2 signaling opposes the response to LPS at both molecular and physiologic levels. We conclude that CCL2 signaling onto MCH neurons represents a core mechanism that relays peripheral inflammation to sickness behavior.
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Affiliation(s)
- Ophélia Le Thuc
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | - Céline Cansell
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | - Miled Bourourou
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | - Raphaël Gp Denis
- Univ Paris Diderot Sorbonne Paris Cité Unité de Biologie Fonctionnelle et Adaptative CNRS UMR 8251, Paris, France
| | - Katharina Stobbe
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | - Nadège Devaux
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | - Alice Guyon
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | - Julie Cazareth
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | | | - William Rostène
- Institut de la Vision UMRS 968-Université Pierre et Marie Curie, Paris, France
| | - Serge Luquet
- Univ Paris Diderot Sorbonne Paris Cité Unité de Biologie Fonctionnelle et Adaptative CNRS UMR 8251, Paris, France
| | - Nicolas Blondeau
- Université Côte d'Azur, Nice, France.,CNRS, IPMC, Sophia Antipolis, France
| | - Jean-Louis Nahon
- Université Côte d'Azur, Nice, France .,CNRS, IPMC, Sophia Antipolis, France.,Station de Primatologie UPS846 CNRS, Rousset-sur-Arc, France
| | - Carole Rovère
- Université Côte d'Azur, Nice, France .,CNRS, IPMC, Sophia Antipolis, France
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78
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Ulyanova A, To XV, Asad ABMA, Han W, Chuang KH. MEMRI detects neuronal activity and connectivity in hypothalamic neural circuit responding to leptin. Neuroimage 2016; 147:904-915. [PMID: 27729278 DOI: 10.1016/j.neuroimage.2016.10.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 10/03/2016] [Accepted: 10/07/2016] [Indexed: 10/20/2022] Open
Abstract
Hypothalamus plays the central role in regulating energy homeostasis. To understand the hypothalamic neurocircuit in responding to leptin, Manganese-Enhanced MRI (MEMRI) was applied. Highly elevated signal could be mapped in major nuclei of the leptin signaling pathway, including the arcuate nucleus (ARC), paraventricular nucleus (PVN), ventromedial hypothalamus (VMH) and dorsomedial hypothalamus (DMH) in fasted mice and the enhancement was reduced by leptin administration. However, whether changes in MEMRI signal reflect Ca2+ channel activity, neuronal activation or connectivity in the leptin signaling pathway are not clear. By blocking L-type Ca2+ channels, the signal enhancement in the ARC, PVN and DMH, but not VMH, was reduced. By disrupting microtubule with colchicine, signal enhancement of the secondary neural areas like DMH and PVN was delayed which is consistent with the known projection density from ARC into these regions. Finally, strong correlation between c-fos expression and MEMRI signal increase rate was observed in the ARC, VMH and DMH. Together, we provide experimental evidence that MEMRI signal could represent activity and connectivity in certain hypothalamic nuclei and hence may be used for mapping activated neuronal pathway in vivo. This understanding would facilitate the application of MEMRI for evaluation of hypothalamic dysfunction in metabolic diseases.
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Affiliation(s)
- Anna Ulyanova
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore; Department of Physiology, National University of Singapore, Singapore
| | - Xuan Vinh To
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore
| | - A B M A Asad
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore
| | - Weiping Han
- Lab of Metabolic Medicine, Singapore Bioimaging Consortium, A⁎STAR, Singapore
| | - Kai-Hsiang Chuang
- Magnetic Resonance Imaging Group, Singapore Bioimaging Consortium, Agency for Science Technology and Research (A⁎STAR), Singapore; Department of Physiology, National University of Singapore, Singapore.
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79
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Hewagalamulage SD, Lee TK, Clarke IJ, Henry BA. Stress, cortisol, and obesity: a role for cortisol responsiveness in identifying individuals prone to obesity. Domest Anim Endocrinol 2016; 56 Suppl:S112-20. [PMID: 27345309 DOI: 10.1016/j.domaniend.2016.03.004] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 03/14/2016] [Accepted: 03/18/2016] [Indexed: 11/22/2022]
Abstract
There is a strong inter-relationship between activation of the hypothalamo-pituitary-adrenal axis and energy homeostasis. Patients with abdominal obesity have elevated cortisol levels. Furthermore, stress and glucocorticoids act to control both food intake and energy expenditure. In particular, glucocorticoids are known to increase the consumption of foods enriched in fat and sugar. It is well-known that, in all species, the cortisol response to stress or adrenocorticotropin is highly variable. It has now emerged that cortisol responsiveness is an important determinant in the metabolic sequelae to stress. Sheep that are characterized as high-cortisol responders (HRs) have greater propensity to weight gain and obesity than low-cortisol responders (LRs). This difference in susceptibility to become obese is associated with a distinct metabolic, neuroendocrine, and behavioral phenotype. In women and ewes, HR individuals eat more in response to stress than LR. Furthermore, HR sheep have impaired melanocortin signaling and reduced skeletal muscle thermogenesis. High-cortisol responder sheep exhibit reactive coping strategies, whereas LRs exhibit proactive coping strategies. This complex set of traits leads to increased food intake and reduced energy expenditure in HR and thus, predisposition to obesity. We predict that cortisol responsiveness may be used as a marker to identify individuals who are at risk of weight gain and subsequent obesity.
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Affiliation(s)
| | - T K Lee
- Department of Physiology, Monash University, VIC 3800, Australia
| | - I J Clarke
- Department of Physiology, Monash University, VIC 3800, Australia
| | - B A Henry
- Department of Physiology, Monash University, VIC 3800, Australia.
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80
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Zeng T, Chen L, Du X, Lai SJ, Huang SP, Liu YL, Lu LZ. Association analysis between feed efficiency studies and expression of hypothalamic neuropeptide genes in laying ducks. Anim Genet 2016; 47:606-9. [DOI: 10.1111/age.12457] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/06/2016] [Indexed: 11/30/2022]
Affiliation(s)
- T. Zeng
- Institute of Animal Husbandry and Veterinary Medicine; Zhejiang Academy of Agricultural sciences; Hangzhou 310021 China
- College of Animal Science and Technology; Nanjing Agricultural University; Nanjing 210095 China
| | - L. Chen
- Institute of Animal Husbandry and Veterinary Medicine; Zhejiang Academy of Agricultural sciences; Hangzhou 310021 China
| | - X. Du
- Institute of Animal Husbandry and Veterinary Medicine; Zhejiang Academy of Agricultural sciences; Hangzhou 310021 China
| | - S. J. Lai
- Institute of Animal Husbandry and Veterinary Medicine; Zhejiang Academy of Agricultural sciences; Hangzhou 310021 China
| | - S. P. Huang
- Institute of Animal Husbandry and Veterinary Medicine; Zhejiang Academy of Agricultural sciences; Hangzhou 310021 China
| | - Y. L. Liu
- Zhejiang Animal Husbandry Technique Extension Station; Hangzhou 310020 China
| | - L. Z. Lu
- Institute of Animal Husbandry and Veterinary Medicine; Zhejiang Academy of Agricultural sciences; Hangzhou 310021 China
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81
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Catalogna M, Fishman S, Halpern Z, Ben-Shlomo S, Nevo U, Ben-Jacob E. Regulation of glucose dynamics by noninvasive peripheral electrical stimulation in normal and insulin-resistant rats. Metabolism 2016; 65:863-73. [PMID: 27173465 DOI: 10.1016/j.metabol.2016.03.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 02/25/2016] [Accepted: 03/09/2016] [Indexed: 11/23/2022]
Abstract
BACKGROUND The epidemic nature of type 2 diabetes mellitus (T2DM), along with the downsides of current treatments, has raised the need for therapeutic alternatives. METHODS We studied normo-glycemic and high-fat diet (HFD), induced insulin-resistant Wistar Han rats for 2 to 3weeks. Rats received peripheral electrical stimulation (PES) treatment (2Hz/16Hz bursts, 10mA) in their hind limbs for 3min, 3 times per week. Glucose tolerance was evaluated by using a glucose tolerance test at the beginning and again at the end of the study. The effect of an acute PES treatment on metabolic rates of glucose appearance and turnover was measured by using the hyperinsulinemic-euglycemic clamp (HEGC) test. RESULTS Repeated PES treatment significantly inhibited the progression of glucose intolerance in normal and insulin-resistant rats and prevented HFD-induced gains in body weight and fat mass. Acute treatment induced a prolonged effect on glucose turnover, as evaluated by the HEGC test. Increased hepatic glucose output was observed during the basal state (P<0.005). Under hyperinsulinemic conditions, PES improved tissue sensitivity to insulin (41.1%, P<0.01), improved suppression of hepatic glucose production (58.9±4.4% vs. 87.1±4.4%, P<0.02) and significantly elevated the rate of glycogenesis (P<0.01), compared with controls. CONCLUSIONS The present study indicates that a noninvasive PES treatment of very short duration is sufficiently potent to stimulate glucose utilization and improve hepatic insulin sensitivity in rats. Repeated PES treatment may have a beneficial effect on HFD-induced adiposity and control of body weight.
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Affiliation(s)
- Merav Catalogna
- Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv University, Israel
| | - Sigal Fishman
- Research Center for Digestive Tract and Liver Diseases, Tel Aviv Sourasky Medical Center, Israel, Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Zamir Halpern
- Research Center for Digestive Tract and Liver Diseases, Tel Aviv Sourasky Medical Center, Israel, Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Shani Ben-Shlomo
- Research Center for Digestive Tract and Liver Diseases, Tel Aviv Sourasky Medical Center, Israel, Affiliated with the Sackler School of Medicine, Tel Aviv, Israel
| | - Uri Nevo
- Department of Biomedical Engineering, Faculty of Engineering, Tel Aviv University, Israel.
| | - Eshel Ben-Jacob
- School of Physics and Astronomy, Raymond & Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Israel; Center for Theoretical Biological Physics, Rice University, Houston, TX, USA
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82
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Melasch J, Rullmann M, Hilbert A, Luthardt J, Becker GA, Patt M, Stumvoll M, Blüher M, Villringer A, Arelin K, Meyer PM, Bresch A, Sabri O, Hesse S, Pleger B. Sex differences in serotonin-hypothalamic connections underpin a diminished sense of emotional well-being with increasing body weight. Int J Obes (Lond) 2016; 40:1268-77. [PMID: 27102051 DOI: 10.1038/ijo.2016.63] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Revised: 01/11/2016] [Accepted: 01/28/2016] [Indexed: 12/27/2022]
Abstract
BACKGROUND/OBJECTIVES The neurobiological mechanisms linking obesity to emotional distress related to weight remain largely unknown. PARTICIPANTS/METHODS Here we combined positron emission tomography, using the serotonin transporter (5-HTT) radiotracer [(11)C]-3-amino-4-(2-dimethylaminomethylphenylsulfanyl)-benzonitrile, with functional connectivity magnetic resonance imaging, the Beck Depression Inventory (BDI-II) and the Impact of Weight on Quality of Life-Lite questionnaire (IWQOL-Lite) to investigate the role of central serotonin in the severity of depression (BDI-II), as well as in the loss of emotional well-being with body weight (IWQOL-Lite). RESULTS In a group of lean to morbidly obese individuals (n=28), we found sex differences in the 5-HTT availability-related connectivity of the hypothalamus. Males (n=11) presented a strengthened connectivity to the lateral orbitofrontal cortex, whereas in females (n=17) we found strengethened projections to the ventral striatum. Both regions are known as reward regions involved in mediating the emotional response to food. Their resting-state activity correlated positively to the body mass index (BMI) and IWQOL-Lite scores, suggesting that each region in both sexes also underpins a diminished sense of emotional well-being with body weight. Contrarily to males, we found that in females also the BDI-II positively correlated with the BMI and by trend with the activity in ventral striatum, suggesting that in females an increased body weight may convey to other mood dimensions than those weight-related ones included in the IWQOL-Lite. CONCLUSIONS This study suggests sex differences in serotonin-hypothalamic connections to brain regions of the reward circuitry underpinning a diminished sense of emotional well-being with an increasing body weight.
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Affiliation(s)
- J Melasch
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - M Rullmann
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - A Hilbert
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany
| | - J Luthardt
- Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - G A Becker
- Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - M Patt
- Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - M Stumvoll
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Medical Department III, University Hospital Leipzig, Leipzig, Germany
| | - M Blüher
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Medical Department III, University Hospital Leipzig, Leipzig, Germany
| | - A Villringer
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.,Clinic for Cognitive Neurology, University Hospital Leipzig, Leipzig, Germany
| | - K Arelin
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.,Clinic for Cognitive Neurology, University Hospital Leipzig, Leipzig, Germany
| | - P M Meyer
- Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - A Bresch
- Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - O Sabri
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - S Hesse
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Department of Nuclear Medicine, University Hospital Leipzig, Leipzig, Germany
| | - B Pleger
- IFB Adiposity Diseases, University Medical Centre, Leipzig, Germany.,Department of Neurology, Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.,Clinic for Cognitive Neurology, University Hospital Leipzig, Leipzig, Germany.,BG University Clinic Bergmannsheil, Department of Neurology, Ruhr University Bochum, Bochum, Germany
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83
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Caron A, Labbé SM, Mouchiroud M, Huard R, Lanfray D, Richard D, Laplante M. DEPTOR in POMC neurons affects liver metabolism but is dispensable for the regulation of energy balance. Am J Physiol Regul Integr Comp Physiol 2016; 310:R1322-31. [PMID: 27097662 DOI: 10.1152/ajpregu.00549.2015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 04/18/2016] [Indexed: 11/22/2022]
Abstract
We have recently demonstrated that specific overexpression of DEP-domain containing mTOR-interacting protein (DEPTOR) in the mediobasal hypothalamus (MBH) protects mice against high-fat diet-induced obesity, revealing DEPTOR as a significant contributor to energy balance regulation. On the basis of evidence that DEPTOR is expressed in the proopiomelanocortin (POMC) neurons of the MBH, the present study aimed to investigate whether these neurons mediate the metabolic effects of DEPTOR. Here, we report that specific DEPTOR overexpression in POMC neurons does not recapitulate any of the phenotypes observed when the protein was overexpressed in the MBH. Unlike the previous model, mice overexpressing DEPTOR only in POMC neurons 1) did not show differences in feeding behavior, 2) did not exhibit changes in locomotion activity and oxygen consumption, 3) did not show an improvement in systemic glucose metabolism, and 4) were not resistant to high-fat diet-induced obesity. These results support the idea that other neuronal populations are responsible for these phenotypes. Nonetheless, we observed a mild elevation in fasting blood glucose, insulin resistance, and alterations in liver glucose and lipid homeostasis in mice overexpressing DEPTOR in POMC neurons. Taken together, these results show that DEPTOR overexpression in POMC neurons does not affect energy balance regulation but could modulate metabolism through a brain-liver connection.
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Affiliation(s)
- Alexandre Caron
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, Quebec, Canada; and Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada.,Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Sébastien M Labbé
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, Quebec, Canada; and Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada.,Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Mathilde Mouchiroud
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, Quebec, Canada; and Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada.,Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Renaud Huard
- Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Damien Lanfray
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, Quebec, Canada; and Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada.,Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Denis Richard
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, Quebec, Canada; and Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada.,Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada
| | - Mathieu Laplante
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Quebec, Quebec, Canada; and Département de Médecine, Faculté de Médecine, Université Laval, Québec, Québec, Canada
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84
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Allen SJ, Garcia-Galiano D, Borges BC, Burger LL, Boehm U, Elias CF. Leptin receptor null mice with reexpression of LepR in GnRHR expressing cells display elevated FSH levels but remain in a prepubertal state. Am J Physiol Regul Integr Comp Physiol 2016; 310:R1258-66. [PMID: 27101301 DOI: 10.1152/ajpregu.00529.2015] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 04/08/2016] [Indexed: 11/22/2022]
Abstract
Leptin signals energy sufficiency to the reproductive hypothalamic-pituitary-gonadal (HPG) axis. Studies using genetic models have demonstrated that hypothalamic neurons are major players mediating these effects. Leptin receptor (LepR) is also expressed in the pituitary gland and in the gonads, but the physiological effects of leptin in these sites are still unclear. Female mice with selective deletion of LepR in a subset of gonadotropes show normal pubertal development but impaired fertility. Conditional deletion approaches, however, often result in redundancy or developmental adaptations, which may compromise the assessment of leptin's action in gonadotropes for pubertal maturation. To circumvent these issues, we adopted a complementary genetic approach and assessed if selective reexpression of LepR only in gonadotropes is sufficient to enable puberty and improve fertility of LepR null female mice. We initially assessed the colocalization of gonadotropin-releasing hormone receptor (GnRHR) and LepR in the HPG axis using GnRHR-IRES-Cre (GRIC) and LepR-Cre reporter (tdTomato or enhanced green fluorescent protein) mice. We found that GRIC and leptin-induced phosphorylation of STAT3 are expressed in distinct hypothalamic neurons. Whereas LepR-Cre was observed in theca cells, GRIC expression was rarely found in the ovarian parenchyma. In contrast, a subpopulation of gonadotropes expressed the LepR-Cre reporter gene (tdTomato). We then crossed the GRIC mice with the LepR null reactivable (LepR(loxTB)) mice. These mice showed an increase in FSH levels, but they remained in a prepubertal state. Together with previous findings, our data indicate that leptin-selective action in gonadotropes serves a role in adult reproductive physiology but is not sufficient to allow pubertal maturation in mice.
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Affiliation(s)
- Susan J Allen
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
| | - David Garcia-Galiano
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
| | - Beatriz C Borges
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
| | - Laura L Burger
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
| | - Ulrich Boehm
- Department of Pharmacology and Toxicology, University of Saarland School of Medicine, Homburg, Germany; and
| | - Carol F Elias
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan; Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, Michigan
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85
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Kim J, Yun EY, Park SW, Goo TW, Seo M. Allomyrina Dichotoma Larvae Regulate Food Intake and Body Weight in High Fat Diet-Induced Obese Mice Through mTOR and Mapk Signaling Pathways. Nutrients 2016; 8:100. [PMID: 26901224 PMCID: PMC4772062 DOI: 10.3390/nu8020100] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 02/02/2016] [Accepted: 02/04/2016] [Indexed: 11/24/2022] Open
Abstract
Recent evidence has suggested that the Korean horn beetle (Allomyrina dichotoma) has anti-hepatofibrotic, anti-neoplastic, and antibiotic effects and is recognized as a traditional medicine. In our previous works, Allomyrina dichotoma larvae (ADL) inhibited differentiation of adipocytes both in vitro and in vivo. However, the anorexigenic and endoplasmic reticulum(ER) stress-reducing effects of ADL in obesity has not been examined. In this study, we investigated the anorexigenic and ER stress-reducing effects of ADL in the hypothalamus of diet-induced obese (DIO) mice. Intracerebroventricular (ICV) administration of ethanol extract of ADL (ADE) suggested that an antagonizing effect on ghrelin-induced feeding behavior through the mTOR and MAPK signaling pathways. Especially, ADE resulted in strong reduction of ER stress both in vitro and in vivo. These findings strongly suggest that ADE and its constituent bioactive compounds are available and valuable to use for treatment of various diseases driven by prolonged ER stress.
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Affiliation(s)
- Jongwan Kim
- Department of Anatomy, Graduate School of Dongguk University College of Medicine, Gyeongju 38066, Korea.
| | - Eun-Young Yun
- Department of Agricultural Biology, National Academy of Agricultural Science, RDA, Wanju-gun 55365, Korea.
| | - Seong-Won Park
- Department of Biotechnology, Catholic University of Daegu, Daegu 38430, Korea.
| | - Tae-Won Goo
- Department of Biochemistry, Dongguk University College of Medicine, Gyeongju 38066, Korea.
| | - Minchul Seo
- Department of Agricultural Biology, National Academy of Agricultural Science, RDA, Wanju-gun 55365, Korea.
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86
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Mediobasal hypothalamic overexpression of DEPTOR protects against high-fat diet-induced obesity. Mol Metab 2015; 5:102-112. [PMID: 26909318 PMCID: PMC4735664 DOI: 10.1016/j.molmet.2015.11.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 11/18/2015] [Accepted: 11/25/2015] [Indexed: 01/29/2023] Open
Abstract
Background/Objective The mechanistic target of rapamycin (mTOR) is a serine–threonine kinase that functions into distinct protein complexes (mTORC1 and mTORC2) that regulate energy homeostasis. DEP-domain containing mTOR-interacting protein (DEPTOR) is part of these complexes and is known to dampen mTORC1 function, consequently reducing mTORC1 negative feedbacks and promoting insulin signaling and Akt/PKB activation in several models. Recently, we observed that DEPTOR is expressed in several structures of the brain including the mediobasal hypothalamus (MBH), a region that regulates energy balance. Whether DEPTOR in the MBH plays a functional role in regulating energy balance and hypothalamic insulin signaling has never been tested. Methods We have generated a novel conditional transgenic mouse model based on the Cre-LoxP system allowing targeted overexpression of DEPTOR. Mice overexpressing DEPTOR in the MBH were subjected to a metabolic phenotyping and MBH insulin signaling was evaluated. Results We first report that systemic (brain and periphery) overexpression of DEPTOR prevents high-fat diet-induced obesity, improves glucose metabolism and protects against hepatic steatosis. These phenotypes were associated with a reduction in food intake and feed efficiency and an elevation in oxygen consumption. Strikingly, specific overexpression of DEPTOR in the MBH completely recapitulated these phenotypes. DEPTOR overexpression was associated with an increase in hypothalamic insulin signaling, as illustrated by elevated Akt/PKB activation. Conclusion Altogether, these results support a role for MBH DEPTOR in the regulation of energy balance and metabolism. Systemic (brain and peripheral) overexpression of DEPTOR promotes activity and improves glucose homeostasis. Systemic (brain and peripheral) overexpression of DEPTOR protects againts high-fat diet-induced obesity and metabolic alterations. Deptor is widely expressed in the mouse brain, with a high expression in the mediobasal hypothalamus (MBH), a key region of the brain that regulates energy balance. MBH-specific DEPTOR overexpression improves glucose metabolism and protects mice against obesity. MBH-specific DEPTOR overexpression promotes hypothalamic Akt/PKB signaling.
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87
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Mazza R, Gattuso A, Filice M, Cantafio P, Cerra MC, Angelone T, Imbrogno S. Nesfatin-1 as a new positive inotrope in the goldfish (Carassius auratus) heart. Gen Comp Endocrinol 2015; 224:160-7. [PMID: 26248227 DOI: 10.1016/j.ygcen.2015.08.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 07/27/2015] [Accepted: 08/01/2015] [Indexed: 10/23/2022]
Abstract
The hypothalamic neuropeptide Nesfatin-1 is present in both mammals and teleosts in which it elicits anorexigenic effects. In mammals, Nesfatin-1 acts on the heart by inducing negative inotropism and lusitropism, and cardioprotection against ischemic damages. We evaluated whether in teleosts, Nesfatin-1 also influences cardiac performance. In the goldfish (Carassius auratus), mature, fully processed Nesfatin-1 was detected in brain, gills, intestine and skeletal muscle, but not in the cardiac ventricle. However, on the isolated and perfused working goldfish heart, exogenous Nesfatin-1 induced a positive inotropic effect, revealed by a dose-dependent increase of stroke volume (SV) and stroke work (SW). Positive inotropism was abolished by inhibition of adenylate cyclase (AC; MDL123330A) and cAMP-dependent kinase (PKA; KT5720), suggesting a cAMP/PKA-mediated pathway. This was confirmed by the increased cAMP concentrations revealed by ELISA on Nesfatin-1-treated hearts. Perfusion with Diltiazem, Thapsigargin and PD98059 showed the involvement of L-type calcium channels, SERCA2a pumps and ERK1/2, respectively. The role of ERK1/2 and phospholamban in Nesfatin-1-induced cardiostimulation was supported by Western blotting analysis. In conclusion, this is the first report showing that in teleosts, Nesfatin-1 potentiates mechanical cardiac performance, strongly supporting the evolutionary importance of the peptide in the control of the cardiac function of vertebrates.
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Affiliation(s)
- R Mazza
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Arcavacata di Rende (CS), Italy
| | - A Gattuso
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Arcavacata di Rende (CS), Italy
| | - M Filice
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Arcavacata di Rende (CS), Italy
| | - P Cantafio
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Arcavacata di Rende (CS), Italy
| | - M C Cerra
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Arcavacata di Rende (CS), Italy
| | - T Angelone
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Arcavacata di Rende (CS), Italy
| | - S Imbrogno
- Dept. of Biology, Ecology and Earth Sciences (B.E.ST), University of Calabria, Arcavacata di Rende (CS), Italy.
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88
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Tasker JG, Chen C, Fisher MO, Fu X, Rainville JR, Weiss GL. Endocannabinoid Regulation of Neuroendocrine Systems. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2015; 125:163-201. [PMID: 26638767 DOI: 10.1016/bs.irn.2015.09.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The hypothalamus is a part of the brain that is critical for sustaining life through its homeostatic control and integrative regulation of the autonomic nervous system and neuroendocrine systems. Neuroendocrine function in mammals is mediated mainly through the control of pituitary hormone secretion by diverse neuroendocrine cell groups in the hypothalamus. Cannabinoid receptors are expressed throughout the hypothalamus, and endocannabinoids have been found to exert pronounced regulatory effects on neuroendocrine function via modulation of the outputs of several neuroendocrine systems. Here, we review the physiological regulation of neuroendocrine function by endocannabinoids, focusing on the role of endocannabinoids in the neuroendocrine regulation of the stress response, food intake, fluid homeostasis, and reproductive function. Cannabis sativa (marijuana) has a long history of recreational and/or medicinal use dating back to ancient times. It was used as an analgesic, anesthetic, and antianxiety herb as early as 2600 B.C. The hedonic, anxiolytic, and mood-elevating properties of cannabis have also been cited in ancient records from different cultures. However, it was not until 1964 that the psychoactive constituent of cannabis, Δ(9)-tetrahydrocannabinol, was isolated and its chemical structure determined (Gaoni & Mechoulam, 1964).
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Affiliation(s)
- Jeffrey G Tasker
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, USA; Neuroscience Program, Tulane University, New Orleans, Louisiana, USA.
| | - Chun Chen
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, USA
| | - Marc O Fisher
- Neuroscience Program, Tulane University, New Orleans, Louisiana, USA
| | - Xin Fu
- Neuroscience Program, Tulane University, New Orleans, Louisiana, USA
| | - Jennifer R Rainville
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, USA
| | - Grant L Weiss
- Department of Cell and Molecular Biology, Tulane University, New Orleans, Louisiana, USA
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89
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Protective effect of carbenoxolone on ER stress-induced cell death in hypothalamic neurons. Biochem Biophys Res Commun 2015; 468:793-9. [PMID: 26577412 DOI: 10.1016/j.bbrc.2015.11.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 11/05/2015] [Indexed: 12/26/2022]
Abstract
Hypothalamic endoplasmic reticulum (ER) stress is known to be increased in obesity. Induction of ER stress on hypothalamic neurons has been reported to cause hypothalamic neuronal apoptosis and malfunction of energy balance, leading to obesity. Carbenoxolone is an 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) inhibitor that converts inactive glucocorticoid into an active form. In addition to its metabolic effect via enzyme inhibitory action, carbenoxolone has shown anti-apoptotic activity in several studies. In this study, the direct effects of carbenoxolone on ER stress and cell death in hypothalamic neurons were investigated. Carbenoxolone attenuated tunicamycin induced ER stress-mediated molecules such as spliced XBP1, ATF4, ATF6, CHOP, and ROS generation. In vivo study also revealed that carbenoxolone decreased tunicamycin-induced ER stress in the hypothalamus. In conclusion, the results of this study show that carbenoxolone has protective effects against tunicamycin induced-ER stress and apoptosis in hypothalamic neurons, suggesting its direct protective effects against obesity. Further study is warranted to clarify the effects of carbenoxolone on hypothalamic regulation of energy balance in obesity.
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90
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Seoane-Collazo P, Fernø J, Gonzalez F, Diéguez C, Leis R, Nogueiras R, López M. Hypothalamic-autonomic control of energy homeostasis. Endocrine 2015; 50:276-91. [PMID: 26089260 DOI: 10.1007/s12020-015-0658-y] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 06/06/2015] [Indexed: 10/23/2022]
Abstract
Regulation of energy homeostasis is tightly controlled by the central nervous system (CNS). Several key areas such as the hypothalamus and brainstem receive and integrate signals conveying energy status from the periphery, such as leptin, thyroid hormones, and insulin, ultimately leading to modulation of food intake, energy expenditure (EE), and peripheral metabolism. The autonomic nervous system (ANS) plays a key role in the response to such signals, innervating peripheral metabolic tissues, including brown and white adipose tissue (BAT and WAT), liver, pancreas, and skeletal muscle. The ANS consists of two parts, the sympathetic and parasympathetic nervous systems (SNS and PSNS). The SNS regulates BAT thermogenesis and EE, controlled by central areas such as the preoptic area (POA) and the ventromedial, dorsomedial, and arcuate hypothalamic nuclei (VMH, DMH, and ARC). The SNS also regulates lipid metabolism in WAT, controlled by the lateral hypothalamic area (LHA), VMH, and ARC. Control of hepatic glucose production and pancreatic insulin secretion also involves the LHA, VMH, and ARC as well as the dorsal vagal complex (DVC), via splanchnic sympathetic and the vagal parasympathetic nerves. Muscle glucose uptake is also controlled by the SNS via hypothalamic nuclei such as the VMH. There is recent evidence of novel pathways connecting the CNS and ANS. These include the hypothalamic AMP-activated protein kinase-SNS-BAT axis which has been demonstrated to be a key modulator of thermogenesis. In this review, we summarize current knowledge of the role of the ANS in the modulation of energy balance.
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Affiliation(s)
- Patricia Seoane-Collazo
- NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain.
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Santiago de Compostela, Spain.
| | - Johan Fernø
- NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain
- Department of Clinical Science, K. G. Jebsen Center for Diabetes Research, University of Bergen, 5021, Bergen, Norway
| | - Francisco Gonzalez
- Department of Surgery, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain
- Service of Ophthalmology, Complejo Hospitalario Universitario de Santiago de Compostela, 15706, Santiago de Compostela, Spain
| | - Carlos Diéguez
- NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Santiago de Compostela, Spain
| | - Rosaura Leis
- Unit of Investigation in Nutrition, Growth and Human Development of Galicia, Pediatric Department (USC), Complexo Hospitalario Universitario de Santiago (IDIS/SERGAS), Santiago de Compostela, Spain
| | - Rubén Nogueiras
- NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Santiago de Compostela, Spain
| | - Miguel López
- NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782, Santiago de Compostela, Spain.
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706, Santiago de Compostela, Spain.
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Abstract
Leptin is an adipocytokine that circulates in proportion to body fat to signal the repletion of long-term energy stores. Leptin acts via its receptor, LepRb, on specialized neuronal populations in the brain (mainly in the hypothalamus and brainstem) to alter motivation and satiety, as well as to permit energy expenditure and appropriate glucose homeostasis. Decreased leptin, as with prolonged caloric restriction, promotes a powerful orexigenic signal, decreases energy use via a number of neuroendocrine and autonomic axes, and disrupts glucose homeostasis. Here, we review what is known about cellular leptin action and focus on the roles for specific populations of LepRb-expressing neurons for leptin action.
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Affiliation(s)
- Jonathan N Flak
- Division of Metabolism, Endocrinology and Diabetes (J.N.F., M.G.M.), Department of Internal Medicine, and Department of Molecular and Integrative Physiology (M.G.M.), University of Michigan, Ann Arbor, Michigan 48109
| | - Martin G Myers
- Division of Metabolism, Endocrinology and Diabetes (J.N.F., M.G.M.), Department of Internal Medicine, and Department of Molecular and Integrative Physiology (M.G.M.), University of Michigan, Ann Arbor, Michigan 48109
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92
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Cardi V, Leppanen J, Treasure J. The effects of negative and positive mood induction on eating behaviour: A meta-analysis of laboratory studies in the healthy population and eating and weight disorders. Neurosci Biobehav Rev 2015; 57:299-309. [DOI: 10.1016/j.neubiorev.2015.08.011] [Citation(s) in RCA: 164] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 08/03/2015] [Accepted: 08/18/2015] [Indexed: 12/15/2022]
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93
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Mirzaei K, Hossein-nezhad A, Keshavarz SA, Koohdani F, Eshraghian MR, Saboor-Yaraghi AA, Hosseini S, Chamari M, Zareei M, Djalali M. Association of nesfatin-1 level with body composition, dietary intake and resting metabolic rate in obese and morbid obese subjects. Diabetes Metab Syndr 2015; 9:292-298. [PMID: 25470645 DOI: 10.1016/j.dsx.2014.04.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
AIMS Nesfatin-1 identified neuroendocrine peptide is involved in regulation of homeostasis via modulation of metabolism, energy homeostasis and food intake. We aimed to investigate the associations of circulating nesfatin-1 level with food intake, body composition and resting metabolic rate (RMR) and also examine the correlation between circulating peroxisome proliferator-activated receptor gamma (PPARγ) and nesfatin-1 levels in obese and morbid obese subjects. METHODS A total of 96 obese subjects (including 18 morbid obese subjects) were participated in the current cross-sectional study. We assessed the body composition with the use of Body Composition Analyzer. RMR was measured by means of the MetaCheck™, an instrument designed to measure RMR using indirect calorimetry. All baseline blood samples were obtained following an overnight fasting. Plasma concentrations of nesfatin-1 and circulating PPARγ were measured with the use of an ELISA method. Statistical analyses were performed using SPSS. RESULTS We found significant associations between fat percent and circulating nesfatin-1 in obese and morbid obese subjects. There was main association between circulating nesfatin-1 and PPARγ concentration in obese subjects and it was more strong association in morbid obese participants. There was marginally significant differences between percent predicted RMR between different categorized nesfatin-1 levels. There were also higher intakes of calorie, carbohydrate and protein in obese group who had lower concentration of nesfatin-1. CONCLUSIONS Our data indicated the fat percent as main determinant factor in circulating nesfatin-1 level. It appears nesfatin-1 and PPARγ might be concurrently involved in adipogenesis pathway.
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Affiliation(s)
- Khadijeh Mirzaei
- Cellular and Molecular Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Arash Hossein-nezhad
- Tehran University of Medical Sciences, Tehran, Iran; Department of Medicine, Section of Endocrinology, Nutrition, and Diabetes, Vitamin D, Skin and Bone Research Laboratory, Boston University Medical Center, Boston, MA, United States
| | - Seyed Ali Keshavarz
- Clinical Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Fariba Koohdani
- Cellular and Molecular Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Eshraghian
- Department of Statistics, School of Public Health and Institute of Public Health Research, Tehran University of Medical Sciences, Tehran, Iran
| | - Ali Akbar Saboor-Yaraghi
- Cellular and Molecular Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Saeed Hosseini
- Clinical Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Chamari
- Cellular and Molecular Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahnaz Zareei
- Cellular and Molecular Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahmoud Djalali
- Cellular and Molecular Nutrition Department, School of Nutritional Science and Dietetics, Tehran University of Medical Sciences, Tehran, Iran.
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94
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Elson AE, Simerly RB. Developmental specification of metabolic circuitry. Front Neuroendocrinol 2015; 39:38-51. [PMID: 26407637 PMCID: PMC4681622 DOI: 10.1016/j.yfrne.2015.09.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Revised: 09/18/2015] [Accepted: 09/21/2015] [Indexed: 01/16/2023]
Abstract
The hypothalamus contains a core circuitry that communicates with the brainstem and spinal cord to regulate energy balance. Because metabolic phenotype is influenced by environmental variables during perinatal development, it is important to understand how these neural pathways form in order to identify key signaling pathways that are responsible for metabolic programming. Recent progress in defining gene expression events that direct early patterning and cellular specification of the hypothalamus, as well as advances in our understanding of hormonal control of central neuroendocrine pathways, suggest several key regulatory nodes that may represent targets for metabolic programming of brain structure and function. This review focuses on components of central circuitry known to regulate various aspects of energy balance and summarizes what is known about their developmental neurobiology within the context of metabolic programming.
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Affiliation(s)
- Amanda E Elson
- The Saban Research Institute, Children's Hospital Los Angeles, University of Southern California, Keck School of Medicine, Los Angeles, CA 90027, USA
| | - Richard B Simerly
- The Saban Research Institute, Children's Hospital Los Angeles, University of Southern California, Keck School of Medicine, Los Angeles, CA 90027, USA.
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95
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Differential expression of hypothalamic, metabolic and inflammatory genes in response to short-term calorie restriction in juvenile obese- and lean-prone JCR rats. Nutr Diabetes 2015; 5:e178. [PMID: 26302065 PMCID: PMC4558559 DOI: 10.1038/nutd.2015.28] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 07/08/2015] [Accepted: 07/21/2015] [Indexed: 01/02/2023] Open
Abstract
Background: Childhood obesity is an important early predictor of adult obesity and associated comorbidities. Common forms of obesity are underpinned by both environmental and genetic factors. However, the rising prevalence of obesity in genetically stable populations strongly suggests that contemporary lifestyle is a premier factor to the disease. In pediatric population, the current treatment/prevention options for obesity are lifestyle interventions such as caloric restriction (CR) and increase physical activity. In obese individuals, CR improves many metabolic parameters in peripheral tissues. Little is known about the effect of CR on the hypothalamus. This study aimed to assess the effect of CR on hypothalamic metabolic gene expression of young obese- and lean-prone animals. Methods: Male juvenile JCR:LA-cp obese-prone rats were freely fed (Obese-FF) or pair fed (Obese-FR) to lean-prone, free-feeding animals (Lean-FF). A group of lean-prone rats (Lean-FR) were matched for relative average degree of CR to Obese-FR rats. Results: In free-feeding conditions, obese-prone rats consumed more energy than lean-prone rats (P<0.001) and showed greater increases in body weight, fat mass, plasma glucose, insulin and lipids (P<0.01). These metabolic differences were associated with alterations of feeding-related neuropeptides expression in the hypothalamus, as well as pro-inflammatory cytokines and oxidative stress markers. When submitted to the same degree of CR, the two genotypes responded differently; hypothalamic inflammatory and oxidative stress gene expression was improved in Obese-FR, while it was worsened in Lean-FR rats. Conclusions: We demonstrate in JCR rats that the metabolic and inflammatory response of the brain to CR is genotype dependent.
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96
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Kabaran S, Besler HT. Do fatty acids affect fetal programming? JOURNAL OF HEALTH, POPULATION, AND NUTRITION 2015; 33:14. [PMID: 26825664 PMCID: PMC5025983 DOI: 10.1186/s41043-015-0018-9] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 06/26/2015] [Indexed: 05/29/2023]
Abstract
BACKGROUND In this study discussed the primary and regulatory roles of fatty acids, and investigated the affects of fatty acids on metabolic programming. METHODS Review of the literature was carried out on three electronic databases to assess the roles of fatty acids in metabolic programming. All abstracts and full-text articles were examined, and the most relevant articles were selected for screening and inclusion in this review. RESULTS The mother's nutritional environment during fetal period has important effects on long term health. Fatty acids play a primary role in growth and development. Alterations in fatty acid intake in the fetal period may increase the risk of obesity and metabolic disorders in later life. Maternal fatty acid intakes during pregnancy and lactation are passed to the fetus and the newborn via the placenta and breast milk, respectively. Imbalances in fatty acid intake during the fetal period change the fatty acid composition of membrane phospholipids, which can cause structural and functional problems in cells. Additionally, the metabolic and neuroendocrine environments of the fetus and the newborn play key roles in the regulation of energy balance. CONCLUSIONS Imbalances in fatty acid intake during pregnancy and lactation may result in permanent changes in appetite control, neuroendocrine function and energy metabolism in the fetus, leading to metabolic programming. Further studies are needed to determine the role of fatty acid intake in metabolic programming.
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Affiliation(s)
- Seray Kabaran
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Eastern Mediterranean University, Famagusta, T.R. North Cyprus via Mersin 10, Turkey.
| | - H Tanju Besler
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Hacettepe University, Samanpazarı/Ankara, Turkey
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97
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Ramanjaneya M, Tan BK, Rucinski M, Kawan M, Hu J, Kaur J, Patel VH, Malendowicz LK, Komarowska H, Lehnert H, Randeva HS. Nesfatin-1 inhibits proliferation and enhances apoptosis of human adrenocortical H295R cells. J Endocrinol 2015; 226:1-11. [PMID: 25869615 DOI: 10.1530/joe-14-0496] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/30/2015] [Indexed: 11/08/2022]
Abstract
NUCB2/nesfatin and its proteolytically cleaved product nesfatin-1 are recently discovered anorexigenic hypothalamic neuroproteins involved in energy homeostasis. It is expressed both centrally and in peripheral tissues, and appears to have potent metabolic actions. NUCB2/nesfatin neurons are activated in response to stress. Central nesfatin-1 administration elevates circulating ACTH and corticosterone levels. Bilateral adrenalectomy increased NUCB2/nesfatin mRNA levels in rat paraventricular nuclei. To date, studies have not assessed the effects of nesfatin-1 stimulation on human adrenocortical cells. Therefore, we investigated the expression and effects of nesfatin-1 in a human adrenocortical cell model (H295R). Our findings demonstrate that NUCB2 and nesfatin-1 are expressed in human adrenal gland and human adrenocortical cells (H295R). Stimulation with nesfatin-1 inhibits the growth of H295R cells and promotes apoptosis, potentially via the involvement of Bax, BCL-XL and BCL-2 genes as well as ERK1/2, p38 and JNK1/2 signalling cascades. This has implications for understanding the role of NUCB2/nesfatin in adrenal zonal development. NUCB2/nesfatin may also be a therapeutic target for adrenal cancer. However, further studies using in vivo models are needed to clarify these concepts.
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Affiliation(s)
- Manjunath Ramanjaneya
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Bee K Tan
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Marcin Rucinski
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Mohamed Kawan
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Jiamiao Hu
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Jaspreet Kaur
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Vanlata H Patel
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Ludwik K Malendowicz
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Hanna Komarowska
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Hendrik Lehnert
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK
| | - Harpal S Randeva
- Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal Medicine, University of Medical Sciences, 16 Karol Marcinkowski, Poznan, Poland1st Medical DepartmentUniversity of Lübeck Medical School, Lübeck, GermanyDepartment of DiabetesEndocrinology and Metabolism, University Hospital, Coventry CV2 2DX, UKAston Medical Research InstituteSchool of Life and Health Sciences, Aston University, Birmingham, UK Warwick Medical SchoolUniversity of Warwick, Coventry CV4 7AL, UKInterim Translational Research InstituteAcademic Health System, Hamad Medical Corporation, Doha, QatarDepartment of Obstetrics and GynaecologyBirmingham Heartlands Hospital, Heart of England NHS Foundation Trust, Birmingham, UKDepartment of Histology and EmbryologyPoznan University of Medical Sciences, Poznan, PolandDepartment of EndocrinologyMetabolism and Internal
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98
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Dube S, Errazuriz-Cruzat I, Basu A, Basu R. The forgotten role of glucose effectiveness in the regulation of glucose tolerance. Curr Diab Rep 2015; 15:605. [PMID: 25869240 DOI: 10.1007/s11892-015-0605-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Glucose effectiveness (SG) is the ability of glucose per se to stimulate its own uptake and to suppress its own production under basal/constant insulin concentrations. In an individual, glucose tolerance is a function of insulin secretion, insulin action and SG. Under conditions of declining insulin secretion and action (e.g. type 2 diabetes), the degree of SG assumes increasing significance in determining the level of glucose tolerance both in fasted and postprandial states. Although the importance of SG has been recognized for years, mechanisms that contribute to SG are poorly understood. Research data on modulation of SG and its impact in glucose intolerance is limited. In this review, we will focus on the role of SG in the regulation of glucose tolerance, its evaluation, and potential advantages of therapies that can enhance glucose-induced stimulation of glucose uptake and suppression of its own production in conditions of impaired insulin secretion and action.
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Affiliation(s)
- Simmi Dube
- Gandhi Medical College, Bhopal, MP, India
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99
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Saravani R, Esmaeeli E, Kordi Tamendani M, Nejad MN. Oxytocin Receptor Gene Polymorphisms in Patients With Diabetes. ACTA ACUST UNITED AC 2015. [DOI: 10.17795/gct-27904] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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100
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Sadagurski M, Landeryou T, Cady G, Bartke A, Bernal-Mizrachi E, Miller RA. Transient early food restriction leads to hypothalamic changes in the long-lived crowded litter female mice. Physiol Rep 2015; 3:e12379. [PMID: 25907790 PMCID: PMC4425981 DOI: 10.14814/phy2.12379] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 03/19/2015] [Accepted: 03/25/2015] [Indexed: 12/27/2022] Open
Abstract
Transient nutrient restriction in the 3 weeks between birth and weaning (producing "crowded litter" or CL mice) leads to a significant increase in lifespan and is associated with permanent changes in energy homeostasis, leptin, and insulin sensitivity. Here, we show this brief period of early food restriction leads to permanent modulation of the arcuate nucleus of the hypothalamus (ARH), markedly increasing formation of both orexigenic agouti-related peptide (AgRP) and anorexigenic proopiomelanocortin (POMC) projections to the paraventricular nucleus of the hypothalamus (PVH). An additional 4 weeks of caloric restriction, after weaning, does not further intensify the formation of AgRP and POMC projections. Acute leptin stimulation of 12-month-old mice leads to a stronger increase in the levels of hypothalamic pStat3 and cFos activity in CL mice than in controls, suggesting that preweaning food restriction leads to long-lasting enhancement of leptin signaling. In contrast, FoxO1 nuclear exclusion in response to insulin is equivalent in young adult CL and control mice, suggesting that hypothalamic insulin signaling is not modulated by the crowded litter intervention. Markers of hypothalamic reactive gliosis associated with aging, such as Iba1-positive microglia and GFAP-positive astrocytes, are significantly reduced in CL mice as compared to controls at 12 and 22 months of age. Lastly, age-associated overproduction of TNF-α in microglial cells is reduced in CL mice than in age-matched controls. Together, these results suggest that transient early life nutrient deprivation leads to long-term hypothalamic changes which may contribute to the longevity of CL mice.
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Affiliation(s)
- Marianna Sadagurski
- Division of Geriatric and Palliative Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
| | - Taylor Landeryou
- Department of Pathology and Geriatrics Center, University of Michigan, Ann Arbor, Michigan
| | - Gillian Cady
- Department of Pathology and Geriatrics Center, University of Michigan, Ann Arbor, Michigan
| | - Andrzej Bartke
- Department of Internal Medicine-Geriatrics Research, Southern Illinois University School of Medicine, Springfield, Illinois
| | - Ernesto Bernal-Mizrachi
- Division of Metabolism Endocrinology and Diabetes, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan Endocrinology Section, Medical Service, Veterans Affairs Medical Center, Ann Arbor, Michigan
| | - Richard A Miller
- Department of Pathology and Geriatrics Center, University of Michigan, Ann Arbor, Michigan
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