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Qi Y, Lee NJ, Ip CK, Enriquez R, Tasan R, Zhang L, Herzog H. Agrp-negative arcuate NPY neurons drive feeding under positive energy balance via altering leptin responsiveness in POMC neurons. Cell Metab 2023:S1550-4131(23)00177-8. [PMID: 37201523 DOI: 10.1016/j.cmet.2023.04.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 07/14/2022] [Accepted: 04/26/2023] [Indexed: 05/20/2023]
Abstract
Neuropeptide Y (NPY) in the arcuate nucleus (ARC) is known as one of the most critical regulators of feeding. However, how NPY promotes feeding under obese conditions is unclear. Here, we show that positive energy balance, induced by high-fat diet (HFD) or in genetically obese leptin-receptor-deficient mice, leads to elevated Npy2r expression especially on proopiomelanocortin (POMC) neurons, which also alters leptin responsiveness. Circuit mapping identified a subset of ARC agouti-related peptide (Agrp)-negative NPY neurons that control these Npy2r expressing POMC neurons. Chemogenetic activation of this newly discovered circuitry strongly drives feeding, while optogenetic inhibition reduces feeding. Consistent with that, lack of Npy2r on POMC neurons leads to reduced food intake and fat mass. This suggests that under energy surplus conditions, when ARC NPY levels generally drop, high-affinity NPY2R on POMC neurons is still able to drive food intake and enhance obesity development via NPY released predominantly from Agrp-negative NPY neurons.
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Affiliation(s)
- Yue Qi
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW 2010, Australia; St Vincent's Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - Nicola J Lee
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW 2010, Australia; St Vincent's Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - Chi Kin Ip
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW 2010, Australia; St Vincent's Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - Ronaldo Enriquez
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW 2010, Australia
| | - Ramon Tasan
- Department of Pharmacology, Medical University Innsbruck, Innsbruck, Austria
| | - Lei Zhang
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW 2010, Australia; St Vincent's Clinical School, UNSW Sydney, Sydney, NSW, Australia.
| | - Herbert Herzog
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, NSW 2010, Australia; St Vincent's Clinical School, UNSW Sydney, Sydney, NSW, Australia.
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Chavanelle V, Chanon S, Pinteur C, Loizon E, Vial G, Otero YF, Le Joubioux F, Maugard T, Peltier SL, Sirvent P, Morio B. Impact of TOTUM-63, a fibre and polyphenol rich plant-based composition, on gut and pancreatic hormone secretion in diet-induced obese mice. Nutr Metab Cardiovasc Dis 2022; 32:1797-1807. [PMID: 35618560 DOI: 10.1016/j.numecd.2022.04.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 03/14/2022] [Accepted: 04/01/2022] [Indexed: 11/19/2022]
Abstract
BACKGROUND AND AIMS TOTUM-63, a fibre and polyphenol rich plant-based composition, has been demonstrated to significantly improve body weight and glucose homeostasis in animal models of obesity. Our study aimed at exploring whether the mechanisms include modulation of gut (glucose-dependent insulinotropic peptide (GIP), glucagon-like petide-1 (GLP-1), cholecystokinin (CCK), peptide YY (PYY)) and pancreatic (insulin, glucagon) hormones, all important regulators of glucose control, appetite and body weight. METHODS AND RESULTS Male C57BL/6JRJ mice were assigned to either standard chow (CON), high fat diet (HF, 60% energy from fat) or HF-TOTUM-63 (HF diet 60% supplemented with TOTUM-63 2.7%) for 10 weeks. In vivo glucose homeostasis (oral glucose tolerance test (OGTT), intraperitoneal pyruvate tolerance test (ipPTT)), glucose-induced portal vein hormone concentration, gut hormone gene expression and protein content as well as enteroendocrine cell contents were assessed at the end of the dietary intervention. The present study evidenced that TOTUM-63 reduced food intake, limited weight gain and improved glucose and pyruvate tolerance of HF-fed animals. This was associated with an increase in PYY content in the colon, an altered pattern of PYY secretion between fasted and glucose-stimulated states, and with a significant improvement in the portal vein concentration of GLP-1, insulin and glucagon, but not GIP and CCK, in response to glucose stimulation. CONCLUSION Overall, these data suggest that TOTUM-63 might have a specific impact on gut L-cells and on the expression and secretion of GLP-1 and PYY incretins, potentially contributing to the reduced food intake, body weight gain and improved glucose homeostasis.
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Affiliation(s)
| | - Stéphanie Chanon
- Université Lyon, CarMeN Laboratory, INSERM U1060, INRAE U1397, Université Claude Bernard Lyon 1, Pierre Bénite, France; Hospices Civils de Lyon, Faculté de Médecine, Hôpital Lyon Sud, Oullins, France
| | - Claudie Pinteur
- Université Lyon, CarMeN Laboratory, INSERM U1060, INRAE U1397, Université Claude Bernard Lyon 1, Pierre Bénite, France; Hospices Civils de Lyon, Faculté de Médecine, Hôpital Lyon Sud, Oullins, France
| | - Emmanuelle Loizon
- Université Lyon, CarMeN Laboratory, INSERM U1060, INRAE U1397, Université Claude Bernard Lyon 1, Pierre Bénite, France; Hospices Civils de Lyon, Faculté de Médecine, Hôpital Lyon Sud, Oullins, France
| | - Guillaume Vial
- Université Grenoble Alpes, Grenoble, France; Inserm U 1042, Laboratoire INSERM U1042, Hypoxia PathoPhysiology (HP2), Grenoble, France
| | | | | | - Thierry Maugard
- La Rochelle Université - LIENSs UMR CNRS 7266, La Rochelle, France
| | | | | | - Béatrice Morio
- Université Lyon, CarMeN Laboratory, INSERM U1060, INRAE U1397, Université Claude Bernard Lyon 1, Pierre Bénite, France; Hospices Civils de Lyon, Faculté de Médecine, Hôpital Lyon Sud, Oullins, France.
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3
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Langley DB, Schofield P, Jackson J, Herzog H, Christ D. Crystal structures of human neuropeptide Y (NPY) and peptide YY (PYY). Neuropeptides 2022; 92:102231. [PMID: 35180645 DOI: 10.1016/j.npep.2022.102231] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 01/18/2022] [Accepted: 02/03/2022] [Indexed: 10/19/2022]
Abstract
Neuropeptide Y (NPY), peptide YY (PYY) and pancreatic polypeptide (PP) form the evolutionarily conserved pancreatic polypeptide family. While the fold is widely utilized in nature, crystal structures remain elusive, particularly for the human forms, with only the structure of a distant avian form of PP reported. Here we utilize a crystallization chaperone (antibody Fab fragment), specifically recognizing the amidated peptide termini, to solve the structures of human NPY and human PYY. Intriguingly, and despite limited sequence identity (~50%), the structure of human PYY closely resembles that of avian PP, highlighting the broad structural conservation of the fold throughout evolution. Specifically, the PYY structure is characterized by a C-terminal amidated α-helix, preceded by a backfolded poly-proline N-terminus, with the termini in close proximity to each other. In contrast, in the structure of human NPY the N-terminal component is disordered, while the helical component of the peptide is observed in a four-helix bundle type arrangement, consistent with a propensity for multimerization suggested by NMR studies.
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Affiliation(s)
- David B Langley
- Garvan Institute of Medical Research, 384 Victoria St, Darlinghurst, New South Wales 2010, Australia
| | - Peter Schofield
- Garvan Institute of Medical Research, 384 Victoria St, Darlinghurst, New South Wales 2010, Australia
| | - Jenny Jackson
- Garvan Institute of Medical Research, 384 Victoria St, Darlinghurst, New South Wales 2010, Australia
| | - Herbert Herzog
- Garvan Institute of Medical Research, 384 Victoria St, Darlinghurst, New South Wales 2010, Australia; St Vincent's Clinical School, Faculty of Medicine, UNSW, Sydney, Australia
| | - Daniel Christ
- Garvan Institute of Medical Research, 384 Victoria St, Darlinghurst, New South Wales 2010, Australia; St Vincent's Clinical School, Faculty of Medicine, UNSW, Sydney, Australia.
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4
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Del Vecchio G, Murashita K, Verri T, Gomes AS, Rønnestad I. Leptin receptor-deficient (knockout) zebrafish: Effects on nutrient acquisition. Gen Comp Endocrinol 2021; 310:113832. [PMID: 34089707 DOI: 10.1016/j.ygcen.2021.113832] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/22/2021] [Accepted: 06/01/2021] [Indexed: 12/18/2022]
Abstract
In mammals, knockout of LEPR results in a hyperphagic, morbid obese, and diabetic phenotype, which supports that leptin plays an important role in the control of appetite and energy metabolism, and that its receptor, LEPR, mediates these effects. To date, little is known about the role(s) of lepr in teleost physiology. We investigated a zebrafish (Danio rerio) homozygous lepr knockout (lepr-/-) line generated by CRISPR/Cas9 in comparison to its wt counterpart with respect to nutrient acquisition, energy allocation, and metabolism. The metabolic characterization included oxygen consumption rate and morphometric parameters (yolk sac area, standard length, wet weight, and condition factor) as proxies for use and allocation of energy in developing (embryos, larvae, and juveniles) zebrafish and showed no particular differences between the two lines, in agreement with previous studies. One exception was found in oxygen consumption at 72 hpf, when zebrafish switch from embryonic to early larval stages and food-seeking behavior could be observed. In this case, the metabolic rate was significantly lower in lepr-/- than in wt. Both phenotypes showed similar responses, with respect to metabolic rate, to acute alterations (22 and 34 °C) in water temperature (measured in terms of Q10 and activation energy) compared to the standard (28 °C) rearing conditions. To assess lepr involvement in signaling the processing and handling of incoming nutrients when an exogenous meal is digested and absorbed, we conducted an in vivo analysis in lepr-/- and wt early (8 days post-fertilization) zebrafish larvae. The larvae were administered a bolus of protein hydrolysate (0%, 1%, 5%, and 15% lactalbumin) directly into the digestive tract lumen, and changes in the mRNA expression profile before and after (1 and 3 h) administration were quantified. The analysis showed transcriptional differences in the expressions of genes involved in the control of appetite and energy metabolism (cart, npy, agrp, and mc4r), sensing (casr, t1r1, t1r3, t1r2-1, t1r2-2, pept1a, and pept1b), and digestion (cck, pyy, try, ct, and amy), with more pronounced effects observed in the orexigenic than in the anorexigenic pathways, suggesting a role of lepr in their regulations. Differences in the mRNA levels of these genes in lepr-/-vs. wt larvae were also observed. Altogether, our analyses suggest an influence of lepr on physiological processes involved in nutrient acquisition, mainly control of food intake and digestion, during early development, whereas metabolism, energy allocation, and growth seem to be only slightly influenced.
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Affiliation(s)
- Gianmarco Del Vecchio
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Provinciale Lecce-Monteroni, I-73100 Lecce, Italy; Department of Biological Sciences, University of Bergen, PO Box 7803, NO-5020 Bergen, Norway
| | - Koji Murashita
- Department of Biological Sciences, University of Bergen, PO Box 7803, NO-5020 Bergen, Norway; Aquaculture Research Department, Fisheries Technology Institute, Fisheries Research and Education Agency, 224-1 Hiruda, Tamaki, Watarai, Mie 519-0423, Japan
| | - Tiziano Verri
- Department of Biological and Environmental Sciences and Technologies, University of Salento, Via Provinciale Lecce-Monteroni, I-73100 Lecce, Italy
| | - Ana S Gomes
- Department of Biological Sciences, University of Bergen, PO Box 7803, NO-5020 Bergen, Norway
| | - Ivar Rønnestad
- Department of Biological Sciences, University of Bergen, PO Box 7803, NO-5020 Bergen, Norway.
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5
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Powell DR, Revelli JP, Doree DD, DaCosta CM, Desai U, Shadoan MK, Rodriguez L, Mullens M, Yang QM, Ding ZM, Kirkpatrick LL, Vogel P, Zambrowicz B, Sands AT, Platt KA, Hansen GM, Brommage R. High-Throughput Screening of Mouse Gene Knockouts Identifies Established and Novel High Body Fat Phenotypes. Diabetes Metab Syndr Obes 2021; 14:3753-3785. [PMID: 34483672 PMCID: PMC8409770 DOI: 10.2147/dmso.s322083] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 08/04/2021] [Indexed: 01/05/2023] Open
Abstract
PURPOSE Obesity is a major public health problem. Understanding which genes contribute to obesity may better predict individual risk and allow development of new therapies. Because obesity of a mouse gene knockout (KO) line predicts an association of the orthologous human gene with obesity, we reviewed data from the Lexicon Genome5000TM high throughput phenotypic screen (HTS) of mouse gene KOs to identify KO lines with high body fat. MATERIALS AND METHODS KO lines were generated using homologous recombination or gene trapping technologies. HTS body composition analyses were performed on adult wild-type and homozygous KO littermate mice from 3758 druggable mouse genes having a human ortholog. Body composition was measured by either DXA or QMR on chow-fed cohorts from all 3758 KO lines and was measured by QMR on independent high fat diet-fed cohorts from 2488 of these KO lines. Where possible, comparisons were made to HTS data from the International Mouse Phenotyping Consortium (IMPC). RESULTS Body fat data are presented for 75 KO lines. Of 46 KO lines where independent external published and/or IMPC KO lines are reported as obese, 43 had increased body fat. For the remaining 29 novel high body fat KO lines, Ksr2 and G2e3 are supported by data from additional independent KO cohorts, 6 (Asnsd1, Srpk2, Dpp8, Cxxc4, Tenm3 and Kiss1) are supported by data from additional internal cohorts, and the remaining 21 including Tle4, Ak5, Ntm, Tusc3, Ankk1, Mfap3l, Prok2 and Prokr2 were studied with HTS cohorts only. CONCLUSION These data support the finding of high body fat in 43 independent external published and/or IMPC KO lines. A novel obese phenotype was identified in 29 additional KO lines, with 27 still lacking the external confirmation now provided for Ksr2 and G2e3 KO mice. Undoubtedly, many mammalian obesity genes remain to be identified and characterized.
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Affiliation(s)
- David R Powell
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Jean-Pierre Revelli
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Deon D Doree
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Christopher M DaCosta
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Urvi Desai
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Melanie K Shadoan
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Lawrence Rodriguez
- Department of Information Technology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
| | - Michael Mullens
- Department of Information Technology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
| | - Qi M Yang
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Zhi-Ming Ding
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Laura L Kirkpatrick
- Department of Molecular Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
| | - Peter Vogel
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
| | - Brian Zambrowicz
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
- Department of Information Technology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
- Department of Molecular Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
| | - Arthur T Sands
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
- Department of Information Technology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
- Department of Molecular Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
| | - Kenneth A Platt
- Department of Molecular Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
| | - Gwenn M Hansen
- Department of Molecular Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, Tx, USA
| | - Robert Brommage
- Department of Pharmaceutical Biology, Lexicon Pharmaceuticals, Inc, The Woodlands, TX, USA
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6
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Farzi A, Ip CK, Reed F, Enriquez R, Zenz G, Durdevic M, Zhang L, Holzer P, Herzog H. Lack of peptide YY signaling in mice disturbs gut microbiome composition in response to high-fat diet. FASEB J 2021; 35:e21435. [PMID: 33749879 PMCID: PMC8251710 DOI: 10.1096/fj.202002215r] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 01/21/2021] [Accepted: 01/28/2021] [Indexed: 12/17/2022]
Abstract
Peptide YY (PYY), produced by endocrine L cells in the gut, is known for its critical role in regulating gastrointestinal functions as well as satiety. However, how these processes are integrated with maintaining a healthy gut microbiome composition is unknown. Here, we show that lack of PYY in mice leads to distinct changes in gut microbiome composition that are diet‐dependent. While under chow diet only slight differences in gut microbiome composition could be observed, high‐fat diet (HFD) aggravated these differences. Specifically an increased abundance of the Bacteroidetes phylum with a corresponding decrease of the Firmicutes/Bacteroidetes ratio could be detected in Pyy‐knockout (KO) mice in response to HFD. Detailed analysis of the Bacteroidetes phylum further revealed that the Alistipes genus belonging to the Rikenellaceae family, the Parabacteroides belonging to the Tannerellaceae family, as well as Muribaculum were increased in Pyy‐KO mice. In order to investigate whether these changes are associated with changed markers of gut barrier and immunity, we analyzed the colonic expression of various pro‐inflammatory cytokines, as well as tight junction proteins and mucin 2, and identified increased mRNA expression of the tight junction proteins Cldn2 and Ocel1 in Pyy‐KO mice, while pro‐inflammatory cytokine expression was not significantly altered. Together these results highlight a critical gene‐environment interaction between diet and the gut microbiome and its impact on homeostasis of the intestinal epithelium under conditions of reduced PYY signaling which is commonly seen under obese conditions.
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Affiliation(s)
- Aitak Farzi
- Neuroscience Division, Garvan Institute of Medical Research, St. Vincent's Hospital, Darlinghurst, NSW, Australia.,Division of Pharmacology, Otto Loewi Research Center, Medical University of Graz, Graz, Austria
| | - Chi Kin Ip
- Neuroscience Division, Garvan Institute of Medical Research, St. Vincent's Hospital, Darlinghurst, NSW, Australia.,Faculty of Medicine, University of NSW, Sydney, NSW, Australia
| | - Felicia Reed
- Neuroscience Division, Garvan Institute of Medical Research, St. Vincent's Hospital, Darlinghurst, NSW, Australia
| | - Ronaldo Enriquez
- Neuroscience Division, Garvan Institute of Medical Research, St. Vincent's Hospital, Darlinghurst, NSW, Australia
| | - Geraldine Zenz
- Division of Pharmacology, Otto Loewi Research Center, Medical University of Graz, Graz, Austria
| | - Marija Durdevic
- Center for Medical Research, Medical University of Graz, Graz, Austria.,Diagnostic and Research Institute of Pathology, Medical University of Graz, Graz, Austria.,Theodor Escherich Laboratory for Medical Microbiome Research, Medical University of Graz, Graz, Austria
| | - Lei Zhang
- Neuroscience Division, Garvan Institute of Medical Research, St. Vincent's Hospital, Darlinghurst, NSW, Australia.,Faculty of Medicine, University of NSW, Sydney, NSW, Australia
| | - Peter Holzer
- Division of Pharmacology, Otto Loewi Research Center, Medical University of Graz, Graz, Austria
| | - Herbert Herzog
- Neuroscience Division, Garvan Institute of Medical Research, St. Vincent's Hospital, Darlinghurst, NSW, Australia.,Faculty of Medicine, University of NSW, Sydney, NSW, Australia
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7
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de Guia RM, Hassing AS, Ma T, Plucinska K, Holst B, Gerhart-Hines Z, Emanuelli B, Treebak JT. Ablation of Nampt in AgRP neurons leads to neurodegeneration and impairs fasting- and ghrelin-mediated food intake. FASEB J 2021; 35:e21450. [PMID: 33788980 DOI: 10.1096/fj.202002740r] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/15/2021] [Accepted: 02/01/2021] [Indexed: 12/13/2022]
Abstract
Agouti-related protein (AgRP) neurons in the arcuate nucleus of the hypothalamus regulates food intake and whole-body metabolism. NAD+ regulates multiple cellular processes controlling energy metabolism. Yet, its role in hypothalamic AgRP neurons to control food intake is poorly understood. Here, we aimed to assess whether genetic deletion of nicotinamide phosphoribosyltransferase (Nampt), a rate-limiting enzyme in NAD+ production, affects AgRP neuronal function to impact whole-body metabolism and food intake. Metabolic parameters during fed and fasted states, and upon systemic ghrelin and leptin administration were studied in AgRP-specific Nampt knockout (ARNKO) mice. We monitored neuropeptide expression levels and density of AgRP neurons in ARNKO mice from embryonic to adult age. NPY cells were used to determine effects of NAMPT inhibition on neuronal viability, energy status, and oxidative stress in vitro. In these cells, NAD+ depletion reduced ATP levels, increased oxidative stress, and promoted cell death. Agrp expression in the hypothalamus of ARNKO mice gradually decreased after weaning due to progressive AgRP neuron degeneration. Adult ARNKO mice had normal glucose and insulin tolerance, but exhibited an elevated respiratory exchange ratio (RER) when fasted. Remarkably, fasting-induced food intake was unaffected in ARNKO mice when evaluated in metabolic cages, but fasting- and ghrelin-induced feeding and body weight gain decreased in ARNKO mice when evaluated outside metabolic cages. Collectively, deletion of Nampt in AgRP neurons causes progressive neurodegeneration and impairs fasting and ghrelin responses in a context-dependent manner. Our data highlight an essential role of Nampt in AgRP neuron function and viability.
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Affiliation(s)
- Roldan Medina de Guia
- Integrative Metabolism and Environmental Influences, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Anna S Hassing
- Integrative Metabolism and Environmental Influences, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Tao Ma
- Integrative Metabolism and Environmental Influences, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Kaja Plucinska
- Integrative Metabolism and Environmental Influences, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Birgitte Holst
- Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Zach Gerhart-Hines
- Integrative Metabolism and Environmental Influences, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Brice Emanuelli
- Integrative Metabolism and Environmental Influences, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jonas T Treebak
- Integrative Metabolism and Environmental Influences, Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
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8
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The Roles of Neuropeptide Y ( Npy) and Peptide YY ( Pyy) in Teleost Food Intake: A Mini Review. Life (Basel) 2021; 11:life11060547. [PMID: 34200824 PMCID: PMC8230510 DOI: 10.3390/life11060547] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 06/05/2021] [Accepted: 06/08/2021] [Indexed: 12/12/2022] Open
Abstract
Neuropeptide Y family (NPY) is a potent orexigenic peptide and pancreatic polypeptide family comprising neuropeptide Y (Npy), peptide YYa (Pyya), and peptide YYb (Pyyb), which was previously known as peptide Y (PY), and tetrapod pancreatic polypeptide (PP), but has not been exhaustively documented in fish. Nonetheless, Npy and Pyy to date have been the key focus of countless research studies categorizing their copious characteristics in the body, which, among other things, include the mechanism of feeding behavior, cortical neural activity, heart activity, and the regulation of emotions in teleost. In this review, we focused on the role of neuropeptide Y gene (Npy) and peptide YY gene (Pyy) in teleost food intake. Feeding is essential in fish to ensure growth and perpetuation, being indispensable in the aquaculture settings where growth is prioritized. Therefore, a better understanding of the roles of these genes in food intake in teleost could help determine their feeding regime, regulation, growth, and development, which will possibly be fundamental in fish culture.
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9
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Tyszkiewicz-Nwafor M, Jowik K, Dutkiewicz A, Krasinska A, Pytlinska N, Dmitrzak-Weglarz M, Suminska M, Pruciak A, Skowronska B, Slopien A. Neuropeptide Y and Peptide YY in Association with Depressive Symptoms and Eating Behaviours in Adolescents across the Weight Spectrum: From Anorexia Nervosa to Obesity. Nutrients 2021; 13:nu13020598. [PMID: 33670342 PMCID: PMC7917982 DOI: 10.3390/nu13020598] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 02/04/2021] [Accepted: 02/08/2021] [Indexed: 12/28/2022] Open
Abstract
Neuropeptide Y (NPY) and peptide YY (PYY) are involved in metabolic regulation. The purpose of the study was to assess the serum levels of NPY and PYY in adolescents with anorexia nervosa (AN) or obesity (OB), as well as in a healthy control group (CG). The effects of potential confounders on their concentrations were also analysed. Eighty-nine adolescents were included in this study (AN = 30, OB = 30, and CG = 29). Anthropometric measurements and psychometric assessment of depressive symptoms, eating behaviours, body attitudes, and fasting serum levels of NPY and PYY were analysed. The AN group presented severe depressive symptoms, while the OB group held different attitudes towards the body. The levels of NPY were lower in the AN and OB groups as compared with the CG. The PYY levels were higher in the OB group than in the AN group and the CG. The severity of eating disorder symptoms predicted fasting serum concentrations of NPY. Lower levels of NPY in AN, as well as in OB suggests the need to look for a common link in the mechanism of this effect. Higher level of PYY in OB may be important in explaining complex etiopathogenesis of the disease. The psychopathological symptoms may have an influence on the neurohormones regulating metabolism.
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Affiliation(s)
- Marta Tyszkiewicz-Nwafor
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (K.J.); (A.D.); (N.P.); (A.S.)
- Correspondence:
| | - Katarzyna Jowik
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (K.J.); (A.D.); (N.P.); (A.S.)
| | - Agata Dutkiewicz
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (K.J.); (A.D.); (N.P.); (A.S.)
| | - Agata Krasinska
- Department of Pediatric Diabetes and Obesity, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (A.K.); (M.S.); (B.S.)
| | - Natalia Pytlinska
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (K.J.); (A.D.); (N.P.); (A.S.)
| | - Monika Dmitrzak-Weglarz
- Psychiatric Genetics Unit, Department of Psychiatry, Poznan University of Medical Sciences, 61-701 Poznan, Poland;
| | - Marta Suminska
- Department of Pediatric Diabetes and Obesity, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (A.K.); (M.S.); (B.S.)
| | - Agata Pruciak
- Institute of Plant Protection—National Research Institute, Research Centre of Quarantine, Invasive and Genetically Modified Organisms, 60-318 Poznan, Poland;
| | - Bogda Skowronska
- Department of Pediatric Diabetes and Obesity, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (A.K.); (M.S.); (B.S.)
| | - Agnieszka Slopien
- Department of Child and Adolescent Psychiatry, Poznan University of Medical Sciences, 61-701 Poznan, Poland; (K.J.); (A.D.); (N.P.); (A.S.)
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10
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Wu Y, He H, Cheng Z, Bai Y, Ma X. The Role of Neuropeptide Y and Peptide YY in the Development of Obesity via Gut-brain Axis. Curr Protein Pept Sci 2019; 20:750-758. [PMID: 30678628 DOI: 10.2174/1389203720666190125105401] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 12/30/2018] [Accepted: 01/11/2019] [Indexed: 12/15/2022]
Abstract
Obesity is one of the main challenges of public health in the 21st century. Obesity can induce a series of chronic metabolic diseases, such as diabetes, dyslipidemia, hypertension and nonalcoholic fatty liver, which seriously affect human health. Gut-brain axis, the two-direction pathway formed between enteric nervous system and central nervous system, plays a vital role in the occurrence and development of obesity. Gastrointestinal signals are projected through the gut-brain axis to nervous system, and respond to various gastrointestinal stimulation. The central nervous system regulates visceral activity through the gut-brain axis. Brain-gut peptides have important regulatory roles in the gut-brain axis. The brain-gut peptides of the gastrointestinal system and the nervous system regulate the gastrointestinal movement, feeling, secretion, absorption and other complex functions through endocrine, neurosecretion and paracrine to secrete peptides. Both neuropeptide Y and peptide YY belong to the pancreatic polypeptide family and are important brain-gut peptides. Neuropeptide Y and peptide YY have functions that are closely related to appetite regulation and obesity formation. This review describes the role of the gutbrain axis in regulating appetite and maintaining energy balance, and the functions of brain-gut peptides neuropeptide Y and peptide YY in obesity. The relationship between NPY and PYY and the interaction between the NPY-PYY signaling with the gut microbiota are also described in this review.
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Affiliation(s)
- Yi Wu
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
| | - Hengxun He
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
| | - Zhibin Cheng
- College of Animal Science and Technology, Yunnan Agricultural University, Kunming, Yunan 650201, China
| | - Yueyu Bai
- Animal Health Supervision of Henan province, Breeding Animal Genetic Performance Measurement Center of Henan province, Zhengzhou, Henan 450008, China.,Henan Institute of Science and Technology, Xinxiang, Henan 453003, China
| | - Xi Ma
- State Key Lab of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China
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11
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Chapelot D, Charlot K. Physiology of energy homeostasis: Models, actors, challenges and the glucoadipostatic loop. Metabolism 2019; 92:11-25. [PMID: 30500561 DOI: 10.1016/j.metabol.2018.11.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/25/2018] [Accepted: 11/19/2018] [Indexed: 12/16/2022]
Abstract
The aim of this review is to discuss the physiology of energy homeostasis (EH), which is a debated concept. Thus, we will see that the set-point theory is highly challenged and that other models integrating an anticipative component, such as energy allostasis, seem more relevant to experimental reports and life preservation. Moreover, the current obesity epidemic suggests that EH is poorly efficient in the modern human dietary environment. Non-homeostatic phenomena linked to hedonism and reward seem to profoundly impair EH. In this review, the apparent failed homeostatic responses to energy challenges such as exercise, cafeteria diet, overfeeding and diet-induced weight loss, as well as their putative determinants, are analyzed to highlight the mechanisms of EH. Then, the hormonal, neuronal, and metabolic factors of energy intake or energy expenditure are briefly presented. Last, this review focuses on the contributions of two of the most pivotal and often overlooked determinants of EH: the availability of endogenous energy and the pattern of energy intake. A glucoadipostatic loop model is finally proposed to link energy stored in adipose tissue to EH through changes in eating behavior via leptin and sympathetic nervous system activity.
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Affiliation(s)
- Didier Chapelot
- Université Paris 13, Centre de Recherche en Epidémiologie et Statistique, Equipe de Recherche en Epidémiologie Nutritionnelle (EREN), Inserm (U1153), Inra (U1125), Cnam, Bobigny, France.
| | - Keyne Charlot
- Institut de Recherche Biomédicale des Armées, Unité de Physiologie des Exercices et Activités en Conditions Extrêmes, Département Environnements Opérationnels, Brétigny-sur-Orge, France
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12
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Zhou C, Lei L, Yuan D, Deng X, Ye H, Luo H, Fang J, Yang M, Li Y, Zhang C, Zhou J, Wang J, Zeng B, Zhu C, Li B, Zheng Z. Structural and functional characterization of peptide YY on feeding in Schizothorax davidi. JOURNAL OF EXPERIMENTAL ZOOLOGY PART 2018; 329:55-61. [PMID: 29855171 DOI: 10.1002/jez.2166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 04/09/2018] [Accepted: 04/13/2018] [Indexed: 11/10/2022]
Abstract
Several studies have demonstrated that the neuropeptide peptide YY (PYY) plays an important role in feeding in mammals and fish. However, thus far, the feeding regulation function of PYY in Schizothorax davidi has not been well understood. Here, we identified the full-length cDNA sequence of PYY in S. davidi for the first time. S. davidi PYY contains 803 bp nucleotides including a 328 bp 3' untranslated region (UTR), a 181 bp 5' UTR, and a 294 bp open reading frame encoding a peptide of 97 amino acids. S. davidi PYY expression was observed in almost all tissues, with the highest expression detected in the hypothalamus. PYY mRNA expression in the hypothalamus was significantly elevated after a meal (P < 0.01), and significantly decreased after fasting (P < 0.01). PYY expression levels were increased sharply following refeeding after 9 days (P < 0.01), suggesting that it might function as a satiety factor in S. davidi.
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Affiliation(s)
- Chaowei Zhou
- College of Animal Science, Southwest University, Chongqing, People's Republic of China.,Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet, People's Republic of China
| | - Luo Lei
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Dengyue Yuan
- Department of Aquaculture, College of Life Sciences, Neijiang Normal University, Neijiang, Sichuan, People's Republic of China
| | - Xingxing Deng
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Hua Ye
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Hui Luo
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Jiayang Fang
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Minmin Yang
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Yan Li
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Chi Zhang
- Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet, People's Republic of China
| | - Jianshe Zhou
- Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet, People's Republic of China
| | - Jian Wang
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Benhe Zeng
- Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet, People's Republic of China
| | - Chengke Zhu
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
| | - Baohai Li
- Tibet Academy of Agricultural and Animal Husbandry Sciences, Lhasa, Tibet, People's Republic of China
| | - Zonglin Zheng
- College of Animal Science, Southwest University, Chongqing, People's Republic of China
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13
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Shen Y, Guo X, Han C, Wan F, Ma K, Guo S, Wang L, Xia Y, Liu L, Lin Z, Huang J, Xiong N, Wang T. The implication of neuronimmunoendocrine (NIE) modulatory network in the pathophysiologic process of Parkinson's disease. Cell Mol Life Sci 2017; 74:3741-3768. [PMID: 28623510 PMCID: PMC11107509 DOI: 10.1007/s00018-017-2549-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 05/23/2017] [Accepted: 05/29/2017] [Indexed: 01/11/2023]
Abstract
Parkinson's disease (PD) is a progressive neurodegenerative disorder implicitly marked by the substantia nigra dopaminergic neuron degeneration and explicitly characterized by the motor and non-motor symptom complexes. Apart from the nigrostriatal dopamine depletion, the immune and endocrine study findings are also frequently reported, which, in fact, have helped to broaden the symptom spectrum and better explain the pathogenesis and progression of PD. Nevertheless, based on the neural, immune, and endocrine findings presented above, it is still difficult to fully recapitulate the pathophysiologic process of PD. Therefore, here, in this review, we have proposed the neuroimmunoendocrine (NIE) modulatory network in PD, aiming to achieve a more comprehensive interpretation of the pathogenesis and progression of this disease. As a matter of fact, in addition to the classical motor symptoms, NIE modulatory network can also underlie the non-motor symptoms such as gastrointestinal, neuropsychiatric, circadian rhythm, and sleep disorders in PD. Moreover, the dopamine (DA)-melatonin imbalance in the retino-diencephalic/mesencephalic-pineal axis also provides an alternative explanation for the motor complications in the process of DA replacement therapy. In conclusion, the NIE network can be expected to deepen our understanding and facilitate the multi-dimensional management and therapy of PD in future clinical practice.
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Affiliation(s)
- Yan Shen
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Xingfang Guo
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Chao Han
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Fang Wan
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Kai Ma
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Shiyi Guo
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Luxi Wang
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Yun Xia
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Ling Liu
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Zhicheng Lin
- Division of Alcohol and Drug Abuse, Department of Psychiatry, and Mailman Neuroscience Research Center, McLean Hospital, Harvard Medical School, Belmont, MA, 02478, USA
| | - Jinsha Huang
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Nian Xiong
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China
| | - Tao Wang
- Department of Neurology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan, 430022, Hubei, China.
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14
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Sun WW, Zhu P, Shi YC, Zhang CL, Huang XF, Liang SY, Song ZY, Lin S. Current views on neuropeptide Y and diabetes-related atherosclerosis. Diab Vasc Dis Res 2017; 14:277-284. [PMID: 28423914 DOI: 10.1177/1479164117704380] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Diabetes-induced atherosclerotic cardiovascular disease is the leading cause of death of diabetic patients. Neuronal regulation plays a critical role in glucose metabolism and cardiovascular function under physiological and pathological conditions, among which, neurotransmitter neuropeptide Y has been shown to be closely involved in these two processes. Elevated central neuropeptide Y level promotes food intake and reduces energy expenditure, thereby increasing adiposity. Neuropeptide Y is co-localized with noradrenaline in central and sympathetic nervous systems. As a major peripheral vascular contractive neurotransmitter, through interactions with its receptors, neuropeptide Y has been implicated in the pathology and progression of diabetes, by promoting the proliferation of endothelial cells and vascular fibrosis, which may contribute to diabetes-induced cardiovascular disease. Neuropeptide Y also participates in the pathogenesis of atherosclerosis, the major form of cardiovascular disease, via aggravating endothelial dysfunction, growth of vascular smooth muscle cells, formation of foam cells and platelets aggregation. This review highlights the causal role of neuropeptide Y and its receptor system in the development of diabetes mellitus and one of its complications: atherosclerotic cardiovascular disease. The information from this review provides both critical insights onto the mechanisms underlying the pathogenesis of atherosclerosis and evidence for the development of therapeutic strategies.
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Affiliation(s)
- Wei-Wei Sun
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Ping Zhu
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Yan-Chuan Shi
- 2 Neuroscience Division, Garvan Institute of Medical Research, Sydney, NSW, Australia
| | - Chen-Liang Zhang
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Xu-Feng Huang
- 3 School of Health Sciences and Illawarra Health and Medical Research Institute, University of Wollongong Australia, Wollongong, NSW, Australia
| | - Shi-Yu Liang
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Zhi-Yuan Song
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | - Shu Lin
- 1 Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
- 3 School of Health Sciences and Illawarra Health and Medical Research Institute, University of Wollongong Australia, Wollongong, NSW, Australia
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15
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Cross-talk between innate cytokines and the pancreatic polypeptide family in acute pancreatitis. Cytokine 2017; 90:161-168. [DOI: 10.1016/j.cyto.2016.11.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 11/22/2016] [Indexed: 01/11/2023]
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16
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Volkoff H. The Neuroendocrine Regulation of Food Intake in Fish: A Review of Current Knowledge. Front Neurosci 2016; 10:540. [PMID: 27965528 PMCID: PMC5126056 DOI: 10.3389/fnins.2016.00540] [Citation(s) in RCA: 168] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 11/07/2016] [Indexed: 12/14/2022] Open
Abstract
Fish are the most diversified group of vertebrates and, although progress has been made in the past years, only relatively few fish species have been examined to date, with regards to the endocrine regulation of feeding in fish. In fish, as in mammals, feeding behavior is ultimately regulated by central effectors within feeding centers of the brain, which receive and process information from endocrine signals from both brain and peripheral tissues. Although basic endocrine mechanisms regulating feeding appear to be conserved among vertebrates, major physiological differences between fish and mammals and the diversity of fish, in particular in regard to feeding habits, digestive tract anatomy and physiology, suggest the existence of fish- and species-specific regulating mechanisms. This review provides an overview of hormones known to regulate food intake in fish, emphasizing on major hormones and the main fish groups studied to date.
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Affiliation(s)
- Helene Volkoff
- Departments of Biology and Biochemistry, Memorial University of NewfoundlandSt. John's, NL, Canada
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17
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Su Y, Foppen E, Fliers E, Kalsbeek A. Effects of Intracerebroventricular Administration of Neuropeptide Y on Metabolic Gene Expression and Energy Metabolism in Male Rats. Endocrinology 2016; 157:3070-85. [PMID: 27267712 DOI: 10.1210/en.2016-1083] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Neuropeptide Y (NPY) is an important neurotransmitter in the control of energy metabolism. Several studies have shown that obesity is associated with increased levels of NPY in the hypothalamus. We hypothesized that the central release of NPY has coordinated and integrated effects on energy metabolism in different tissues, resulting in increased energy storage and decreased energy expenditure (EE). We first investigated the acute effects of an intracerebroventricular (ICV) infusion of NPY on gene expression in liver, brown adipose tissue, soleus muscle, and sc and epididymal white adipose tissue (WAT). We found increased expression of genes involved in gluconeogenesis and triglyceride secretion in the liver already 2-hour after the start of the NPY administration. In brown adipose tissue, the expression of thermogenic genes was decreased. In sc WAT, the expression of genes involved in lipogenesis was increased, whereas in soleus muscle, the expression of lipolytic genes was decreased after ICV NPY. These findings indicate that the ICV infusion of NPY acutely and simultaneously increases lipogenesis and decreases lipolysis in different tissues. Subsequently, we investigated the acute effects of ICV NPY on locomotor activity, respiratory exchange ratio, EE, and body temperature. The ICV infusion of NPY increased locomotor activity, body temperature, and EE as well as respiratory exchange ratio. Together, these results show that an acutely increased central availability of NPY results in a shift of metabolism towards lipid storage and an increased use of carbohydrates, while at the same time increasing activity, EE, and body temperature.
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Affiliation(s)
- Yan Su
- Hypothalamic Integration Mechanisms (Y.S., A.K.), Netherlands Institute for Neuroscience, 1105 BA Amsterdam, The Netherlands; and Department of Endocrinology and Metabolism (E.Fo.,E.Fl., A.K.), Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
| | - Ewout Foppen
- Hypothalamic Integration Mechanisms (Y.S., A.K.), Netherlands Institute for Neuroscience, 1105 BA Amsterdam, The Netherlands; and Department of Endocrinology and Metabolism (E.Fo.,E.Fl., A.K.), Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
| | - Eric Fliers
- Hypothalamic Integration Mechanisms (Y.S., A.K.), Netherlands Institute for Neuroscience, 1105 BA Amsterdam, The Netherlands; and Department of Endocrinology and Metabolism (E.Fo.,E.Fl., A.K.), Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
| | - Andries Kalsbeek
- Hypothalamic Integration Mechanisms (Y.S., A.K.), Netherlands Institute for Neuroscience, 1105 BA Amsterdam, The Netherlands; and Department of Endocrinology and Metabolism (E.Fo.,E.Fl., A.K.), Academic Medical Center, University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
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18
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Wagner L, Wolf R, Zeitschel U, Rossner S, Petersén Å, Leavitt BR, Kästner F, Rothermundt M, Gärtner UT, Gündel D, Schlenzig D, Frerker N, Schade J, Manhart S, Rahfeld JU, Demuth HU, von Hörsten S. Proteolytic degradation of neuropeptide Y (NPY) from head to toe: Identification of novel NPY-cleaving peptidases and potential drug interactions in CNS and Periphery. J Neurochem 2015; 135:1019-37. [PMID: 26442809 DOI: 10.1111/jnc.13378] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 09/09/2015] [Accepted: 09/14/2015] [Indexed: 01/24/2023]
Abstract
The bioactivity of neuropeptide Y (NPY) is either N-terminally modulated with respect to receptor selectivity by dipeptidyl peptidase 4 (DP4)-like enzymes or proteolytic degraded by neprilysin or meprins, thereby abrogating signal transduction. However, neither the subcellular nor the compartmental differentiation of these regulatory mechanisms is fully understood. Using mass spectrometry, selective inhibitors and histochemistry, studies across various cell types, body fluids, and tissues revealed that most frequently DP4-like enzymes, aminopeptidases P, secreted meprin-A (Mep-A), and cathepsin D (CTSD) rapidly hydrolyze NPY, depending on the cell type and tissue under study. Novel degradation of NPY by cathepsins B, D, L, G, S, and tissue kallikrein could also be identified. The expression of DP4, CTSD, and Mep-A at the median eminence indicates that the bioactivity of NPY is regulated by peptidases at the interphase between the periphery and the CNS. Detailed ex vivo studies on human sera and CSF samples recognized CTSD as the major NPY-cleaving enzyme in the CSF, whereas an additional C-terminal truncation by angiotensin-converting enzyme could be detected in serum. The latter finding hints to potential drug interaction between antidiabetic DP4 inhibitors and anti-hypertensive angiotensin-converting enzyme inhibitors, while it ablates suspected hypertensive side effects of only antidiabetic DP4-inhibitors application. The bioactivity of neuropeptide Y (NPY) is either N-terminally modulated with respect to receptor selectivity by dipeptidyl peptidase 4 (DP4)-like enzymes or proteolytic degraded by neprilysin or meprins, thereby abrogating signal transduction. However, neither the subcellular nor the compartmental differentiation of these regulatory mechanisms is fully understood. Using mass spectrometry, selective inhibitors and histochemistry, studies across various cell types, body fluids, and tissues revealed that most frequently DP4-like enzymes, aminopeptidases P, secreted meprin-A (Mep-A), and cathepsin D (CTSD) rapidly hydrolyze NPY, depending on the cell type and tissue under study. Novel degradation of NPY by cathepsins B, D, L, G, S, and tissue kallikrein could also be identified. The expression of DP4, CTSD, and Mep-A at the median eminence indicates that the bioactivity of NPY is regulated by peptidases at the interphase between the periphery and the CNS. Detailed ex vivo studies on human sera and CSF samples recognized CTSD as the major NPY-cleaving enzyme in the CSF, whereas an additional C-terminal truncation by angiotensin-converting enzyme could be detected in serum. The latter finding hints to potential drug interaction between antidiabetic DP4 inhibitors and anti-hypertensive angiotensin-converting enzyme inhibitors, while it ablates suspected hypertensive side effects of only antidiabetic DP4-inhibitors application.
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Affiliation(s)
- Leona Wagner
- Deutschsprachige Selbsthilfegruppe für Alkaptonurie (DSAKU) e.V., Stuttgart, Germany.,Probiodrug AG, Halle, Germany.,Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
| | | | - Ulrike Zeitschel
- Paul-Flechsig-Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | - Steffen Rossner
- Paul-Flechsig-Institute for Brain Research, University of Leipzig, Leipzig, Germany
| | - Åsa Petersén
- Translational Neuroendocrine Research Unit, Lund University, Lund, Sweden
| | - Blair R Leavitt
- Department of Medical Genetics, Centre for Molecular Medicine and Therapeutics, University of British Columbia and Children's and Women's Hospital, Vancouver, BC, Canada
| | - Florian Kästner
- Department of Psychiatry, University of Muenster, Muenster, Germany
| | - Matthias Rothermundt
- Department of Psychiatry, University of Muenster, Muenster, Germany.,St. Rochus-Hospital Telgte, Telgte, Germany
| | | | - Daniel Gündel
- Julius Bernstein Institute for Physiology, Martin Luther University of Halle-Wittenberg, Halle, Germany
| | - Dagmar Schlenzig
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, Halle, Germany
| | - Nadine Frerker
- Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
| | - Jutta Schade
- Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
| | | | - Jens-Ulrich Rahfeld
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, Halle, Germany
| | - Hans-Ulrich Demuth
- Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, Halle, Germany
| | - Stephan von Hörsten
- Department of Experimental Therapy, Preclinical Experimental Center, Universitätsklinikum Erlangen, Erlangen, Germany
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19
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Volkoff H. Cloning and tissue distribution of appetite-regulating peptides in pirapitinga (Piaractus brachypomus
). J Anim Physiol Anim Nutr (Berl) 2015; 99:987-1001. [DOI: 10.1111/jpn.12318] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 02/25/2015] [Indexed: 12/16/2022]
Affiliation(s)
- H. Volkoff
- Departments of Biology and Biochemistry; Memorial University of Newfoundland; St. John's NL Canada
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20
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Farzi A, Reichmann F, Holzer P. The homeostatic role of neuropeptide Y in immune function and its impact on mood and behaviour. Acta Physiol (Oxf) 2015; 213:603-27. [PMID: 25545642 DOI: 10.1111/apha.12445] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 11/10/2014] [Accepted: 12/21/2014] [Indexed: 12/18/2022]
Abstract
Neuropeptide Y (NPY), one of the most abundant peptides in the nervous system, exerts its effects via five receptor types, termed Y1, Y2, Y4, Y5 and Y6. NPY's pleiotropic functions comprise the regulation of brain activity, mood, stress coping, ingestion, digestion, metabolism, vascular and immune function. Nerve-derived NPY directly affects immune cells while NPY also acts as a paracrine and autocrine immune mediator, because immune cells themselves are capable of producing and releasing NPY. NPY is able to induce immune activation or suppression, depending on a myriad of factors such as the Y receptors activated and cell types involved. There is an intricate relationship between psychological stress, mood disorders and the immune system. While stress represents a risk factor for the development of mood disorders, it exhibits diverse actions on the immune system as well. Conversely, inflammation is regarded as an internal stressor and is increasingly recognized to contribute to the pathogenesis of mood and metabolic disorders. Intriguingly, the cerebral NPY system has been found to protect against distinct disturbances in response to immune challenge, attenuating the sickness response and preventing the development of depression. Thus, NPY plays an important homeostatic role in balancing disturbances of physiological systems caused by peripheral immune challenge. This implication is particularly evident in the brain in which NPY counteracts the negative impact of immune challenge on mood, emotional processing and stress resilience. NPY thus acts as a unique signalling molecule in the interaction of the immune system with the brain in health and disease.
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Affiliation(s)
- A. Farzi
- Research Unit of Translational Neurogastroenterology; Institute of Experimental and Clinical Pharmacology; Medical University of Graz; Graz Austria
| | - F. Reichmann
- Research Unit of Translational Neurogastroenterology; Institute of Experimental and Clinical Pharmacology; Medical University of Graz; Graz Austria
| | - P. Holzer
- Research Unit of Translational Neurogastroenterology; Institute of Experimental and Clinical Pharmacology; Medical University of Graz; Graz Austria
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Painsipp E, Köfer MJ, Farzi A, Dischinger US, Sinner F, Herzog H, Holzer P. Neuropeptide Y and peptide YY protect from weight loss caused by Bacille Calmette-Guérin in mice. Br J Pharmacol 2014; 170:1014-26. [PMID: 23992467 PMCID: PMC3949650 DOI: 10.1111/bph.12354] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 07/05/2013] [Accepted: 07/23/2013] [Indexed: 01/18/2023] Open
Abstract
Background and Purpose Immune challenge of mice with Bacille Calmette–Guérin (BCG) has been reported to cause transient weight loss and a behavioural sickness response. Although BCG-induced depression involves the kynurenine pathway, weight loss occurs independently of this factor. Because neuropeptide Y (NPY) and peptide YY (PYY) are involved in the regulation of food intake, we hypothesized that they play a role in the BCG-induced weight loss. Experimental Approach Male wild-type, PYY knockout (PYY−/−), NPY knockout (NPY−/−) and NPY−/−;PYY−/− double knockout mice were injected with vehicle or BCG (approximately 108 colony-forming units per mouse), and their weight, locomotion, exploration and ingestion were recorded for 2 weeks post-treatment. Key Results Deletion of PYY and NPY aggravated the BCG-induced loss of body weight, which was most pronounced in NPY−/−;PYY−/− mice (maximum loss: 15%). The weight loss in NPY−/−;PYY−/− mice did not normalize during the 2 week observation period. BCG suppressed the circadian pattern of locomotion, exploration and food intake. However, these changes took a different time course than the prolonged weight loss caused by BCG in NPY−/−;PYY−/− mice. The effect of BCG to increase circulating IL-6 (measured 16 days post-treatment) remained unaltered by knockout of PYY, NPY or NPY plus PYY. Conclusions and Implications These data show that NPY and PYY are both required to protect from the action of BCG-evoked immune challenge to cause prolonged weight loss and disturb energy balance. The findings attest to an important role of NPY and PYY in orchestrating homeostatic reactions to infection and immune stimulation.
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Affiliation(s)
- Evelin Painsipp
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Graz, Austria
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Volkoff H. Appetite regulating peptides in red-bellied piranha, Pygocentrus nattereri: cloning, tissue distribution and effect of fasting on mRNA expression levels. Peptides 2014; 56:116-24. [PMID: 24721336 DOI: 10.1016/j.peptides.2014.03.022] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 03/30/2014] [Accepted: 03/31/2014] [Indexed: 11/24/2022]
Abstract
cDNAs encoding the appetite regulating peptides apelin, cocaine and amphetamine regulated transcript (CART), cholecystokinin (CCK), peptide YY (PYY) and orexin were isolated in red-bellied piranha and their mRNA tissue and brain distributions examined. When compared to other fish, the sequences obtained for all peptides were most similar to that of other Characiforme fish, as well as to Cypriniformes. All peptides were widely expressed within the brain and in several peripheral tissues, including gastrointestinal tract. In order to assess the role of these peptides in the regulation of feeding of red-bellied piranha, we compared the brain mRNA expression levels of these peptides, as well as the gut mRNA expression of CCK and PYY, between fed and 7-day fasted fish. Within the brain, fasting induced a significant increase in both apelin and orexin mRNA expressions and a decrease in CART mRNA expression, but there where were no significant differences for either PYY or CCK brain mRNA expressions between fed and fasted fish. Within the intestine, PYY mRNA expression was lower in fasted fish compared to fed fish but there was no significant difference for CCK intestine mRNA expression between fed and fasted fish. Our results suggest that these peptides, perhaps with the exception of CCK, play a major role in the regulation of feeding of red-bellied piranha.
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Affiliation(s)
- Hélène Volkoff
- Department of Biology, Memorial University of Newfoundland, St. John's, NL A1B 3X9, Canada; Department of Biochemistry, Memorial University of Newfoundland, St. John's, NL A1B 3X9, Canada.
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Schmidt JB, Gregersen NT, Pedersen SD, Arentoft JL, Ritz C, Schwartz TW, Holst JJ, Astrup A, Sjödin A. Effects of PYY3-36 and GLP-1 on energy intake, energy expenditure, and appetite in overweight men. Am J Physiol Endocrinol Metab 2014; 306:E1248-56. [PMID: 24735885 DOI: 10.1152/ajpendo.00569.2013] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Our aim was to examine the effects of GLP-1 and PYY3-36, separately and in combination, on energy intake, energy expenditure, appetite sensations, glucose and fat metabolism, ghrelin, and vital signs in healthy overweight men. Twenty-five healthy male subjects participated in this randomized, double-blinded, placebo-controlled, four-arm crossover study (BMI 29 ± 3 kg/m(2), age 33 ± 9 yr). On separate days they received a 150-min intravenous infusion of 1) 0.8 pmol·kg(-1)·min(-1) PYY3-36, 2) 1.0 pmol·kg(-1)·min(-1) GLP-1, 3) GLP-1 + PYY3-36, or 4) placebo. Ad libitum energy intake was assessed during the final 30 min. Measurements of appetite sensations, energy expenditure and fat oxidation, vital signs, and blood variables were collected throughout the infusion period. No effect on energy intake was found after monoinfusions of PYY3-36 (-4.2 ± 4.8%, P = 0.8) or GLP-1 (-3.0 ± 4.5%, P = 0.9). However, the coinfusion reduced energy intake compared with placebo (-30.4 ± 6.5%, P < 0.0001) and more than the sum of the monoinfusions (P < 0.001), demonstrating a synergistic effect. Coinfusion slightly increased sensation of nausea (P < 0.05), but this effect could not explain the effect on energy intake. A decrease in plasma ghrelin was found after all treatments compared with placebo (all P < 0.05); however, infusions of GLP-1 + PYY3-36 resulted in an additional decrease compared with the monoinfusions (both P < 0.01). We conclude that coinfusion of GLP-1 and PYY3-36 exerted a synergistic effect on energy intake. The satiating effect of the meal was enhanced by GLP-1 and PYY3-36 in combination compared with placebo. Coinfusion was accompanied by slightly increased nausea and a decrease in plasma ghrelin, but neither of these factors could explain the reduction in energy intake.
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Affiliation(s)
- Julie Berg Schmidt
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark;
| | - Nikolaj Ture Gregersen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Sue D Pedersen
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Johanne L Arentoft
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Christian Ritz
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Thue W Schwartz
- Department of Neuroscience and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Jens Juul Holst
- Novo Nordisk Center for Basic Metabolic Research, Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Arne Astrup
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
| | - Anders Sjödin
- Department of Nutrition, Exercise and Sports, Faculty of Science, University of Copenhagen, Copenhagen, Denmark
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Agrawal R, Tyagi E, Vergnes L, Reue K, Gomez-Pinilla F. Coupling energy homeostasis with a mechanism to support plasticity in brain trauma. Biochim Biophys Acta Mol Basis Dis 2014; 1842:535-46. [DOI: 10.1016/j.bbadis.2013.12.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 12/01/2013] [Accepted: 12/10/2013] [Indexed: 12/23/2022]
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Wentzensen N, Bakkum-Gamez JN, Killian JK, Sampson J, Guido R, Glass A, Adams L, Luhn P, Brinton LA, Rush B, d'Ambrosio L, Gunja M, Yang HP, Garcia-Closas M, Lacey JV, Lissowska J, Podratz K, Meltzer P, Shridhar V, Sherman ME. Discovery and validation of methylation markers for endometrial cancer. Int J Cancer 2014; 135:1860-8. [PMID: 24623538 DOI: 10.1002/ijc.28843] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 01/29/2014] [Accepted: 02/20/2014] [Indexed: 01/22/2023]
Abstract
The prognosis of endometrial cancer is strongly associated with stage at diagnosis, suggesting that early detection may reduce mortality. Women who are diagnosed with endometrial carcinoma often have a lengthy history of vaginal bleeding, which offers an opportunity for early diagnosis and curative treatment. We performed DNA methylation profiling on population-based endometrial cancers to identify early detection biomarkers and replicated top candidates in two independent studies. We compared DNA methylation values of 1,500 probes representing 807 genes in 148 population-based endometrial carcinoma samples and 23 benign endometrial tissues. Markers were replicated in another set of 69 carcinomas and 40 benign tissues profiled on the same platform. Further replication was conducted in The Cancer Genome Atlas and in prospectively collected endometrial brushings from women with and without endometrial carcinomas. We identified 114 CpG sites showing methylation differences with p values of ≤ 10(-7) between endometrial carcinoma and normal endometrium. Eight genes (ADCYAP1, ASCL2, HS3ST2, HTR1B, MME, NPY and SOX1) were selected for further replication. Age-adjusted odds ratios for endometrial cancer ranged from 3.44 (95%-CI: 1.33-8.91) for ASCL2 to 18.61 (95%-CI: 5.50-62.97) for HTR1B. An area under the curve (AUC) of 0.93 was achieved for discriminating carcinoma from benign endometrium. Replication in The Cancer Genome Atlas and in endometrial brushings from an independent study confirmed the candidate markers. This study demonstrates that methylation markers may be used to evaluate women with abnormal vaginal bleeding to distinguish women with endometrial carcinoma from the majority of women without malignancy.
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Affiliation(s)
- Nicolas Wentzensen
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD
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Wall A, Volkoff H. Effects of fasting and feeding on the brain mRNA expressions of orexin, tyrosine hydroxylase (TH), PYY and CCK in the Mexican blind cavefish (Astyanax fasciatus mexicanus). Gen Comp Endocrinol 2013; 183:44-52. [PMID: 23305930 DOI: 10.1016/j.ygcen.2012.12.011] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2012] [Revised: 10/21/2012] [Accepted: 12/21/2012] [Indexed: 01/16/2023]
Abstract
The effects of fasting and feeding on the brain expression of orexin (OX), tyrosine hydroxylase (TH), peptide Y (PY) and cholecystokinin (CCK) were examined in the blind cavefish Astyanax fasciatus mexicanus. A 10-days fasting period induced increases in both OX and TH brain mRNA expression but had no effect on PYY and CCK expression. Periprandial changes in expression were seen for OX, TH and PYY but not for CCK. OX brain expression peaked 1h prior to a scheduled meal and decreased 1h post feeding in fed fish. A peak in TH expression was seen 1h post feeding in unfed fish whereas a peak in PYY expression was seen 1h post feeding in fed fish. Our result indicates that brain OX, TH and PYY might be involved in the central regulation of feeding of blind cavefish.
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Affiliation(s)
- Alicia Wall
- Department of Biology, Memorial University of Newfoundland, St. John's, NL, Canada
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