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Haque R, Kurien SP, Setty H, Salzberg Y, Stelzer G, Litvak E, Gingold H, Rechavi O, Oren-Suissa M. Sex-specific developmental gene expression atlas unveils dimorphic gene networks in C. elegans. Nat Commun 2024; 15:4273. [PMID: 38769103 PMCID: PMC11106331 DOI: 10.1038/s41467-024-48369-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 04/24/2024] [Indexed: 05/22/2024] Open
Abstract
Sex-specific traits and behaviors emerge during development by the acquisition of unique properties in the nervous system of each sex. However, the genetic events responsible for introducing these sex-specific features remain poorly understood. In this study, we create a comprehensive gene expression atlas of pure populations of hermaphrodites and males of the nematode Caenorhabditis elegans across development. We discover numerous differentially expressed genes, including neuronal gene families like transcription factors, neuropeptides, and G protein-coupled receptors. We identify INS-39, an insulin-like peptide, as a prominent male-biased gene expressed specifically in ciliated sensory neurons. We show that INS-39 serves as an early-stage male marker, facilitating the effective isolation of males in high-throughput experiments. Through complex and sex-specific regulation, ins-39 plays pleiotropic sexually dimorphic roles in various behaviors, while also playing a shared, dimorphic role in early life stress. This study offers a comparative sexual and developmental gene expression database for C. elegans. Furthermore, it highlights conserved genes that may underlie the sexually dimorphic manifestation of different human diseases.
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Affiliation(s)
- Rizwanul Haque
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
- Department of Molecular Neuroscience, Weizmann Institute of Science, Rehovot, Israel
| | - Sonu Peedikayil Kurien
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
- Department of Molecular Neuroscience, Weizmann Institute of Science, Rehovot, Israel
| | - Hagar Setty
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
- Department of Molecular Neuroscience, Weizmann Institute of Science, Rehovot, Israel
| | - Yehuda Salzberg
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
- Department of Molecular Neuroscience, Weizmann Institute of Science, Rehovot, Israel
| | - Gil Stelzer
- Department of Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | - Einav Litvak
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Hila Gingold
- Department of Neurobiology, Wise Faculty of Life Sciences & Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Oded Rechavi
- Department of Neurobiology, Wise Faculty of Life Sciences & Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Meital Oren-Suissa
- Department of Brain Sciences, Weizmann Institute of Science, Rehovot, Israel.
- Department of Molecular Neuroscience, Weizmann Institute of Science, Rehovot, Israel.
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2
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Robinson SL, Bendrath SC, Yates EM, Thiele TE. Basolateral amygdala neuropeptide Y system modulates binge ethanol consumption. Neuropsychopharmacology 2024; 49:690-698. [PMID: 37758802 PMCID: PMC10876546 DOI: 10.1038/s41386-023-01742-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 08/22/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023]
Abstract
Neuropeptide Y (NPY) signaling regulation of corticolimbic communication is known to modulate binge-like ethanol consumption in rodents. In this work we sought to assess the impact of intra-BLA NPY system modulation on binge-like ethanol intake and to assess the role of the NPY1R+ projection from the BLA to the mPFC in this behavior. We used "drinking-in-the-dark" (DID) procedures in C57BL6J mice to address these questions. First, the impact of intra-BLA administration of NPY on binge-like ethanol intake was assessed. Next, the impact of repeated cycles of DID intake on NPY1R expression in the BLA was assessed with use of immunohistochemistry (IHC). Finally, chemogenetic inhibition of BLA→mPFC NPY1R+ projections was assessed to determine if limbic communication with the mPFC was specifically involved in binge-like ethanol intake. Importantly, as both the BLA and NPY system are sexually dimorphic, both sexes were assessed in these studies. Intra-BLA NPY dose-dependently decreased binge-like ethanol intake in males only. Repeated DID reduced NPY1R expression in the BLA of both sexes. Silencing of BLA→mPFC NPY1R+ neurons significantly reduced binge-like ethanol intake in both sexes in a dose-dependent manner. We provide novel evidence that (1) intra-BLA NPY reduces binge-like ethanol intake in males; (2) binge-like ethanol intake reduces NPY1R levels in the BLA; and (3) chemogenetic inhibition of BLA→mPFC NPY1R+ neurons blunts binge-like drinking in male and female mice. These observations provide the first direct evidence that NPY signaling in the BLA, and specifically BLA communication with the mPFC, modulates binge-like ethanol consumption.
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Affiliation(s)
- Stacey L Robinson
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC, 27599-3270, USA
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, NC, 27599-7178, USA
| | - Sophie C Bendrath
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC, 27599-3270, USA
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, NC, 27599-7178, USA
| | - Elizabeth M Yates
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC, 27599-3270, USA
| | - Todd E Thiele
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC, 27599-3270, USA.
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, NC, 27599-7178, USA.
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Kumari R, Pascalau R, Wang H, Bajpayi S, Yurgel M, Quansah K, Hattar S, Tampakakis E, Kuruvilla R. Sympathetic NPY controls glucose homeostasis, cold tolerance, and cardiovascular functions in mice. Cell Rep 2024; 43:113674. [PMID: 38236776 PMCID: PMC10951981 DOI: 10.1016/j.celrep.2024.113674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2023] [Revised: 11/17/2023] [Accepted: 01/01/2024] [Indexed: 01/30/2024] Open
Abstract
Neuropeptide Y (NPY) is best known for its effects in the brain as an orexigenic and anxiolytic agent and in reducing energy expenditure. NPY is also co-expressed with norepinephrine (NE) in sympathetic neurons. Although NPY is generally considered to modulate noradrenergic responses, its specific roles in autonomic physiology remain under-appreciated. Here, we show that sympathetic-derived NPY is essential for metabolic and cardiovascular regulation in mice. NPY and NE are co-expressed in 90% of prevertebral sympathetic neurons and only 43% of paravertebral neurons. NPY-expressing neurons primarily innervate blood vessels in peripheral organs. Sympathetic-specific NPY deletion elicits pronounced metabolic and cardiovascular defects in mice, including reductions in insulin secretion, glucose tolerance, cold tolerance, and pupil size and elevated heart rate, while notably, however, basal blood pressure was unchanged. These findings provide insight into target tissue-specific functions of NPY derived from sympathetic neurons and imply its potential involvement in metabolic and cardiovascular diseases.
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Affiliation(s)
- Raniki Kumari
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Raluca Pascalau
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Hui Wang
- Section on Light and Circadian Rhythms, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA
| | - Sheetal Bajpayi
- Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| | - Maria Yurgel
- Section on Light and Circadian Rhythms, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA
| | - Kwaku Quansah
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA; Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| | - Samer Hattar
- Section on Light and Circadian Rhythms, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA
| | - Emmanouil Tampakakis
- Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA
| | - Rejji Kuruvilla
- Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA.
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4
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Kumari R, Pascalau R, Wang H, Bajpayi S, Yurgel M, Quansah K, Hattar S, Tampakakis E, Kuruvilla R. Sympathetic NPY controls glucose homeostasis, cold tolerance, and cardiovascular functions in mice. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.07.24.550381. [PMID: 37546870 PMCID: PMC10402010 DOI: 10.1101/2023.07.24.550381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
Neuropeptide Y (NPY) is best known for its effects in the brain as an orexigenic and anxiolytic agent and in reducing energy expenditure. NPY is also co-expressed with Norepinephrine (NE) in sympathetic neurons. Although NPY is generally considered to modulate noradrenergic responses, its specific roles in autonomic physiology remain under-appreciated. Here, we show that sympathetic-derived NPY is essential for metabolic and cardiovascular regulation in mice. NPY and NE are co-expressed in 90% of prevertebral sympathetic neurons and only 43% of paravertebral neurons. NPY-expressing neurons primarily innervate blood vessels in peripheral organs. Sympathetic-specific deletion of NPY elicits pronounced metabolic and cardiovascular defects in mice, including reductions in insulin secretion, glucose tolerance, cold tolerance, pupil size, and an elevation in heart rate, while notably, however, basal blood pressure was unchanged. These findings provide new knowledge about target tissue-specific functions of NPY derived from sympathetic neurons and imply its potential involvement in metabolic and cardiovascular diseases.
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Affiliation(s)
- Raniki Kumari
- Department of Biology, Johns Hopkins University, Baltimore, Maryland, 21218, USA
| | - Raluca Pascalau
- Department of Biology, Johns Hopkins University, Baltimore, Maryland, 21218, USA
| | - Hui Wang
- Section on Light and Circadian Rhythms, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892, USA
| | - Sheetal Bajpayi
- Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, Maryland, 21205, USA
| | - Maria Yurgel
- Section on Light and Circadian Rhythms, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892, USA
| | - Kwaku Quansah
- Department of Biology, Johns Hopkins University, Baltimore, Maryland, 21218, USA
- Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, Maryland, 21205, USA
| | - Samer Hattar
- Section on Light and Circadian Rhythms, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland, 20892, USA
| | - Emmanouil Tampakakis
- Division of Cardiology, Johns Hopkins School of Medicine, Baltimore, Maryland, 21205, USA
| | - Rejji Kuruvilla
- Department of Biology, Johns Hopkins University, Baltimore, Maryland, 21218, USA
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5
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Kang X, Ma X, Li H, Jin X, Gao X, Feng D, Wu S. Neuropeptide Y Promotes mTORC1 to Regulate Chondrocyte Proliferation and Hypertrophy. Endocrinology 2023; 164:6967060. [PMID: 36592126 DOI: 10.1210/endocr/bqac213] [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: 09/16/2022] [Revised: 12/19/2022] [Accepted: 12/21/2022] [Indexed: 01/03/2023]
Abstract
Peripheral neuropeptide Y (NPY) has been reported to regulate bone metabolism and homeostasis; however, its potential roles in growth plate chondrogenesis remain unclear. Here, we found that NPY expression decreased during chondrocyte differentiation in vitro and in vivo. NPY was required for chondrocyte proliferation; in contrast, knockdown of NPY facilitated chondrocyte hypertrophic differentiation. Administration of recombinant NPY in rat chondrocytes and metatarsal bones uncoupled normal proliferation and hypertrophic differentiation during chondrogenesis and thereby inhibited growth plate chondrogenesis and longitudinal bone growth. Remarkably, NPY activated the mTORC1 pathway in chondrocytes, whereas attenuation of mTORC1 activity by administration of rapamycin in vitro partially abrogated NPY-mediated effects on chondrocyte proliferation and hypertrophic differentiation. In addition, a combination of Y2R antagonist but not Y1R antagonist with NPY abolished NPY-mediated inhibition of metatarsal growth and growth plate chondrogenesis. Mechanistically, NPY activated Erk1/2 by NPY2R, then phosphorylated ERK1/2 activated mTORC1 to initiate PTHrP expression, which in turn promoted chondrocyte proliferation and inhibited chondrocyte hypertrophic differentiation. In conclusion, our data identified NPY as a crucial regulator of chondrogenesis and may provide a promising therapeutic strategy for skeletal diseases.
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Affiliation(s)
- Xiaomin Kang
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, P.R. China
| | - Xiao Ma
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, P.R. China
| | - Huixia Li
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an 710061, P.R. China
| | - Xinxin Jin
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an 710061, P.R. China
| | - Xin Gao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an 710061, P.R. China
| | - Dongxu Feng
- Hong Hui Hospital, Xi'an Jiaotong University School of Medicine, Xi'an 710061, P.R. China
| | - Shufang Wu
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, P.R. China
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Helman TJ, Headrick JP, Stapelberg NJC, Braidy N. The sex-dependent response to psychosocial stress and ischaemic heart disease. Front Cardiovasc Med 2023; 10:1072042. [PMID: 37153459 PMCID: PMC10160413 DOI: 10.3389/fcvm.2023.1072042] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 04/03/2023] [Indexed: 05/09/2023] Open
Abstract
Stress is an important risk factor for modern chronic diseases, with distinct influences in males and females. The sex specificity of the mammalian stress response contributes to the sex-dependent development and impacts of coronary artery disease (CAD). Compared to men, women appear to have greater susceptibility to chronic forms of psychosocial stress, extending beyond an increased incidence of mood disorders to include a 2- to 4-fold higher risk of stress-dependent myocardial infarction in women, and up to 10-fold higher risk of Takotsubo syndrome-a stress-dependent coronary-myocardial disorder most prevalent in post-menopausal women. Sex differences arise at all levels of the stress response: from initial perception of stress to behavioural, cognitive, and affective responses and longer-term disease outcomes. These fundamental differences involve interactions between chromosomal and gonadal determinants, (mal)adaptive epigenetic modulation across the lifespan (particularly in early life), and the extrinsic influences of socio-cultural, economic, and environmental factors. Pre-clinical investigations of biological mechanisms support distinct early life programming and a heightened corticolimbic-noradrenaline-neuroinflammatory reactivity in females vs. males, among implicated determinants of the chronic stress response. Unravelling the intrinsic molecular, cellular and systems biological basis of these differences, and their interactions with external lifestyle/socio-cultural determinants, can guide preventative and therapeutic strategies to better target coronary heart disease in a tailored sex-specific manner.
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Affiliation(s)
- Tessa J. Helman
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, NSW, Sydney, Australia
- Correspondence: Tessa J. Helman
| | - John P. Headrick
- Schoolof Pharmacy and Medical Sciences, Griffith University, Southport, QLD, Australia
| | | | - Nady Braidy
- Centre for Healthy Brain Ageing, School of Psychiatry, University of New South Wales, NSW, Sydney, Australia
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Williams JA, Burgess S, Suckling J, Lalousis PA, Batool F, Griffiths SL, Palmer E, Karwath A, Barsky A, Gkoutos GV, Wood S, Barnes NM, David AS, Donohoe G, Neill JC, Deakin B, Khandaker GM, Upthegrove R. Inflammation and Brain Structure in Schizophrenia and Other Neuropsychiatric Disorders: A Mendelian Randomization Study. JAMA Psychiatry 2022; 79:498-507. [PMID: 35353173 PMCID: PMC8968718 DOI: 10.1001/jamapsychiatry.2022.0407] [Citation(s) in RCA: 94] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 02/09/2022] [Indexed: 02/02/2023]
Abstract
Importance Previous in vitro and postmortem research suggests that inflammation may lead to structural brain changes via activation of microglia and/or astrocytic dysfunction in a range of neuropsychiatric disorders. Objective To investigate the relationship between inflammation and changes in brain structures in vivo and to explore a transcriptome-driven functional basis with relevance to mental illness. Design, Setting, and Participants This study used multistage linked analyses, including mendelian randomization (MR), gene expression correlation, and connectivity analyses. A total of 20 688 participants in the UK Biobank, which includes clinical, genomic, and neuroimaging data, and 6 postmortem brains from neurotypical individuals in the Allen Human Brain Atlas (AHBA), including RNA microarray data. Data were extracted in February 2021 and analyzed between March and October 2021. Exposures Genetic variants regulating levels and activity of circulating interleukin 1 (IL-1), IL-2, IL-6, C-reactive protein (CRP), and brain-derived neurotrophic factor (BDNF) were used as exposures in MR analyses. Main Outcomes and Measures Brain imaging measures, including gray matter volume (GMV) and cortical thickness (CT), were used as outcomes. Associations were considered significant at a multiple testing-corrected threshold of P < 1.1 × 10-4. Differential gene expression in AHBA data was modeled in brain regions mapped to areas significant in MR analyses; genes were tested for biological and disease overrepresentation in annotation databases and for connectivity in protein-protein interaction networks. Results Of 20 688 participants in the UK Biobank sample, 10 828 (52.3%) were female, and the mean (SD) age was 55.5 (7.5) years. In the UK Biobank sample, genetically predicted levels of IL-6 were associated with GMV in the middle temporal cortex (z score, 5.76; P = 8.39 × 10-9), inferior temporal (z score, 3.38; P = 7.20 × 10-5), fusiform (z score, 4.70; P = 2.60 × 10-7), and frontal (z score, -3.59; P = 3.30 × 10-5) cortex together with CT in the superior frontal region (z score, -5.11; P = 3.22 × 10-7). No significant associations were found for IL-1, IL-2, CRP, or BDNF after correction for multiple comparison. In the AHBA sample, 5 of 6 participants (83%) were male, and the mean (SD) age was 42.5 (13.4) years. Brain-wide coexpression analysis showed a highly interconnected network of genes preferentially expressed in the middle temporal gyrus (MTG), which further formed a highly connected protein-protein interaction network with IL-6 (enrichment test of expected vs observed network given the prevalence and degree of interactions in the STRING database: 43 nodes/30 edges observed vs 8 edges expected; mean node degree, 1.4; genome-wide significance, P = 4.54 × 10-9). MTG differentially expressed genes that were functionally enriched for biological processes in schizophrenia, autism spectrum disorder, and epilepsy. Conclusions and Relevance In this study, genetically determined IL-6 was associated with brain structure and potentially affects areas implicated in developmental neuropsychiatric disorders, including schizophrenia and autism.
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Affiliation(s)
- John A. Williams
- Institute of Cancer and Genomic Sciences, Centre for Computational Biology, University of Birmingham, Birmingham, United Kingdom
- Institute for Translational Medicine, University of Birmingham, Birmingham, United Kingdom
- Health Data Research UK (HRD), Midlands Site, Birmingham, United Kingdom
| | - Stephen Burgess
- Medical Research Council Biostatistics Unit, Cambridge Institute of Public Health, Cambridge, United Kingdom
- Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, United Kingdom
| | - John Suckling
- Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom
| | - Paris Alexandros Lalousis
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
- Centre for Human Brain Health, University of Birmingham, Birmingham, United Kingdom
| | - Fatima Batool
- Medical Research Council Biostatistics Unit, Cambridge Institute of Public Health, Cambridge, United Kingdom
| | - Sian Lowri Griffiths
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
- Centre for Human Brain Health, University of Birmingham, Birmingham, United Kingdom
| | - Edward Palmer
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
| | - Andreas Karwath
- Institute of Cancer and Genomic Sciences, Centre for Computational Biology, University of Birmingham, Birmingham, United Kingdom
- Institute for Translational Medicine, University of Birmingham, Birmingham, United Kingdom
- Health Data Research UK (HRD), Midlands Site, Birmingham, United Kingdom
| | - Andrey Barsky
- Institute of Cancer and Genomic Sciences, Centre for Computational Biology, University of Birmingham, Birmingham, United Kingdom
- Institute for Translational Medicine, University of Birmingham, Birmingham, United Kingdom
| | - Georgios V. Gkoutos
- Institute of Cancer and Genomic Sciences, Centre for Computational Biology, University of Birmingham, Birmingham, United Kingdom
- Institute for Translational Medicine, University of Birmingham, Birmingham, United Kingdom
- Health Data Research UK (HRD), Midlands Site, Birmingham, United Kingdom
| | - Stephen Wood
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
- Centre for Human Brain Health, University of Birmingham, Birmingham, United Kingdom
- Orygen, Melbourne, Australia
- Centre for Youth Mental Health, University of Melbourne, Melbourne, Australia
| | - Nicholas M. Barnes
- Institute for Clinical Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Anthony S. David
- Institute of Mental Health, University College London, London, United Kingdom
| | - Gary Donohoe
- School of Psychology, National University of Ireland Galway, Galway, Ireland
- Centre for Neuroimaging, Cognition and Genomics, National University of Ireland Galway, Galway, Ireland
| | - Joanna C. Neill
- Division of Pharmacy and Optometry, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Bill Deakin
- Division of Neuroscience and Experimental Psychology, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, United Kingdom
| | - Golam M. Khandaker
- Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom
- MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, United Kingdom
- Centre for Academic Mental Health, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, United Kingdom
- Avon and Wiltshire Mental Health Partnership NHS Trust, Bristol, United Kingdom
- NIHR Bristol Biomedical Research Centre, Bristol, United Kingdom
| | - Rachel Upthegrove
- Institute for Mental Health, University of Birmingham, Birmingham, United Kingdom
- Centre for Human Brain Health, University of Birmingham, Birmingham, United Kingdom
- Early Intervention Service, Birmingham Women’s and Children’s NHS Foundation Trust, Birmingham, United Kingdom
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Allweyer M, Emde M, Bähr I, Spielmann J, Bieramperl P, Naujoks W, Kielstein H. Investigation of Behavior and Plasma Levels of Corticosterone in Restrictive- and Ad Libitum-Fed Diet-Induced Obese Mice. Nutrients 2022; 14:nu14091746. [PMID: 35565711 PMCID: PMC9100467 DOI: 10.3390/nu14091746] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/15/2022] [Accepted: 04/19/2022] [Indexed: 02/04/2023] Open
Abstract
Diet-induced obesity (DIO) mice models are commonly used to investigate obesity-related health problems. Until now, only sparse data exist on the influence of DIO on behavior and stress hormones in mice. The present study investigates high-fat DIO with two different feeding regimes on behavioral parameters in mice. Various behavioral tests (open field, elevated plus maze, social interaction, hotplate) were performed with female BALB/c and male C57BL/6 mice after a feeding period of twelve weeks (restrictive vs. ad libitum and normal-fat diet vs. high-fat diet) to investigate levels of anxiety and aggression. BALB/c mice were DIO-resistant and therefore the prerequisite for the behavior analyses was not attained. C57BL/6 mice fed a high-fat diet had a significantly higher body weight and fat mass compared to C57BL/6 mice fed a control diet. Interestingly, the DIO C57BL/6 mice showed no changes in their aggression- or anxiety-related behavior but showed a significant change in the anxiety index. This was probably due to a lower activity level, as other ethological parameters did not show an altered anxiety-related behavior. In the ad libitum-fed DIO group, the highest corticosterone level was detected. Changes due to the feeding regime (restrictive vs. ad libitum) were not observed. These results provide a possible hint to a bias in the investigation of DIO-related health problems in laboratory animal experiments, which may be influenced by the lower activity level.
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Yeo XY, Cunliffe G, Ho RC, Lee SS, Jung S. Potentials of Neuropeptides as Therapeutic Agents for Neurological Diseases. Biomedicines 2022; 10:343. [PMID: 35203552 PMCID: PMC8961788 DOI: 10.3390/biomedicines10020343] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 01/23/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
Despite recent leaps in modern medicine, progress in the treatment of neurological diseases remains slow. The near impermeable blood-brain barrier (BBB) that prevents the entry of therapeutics into the brain, and the complexity of neurological processes, limits the specificity of potential therapeutics. Moreover, a lack of etiological understanding and the irreversible nature of neurological conditions have resulted in low tolerability and high failure rates towards existing small molecule-based treatments. Neuropeptides, which are small proteinaceous molecules produced by the body, either in the nervous system or the peripheral organs, modulate neurological function. Although peptide-based therapeutics originated from the treatment of metabolic diseases in the 1920s, the adoption and development of peptide drugs for neurological conditions are relatively recent. In this review, we examine the natural roles of neuropeptides in the modulation of neurological function and the development of neurological disorders. Furthermore, we highlight the potential of these proteinaceous molecules in filling gaps in current therapeutics.
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Affiliation(s)
- Xin Yi Yeo
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore 138667, Singapore; (X.Y.Y.); (G.C.)
- Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228, Singapore;
| | - Grace Cunliffe
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore 138667, Singapore; (X.Y.Y.); (G.C.)
- Division of Neuroscience and Experimental Psychology, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK
| | - Roger C. Ho
- Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119228, Singapore;
- Institute for Health Innovation & Technology (iHealthtech), National University of Singapore, Singapore 117599, Singapore
| | - Su Seong Lee
- NanoBio Lab, Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 138667, Singapore
| | - Sangyong Jung
- Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A*STAR), Singapore 138667, Singapore; (X.Y.Y.); (G.C.)
- Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117593, Singapore
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Nahvi RJ, Tanelian A, Nwokafor C, Hollander CM, Peacock L, Sabban EL. Intranasal Neuropeptide Y as a Potential Therapeutic for Depressive Behavior in the Rodent Single Prolonged Stress Model in Females. Front Behav Neurosci 2021; 15:705579. [PMID: 34566592 PMCID: PMC8456029 DOI: 10.3389/fnbeh.2021.705579] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Accepted: 07/19/2021] [Indexed: 01/14/2023] Open
Abstract
The susceptibility to stress-elicited disorders is markedly influenced by sex. Women are twice as likely as men to develop posttraumatic stress disorder (PTSD), depression, anxiety disorders, and social impairments following exposure to traumatic stress. However, most of the studies in animal models examining putative therapeutics for stress-triggered impairments, including single prolonged stress (SPS), were performed predominantly with males. Previous studies in males demonstrated that intranasal neuropeptide Y (NPY) can provide therapeutic relief of many SPS-triggered behaviors, but is ineffective in females at the same dose. Thus, females may need a higher dose of exogenous NPY to attain a therapeutically significant concentration since the overwhelming majority of studies found that NPY levels in females in many brain regions are lower than in male rodents. Here, we examined SPS as an appropriate model to elicit many PTSD-associated symptoms in females and whether intranasal NPY at higher doses than with males is able to alter the development of SPS-triggered behavioral impairments. Sprague-Dawley female rats were exposed to SPS only, or in a separate cohort after SPS stressors were immediately infused intranasally with one of several doses of NPY, starting with 600 μg/rat—four times the dose effective in males. In the third cohort of animals, females were infused intranasally with either 600 μg NPY, omarigliptin [a dipeptidyl peptidase IV (DPP4) inhibitor], or both right after the SPS stressors. After 19 days they were tested on several behavioral tests. SPS elicited significant depressive/despair like behavior on the forced swim test (FST), anxiety behavior on the elevated plus maze (EPM), as well as impaired social interaction. On the FST, there was a dose-response effect of intranasal NPY, with 1,200 μg, but not 600 μg, preventing the development of the SPS-elicited depressive-like behavior. The omarigliptin and 600 μg NPY combined treatment, but neither alone, was also sufficient at preventing depressive-like behavior on the FST. The results demonstrate that: (1) SPS elicits several behavioral manifestations of PTSD in females; (2) early intervention with a high dose of intranasal NPY has therapeutic potential also for females; and (3) NPY cleavage by DPP4 may play a role in the higher dose requirement for females.
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Affiliation(s)
- Roxanna J Nahvi
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Arax Tanelian
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Chiso Nwokafor
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Callie M Hollander
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Lauren Peacock
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
| | - Esther L Sabban
- Department of Biochemistry and Molecular Biology, New York Medical College, Valhalla, NY, United States
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11
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Short-term high-fat diet induces cognitive decline, aggression, and anxiety-like behavior in adult zebrafish. Prog Neuropsychopharmacol Biol Psychiatry 2021; 110:110288. [PMID: 33626334 DOI: 10.1016/j.pnpbp.2021.110288] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 02/04/2021] [Accepted: 02/16/2021] [Indexed: 12/22/2022]
Abstract
Obesity is a global health problem with high prevalence and defined by a high body mass index (BMI). Several comorbidities affecting the central nervous system (CNS) are associated with obesity (e.g., neurodegenerative diseases, cognitive deficit, and psychobehavioral disturbs). The zebrafish (Danio rerio) has been considered a suitable model organism to investigate the neurobehavioral features of various human diseases. Here, we verify the impact of a high-fat diet (HFD) on the CNS by specifically assessing the effects of short-term HFD on anxiety-like responses, aggression, social preference, and memory, which are essential behaviors for survival and reproduction. Animals were separated in three experimental groups. The standard diet group (SD) received 7.5 mg/fish of dry food, while HFD groups received 5 mg/fish dry food plus 7.5 (HFD-7.5) or 15 mg/fish (HFD-15) of chicken egg yolk daily. Dietary fat content (w/w) was approximately 6.5%, 16.9%, and 21.1%, respectively. We performed behavioral tests and morphometric analyses after two weeks of HFD. In comparison to SD animals, HFD groups showed typical obesogenic responses with increases in BMI, abdominal length, and body weight. HFD individuals also showed increased aggression and anxiety-like behaviors in the mirror-induced aggression and novel tank diving tests, respectively. Interestingly, HFD did not change the social preference behavior, mean swimming speed or spontaneous activity levels, while the HFD-15 group showed cognitive deficits in the inhibitory avoidance test. Collectively, this "proof-of-concept" study is the first report to characterize the effects of short-term HFD on different behavioral domains of zebrafish with high degree of face validity. Moreover, our data reinforce the growing utility of zebrafish to explore the neurobehavioral basis of obesity, providing clinically translatable data, complementing the existing rodent models and supporting future mechanistic studies.
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12
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GABAergic deficits in absence of LPA 1 receptor, associated anxiety-like and coping behaviors, and amelioration by interneuron precursor transplants into the dorsal hippocampus. Brain Struct Funct 2021; 226:1479-1495. [PMID: 33792787 DOI: 10.1007/s00429-021-02261-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Accepted: 03/17/2021] [Indexed: 02/05/2023]
Abstract
Defects in GABAergic function can cause anxiety- and depression-like behaviors among other neuropsychiatric disorders. Therapeutic strategies using the transplantation of GABAergic interneuron progenitors derived from the medial ganglionic eminence (MGE) into the adult hippocampus reversed the symptomatology in multiple rodent models of interneuron-related pathologies. In turn, the lysophosphatidic acid receptor LPA1 has been reported to be essential for hippocampal function. Converging evidence suggests that deficits in LPA1 receptor signaling represent a core feature underlying comparable hippocampal dysfunction and behaviors manifested in common neuropsychiatric conditions. Here, we first analyzed the GABAergic interneurons in the hippocampus of wild-type and maLPA1-null mice, lacking the LPA1 receptor. Our data revealed a reduction in the number of neurons expressing GABA, calcium-binding proteins, and neuropeptides such as somatostatin and neuropeptide Y in the hippocampus of maLPA1-null mice. Then, we used interneuron precursor transplants to test links between hippocampal GABAergic interneuron deficit, cell-based therapy, and LPA1 receptor-dependent psychiatric disease-like phenotypes. For this purpose, we transplanted MGE-derived interneuron precursors into the adult hippocampus of maLPA1-null mice, to test their effects on GABAergic deficit and behavioral symptoms associated with the absence of the LPA1 receptor. Transplant studies in maLPA1-null mice showed that grafted cells were able to restore the hippocampal host environment, decrease the anxiety-like behaviors and neutralize passive coping, with no abnormal effects on motor activity. Furthermore, grafted MGE-derived cells maintained their normal differentiation program. These findings reinforce the use of cell-based strategies for brain disorders and suggest that the LPA1 receptor represents a potential target for interneuron-related neuropsychiatric disorders.
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13
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Maroni MJ, Capri KM, Cushman AV, Deane HV, Concepcion H, DeCourcey H, Seggio JA. The timing of fasting leads to different levels of food consumption and PYY 3-36 in nocturnal mice. Hormones (Athens) 2020; 19:549-558. [PMID: 32572709 DOI: 10.1007/s42000-020-00221-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 06/09/2020] [Indexed: 12/21/2022]
Abstract
PURPOSE The daily circadian cycle is known to modulate both feeding behavior and metabolism. As such, the timing of food consumption can play a role in regulating overall health. The purpose of this study is to determine whether fasting at different times of the day alters subsequent food consumption and levels of PYY3-36, a hormone secreted after a meal which inhibits appetite. METHODS Separate groups of mice were fasted at different times of the day: (1) start of the day, (2) middle of the day, (3) start of the night, and (4) middle of the night, and either injected with vehicle or PYY3-36 to assess their subsequent food consumption patterns, PYY3-36 levels, and glucose and insulin levels. We also investigated whether light exposure during the night would alter food consumption and PYY3-36 levels after fasting. RESULTS Mice fasted during the start of the daytime exhibited increased food consumption post-fast compared to mice fasted during the night. Injections of PYY3-36 during the night were more effective in reducing food consumption compared to PYY3-36 administration during the day. Constant light exposure suppressed food consumption after fasting and increased fasting PYY3-36 levels. CONCLUSIONS These results indicate that mice exhibit distinct food consumption patterns after being presented with a fast at different times of the day. Light exposure also modulates both food consumption after a fast and levels of PYY3-36.
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Affiliation(s)
- Marissa J Maroni
- Department of Biological Sciences, Bridgewater State University, 24 Park Ave., Bridgewater State University, Bridgewater, MA, 02325, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Kimberly M Capri
- Department of Biological Sciences, Bridgewater State University, 24 Park Ave., Bridgewater State University, Bridgewater, MA, 02325, USA
- Boston University, Boston, MA, 02215, USA
| | - Alexis V Cushman
- Department of Biological Sciences, Bridgewater State University, 24 Park Ave., Bridgewater State University, Bridgewater, MA, 02325, USA
| | - Hannah V Deane
- Department of Biological Sciences, Bridgewater State University, 24 Park Ave., Bridgewater State University, Bridgewater, MA, 02325, USA
| | - Holly Concepcion
- Department of Biological Sciences, Bridgewater State University, 24 Park Ave., Bridgewater State University, Bridgewater, MA, 02325, USA
| | - Holly DeCourcey
- Department of Biological Sciences, Bridgewater State University, 24 Park Ave., Bridgewater State University, Bridgewater, MA, 02325, USA
| | - Joseph A Seggio
- Department of Biological Sciences, Bridgewater State University, 24 Park Ave., Bridgewater State University, Bridgewater, MA, 02325, USA.
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14
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Wee NKY, Nguyen AD, Enriquez RF, Zhang L, Herzog H, Baldock PA. Neuropeptide Y Regulation of Energy Partitioning and Bone Mass During Cold Exposure. Calcif Tissue Int 2020; 107:510-523. [PMID: 32804252 DOI: 10.1007/s00223-020-00745-9] [Citation(s) in RCA: 4] [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: 01/13/2020] [Accepted: 08/04/2020] [Indexed: 10/23/2022]
Abstract
The maintenance of whole body energy homeostasis is critical to survival and mechanisms exist whereby an organism can adapt to its environment and the stresses placed upon it. Environmental temperature and thermogenesis are key components known to affect energy balance. However, little is known about how these processes are balanced against the overall energy balance. We show that even mild cold exposure has a significant effect on energy expenditure and UCP-1 levels which increase by 43% and 400%, respectively, when wild-type (WT) mice at thermoneutral (29 °C) were compared to mice at room temperature (22 °C) conditions. Interestingly, bone mass was lower in cold-stressed WT mice with significant reductions in femoral bone mineral content (- 19%) and bone volume (- 13%). Importantly, these cold-induced skeletal changes were absent in mice lacking NPY, one of the main controllers of energy homeostasis, highlighting the critical role of NPY in this process. However, energy expenditure was significantly greater in cold-exposed NPY null mice, indicating that suppression of non-thermogenic tissues, like bone, contributes to the adaptive responses to cold exposure. Altogether, this work identifies NPY as being crucial in coordinating energy and bone homeostasis where it suppresses energy expenditure, UCP-1 levels and lowers bone mass under conditions of cold exposure.
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Affiliation(s)
- Natalie K Y Wee
- Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Amy D Nguyen
- Neuroscience Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Ronaldo F Enriquez
- Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Lei Zhang
- Neuroscience Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Herbert Herzog
- Neuroscience Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
- School of Medical Sciences, University of NSW, Sydney, NSW, Australia
| | - Paul A Baldock
- Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia.
- School of Medical Sciences, University of NSW, Sydney, NSW, Australia.
- School of Medicine Sydney, University of Notre Dame Australia, Sydney, Australia.
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15
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Sex differences in behavioral and metabolic effects of gene inactivation: The neuropeptide Y and Y receptors in the brain. Neurosci Biobehav Rev 2020; 119:333-347. [PMID: 33045245 DOI: 10.1016/j.neubiorev.2020.09.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Revised: 09/16/2020] [Accepted: 09/17/2020] [Indexed: 02/06/2023]
Abstract
Brain and gonadal hormones interplay controls metabolic and behavioral functions in a sex-related manner. However, most translational neuroscience research related to animal models of endocrine and psychiatric disorders are often carried out in male animals only. The Neuropeptide Y (NPY) system shows sex-dependent differences and is sensitive to gonadal steroids. Based on published data from our and other laboratories, in this review we will discuss the sex related differences of NPY action on energy balance, bone homeostasis and behavior in rodents with the genetic manipulation of genes encoding NPY and its Y1, Y2 and Y5 cognate receptors. Comparative analyses of the phenotype of transgenic and knockout NPY and Y receptor rodents unravels sex dependent differences in the functions of this neurotransmission system, potentially helping to develop therapeutics for a variety of sex-related disorders including metabolic syndrome, osteoporosis and ethanol addiction.
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16
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Nahvi RJ, Sabban EL. Sex Differences in the Neuropeptide Y System and Implications for Stress Related Disorders. Biomolecules 2020; 10:biom10091248. [PMID: 32867327 PMCID: PMC7564266 DOI: 10.3390/biom10091248] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 08/25/2020] [Accepted: 08/26/2020] [Indexed: 12/16/2022] Open
Abstract
The neuropeptide Y (NPY) system is emerging as a promising therapeutic target for neuropsychiatric disorders by intranasal delivery to the brain. However, the vast majority of underlying research has been performed with males despite females being twice as susceptible to many stress-triggered disorders such as posttraumatic stress disorder, depression, anorexia nervosa, and anxiety disorders. Here, we review sex differences in the NPY system in basal and stressed conditions and how it relates to varied susceptibility to stress-related disorders. The majority of studies demonstrate that NPY expression in many brain areas under basal, unstressed conditions is lower in females than in males. This could put them at a disadvantage in dealing with stress. Knock out animals and Flinders genetic models show that NPY is important for attenuating depression in both sexes, while its effects on anxiety appear more pronounced in males. In females, NPY expression after exposure to stress may depend on age, timing, and nature and duration of the stressors and may be especially pronounced in the catecholaminergic systems. Furthermore, alterations in NPY receptor expression and affinity may contribute to the sex differences in the NPY system. Overall, the review highlights the important role of NPY and sex differences in manifestation of neuropsychiatric disorders.
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17
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Autio J, Stenbäck V, Gagnon DD, Leppäluoto J, Herzig KH. (Neuro) Peptides, Physical Activity, and Cognition. J Clin Med 2020; 9:jcm9082592. [PMID: 32785144 PMCID: PMC7464334 DOI: 10.3390/jcm9082592] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/31/2020] [Accepted: 08/06/2020] [Indexed: 02/06/2023] Open
Abstract
Regular physical activity (PA) improves cognitive functions, prevents brain atrophy, and delays the onset of cognitive decline, dementia, and Alzheimer’s disease. Presently, there are no specific recommendations for PA producing positive effects on brain health and little is known on its mediators. PA affects production and release of several peptides secreted from peripheral and central tissues, targeting receptors located in the central nervous system (CNS). This review will provide a summary of the current knowledge on the association between PA and cognition with a focus on the role of (neuro)peptides. For the review we define peptides as molecules with less than 100 amino acids and exclude myokines. Tachykinins, somatostatin, and opioid peptides were excluded from this review since they were not affected by PA. There is evidence suggesting that PA increases peripheral insulin growth factor 1 (IGF-1) levels and elevated serum IGF-1 levels are associated with improved cognitive performance. It is therefore likely that IGF-1 plays a role in PA induced improvement of cognition. Other neuropeptides such as neuropeptide Y (NPY), ghrelin, galanin, and vasoactive intestinal peptide (VIP) could mediate the beneficial effects of PA on cognition, but the current literature regarding these (neuro)peptides is limited.
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Affiliation(s)
- Juho Autio
- Institute of Biomedicine, Medical Research Center, Faculty of Medicine, University of Oulu, Oulu University Hospital, 90220 Oulu, Finland; (J.A.); (V.S.); (D.D.G.); (J.L.)
| | - Ville Stenbäck
- Institute of Biomedicine, Medical Research Center, Faculty of Medicine, University of Oulu, Oulu University Hospital, 90220 Oulu, Finland; (J.A.); (V.S.); (D.D.G.); (J.L.)
- Biocenter Oulu, 90220 Oulu, Finland
| | - Dominique D. Gagnon
- Institute of Biomedicine, Medical Research Center, Faculty of Medicine, University of Oulu, Oulu University Hospital, 90220 Oulu, Finland; (J.A.); (V.S.); (D.D.G.); (J.L.)
- Laboratory of Environmental Exercise Physiology, School of Human Kinetics, Laurentian University, Sudbury, ON P3E 2C6, Canada
- Center of Research in Occupational Safety and Health, Laurentian University, Sudbury, ON P3E 2C6, Canada
| | - Juhani Leppäluoto
- Institute of Biomedicine, Medical Research Center, Faculty of Medicine, University of Oulu, Oulu University Hospital, 90220 Oulu, Finland; (J.A.); (V.S.); (D.D.G.); (J.L.)
| | - Karl-Heinz Herzig
- Institute of Biomedicine, Medical Research Center, Faculty of Medicine, University of Oulu, Oulu University Hospital, 90220 Oulu, Finland; (J.A.); (V.S.); (D.D.G.); (J.L.)
- Department of Gastroenterology and Metabolism, Poznan University of Medical Sciences, 60-572 Poznan, Poland
- Correspondence:
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18
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Kang X, Qian Z, Liu J, Feng D, Li H, Zhang Z, Jin X, Ma Z, Xu M, Li F, Zhang Y, Gao X, Sun H, Wu S. Neuropeptide Y Acts Directly on Cartilage Homeostasis and Exacerbates Progression of Osteoarthritis Through NPY2R. J Bone Miner Res 2020; 35:1375-1384. [PMID: 32101625 DOI: 10.1002/jbmr.3991] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Revised: 02/20/2020] [Accepted: 02/22/2020] [Indexed: 12/22/2022]
Abstract
Neuropeptide Y (NPY) is known to regulate bone homeostasis; however, its functional role as a risk factor during osteoarthritis (OA) remains elusive. In this study, we aim to investigate the direct effect of NPY on degradation of cartilage and progression of OA and explore the molecular events involved. NPY was overexpressed in human OA cartilage accompanied with increased expression of NPY1 receptor (NPY1R) and NPY2 receptor (NPY2R). Stressors such as cold exposure resulted in the peripheral release of NPY from sympathetic nerves, which in turn promoted upregulation of NPY and NPY2R in articular cartilage in vivo. Intra-articular administration of NPY significantly promoted chondrocyte hypertrophy and cartilage matrix degradation, with a higher OARSI score than that of control mice, whereas inhibition of NPY2R but not NPY1R with its specific antagonist remarkably ameliorated NPY-mediated effects. Moreover, NPY activated mTORC1 pathway in articular chondrocytes, whereas the administration of rapamycin (an mTORC1 inhibitor) in vitro abrogated NPY-mediated effects. Mechanistically, mTORC1 downstream kinase S6K1 interacted with and phosphorylated SMAD1/5/8 and promoted SMAD4 nuclear translocation, resulting in upregulation of Runx2 expression to promote chondrocyte hypertrophy and cartilage degradation. In conclusion, our findings provided the direct evidence and the crucial role of NPY in cartilage homeostasis. © 2020 American Society for Bone and Mineral Research.
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Affiliation(s)
- Xiaomin Kang
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, PR China
| | - Zhuang Qian
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, PR China
| | - Jiali Liu
- Department of Clinical Laboratory, the Second Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, PR China
| | - Dongxu Feng
- Hong Hui Hospital, Xi'an Jiaotong University School of Medicine, Xi'an, PR China
| | - Huixia Li
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, PR China
| | - Zhuanmin Zhang
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, PR China
| | - Xinxin Jin
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, PR China
| | - Zhengmin Ma
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, PR China
| | - Mao Xu
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, PR China
| | - Fang Li
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, PR China
| | - Ying Zhang
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, PR China
| | - Xin Gao
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, PR China
| | - Hongzhi Sun
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, PR China
| | - Shufang Wu
- Center for Translational Medicine, the First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an, PR China
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Corder KM, Li Q, Cortes MA, Bartley AF, Davis TR, Dobrunz LE. Overexpression of neuropeptide Y decreases responsiveness to neuropeptide Y. Neuropeptides 2020; 79:101979. [PMID: 31708112 PMCID: PMC6960342 DOI: 10.1016/j.npep.2019.101979] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 10/10/2019] [Accepted: 10/10/2019] [Indexed: 12/14/2022]
Abstract
Neuropeptide Y (NPY) is an endogenous neuropeptide that is abundantly expressed in the central nervous system. NPY is involved in various neurological processes and neuropsychiatric disorders, including fear learning and anxiety disorders. Reduced levels of NPY are reported in Post-Traumatic Stress Disorder (PTSD) patients, and NPY has been proposed as a potential therapeutic target for PTSD. It is therefore important to understand the effects of chronic enhancement of NPY on anxiety and fear learning. Previous studies have shown that acute elevation of NPY reduces anxiety, fear learning and locomotor activity. Models of chronic NPY overexpression have produced mixed results, possibly caused by ectopic NPY expression. NPY is expressed primarily by a subset of GABAergic interneurons, providing specific spatiotemporal release patterns. Administration of exogenous NPY throughout the brain, or overexpression in cells that do not normally release NPY, can have detrimental side effects, including memory impairment. In order to determine the effects of boosting NPY only in the cells that normally release it, we utilized a transgenic mouse line that overexpresses NPY only in NPY+ cells. We tested for effects on anxiety related behaviors in adolescent mice, an age with high incidence of anxiety disorders in humans. Surprisingly, we did not observe the expected reduction in anxiety-like behavior in NPY overexpression mice. There was no change in fear learning behavior, although there was a deficit in nest building. The effect of exogenous NPY on synaptic transmission in acute hippocampal slices was also diminished, indicating that the function of NPY receptors is impaired. Reduced NPY receptor function could contribute to the unexpected behavioral outcomes. We conclude that overexpression of NPY, even in cells that normally express it, can lead to reduced responsiveness of NPY receptors, potentially affecting the ability of NPY to function as a long-term therapeutic.
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Affiliation(s)
- Katelynn M Corder
- University of Alabama at Birmingham, Department of Neurobiology, 1825 University Blvd, SHEL 971, Birmingham, AL 35294, United States of America; University of Alabama at Birmingham, Department of Biology, 1670 University Blvd., VH G133B, Birmingham, AL 35233, United States of America
| | - Qin Li
- University of Alabama at Birmingham, Department of Neurobiology, 1825 University Blvd, SHEL 971, Birmingham, AL 35294, United States of America
| | - Mariana A Cortes
- University of Alabama at Birmingham, Department of Neurobiology, 1825 University Blvd, SHEL 971, Birmingham, AL 35294, United States of America
| | - Aundrea F Bartley
- University of Alabama at Birmingham, Department of Neurobiology, 1825 University Blvd, SHEL 971, Birmingham, AL 35294, United States of America
| | - Taylor R Davis
- University of Alabama at Birmingham, Department of Neurobiology, 1825 University Blvd, SHEL 971, Birmingham, AL 35294, United States of America
| | - Lynn E Dobrunz
- University of Alabama at Birmingham, Department of Neurobiology, 1825 University Blvd, SHEL 971, Birmingham, AL 35294, United States of America.
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20
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Xu L, Wang J. Food restriction in adolescence increases emotional disorder-like behaviors in adult rats. J Chem Neuroanat 2019; 104:101731. [PMID: 31862402 DOI: 10.1016/j.jchemneu.2019.101731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 12/14/2019] [Accepted: 12/15/2019] [Indexed: 10/25/2022]
Abstract
This study was designed to investigate the neuronal mechanism underlying the influence of early-life food restriction on the central nervous system and subsequent behaviors in adult rats. Several behavioral paradigms were tested in rats, including sucrose negative contrast test, forced swimming test (FST) and elevated plus maze test (EPM). in vivo intracellular electrophysiological recordings were conducted in the lateral nucleus of the amygdala (LAT). Finally, the levels of neuropeptide Y (NPY) were examined using immunohistochemistry. Food restriction during adolescence reduced sucrose preference in adult rats. Adolescent food restriction increased total immobile time in the FST and reduced the latency in rats to the first bout of immobility. In the EPM test, rats that experienced food restriction in adolescence and tested four weeks later spent less time than unrestricted controls in the open arm. In addition, chronic food restriction in adolescence increased in vivo LAT neuronal excitability in adulthood. Finally, NPY immunoreactivity in the LAT was reduced in rats that experienced chronic food restriction in adolescence compared to controls. Our results suggest that food restriction in adolescence increases emotional disorder-like behaviors in adult life, in which NPY production regulates the LAT-dependent behaviors and may underly the vulnerability to emotional disorders.
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Affiliation(s)
- Li Xu
- Department of Electrophysiological Examination, Cangzhou Central Hospital, Cangzhou 061001, Hebei Province, China
| | - Jinfeng Wang
- Department of Electrophysiological Examination, Cangzhou Central Hospital, Cangzhou 061001, Hebei Province, China.
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21
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Acton D, Ren X, Di Costanzo S, Dalet A, Bourane S, Bertocchi I, Eva C, Goulding M. Spinal Neuropeptide Y1 Receptor-Expressing Neurons Form an Essential Excitatory Pathway for Mechanical Itch. Cell Rep 2019; 28:625-639.e6. [PMID: 31315043 PMCID: PMC6709688 DOI: 10.1016/j.celrep.2019.06.033] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 05/20/2019] [Accepted: 06/06/2019] [Indexed: 01/08/2023] Open
Abstract
Acute itch can be generated by either chemical or mechanical stimuli, which activate separate pathways in the periphery and spinal cord. While substantial progress has been made in mapping the transmission pathway for chemical itch, the central pathway for mechanical itch remains obscure. Using complementary genetic and pharmacological manipulations, we show that excitatory neurons marked by the expression of the neuropeptide Y1 receptor (Y1Cre neurons) form an essential pathway in the dorsal spinal cord for the transmission of mechanical but not chemical itch. Ablating or silencing the Y1Cre neurons abrogates mechanical itch, while chemogenetic activation induces scratching. Moreover, using Y1 conditional knockout mice, we demonstrate that endogenous neuropeptide Y (NPY) acts via dorsal-horn Y1-expressing neurons to suppress light punctate touch and mechanical itch stimuli. NPY-Y1 signaling thus regulates the transmission of innocuous tactile information by establishing biologically relevant thresholds for touch discrimination and mechanical itch reflexes.
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Affiliation(s)
- David Acton
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Xiangyu Ren
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA; Biology Graduate Program, Division of Biological Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Stefania Di Costanzo
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA; Biology Graduate Program, Division of Biological Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
| | - Antoine Dalet
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Steeve Bourane
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
| | - Ilaria Bertocchi
- Department of Neuroscience, University of Torino, Neuroscience Institute of the Cavalieri-Ottolenghi Foundation, Regione Gonzole 1, 10043 Orbassano, Italy
| | - Carola Eva
- Department of Neuroscience, University of Torino, Neuroscience Institute of the Cavalieri-Ottolenghi Foundation, Regione Gonzole 1, 10043 Orbassano, Italy
| | - Martyn Goulding
- Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.
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Cannabidiol (CBD) reduces anxiety-related behavior in mice via an FMRP-independent mechanism. Pharmacol Biochem Behav 2019; 181:93-100. [DOI: 10.1016/j.pbb.2019.05.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 04/21/2019] [Accepted: 05/01/2019] [Indexed: 11/18/2022]
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23
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Lee NJ, Clarke IM, Zengin A, Enriquez RF, Nagy V, Penninger JM, Baldock PA, Herzog H. RANK deletion in neuropeptide Y neurones attenuates oestrogen deficiency-related bone loss. J Neuroendocrinol 2019; 31:e12687. [PMID: 30633834 DOI: 10.1111/jne.12687] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 01/06/2019] [Accepted: 01/07/2019] [Indexed: 12/17/2022]
Abstract
The RANKL pathway is known to be an important aspect of the pathogenesis of oestrogen deficiency-induced bone loss. RANK deletion specifically in neuropeptide Y (NPY) neurones has been shown to enhance the ability of the skeleton to match increases in body weight caused by high-fat diet feeding, likely via the modulation of NPY levels. In the present study, we used ovariectomy in female mice to show that RANK deletion in NPY neurones attenuates bone loss caused by long-term oestrogen deficiency, particularly in the vertebral compartment. Ovariectomy led to a reduction in NPY expression levels in the arcuate nucleus of NPYcre/+ ;RANKlox/lox mice compared to NPYcre/+ ;RANKlox/+ controls. Because NPY deficient mice also displayed a similar protection against ovariectomy-induced bone loss, modulation of hypothalamic NPY signalling is the likely mechanism behind the protection from bone loss in the NPYcre/+ ;RANKlox/lox mice.
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Affiliation(s)
- Nicola J Lee
- Neuroscience Division, Garvan Institute, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- St Vincents Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
| | - Ireni M Clarke
- Neuroscience Division, Garvan Institute, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Ayse Zengin
- Bone Biology Division, Garvan Institute, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Ronaldo F Enriquez
- Neuroscience Division, Garvan Institute, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- Bone Biology Division, Garvan Institute, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Vanj Nagy
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna, Austria
- Ludwig Boltzmann Institute for Rare and Undiagnosed Diseases, Vienna, Austria
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
| | - Josef M Penninger
- Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna, Austria
| | - Paul A Baldock
- St Vincents Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
- Bone Biology Division, Garvan Institute, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Herbert Herzog
- Neuroscience Division, Garvan Institute, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
- St Vincents Clinical School, UNSW Sydney, Sydney, New South Wales, Australia
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24
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Long-term behavioural effects of maternal obesity in C57BL/6J mice. Physiol Behav 2019; 199:306-313. [DOI: 10.1016/j.physbeh.2018.11.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 11/04/2018] [Accepted: 11/04/2018] [Indexed: 12/22/2022]
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25
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Wee NKY, Sinder BP, Novak S, Wang X, Stoddard C, Matthews BG, Kalajzic I. Skeletal phenotype of the neuropeptide Y knockout mouse. Neuropeptides 2019; 73:78-88. [PMID: 30522780 PMCID: PMC6326877 DOI: 10.1016/j.npep.2018.11.009] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 11/04/2018] [Accepted: 11/28/2018] [Indexed: 10/27/2022]
Abstract
Neuropeptide Y (NPY) is involved in multiple processes such as behavior, energy and bone metabolism. Previous studies have relied on global NPY depletion to examine its effects on bone. However, this approach is unable to distinguish the central or local source of NPY influencing bone. Our aim was to identify which cells within the skeleton express Npy and establish a model that will enable us to differentiate effects of NPY derived from different cell types. We have generated the NPY floxed (NPYflox) mice using CRISPR technology. By crossing the NPYflox mice with Hypoxanthine Phosphoribosyltransferase 1 (Hprt)-cre to generate a global knockout, we were able to validate and confirm loss of Npy transcript and protein in our global NPYKO. Global deletion of NPY results in a smaller femoral cortical cross-sectional area (-12%) and reduced bone strength (-18%) in male mice. In vitro, NPY-deficient bone marrow stromal cells (BMSCs) showed increase in osteogenic differentiation detected by increases in alkaline phosphatase staining and bone sialoprotein and osteocalcin expression. Despite both sexes presenting with increased adiposity, female mice had no alterations in bone mass, suggesting that NPY may have sex-specific effects on bone. In this study we identified Npy expression in the skeleton and examined the effect of global NPY depletion to bone mass. The differential impact of NPY deletion in cortical and cancellous compartments along with differences in phenotypes between in vitro and in vivo, highlights the complex nature of NPY signaling, indicative of distinct sources that can be dissected in the future using this NPYflox model.
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Affiliation(s)
- Natalie K Y Wee
- Department of Reconstructive Sciences, Farmington, CT 06030, USA
| | | | - Sanja Novak
- Department of Reconstructive Sciences, Farmington, CT 06030, USA
| | - Xi Wang
- Department of Reconstructive Sciences, Farmington, CT 06030, USA
| | - Chris Stoddard
- Genetics and Genome Sciences, UConn Health, Farmington, CT 06030, USA
| | - Brya G Matthews
- Department of Reconstructive Sciences, Farmington, CT 06030, USA; Department of Molecular Medicine and Pathology, University of Auckland, Auckland 1023, New Zealand
| | - Ivo Kalajzic
- Department of Reconstructive Sciences, Farmington, CT 06030, USA.
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Diet-induced adaptive thermogenesis requires neuropeptide FF receptor-2 signalling. Nat Commun 2018; 9:4722. [PMID: 30413707 PMCID: PMC6226433 DOI: 10.1038/s41467-018-06462-0] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 09/07/2018] [Indexed: 11/24/2022] Open
Abstract
Excess caloric intake results in increased fat accumulation and an increase in energy expenditure via diet-induced adaptive thermogenesis; however, the underlying mechanisms controlling these processes are unclear. Here we identify the neuropeptide FF receptor-2 (NPFFR2) as a critical regulator of diet-induced thermogenesis and bone homoeostasis. Npffr2−/− mice exhibit a stronger bone phenotype and when fed a HFD display exacerbated obesity associated with a failure in activating brown adipose tissue (BAT) thermogenic response to energy excess, whereas the activation of cold-induced BAT thermogenesis is unaffected. NPFFR2 signalling is required to maintain basal arcuate nucleus NPY mRNA expression. Lack of NPFFR2 signalling leads to a decrease in BAT thermogenesis under HFD conditions with significantly lower UCP-1 and PGC-1α levels in the BAT. Together, these data demonstrate that NPFFR2 signalling promotes diet-induced thermogenesis via a novel hypothalamic NPY-dependent circuitry thereby coupling energy homoeostasis with energy partitioning to adipose and bone tissue. Excess caloric intake leads to increased thermogenesis in brown adipose tissue, to limit weight gain. Here, the authors show that neuropeptide FF receptor-2 signalling promotes thermogenesis via control of NPY expression in the arcuate nucleus, and that it absence in mice leads to a failure of activation of diet-induced thermogenesis and the development of exacerbated obesity.
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Miragaia AS, de Oliveira Wertheimer GS, Consoli AC, Cabbia R, Longo BM, Girardi CEN, Suchecki D. Maternal Deprivation Increases Anxiety- and Depressive-Like Behaviors in an Age-Dependent Fashion and Reduces Neuropeptide Y Expression in the Amygdala and Hippocampus of Male and Female Young Adult Rats. Front Behav Neurosci 2018; 12:159. [PMID: 30131681 PMCID: PMC6090069 DOI: 10.3389/fnbeh.2018.00159] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Accepted: 07/09/2018] [Indexed: 01/28/2023] Open
Abstract
Maternal deprivation for 24 h produces an immediate increase in basal and stress-induced corticosterone (CORT) secretion. Given the impact of elevated CORT levels on brain development, the goal of the present study was to characterize the effects of maternal deprivation at postnatal days 3 (DEP3) or 11 (DEP11) on emotional behavior and neuropeptide Y immunoreactivity (NPY-ir) in the basolateral amygdala (BLA) and dorsal hippocampus (dHPC) of male and female rats. Litters were distributed in control non-deprived (CTL), DEP3, or DEP11 groups. In Experiment 1, within each litter, one male and one female were submitted to one of the following tests: novelty suppressed feeding (NSF), sucrose negative contrast test (SNCT), and forced swimming test (FST), between postnatal days 52 and 60. In Experiment 2, two males and two females per litter were exposed to the elevated plus maze and 1 h later, perfused for investigation of NPY-ir, on PND 52. The results showed that DEP3 rats displayed greater anxiety-like behavior in the NSF and EPM, compared to CTL and DEP11 counterparts. In the SNCT, DEP3 and DEP11 males showed less suppression of the lower sucrose concentration intake, whereas all females suppressed less than males. Both manipulated groups displayed more immobility in the FST, although this effect was greater in DEP3 than in DEP11 rats. NPY-ir was reduced in DEP3 and DEP11 males and females in the BLA, whereas in the dHPC, DEP3 males showed less NPY-ir than DEP11, which, in turn, presented less NPY-ir than CTL rats. Females showed less NPY-ir than males in both structures. Because the deprivation effects were more intense in DEP3 than in DEP11, in Experiment 3, the frequency of nursing posture, licking-grooming, and interaction with pups was assessed upon litter reunion with mothers. Mothers of DEP11 litters engaged more in anogenital licking than mothers of DEP3 litters. The present results indicate that maternal deprivation changed affective behavior with greater impact in the earlier age and reduced the expression of NPY in emotion-related brain areas. The age-dependent differential effects of deprivation on maternal behavior could, at least in part, explain the outcomes in young adult rats.
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Affiliation(s)
- Alexandra S Miragaia
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil.,Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, United States
| | | | - Amanda C Consoli
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Rafael Cabbia
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Beatriz M Longo
- Departamento de Fisiologia, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Carlos E N Girardi
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil
| | - Deborah Suchecki
- Departamento de Psicobiologia, Universidade Federal de São Paulo, São Paulo, Brazil
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Prefrontal cortex-dependent innate behaviors are altered by selective knockdown of Gad1 in neuropeptide Y interneurons. PLoS One 2018; 13:e0200809. [PMID: 30024942 PMCID: PMC6053188 DOI: 10.1371/journal.pone.0200809] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 06/09/2018] [Indexed: 12/23/2022] Open
Abstract
GABAergic dysfunction has been implicated in a variety of neurological and psychiatric disorders, including anxiety disorders. Anxiety disorders are the most common type of psychiatric disorder during adolescence. There is a deficiency of GABAergic transmission in anxiety, and enhancement of GABA transmission through pharmacological means reduces anxiety behaviors. GAD67—the enzyme responsible for GABA production–has been linked to anxiety disorders. One class of GABAergic interneurons, Neuropeptide Y (NPY) expressing cells, is abundantly found in brain regions associated with anxiety and fear learning, including prefrontal cortex, hippocampus and amygdala. Additionally, NPY itself has been shown to have anxiolytic effects, and loss of NPY+ interneurons enhances anxiety behaviors. A previous study showed that knockdown of Gad1 from NPY+ cells led to reduced anxiety behaviors in adult mice. However, the role of GABA release from NPY+ interneurons in adolescent anxiety is unclear. Here we used a transgenic mouse that reduces GAD67 in NPY+ cells (NPYGAD1-TG) through Gad1 knockdown and tested for effects on behavior in adolescent mice. Adolescent NPYGAD1-TG mice showed enhanced anxiety-like behavior and sex-dependent changes in locomotor activity. We also found enhancement in two other innate behavioral tasks, nesting construction and social dominance. In contrast, fear learning was unchanged. Because we saw changes in behavioral tasks dependent upon prefrontal cortex and hippocampus, we investigated the extent of GAD67 knockdown in these regions. Immunohistochemistry revealed a 40% decrease in GAD67 in NPY+ cells in prefrontal cortex, indicating a significant but incomplete knockdown of GAD67. In contrast, there was no decrease in GAD67 in NPY+ cells in hippocampus. Consistent with this, there was no change in inhibitory synaptic transmission in hippocampus. Our results show the behavioral impact of cell-specific interneuron dysfunction and suggest that GABA release by NPY+ cells is important for regulating innate prefrontal cortex-dependent behavior in adolescents.
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29
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Lee NJ, Ali N, Zhang L, Qi Y, Clarke I, Enriquez RF, Brzozowska M, Lee IC, Rogers MJ, Laybutt DR, Center JR, Baldock PA, Herzog H. Osteoglycin, a novel coordinator of bone and glucose homeostasis. Mol Metab 2018; 13:30-44. [PMID: 29799418 PMCID: PMC6026319 DOI: 10.1016/j.molmet.2018.05.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 05/02/2018] [Accepted: 05/04/2018] [Indexed: 01/09/2023] Open
Abstract
Objective The skeleton, which is strongly controlled by endocrine factors, has recently been shown to also play an active endocrine role itself, specifically influencing energy metabolism. However, much less is known about this role. Therefore, we sought to identify novel endocrine factors involved in the regulation of both bone mass and whole-body glucose homeostasis. Methods We used transcriptomic and proteomic analysis of Y1 receptor deficient osteoblasts combined with the generation of a novel osteoglycin deficient mouse model and performed comprehensive in vivo phenotype profiling, combined with osteoglycin administration in wildtype mice and human studies. Results Here we identify a novel role for osteoglycin, a secreted proteoglycan, in coordinating bone accretion with changes in energy balance. Using an osteoglycin knockout mouse model, we show that at a whole body level, osteoglycin acts to suppress bone formation and modulate whole body energy supplies by altering glucose uptake through changes in insulin secretion and sensitivity, as well as by altering food intake through central signaling. Examining humans following gastric surgery as a model of negative energy balance, we show that osteoglycin is associated with BMI and lean mass as well as changes in weight, BMI, and glucose levels. Conclusions Thus, we identify osteoglycin as a novel factor involved in the regulation of energy homeostasis and identify a role for it in facilitating the matching of bone acquisition to alterations in energy status. Osteoglycin regulates insulin action, bone mass and food intake in mice. Osteoglycin is associated with changes in weight, BMI and glucose in obese humans. Osteoglycin is a downstream mediator of NPY signaling via osteoblastic Y1 receptors.
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Affiliation(s)
- N J Lee
- Neuroscience Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; St Vincents Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - N Ali
- Bone Biology Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | - L Zhang
- Neuroscience Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; St Vincents Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - Y Qi
- Neuroscience Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | - I Clarke
- Neuroscience Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | - R F Enriquez
- Neuroscience Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; Bone Biology Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | - M Brzozowska
- Bone Biology Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; St Vincents Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - I C Lee
- Neuroscience Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | - M J Rogers
- Bone Biology Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; St Vincents Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - D R Laybutt
- Diabetes and Metabolism Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | - J R Center
- Bone Biology Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; St Vincents Clinical School, UNSW Sydney, Sydney, NSW, Australia
| | - P A Baldock
- Bone Biology Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; St Vincents Clinical School, UNSW Sydney, Sydney, NSW, Australia; Faculty of Medicine, UNSW Sydney, Sydney, NSW, Australia
| | - H Herzog
- Neuroscience Division, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; St Vincents Clinical School, UNSW Sydney, Sydney, NSW, Australia; Faculty of Medicine, UNSW Sydney, Sydney, NSW, Australia.
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30
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Wee NKY, Enriquez RF, Nguyen AD, Horsnell H, Kulkarni R, Khor EC, Herzog H, Baldock PA. Diet-induced obesity suppresses cortical bone accrual by a neuropeptide Y-dependent mechanism. Int J Obes (Lond) 2018. [PMID: 29523877 DOI: 10.1038/s41366-018-0028-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
OBJECTIVE To determine whether age and neuropeptide Y (NPY) were involved in the skeletal response to extended periods of diet-induced obesity. METHODS Male wild-type (WT) and NPY null (NPYKO) mice were fed a mild (23% fat) high-fat diet for 10 weeks from 6 or 16 weeks of age. Metabolism and bone density were assessed during feeding. Skeletal changes were assessed by microCT and histomorphometry. RESULTS High-fat feeding in 6-week-old WT mice led to significantly increased body weight, adiposity and serum leptin levels, accompanied with markedly suppressed cortical bone accrual. NPYKO mice were less susceptible to fat accrual but, importantly, displayed a complete lack of suppression of bone accrual or cortical bone loss. In contrast, when skeletally mature (16 week old) mice underwent 10 weeks of fat feeding, the metabolic response to HFD was similar to younger mice, however bone mass was not affected in either WT or NPYKO. Thus, growing mice are particularly susceptible to the detrimental effects of HFD on bone mass, through suppression of bone accrual involving NPY signalling. CONCLUSION This study provides new insights into the relationship between the opposing processes of a positive weight/bone relationship and the negative 'metabolic' effect of obesity on bone mass. This negative effect is particularly active in growing skeletons, which have heightened sensitivity to changes in obesity. In addition, NPY is identified as a fundamental driver of this negative 'metabolic' pathway to bone.
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Affiliation(s)
- Natalie K Y Wee
- Osteoporosis and Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Ronaldo F Enriquez
- Osteoporosis and Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Amy D Nguyen
- Neuroscience Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Harry Horsnell
- Osteoporosis and Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Rishikesh Kulkarni
- Osteoporosis and Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Ee Cheng Khor
- Osteoporosis and Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Herbert Herzog
- Neuroscience Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia
| | - Paul A Baldock
- Osteoporosis and Bone Biology Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW, 2010, Australia.
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31
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Lei M, Shafique A, Shang K, Couttas TA, Zhao H, Don AS, Karl T. Contextual fear conditioning is enhanced in mice lacking functional sphingosine kinase 2. Behav Brain Res 2017. [DOI: 10.1016/j.bbr.2017.06.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kornhuber J, Zoicas I. Neuropeptide Y prolongs non-social memory and differentially affects acquisition, consolidation, and retrieval of non-social and social memory in male mice. Sci Rep 2017; 7:6821. [PMID: 28754895 PMCID: PMC5533709 DOI: 10.1038/s41598-017-07273-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Accepted: 06/23/2017] [Indexed: 01/08/2023] Open
Abstract
Neuropeptide Y (NPY) and its receptors (especially Y1, Y2, and Y5) are highly expressed in brain regions involved in learning and memory processes. Accordingly, NPY was shown to modulate cognitive functions in rodents. Here, we investigated possible memory-enhancing effects of NPY and determined the role of the NPY system in the acquisition, consolidation, and retrieval of non-social and social memory in mice, using the object and social discrimination tests, respectively. Intracerebroventricular (icv) infusion of NPY (1 nmol/2 µl) prolonged retention of non-social (object) memory, but not of social memory. This effect was blocked by the Y1 receptor antagonist BIBO3304 trifluoroacetate (2 nmol/2 µl), but not by the Y2 receptor antagonist BIIE0246 (2 nmol/2 µl). While icv infusion of NPY did not affect the acquisition, consolidation, and retrieval of non-social and social memory, icv infusion of BIBO3304 trifluoroacetate and BIIE0246 blocked the consolidation of non-social memory and the retrieval of both non-social and social memory. This study suggests that NPY has memory-enhancing effects in a non-social context by specifically acting on Y1 receptors. It further suggests that the central NPY system exerts differential effects on the sequential phases of non-social and social memory.
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Affiliation(s)
- Johannes Kornhuber
- Department of Psychiatry and Psychotherapy, University Hospital, Friedrich-Alexander-University Erlangen-Nuremberg, 91054, Erlangen, Germany
| | - Iulia Zoicas
- Department of Psychiatry and Psychotherapy, University Hospital, Friedrich-Alexander-University Erlangen-Nuremberg, 91054, Erlangen, Germany.
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Perez-Rando M, Castillo-Gómez E, Guirado R, Blasco-Ibañez JM, Crespo C, Varea E, Nacher J. NMDA Receptors Regulate the Structural Plasticity of Spines and Axonal Boutons in Hippocampal Interneurons. Front Cell Neurosci 2017; 11:166. [PMID: 28659763 PMCID: PMC5466979 DOI: 10.3389/fncel.2017.00166] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 05/29/2017] [Indexed: 11/13/2022] Open
Abstract
N-methyl-D-aspartate receptors (NMDARs) are present in both pyramidal neurons and interneurons of the hippocampus. These receptors play an important role in the adult structural plasticity of excitatory neurons, but their impact on the remodeling of interneurons is unknown. Among hippocampal interneurons, somatostatin-expressing cells located in the stratum oriens are of special interest because of their functional importance and structural characteristics: they display dendritic spines, which change density in response to different stimuli. In order to understand the role of NMDARs on the structural plasticity of these interneurons, we have injected acutely MK-801, an NMDAR antagonist, to adult mice which constitutively express enhanced green fluorescent protein (EGFP) in these cells. We have behaviorally tested the animals, confirming effects of the drug on locomotion and anxiety-related behaviors. NMDARs were expressed in the somata and dendritic spines of somatostatin-expressing interneurons. Twenty-four hours after the injection, the density of spines did not vary, but we found a significant increase in the density of their en passant boutons (EPB). We have also used entorhino-hippocampal organotypic cultures to study these interneurons in real-time. There was a rapid decrease in the apparition rate of spines after MK-801 administration, which persisted for 24 h and returned to basal levels afterwards. A similar reversible decrease was detected in spine density. Our results show that both spines and axons of interneurons can undergo remodeling and highlight NMDARs as regulators of this plasticity. These results are specially relevant given the importance of all these players on hippocampal physiology and the etiopathology of certain psychiatric disorders.
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Affiliation(s)
- Marta Perez-Rando
- Neurobiology Unit, Department of Cell Biology, Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de ValènciaValència, Spain
| | - Esther Castillo-Gómez
- Neurobiology Unit, Department of Cell Biology, Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de ValènciaValència, Spain
| | - Ramon Guirado
- Neurobiology Unit, Department of Cell Biology, Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de ValènciaValència, Spain
| | - José Miguel Blasco-Ibañez
- Neurobiology Unit, Department of Cell Biology, Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de ValènciaValència, Spain
| | - Carlos Crespo
- Neurobiology Unit, Department of Cell Biology, Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de ValènciaValència, Spain
| | - Emilio Varea
- Neurobiology Unit, Department of Cell Biology, Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de ValènciaValència, Spain
| | - Juan Nacher
- Neurobiology Unit, Department of Cell Biology, Interdisciplinary Research Structure for Biotechnology and Biomedicine (BIOTECMED), Universitat de ValènciaValència, Spain.,CIBERSAM: Spanish National Network for Research in Mental HealthMadrid, Spain.,Fundación Investigación Hospital Clínico de Valencia, Instituto de Investigación Sanitaria (INCLIVA)València, Spain
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Thangaratnarajah C, Dinger K, Vohlen C, Klaudt C, Nawabi J, Lopez Garcia E, Kwapiszewska G, Dobner J, Nüsken KD, van Koningsbruggen-Rietschel S, von Hörsten S, Dötsch J, Alejandre Alcázar MA. Novel role of NPY in neuroimmune interaction and lung growth after intrauterine growth restriction. Am J Physiol Lung Cell Mol Physiol 2017; 313:L491-L506. [PMID: 28572154 DOI: 10.1152/ajplung.00432.2016] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 05/02/2017] [Accepted: 05/26/2017] [Indexed: 01/21/2023] Open
Abstract
Individuals with intrauterine growth restriction (IUGR) are at risk for chronic lung disease. Using a rat model, we showed in our previous studies that altered lung structure is related to IL-6/STAT3 signaling. As neuropeptide Y (NPY), a coneurotransmitter of the sympathetic nervous system, regulates proliferation and immune response, we hypothesized that dysregulated NPY after IUGR is linked to IL-6, impaired myofibroblast function, and alveolar growth. IUGR was induced in rats by isocaloric low-protein diet; lungs were analyzed on embryonic day (E) 21, postnatal day (P) 3, P12, and P23. Finally, primary neonatal lung myofibroblasts (pnF) and murine embryonic fibroblasts (MEF) were used to assess proliferation, apoptosis, migration, and IL-6 expression. At E21, NPY and IL-6 expression was decreased, and AKT/PKC and STAT3/AMPKα signaling was reduced. Early reduction of NPY/IL-6 was associated with increased chord length in lungs after IUGR at P3, indicating reduced alveolar formation. At P23, however, IUGR rats exhibited a catch-up of body weight and alveolar growth coupled with more proliferating myofibroblasts. These structural findings after IUGR were linked to activated NPY/PKC, IL-6/AMPKα signaling. Complementary, IUGR-pnF showed increased survival, impaired migration, and reduced IL-6 compared with control-pnF (Co-pnF). In contrast, NPY induced proliferation, migration, and increased IL-6 synthesis in fibroblasts. Additionally, NPY-/- mice showed reduced IL-6 signaling and less proliferation of lung fibroblasts. Our study presents a novel role of NPY during alveolarization: NPY regulates 1) IL-6 and lung STAT3/AMPKα signaling, and 2) proliferation and migration of myofibroblasts. These new insights in pulmonary neuroimmune interaction offer potential strategies to enable lung growth.
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Affiliation(s)
- Chansutha Thangaratnarajah
- Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | - Katharina Dinger
- Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | - Christina Vohlen
- Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany.,University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | - Christian Klaudt
- Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | - Jawed Nawabi
- Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | - Eva Lopez Garcia
- Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | | | - Julia Dobner
- Experimental Therapy, Preclinical Centre, University Hospital Erlangen, Erlangen, Germany
| | - Kai D Nüsken
- University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | - Silke van Koningsbruggen-Rietschel
- Pediatric Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany; and
| | - Stephan von Hörsten
- Experimental Therapy, Preclinical Centre, University Hospital Erlangen, Erlangen, Germany
| | - Jörg Dötsch
- University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
| | - Miguel A Alejandre Alcázar
- Translational Experimental Pediatrics, Experimental Pulmonology, University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany; .,University Hospital for Pediatrics and Adolescent Medicine, Faculty of Medicine, University of Cologne, Cologne, Germany
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35
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Early Social Isolation Stress and Perinatal NMDA Receptor Antagonist Treatment Induce Changes in the Structure and Neurochemistry of Inhibitory Neurons of the Adult Amygdala and Prefrontal Cortex. eNeuro 2017; 4:eN-NWR-0034-17. [PMID: 28466069 PMCID: PMC5411163 DOI: 10.1523/eneuro.0034-17.2017] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2017] [Revised: 03/01/2017] [Accepted: 03/02/2017] [Indexed: 12/26/2022] Open
Abstract
The exposure to aversive experiences during early life influences brain development and leads to altered behavior. Moreover, the combination of these experiences with subtle alterations in neurodevelopment may contribute to the emergence of psychiatric disorders, such as schizophrenia. Recent hypotheses suggest that imbalances between excitatory and inhibitory (E/I) neurotransmission, especially in the prefrontal cortex and the amygdala, may underlie their etiopathology. In order to understand better the neurobiological bases of these alterations, we studied the impact of altered neurodevelopment and chronic early-life stress on these two brain regions. Transgenic mice displaying fluorescent excitatory and inhibitory neurons, received a single injection of MK801 (NMDAR antagonist) or vehicle solution at postnatal day 7 and/or were socially isolated from the age of weaning until adulthood (3 months old). We found that anxiety-related behavior, brain volume, neuronal structure, and the expression of molecules related to plasticity and E/I neurotransmission in adult mice were importantly affected by early-life stress. Interestingly, many of these effects were potentiated when the stress paradigm was applied to mice perinatally injected with MK801 ("double-hit" model). These results clearly show the impact of early-life stress on the adult brain, especially on the structure and plasticity of inhibitory networks, and highlight the double-hit model as a valuable tool to study the contribution of early-life stress in the emergence of neurodevelopmental psychiatric disorders, such as schizophrenia.
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Low JK, Ambikairajah A, Shang K, Brown DA, Tsai VWW, Breit SN, Karl T. First Behavioural Characterisation of a Knockout Mouse Model for the Transforming Growth Factor (TGF)-β Superfamily Cytokine, MIC-1/GDF15. PLoS One 2017; 12:e0168416. [PMID: 28081177 PMCID: PMC5231335 DOI: 10.1371/journal.pone.0168416] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 11/30/2016] [Indexed: 11/28/2022] Open
Abstract
Macrophage inhibitory cytokine-1 (MIC-1), also known as growth differentiation factor 15 (GDF15), is a stress response cytokine. MIC-1/GDF15 is secreted into the cerebrospinal fluid and increased levels of MIC-1/GDF15 are associated with a variety of diseases including cognitive decline. Furthermore, Mic-1/Gdf15 knockout mice (Mic-1 KO) weigh more, have increased adiposity, associated with increased spontaneous food intake, and exhibit reduced basal energy expenditure and physical activity. The current study was designed to comprehensively determine the role of MIC-1/GDF15 on behavioural domains of male and female knockout mice including locomotion, exploration, anxiety, cognition, social behaviours, and sensorimotor gating. Mic-1 KO mice exhibited a task-dependent increase in locomotion and exploration and reduced anxiety-related behaviours across tests. Spatial working memory and social behaviours were not affected by Mic-1/Gdf15 deficiency. Interestingly, knockout mice formed an increased association with the conditioned stimulus in fear conditioning testing and also displayed significantly improved prepulse inhibition. Overall sex effects were evident for social behaviours, fear conditioning, and sensorimotor gating. This is the first study defining the role of Mic-1/Gdf15 in a number of behavioural domains. Whether the observed impact is based on direct actions of Mic-1/Gdf15 deficiency on the CNS or whether the behavioural effects are mediated by indirect actions on e.g. other neurotransmitter systems must be clarified in future studies.
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Affiliation(s)
- Jac Kee Low
- Neuroscience Research Australia (NeuRA), Randwick, New South Wales, Australia
| | | | - Kani Shang
- School of Medicine, Western Sydney University, Campbelltown, New South Wales, Australia
| | - David A. Brown
- St Vincent’s Centre for Applied Medical Research, St Vincent’s Hospital, Darlinghurst, New South Wales, Australia
- Westmead Institute for Medical Research, The Institute for Clinical Pathology and Medical Research and Westmead Hospital, Westmead, New South Wales, Australia
| | - Vicky W. W. Tsai
- St Vincent’s Centre for Applied Medical Research, St Vincent’s Hospital, Darlinghurst, New South Wales, Australia
| | - Samuel N. Breit
- St Vincent’s Centre for Applied Medical Research, St Vincent’s Hospital, Darlinghurst, New South Wales, Australia
| | - Tim Karl
- Neuroscience Research Australia (NeuRA), Randwick, New South Wales, Australia
- School of Medicine, Western Sydney University, Campbelltown, New South Wales, Australia
- * E-mail:
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Reichmann F, Wegerer V, Jain P, Mayerhofer R, Hassan AM, Fröhlich EE, Bock E, Pritz E, Herzog H, Holzer P, Leitinger G. Environmental enrichment induces behavioural disturbances in neuropeptide Y knockout mice. Sci Rep 2016; 6:28182. [PMID: 27305846 PMCID: PMC4910086 DOI: 10.1038/srep28182] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 05/31/2016] [Indexed: 12/28/2022] Open
Abstract
Environmental enrichment (EE) refers to the provision of a complex and stimulating housing condition which improves well-being, behaviour and brain function of laboratory animals. The mechanisms behind these beneficial effects of EE are only partially understood. In the current report, we describe a link between EE and neuropeptide Y (NPY), based on findings from NPY knockout (KO) mice exposed to EE. Relative to EE-housed wildtype (WT) animals, NPY KO mice displayed altered behaviour as well as molecular and morphological changes in amygdala and hippocampus. Exposure of WT mice to EE reduced anxiety and decreased central glucocorticoid receptor expression, effects which were absent in NPY KO mice. In addition, NPY deletion altered the preference of EE items, and EE-housed NPY KO mice responded to stress with exaggerated hyperthermia, displayed impaired spatial memory, had higher hippocampal brain-derived neurotrophic factor mRNA levels and altered hippocampal synaptic plasticity, effects which were not seen in WT mice. Accordingly, these findings suggest that NPY contributes to the anxiolytic effect of EE and that NPY deletion reverses the beneficial effects of EE into a negative experience. The NPY system could thus be a target for “enviromimetics”, therapeutics which reproduce the beneficial effects of enhanced environmental stimulation.
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Affiliation(s)
- Florian Reichmann
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010 Graz, Austria
| | - Vanessa Wegerer
- Research Unit Electron Microscopic Techniques, Institute of Cell Biology, Histology and Embryology, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Piyush Jain
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010 Graz, Austria
| | - Raphaela Mayerhofer
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010 Graz, Austria
| | - Ahmed M Hassan
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010 Graz, Austria
| | - Esther E Fröhlich
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010 Graz, Austria
| | - Elisabeth Bock
- Research Unit Electron Microscopic Techniques, Institute of Cell Biology, Histology and Embryology, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Elisabeth Pritz
- Research Unit Electron Microscopic Techniques, Institute of Cell Biology, Histology and Embryology, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
| | - Herbert Herzog
- Neuroscience Division, Garvan Institute of Medical Research, 384 Victoria Street, Darlinghurst, Sydney, NSW 2010, Australia
| | - Peter Holzer
- Research Unit of Translational Neurogastroenterology, Institute of Experimental and Clinical Pharmacology, Medical University of Graz, Universitätsplatz 4, 8010 Graz, Austria
| | - Gerd Leitinger
- Research Unit Electron Microscopic Techniques, Institute of Cell Biology, Histology and Embryology, Medical University of Graz, Harrachgasse 21, 8010 Graz, Austria
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38
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Erion R, King AN, Wu G, Hogenesch JB, Sehgal A. Neural clocks and Neuropeptide F/Y regulate circadian gene expression in a peripheral metabolic tissue. eLife 2016; 5. [PMID: 27077948 PMCID: PMC4862751 DOI: 10.7554/elife.13552] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Accepted: 04/07/2016] [Indexed: 11/23/2022] Open
Abstract
Metabolic homeostasis requires coordination between circadian clocks in different tissues. Also, systemic signals appear to be required for some transcriptional rhythms in the mammalian liver and the Drosophila fat body. Here we show that free-running oscillations of the fat body clock require clock function in the PDF-positive cells of the fly brain. Interestingly, rhythmic expression of the cytochrome P450 transcripts, sex-specific enzyme 1 (sxe1) and Cyp6a21, which cycle in the fat body independently of the local clock, depends upon clocks in neurons expressing neuropeptide F (NPF). NPF signaling itself is required to drive cycling of sxe1 and Cyp6a21 in the fat body, and its mammalian ortholog, Npy, functions similarly to regulate cycling of cytochrome P450 genes in the mouse liver. These data highlight the importance of neuronal clocks for peripheral rhythms, particularly in a specific detoxification pathway, and identify a novel and conserved role for NPF/Npy in circadian rhythms. DOI:http://dx.doi.org/10.7554/eLife.13552.001 Many processes in the body follow rhythms that repeat over 24 hours and are synchronized to the cycle of day and night. Our sleep pattern is a well-known example, but others include daily fluctuations in body temperature and the production of several hormones. Internal clocks located in the brain and other organs drive these rhythms by altering the activity of certain genes depending on the time of day. Animals have specific organs that contain enzymes needed to break down toxic molecules in the body, and the levels of several of these enzymes rise and fall over each 24-hour period. In mammals, these enzymes are found in the liver, but in insects they are found in an organ called the fat body. Here, Erion, King et al. set out to determine the extent to which the internal clock in the brain influences the daily rhythms of these enzymes. The experiments show that a hormone released by the nervous system is required for the levels of the detoxifying enzymes to change in 24-hour cycles. This hormone – termed Neuropeptide F in fruit flies and Neuropeptide Y in mice – is also known to stimulate both mice and fruit flies to eat. Since toxic molecules often enter the body during feeding, Erion, King et al. speculate that it may be beneficial to link the detoxification process to feeding by using the same mechanism to control both processes. The next step following on from this work would be to find out exactly how neuropeptide F drives the 24-hour rhythms in the fat body and other organs. DOI:http://dx.doi.org/10.7554/eLife.13552.002
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Affiliation(s)
- Renske Erion
- Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, United States
| | - Anna N King
- Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, United States
| | - Gang Wu
- Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania, Philadelphia, United States
| | - John B Hogenesch
- Department of Molecular and Cellular Physiology, University of Cincinnati, Cincinnati, United States
| | - Amita Sehgal
- Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, United States
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Gøtzsche CR, Woldbye DPD. The role of NPY in learning and memory. Neuropeptides 2016; 55:79-89. [PMID: 26454711 DOI: 10.1016/j.npep.2015.09.010] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Revised: 09/29/2015] [Accepted: 09/29/2015] [Indexed: 01/07/2023]
Abstract
High levels of NPY expression in brain regions important for learning and memory together with its neuromodulatory and neurotrophic effects suggest a regulatory role for NPY in memory processes. Therefore it is not surprising that an increasing number of studies have provided evidence for NPY acting as a modulator of neuroplasticity, neurotransmission, and memory. Here these results are presented in relation to the types of memory affected by NPY and its receptors. NPY can exert both inhibitory and stimulatory effects on memory, depending on memory type and phase, dose applied, brain region, and NPY receptor subtypes. Thus NPY act as a resilience factor by impairing associative implicit memory after stressful and aversive events, as evident in models of fear conditioning, presumably via Y1 receptors in the amygdala and prefrontal cortex. In addition, NPY impairs acquisition but enhances consolidation and retention in models depending on spatial and discriminative types of associative explicit memory, presumably involving Y2 receptor-mediated regulations of hippocampal excitatory transmission. Moreover, spatial memory training leads to increased hippocampal NPY gene expression that together with Y1 receptor-mediated neurogenesis could constitute necessary steps in consolidation and long-term retention of spatial memory. Altogether, NPY-induced effects on learning and memory seem to be biphasic, anatomically and temporally differential, and in support of a modulatory role of NPY at keeping the system in balance. Obtaining further insight into memory-related effects of NPY could inspire the engineering of new therapeutics targeting diseases where impaired learning and memory are central elements.
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Affiliation(s)
- C R Gøtzsche
- Laboratory of Neural Plasticity, Department of Neuroscience and Pharmacology, University of Copenhagen, Denmark.
| | - D P D Woldbye
- Laboratory of Neural Plasticity, Department of Neuroscience and Pharmacology, University of Copenhagen, Denmark
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40
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Abstract
Animal models have been vital to recent advances in experimental neuroscience, including the modeling of common human brain disorders such as anxiety, depression, and schizophrenia. As mice express robust anxiety-like behaviors when exposed to stressors (e.g., novelty, bright light, or social confrontation), these phenotypes have clear utility in testing the effects of psychotropic drugs. Of specific interest is the extent to which mouse models can be used for the screening of new anxiolytic drugs and verification of their possible applications in humans. To address this problem, the present chapter will review different experimental models of mouse anxiety and discuss their utility for testing anxiolytic and anxiogenic drugs. Detailed protocols will be provided for these paradigms, and possible confounds will be addressed accordingly.
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41
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Thomas SA. Neuromodulatory signaling in hippocampus-dependent memory retrieval. Hippocampus 2015; 25:415-31. [PMID: 25475876 DOI: 10.1002/hipo.22394] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/24/2014] [Indexed: 12/15/2022]
Abstract
Considerable advances have been made toward understanding the molecular signaling events that underlie memory acquisition and consolidation. In contrast, less is known about memory retrieval, despite its necessity for utilizing learned information. This review focuses on neuromodulatory and intracellular signaling events that underlie memory retrieval mediated by the hippocampus, for which the most information is currently available. Among neuromodulators, adrenergic signaling is required for the retrieval of various types of hippocampus-dependent memory. Although they contribute to acquisition and/or consolidation, cholinergic and dopaminergic signaling are generally not required for retrieval. Interestingly, while not required for retrieval, serotonergic and opioid signaling may actually constrain memory retrieval. Roles for histamine and non-opioid neuropeptides are currently unclear but possible. A critical effector of adrenergic signaling in retrieval is reduction of the slow afterhyperpolarization mediated by β1 receptors, cyclic AMP, protein kinase A, Epac, and possibly ERK. In contrast, stress and glucocorticoids impair retrieval by decreasing cyclic AMP, mediated in part by the activation of β2 -adrenergic receptors. Clinically, alterations in neuromodulatory signaling and in memory retrieval occur in Alzheimer's disease, Down syndrome, depression, and post-traumatic stress disorder, and recent evidence has begun to link changes in neuromodulatory signaling with effects on memory retrieval.
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Affiliation(s)
- Steven A Thomas
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
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42
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Tucker LB, Fu AH, McCabe JT. Performance of Male and Female C57BL/6J Mice on Motor and Cognitive Tasks Commonly Used in Pre-Clinical Traumatic Brain Injury Research. J Neurotrauma 2015; 33:880-94. [PMID: 25951234 DOI: 10.1089/neu.2015.3977] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
To date, clinical trials have failed to find an effective therapy for victims of traumatic brain injury (TBI) who live with motor, cognitive, and psychiatric complaints. Pre-clinical investigators are now encouraged to include male and female subjects in all translational research, which is of particular interest in the field of neurotrauma given that circulating female hormones (progesterone and estrogen) have been demonstrated to exert neuroprotective effects. To determine whether behavior of male and female C57BL6/J mice is differentially impaired by TBI, male and cycling female mice were injured by controlled cortical impact and tested for several weeks with functional assessments commonly employed in pre-clinical research. We found that cognitive and motor impairments post-TBI, as measured by the Morris water maze (MWM) and rotarod, respectively, were largely equivalent in male and female animals. However, spatial working memory, assessed by the y-maze, was poorer in female mice. Female mice were generally more active, as evidenced by greater distance traveled in the first exposure to the open field, greater distance in the y-maze, and faster swimming speeds in the MWM. Statistical analysis showed that variability in all behavioral data was no greater in cycling female mice than it was in male mice. These data all suggest that with careful selection of tests, procedures, and measurements, both sexes can be included in translational TBI research without concern for effect of hormones on functional impairments or behavioral variability.
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Affiliation(s)
- Laura B Tucker
- 1 Pre-Clinical Studies Core, Center for Neuroscience and Regenerative Medicine, Uniformed Services University of the Health Sciences , Bethesda, Maryland.,2 Department of Anatomy, Physiology, and Genetics, F.E. Hébert School of Medicine, Uniformed Services University of the Health Sciences , Bethesda, Maryland
| | - Amanda H Fu
- 1 Pre-Clinical Studies Core, Center for Neuroscience and Regenerative Medicine, Uniformed Services University of the Health Sciences , Bethesda, Maryland.,2 Department of Anatomy, Physiology, and Genetics, F.E. Hébert School of Medicine, Uniformed Services University of the Health Sciences , Bethesda, Maryland
| | - Joseph T McCabe
- 1 Pre-Clinical Studies Core, Center for Neuroscience and Regenerative Medicine, Uniformed Services University of the Health Sciences , Bethesda, Maryland.,2 Department of Anatomy, Physiology, and Genetics, F.E. Hébert School of Medicine, Uniformed Services University of the Health Sciences , Bethesda, Maryland
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Alshehri B, D'Souza DG, Lee JY, Petratos S, Richardson SJ. The diversity of mechanisms influenced by transthyretin in neurobiology: development, disease and endocrine disruption. J Neuroendocrinol 2015; 27:303-23. [PMID: 25737004 DOI: 10.1111/jne.12271] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 02/23/2015] [Accepted: 02/24/2015] [Indexed: 12/12/2022]
Abstract
Transthyretin (TTR) is a protein that binds and distributes thyroid hormones (THs). TTR synthesised in the liver is secreted into the bloodstream and distributes THs around the body, whereas TTR synthesised in the choroid plexus is involved in movement of thyroxine from the blood into the cerebrospinal fluid and the distribution of THs in the brain. This is important because an adequate amount of TH is required for normal development of the brain. Nevertheless, there has been heated debate on the role of TTR synthesised by the choroid plexus during the past 20 years. We present both sides of the debate and how they can be reconciled by the discovery of TH transporters. New roles for TTR have been suggested, including the promotion of neuroregeneration, protection against neurodegeneration, and involvement in schizophrenia, behaviour, memory and learning. Recently, TTR synthesis was revealed in neurones and peripheral Schwann cells. Thus, the synthesis of TTR in the central nervous system (CNS) is more extensive than previously considered and bolsters the hypothesis that TTR may play wide roles in neurobiological function. Given the high conservation of TTR structure, function and tissue specificity and timing of gene expression, this implies that TTR has a fundamental role, during development and in the adult, across vertebrates. An alarming number of 'unnatural' chemicals can bind to TTR, thus potentially interfering with its functions in the brain. One role of TTR is delivery of THs throughout the CNS. Reduced TH availability during brain development results in a reduced IQ. The combination of the newly discovered sites of TTR synthesis in the CNS, the increasing number of neurological diseases being associated with TTR, the newly discovered functions of TTR and the awareness of the chemicals that can interfere with TTR biology render this a timely review on TTR in neurobiology.
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Affiliation(s)
- B Alshehri
- School of Medical Sciences, RMIT University, Bundoora, VIC, Australia
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Sandhu KV, Yanagawa Y, Stork O. Transcriptional regulation of glutamic acid decarboxylase in the male mouse amygdala by dietary phyto-oestrogens. J Neuroendocrinol 2015; 27:285-92. [PMID: 25650988 DOI: 10.1111/jne.12262] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 01/30/2015] [Accepted: 01/30/2015] [Indexed: 12/26/2022]
Abstract
Phyto-oestrogens are biologically active components of many human and laboratory animal diets. In the present study, we investigated, in adult male mice with C57BL/6 genetic background, the effects of a reduced phyto-oestrogens intake on anxiety-related behaviour and associated gene expression in the amygdala. After 6 weeks on a low-phyto-oestrogen diet (< 20 μg/g cumulative phyto-oestrogen content), animals showed reduced centre exploration in an open-field task compared to their littermates on a soybean-based standard diet (300 μg/g). Freezing behaviour in an auditory fear memory task, in contrast, was not affected. We hypothesised that this mildly increased anxiety may involve changes in the function of GABAergic local circuit neurones in the amygdala. Using GAD67(+/GFP) mice, we could demonstrate reduced transcription of the GAD67 gene in the lateral and basolateral amygdala under the low-phyto-oestrogen diet. Analysis of mRNA levels in microdissected samples confirmed this regulation and demonstrated concomitant changes in expression of the second glutamic acid decarboxylase (GAD) isoform, GAD65, as well as the anxiolytic neuropeptide Y. These molecular and behavioural alterations occurred without apparent changes in circulating oestrogens or testosterone levels. Our data suggest that expression regulation of interneurone-specific gene products in the amygdala may provide a mechanism for the control of anxiety-related behaviour through dietary phyto-oestrogens.
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Affiliation(s)
- K V Sandhu
- Department of Genetics & Molecular Neurobiology, Institute of Biology, Otto-von-Guericke University Magdeburg, Magdeburg, Germany
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45
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Actions of NPY, and its Y1 and Y2 receptors on pulsatile growth hormone secretion during the fed and fasted state. J Neurosci 2015; 34:16309-19. [PMID: 25471570 DOI: 10.1523/jneurosci.4622-13.2014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The hypothalamic NPY system plays an important role in regulating food intake and energy expenditure. Different biological actions of NPY are assigned to NPY receptor subtypes. Recent studies demonstrated a close relationship between food intake and growth hormone (GH) secretion; however, the mechanism through which endogenous NPY modulates GH release remains unknown. Moreover, conclusive evidence demonstrating a role for NPY and Y-receptors in regulating the endogenous pulsatile release of GH does not exist. We used genetically modified mice (germline Npy, Y1, and Y2 receptor knock-out mice) to assess pulsatile GH secretion under both fed and fasting conditions. Deletion of NPY did not impact fed GH release; however, it reversed the fasting-induced suppression of pulsatile GH secretion. The recovery of GH secretion was associated with a reduction in hypothalamic somatotropin release inhibiting factor (Srif; somatostatin) mRNA expression. Moreover, observations revealed a differential role for Y1 and Y2 receptors, wherein the postsynaptic Y1 receptor suppresses GH secretion in fasting. In contrast, the presynaptic Y2 receptor maintains normal GH output under long-term ad libitum-fed conditions. These data demonstrate an integrated neural circuit that modulates GH release relative to food intake, and provide essential information to address the differential roles of Y1 and Y2 receptors in regulating the release of GH under fed and fasting states.
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Christiansen SH, Olesen MV, Gøtzsche CR, Woldbye DPD. Anxiolytic-like effects after vector-mediated overexpression of neuropeptide Y in the amygdala and hippocampus of mice. Neuropeptides 2014; 48:335-44. [PMID: 25267070 DOI: 10.1016/j.npep.2014.09.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 09/04/2014] [Accepted: 09/08/2014] [Indexed: 11/24/2022]
Abstract
Neuropeptide Y (NPY) causes anxiolytic- and antidepressant-like effects after central administration in rodents. These effects could theoretically be utilized in future gene therapy for anxiety and depression using viral vectors for induction of overexpression of NPY in specific brain regions. Using a recombinant adeno-associated viral (rAAV) vector, we addressed this idea by testing effects on anxiolytic- and depression-like behaviours in adult mice after overexpression of NPY transgene in the amygdala and/or hippocampus, two brain regions implicated in emotional behaviours. In the amygdala, injections of rAAV-NPY caused significant anxiolytic-like effect in the open field, elevated plus maze, and light-dark transition tests. In the hippocampus, rAAV-NPY treatment was associated with anxiolytic-like effect only in the elevated plus maze. No additive effect was observed after combined rAAV-NPY injection into both the amygdala and hippocampus where anxiolytic-like effect was found in the elevated plus maze and light-dark transition tests. Antidepressant-like effects were not detected in any of the rAAV-NPY injected groups. Immobility was even increased in the tail suspension and forced swim tests after intra-amygdaloid rAAV-NPY. Taken together, the present data show that rAAV-NPY treatment may confer non-additive anxiolytic-like effect after injection into the amygdala or hippocampus, being most pronounced in the amygdala.
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Affiliation(s)
- S H Christiansen
- Laboratory for Neural Plasticity, Laboratory of Neuropsychiatry, Psychiatric Centre Copenhagen, Department of Neuroscience and Pharmacology, University of Copenhagen, Denmark
| | - M V Olesen
- Laboratory for Neural Plasticity, Laboratory of Neuropsychiatry, Psychiatric Centre Copenhagen, Department of Neuroscience and Pharmacology, University of Copenhagen, Denmark
| | - C R Gøtzsche
- Laboratory for Neural Plasticity, Laboratory of Neuropsychiatry, Psychiatric Centre Copenhagen, Department of Neuroscience and Pharmacology, University of Copenhagen, Denmark
| | - D P D Woldbye
- Laboratory for Neural Plasticity, Laboratory of Neuropsychiatry, Psychiatric Centre Copenhagen, Department of Neuroscience and Pharmacology, University of Copenhagen, Denmark.
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Freitag-Wolf S, Dommisch H, Graetz C, Jockel-Schneider Y, Harks I, Staufenbiel I, Meyle J, Eickholz P, Noack B, Bruckmann C, Gieger C, Jepsen S, Lieb W, Schreiber S, König IR, Schaefer AS. Genome-wide exploration identifies sex-specific genetic effects of alleles upstream NPY
to increase the risk of severe periodontitis in men. J Clin Periodontol 2014; 41:1115-21. [DOI: 10.1111/jcpe.12317] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/18/2014] [Indexed: 11/28/2022]
Affiliation(s)
- Sandra Freitag-Wolf
- Institute of Medical Informatics and Statistics; Christian-Albrechts-University Kiel; Kiel Germany
| | - Henrik Dommisch
- Department of Periodontology, Operative and Preventive Dentistry; Rheinische-Friedrichs-Wilhelm-University; Bonn Germany
| | - Christian Graetz
- Department of Operative Dentistry and Periodontology; Campus Kiel; University Medical Center Schleswig-Holstein; Kiel Germany
| | - Yvonne Jockel-Schneider
- Department of Periodontology; Clinic of Preventive Dentistry and Periodontology; University Medical Center of the Julius-Maximilians-University; Würzburg Germany
| | - Inga Harks
- Center of Periodontology, Operative and Preventive Dentistry; University Medical Center Münster; Münster Germany
| | - Ingmar Staufenbiel
- Department of Conservative Dentistry, Periodontology and Preventive Dentistry; Hannover Medical School; Hannover Germany
| | - Joerg Meyle
- Department of Periodontology; University Medical Center Giessen and Marburg; Giessen Germany
| | - Peter Eickholz
- Department of Periodontology; Centre for Dental, Oral, and Maxillofacial Medicine (Carolinum); Johann Wolfgang Goethe-University; Frankfurt am Main Germany
| | - Barbara Noack
- University Medical Center Carl Gustav Carus der Technischen Universität Dresden; Center of Periodontology, Operative and Preventive Dentistry; Clinic of Preventive Dentistry; Dresden Germany
| | - Corinna Bruckmann
- Department of Conservative Dentistry and Periodontology; Bernhard Gottlieb University Clinic of Dentistry; Vienna Austria
| | - Christian Gieger
- Institute of Genetic Epidemiology; Helmholtz Zentrum München; German Research Center for Environmental Health; Neuherberg Germany
| | - Søren Jepsen
- Department of Periodontology, Operative and Preventive Dentistry; Rheinische-Friedrichs-Wilhelm-University; Bonn Germany
| | - Wolfgang Lieb
- Institute of Epidemiology and Biobank popgen; University Medical Center Schleswig-Holstein; Kiel Germany
| | - Stefan Schreiber
- Institute for Clinical Molecular Biology; Christian-Albrechts-University Kiel; Kiel Germany
| | - Inke R. König
- Institute for Medical Biometry and Statistics; University of Lübeck; University Hospital Schleswig-Holstein; Lübeck Germany
| | - Arne S. Schaefer
- Institute for Clinical Molecular Biology; Christian-Albrechts-University Kiel; Kiel Germany
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Forbes SC, Cox HM. Peptide YY, neuropeptide Y and corticotrophin-releasing factor modulate gastrointestinal motility and food intake during acute stress. Neurogastroenterol Motil 2014; 26:1605-14. [PMID: 25238483 DOI: 10.1111/nmo.12428] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 08/17/2014] [Indexed: 12/12/2022]
Abstract
BACKGROUND Peripheral neuropeptide Y (NPY) provides protection against the endocrine, feeding and gastrointestinal (GI) responses to stress; however, it is not yet established how it interacts with corticotrophin-releasing factor (CRF) to mediate these effects. Peptide YY (PYY) also has significant roles in GI motility and food intake but little is known about its role in stress responses. METHODS Upper GI transit, fecal pellet output (FPO) and feeding responses, and the role of CRF1 receptors, during restraint or a novel environment stress, were ascertained in PYY-/-, NPY-/- and wild type (WT) mice, with CRF and the CRF1 antagonist, antalarmin, injected intraperitoneally. KEY RESULTS Upper GI transit and FPO were significantly increased in PYY-/- mice during restraint stress. Exogenous CRF increased defecation during placement in a novel environment in WT mice through CRF1 , while CRF1 blockade reduced defecation in WT and NPY-/- mice but had no effect in PYY-/- mice. In addition, CRF1 blockade had no effect on upper GI transit in WT mice, or on food intake in PYY-/- or NPY-/- mice, but it significantly increased food intake in WT mice. CONCLUSIONS & INFERENCES Endogenous NPY appears to inhibit the colonic motor response induced by CRF1 activation, unlike PYY, while both peptides are required for CRF1 modulation of feeding behavior during stress. Overall, these results provide new insights into the mechanism by which PYY and NPY affect stress responses.
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Affiliation(s)
- Sarah C Forbes
- King's College London, Institute of Psychiatry, Psychology & Neuroscience, London, UK
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Joshi S, Tough IR, Cox HM. Endogenous PYY and GLP-1 mediate l-glutamine responses in intestinal mucosa. Br J Pharmacol 2014; 170:1092-101. [PMID: 23992397 DOI: 10.1111/bph.12352] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Revised: 08/01/2013] [Accepted: 08/12/2013] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND AND PURPOSE l-glutamine (Gln) is an energy source for gastrointestinal (GI) epithelia and can stimulate glucagon-like peptide 1 (GLP-1) release from isolated enteroendocrine L-cells. GLP-1 and peptide YY (PYY) are co-secreted postprandially and both peptides have functional roles in glucose homeostasis and energy balance. The primary aim of this project was to establish the endogenous mechanisms underpinning Gln responses within intact GI mucosae using selective receptor antagonists. EXPERIMENTAL APPROACH Mouse mucosae from different GI regions were voltage-clamped and short-circuit current (Isc) was recorded to Gln added to either surface in the absence or presence of antagonists, using wild-type (WT) or PYY-/- tissues. The glucose sensitivity of Gln responses was also investigated by replacement with mannitol. KEY RESULTS Colonic apical and basolateral Gln responses (at 0.1 and 1 mM) were biphasic; initial increases in Isc were predominantly GLP-1 mediated. GLP-1 receptor antagonism significantly reduced the initial Gln response in the PYY-/- colon. The slower reductions in Isc to Gln were PYY-Y1 mediated as they were absent from the PYY-/- colon and were blocked selectively in WT tissue by a Y1 receptor antagonist. In jejunum mucosa, Gln stimulated monophasic Isc reductions that were PYY-Y1 receptor mediated. Gln effects were partially glucose sensitive, and Calhex 231 inhibition indicated that the calcium-sensing receptor (CaSR) was involved. CONCLUSION AND IMPLICATIONS Gln stimulates the co-release of endogenous GLP-1 and PYY from mucosal L-cells resulting in paracrine GLP-1 and Y1 receptor-mediated electrogenic epithelial responses. This glucose-sensitive mechanism appears to be CaSR mediated and could provide a significant therapeutic strategy releasing two endogenous peptides better known for their glucose-lowering and satiating effects.
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Affiliation(s)
- S Joshi
- King's College London, Wolfson Centre for Age-Related Diseases, London, UK
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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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