1
|
Mak KWY, He W, Loganathan N, Belsham DD. Bisphenol A Alters the Levels of miRNAs That Directly and/or Indirectly Target Neuropeptide Y in Murine Hypothalamic Neurons. Genes (Basel) 2023; 14:1773. [PMID: 37761913 PMCID: PMC10530511 DOI: 10.3390/genes14091773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/01/2023] [Accepted: 09/05/2023] [Indexed: 09/29/2023] Open
Abstract
The hypothalamus is a vital regulator of energy homeostasis. Orexigenic neuropeptide Y (NPY) neurons within the hypothalamus can stimulate feeding and suppress energy expenditure, and dysregulation of these neurons may contribute to obesity. We previously reported that bisphenol A (BPA), an endocrine disruptor with obesogenic properties, alters Npy transcription in hypothalamic neurons by inducing oxidative stress. We hypothesized that hypothalamic microRNAs (miRNAs), a class of small non-coding RNAs, could directly regulate Npy gene expression by binding the 3' untranslated region (UTR). Five predicted Npy-targeting miRNA candidates were uncovered through TargetScan and were detected in Npy-expressing hypothalamic neuronal cell models and hypothalamic neuronal primary cultures. BPA dysregulated the expression of a number of these hypothalamic miRNAs. We examined the effects of putative Npy-targeting miRNAs using miRNA mimics, and we found that miR-143-3p, miR-140-5p, miR-29b-1-5p, and let-7b-3p altered Npy expression in the murine hypothalamic cell lines. Importantly, miR-143-3p targets the mouse Npy 3' UTR, as detected using a luciferase construct containing the potential 3' UTR binding sites. Overall, this study established the first hypothalamic miRNA that directly targets the 3' UTR of mouse Npy, emphasizing the involvement of miRNAs in the NPY system and providing an alternative target for control of NPY levels.
Collapse
Affiliation(s)
- Kimberly W. Y. Mak
- Department of Physiology, University of Toronto, Medical Sciences Building 3247A, 1 Kings College Circle, Toronto, ON M5S 1A8, Canada; (K.W.Y.M.); (W.H.); (N.L.)
| | - Wenyuan He
- Department of Physiology, University of Toronto, Medical Sciences Building 3247A, 1 Kings College Circle, Toronto, ON M5S 1A8, Canada; (K.W.Y.M.); (W.H.); (N.L.)
| | - Neruja Loganathan
- Department of Physiology, University of Toronto, Medical Sciences Building 3247A, 1 Kings College Circle, Toronto, ON M5S 1A8, Canada; (K.W.Y.M.); (W.H.); (N.L.)
| | - Denise D. Belsham
- Department of Physiology, University of Toronto, Medical Sciences Building 3247A, 1 Kings College Circle, Toronto, ON M5S 1A8, Canada; (K.W.Y.M.); (W.H.); (N.L.)
- Department of Medicine, University of Toronto, Toronto, ON M5S 1A8, Canada
| |
Collapse
|
2
|
Naik AQ, Zafar T, Shrivastava VK. The impact of non-caloric artificial sweetener aspartame on female reproductive system in mice model. Reprod Biol Endocrinol 2023; 21:73. [PMID: 37580716 PMCID: PMC10424399 DOI: 10.1186/s12958-023-01115-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 07/05/2023] [Indexed: 08/16/2023] Open
Abstract
BACKGROUND Artificial sweeteners, used as sugar substitutes have found their ways into almost all the food items due to the notion that they are non-caloric. Aspartame is used in numerous food products throughout the world. The primary users of aspartame include diabetics and calorie conscious people who intend to limit their calorie intake. METHODS Female Swiss albino mice were divided into three groups (12 mice each) for the duration of 30 and 60 days consecutively. The treatment groups received 40 mg/kg b. w. aspartame orally. Hormone assays using ELISA and tissue histopathology have been performed along with the fertility assay to access the treatment outcomeon the fertility of treated mice in comparison to controls. RESULTS Present study reports that female mice treated with aspartame for 30 and 60 days showed significant reduction in body weight, relative organ weight of (liver and kidney) and gonadosomatic index. These changes were more significantly recorded in 60 days treatment group. Aspartame treated animals for 30 and 60 days showed duration-dependent decrease gonandotropins (follicle stimulating hormone and luteinizing hormone), and steroids (estradiol and progesterone). Moreover, severe histopathological changes, reduction in number of growing follicles, degenerative changes in follicular structure, corona radiata and zonagranulosa were also observed. Besides, histomorphological changes were also observed in the uterine structure including atrophic uterine endometrial glands, contracted endometrial lining, disruption of the endometrial structure and the shapes of blood vessels were also altered. CONCLUSION Non-nutritive artificial sweeteners including aspartame negatively impact the function of ovaries and feedback mechanism of reproductive hormones by affecting the hypothalamic-pituitary-gonadal axis. In light of present findings the aspartame negatively impacted the reproductive system of female mice. More studies are required to identify the molecular mechanism and the pathways involved.
Collapse
Affiliation(s)
- Ab Qayoom Naik
- Department of Zoology, Govt. Degree College, Paloura Mishriwala, Jammu, J & K, 180018, India.
- Laboratory of Endocrinology, Department of Biosciences, Barkatullah University, Bhopal, M. P, 462026, India.
| | - Tabassum Zafar
- Laboratory of Endocrinology, Department of Biosciences, Barkatullah University, Bhopal, M. P, 462026, India.
| | - Vinoy K Shrivastava
- Laboratory of Endocrinology, Department of Biosciences, Barkatullah University, Bhopal, M. P, 462026, India
| |
Collapse
|
3
|
McIlwraith EK, Belsham DD. Palmitate alters miR-2137 and miR-503-5p to induce orexigenic Npy in hypothalamic neuronal cell models: Rescue by oleate and docosahexaenoic acid. J Neuroendocrinol 2023; 35:e13271. [PMID: 37208960 DOI: 10.1111/jne.13271] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 03/29/2023] [Accepted: 03/30/2023] [Indexed: 05/21/2023]
Abstract
MicroRNAs (miRNAs) are short noncoding RNA implicated in the pathogenesis of obesity. One cause of obesity is excess exposure to the saturated fatty acid palmitate that can alter miRNA levels in the periphery. Palmitate also promotes obesity by acting on the hypothalamus, the central coordinator of energy homeostasis, to dysregulate hypothalamic feeding neuropeptides and induce ER stress and inflammatory signaling. We hypothesized that palmitate would alter hypothalamic miRNAs that control genes involved in energy homeostasis thereby contributing to the obesity-promoting effects of palmitate. We found that palmitate upregulated 20 miRNAs and downregulated six miRNAs in the orexigenic NPY/AgRP-expressing mHypoE-46 cell line. We focused on delineating the roles of miR-2137 and miR-503-5p, as they were strongly up- and downregulated by palmitate, respectively. Overexpression of miR-2137 increased Npy mRNA levels and downregulated Esr1 levels, while increasing C/ebpβ and Atf3 mRNA. Inhibiting miR-2137 had the opposite effect, except on Npy, which was unchanged. The most downregulated miRNA by palmitate, miR-503-5p, negatively regulated Npy mRNA levels. Exposure to the unsaturated fatty acids oleate or docosahexaenoic acid completely or partially blocked the effects of palmitate on miR-2137 and miR-503-5p as well as Npy, Agrp, Esr1, C/ebpβ and Atf3. MicroRNAs may therefore contribute to palmitate actions in dysregulating NPY/AgRP neurons. Effectively combating the deleterious effects of palmitate is crucial to help prevent or reduce the impact of obesity.
Collapse
Affiliation(s)
- Emma K McIlwraith
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Denise D Belsham
- Department of Physiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
- Departments of Medicine and Obstetrics and Gynecology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| |
Collapse
|
4
|
McIlwraith EK, Lieu CV, Belsham DD. Bisphenol A induces miR-708-5p through an ER stress-mediated mechanism altering neuronatin and neuropeptide Y expression in hypothalamic neuronal models. Mol Cell Endocrinol 2022; 539:111480. [PMID: 34624438 DOI: 10.1016/j.mce.2021.111480] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/26/2021] [Accepted: 10/01/2021] [Indexed: 01/15/2023]
Abstract
Bisphenol A (BPA) is an endocrine disrupting chemical that promotes obesity. It acts on the hypothalamus by increasing expression of the orexigenic neuropeptides, Npy and Agrp. Exactly how BPA dysregulates energy homeostasis is not completely clear. Since microRNAs (miRNA) have emerged as crucial weight regulators, the question of whether BPA could alter hypothalamic miRNA profiles was examined. Treatment of the mHypoA-59 cell line with 100 μM BPA altered a specific subset of miRNAs, and the most upregulated was miR-708-5p. BPA was found to increase the levels of miR-708-5p, and its parent gene Odz4, through the ER stress-related protein Chop. Overexpression of an miR-708-5p mimic resulted in a reduction of neuronatin, a proteolipid whose loss of expression is associated with obesity, and an increase in orexigenic Npy expression, thus potentially increasing feeding through converging regulatory pathways. Therefore, hypothalamic exposure to BPA can increase miR-708-5p that controls neuropeptides directly linked to obesity.
Collapse
Affiliation(s)
- Emma K McIlwraith
- Departments of Physiology, University of Toronto, Ontario, M5S 1A8, Canada
| | - Calvin V Lieu
- Departments of Physiology, University of Toronto, Ontario, M5S 1A8, Canada
| | - Denise D Belsham
- Departments of Physiology, University of Toronto, Ontario, M5S 1A8, Canada; Departments of Medicine, University of Toronto, Ontario, M5S 1A8, Canada; Departments of Obstetrics and Gynaecology, University of Toronto, Ontario, M5S 1A8, Canada.
| |
Collapse
|
5
|
Cano G, Hernan SL, Sved AF. Centrally Projecting Edinger-Westphal Nucleus in the Control of Sympathetic Outflow and Energy Homeostasis. Brain Sci 2021; 11:1005. [PMID: 34439626 PMCID: PMC8392615 DOI: 10.3390/brainsci11081005] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 07/13/2021] [Accepted: 07/20/2021] [Indexed: 11/16/2022] Open
Abstract
The centrally projecting Edinger-Westphal nucleus (EWcp) is a midbrain neuronal group, adjacent but segregated from the preganglionic Edinger-Westphal nucleus that projects to the ciliary ganglion. The EWcp plays a crucial role in stress responses and in maintaining energy homeostasis under conditions that require an adjustment of energy expenditure, by virtue of modulating heart rate and blood pressure, thermogenesis, food intake, and fat and glucose metabolism. This modulation is ultimately mediated by changes in the sympathetic outflow to several effector organs, including the adrenal gland, heart, kidneys, brown and white adipose tissues and pancreas, in response to environmental conditions and the animal's energy state, providing for appropriate energy utilization. Classic neuroanatomical studies have shown that the EWcp receives inputs from forebrain regions involved in these functions and projects to presympathetic neuronal populations in the brainstem. Transneuronal tracing with pseudorabies virus has demonstrated that the EWcp is connected polysynaptically with central circuits that provide sympathetic innervation to all these effector organs that are critical for stress responses and energy homeostasis. We propose that EWcp integrates multimodal signals (stress, thermal, metabolic, endocrine, etc.) and modulates the sympathetic output simultaneously to multiple effector organs to maintain energy homeostasis under different conditions that require adjustments of energy demands.
Collapse
Affiliation(s)
- Georgina Cano
- Department of Neuroscience, A210 Langley Hall, University of Pittsburgh, Pittsburgh, PA 15260, USA; (S.L.H.); (A.F.S.)
| | | | | |
Collapse
|
6
|
Duarte-Neves J, Cavadas C, Pereira de Almeida L. Neuropeptide Y (NPY) intranasal delivery alleviates Machado-Joseph disease. Sci Rep 2021; 11:3345. [PMID: 33558582 PMCID: PMC7870889 DOI: 10.1038/s41598-021-82339-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Accepted: 12/07/2020] [Indexed: 12/30/2022] Open
Abstract
Machado–Joseph disease (MJD) is the most common dominantly-inherited ataxia worldwide with no effective treatment to prevent, stop or alleviate its progression. Neuropeptide Y (NPY) is a neuroprotective agent widely expressed in the mammalian brain. Our previous work showed that NPY overexpression mediated by stereotaxically-injected viral vectors mitigates motor deficits and neuropathology in MJD mouse models. To pursue a less invasive translational approach, we investigated whether intranasal administration of NPY would alleviate cerebellar neuropathology and motor and balance impairments in a severe MJD transgenic mouse model. For that, a NPY solution was administered into mice nostrils 5 days a week. Upon 8 weeks of treatment, we observed a mitigation of motor and balance impairments through the analysis of mice behavioral tests (rotarod, beam walking, pole and swimming tests). This was in line with a reduction of cerebellar pathology, evidenced by a preservation of cerebellar granular layer and of Purkinje cells and reduction of mutant ataxin-3 aggregate numbers. Furthermore, intranasal administration of NPY did not alter body weight gain, food intake, amount of body fat nor cholesterol or triglycerides levels. Our findings support the translational potential of intranasal infusion of NPY as a pharmacological intervention in MJD.
Collapse
Affiliation(s)
- Joana Duarte-Neves
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Rua Larga, Pólo 1, Universidade de Coimbra, 3004-504, Coimbra, Portugal
| | - Cláudia Cavadas
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Rua Larga, Pólo 1, Universidade de Coimbra, 3004-504, Coimbra, Portugal. .,CIBB - Center for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504, Coimbra, Portugal. .,Faculty of Pharmacy, University of Coimbra, 3000-548, Coimbra, Portugal.
| | - Luís Pereira de Almeida
- CNC - Center for Neuroscience and Cell Biology, University of Coimbra, Rua Larga, Pólo 1, Universidade de Coimbra, 3004-504, Coimbra, Portugal. .,CIBB - Center for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504, Coimbra, Portugal. .,Faculty of Pharmacy, University of Coimbra, 3000-548, Coimbra, Portugal.
| |
Collapse
|
7
|
Desai M, Ferrini MG, Han G, Narwani K, Ross MG. Maternal High Fat Diet Programs Male Mice Offspring Hyperphagia and Obesity: Mechanism of Increased Appetite Neurons via Altered Neurogenic Factors and Nutrient Sensor AMPK. Nutrients 2020; 12:nu12113326. [PMID: 33138074 PMCID: PMC7693487 DOI: 10.3390/nu12113326] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/20/2020] [Accepted: 10/26/2020] [Indexed: 01/01/2023] Open
Abstract
Maternal high-fat (HF) is associated with offspring hyperphagia and obesity. We hypothesized that maternal HF alters fetal neuroprogenitor cell (NPC) and hypothalamic arcuate nucleus (ARC) development with preferential differentiation of neurons towards orexigenic (NPY/AgRP) versus anorexigenic (POMC) neurons, leading to offspring hyperphagia and obesity. Furthermore, these changes may involve hypothalamic bHLH neuroregulatory factors (Hes1, Mash1, Ngn3) and energy sensor AMPK. Female mice were fed either a control or a high fat (HF) diet prior to mating, and during pregnancy and lactation. HF male newborns were heavier at birth and exhibited decreased protein expression of hypothalamic bHLH factors, pAMPK/AMPK and POMC with increased AgRP. As adults, these changes persisted though with increased ARC pAMPK/AMPK. Importantly, the total NPY neurons were increased, which was consistent with the increased food intake and adult fat mass. Further, NPCs from HF newborn hypothalamic tissue showed similar changes with preferential NPC neuronal differentiation towards NPY. Lastly, the role of AMPK was further confirmed with in vitro treatment of Control NPCs with pharmacologic AMPK modulators. Thus, the altered ARC development of HF offspring results in excess appetite and reduced satiety leading to obesity. The underlying mechanism may involve AMPK/bHLH pathways.
Collapse
Affiliation(s)
- Mina Desai
- Department of Obstetrics and Gynecology, Perinatal Research Laboratory, The Lundquist Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA; (G.H.); (K.N.); (M.G.R.)
- Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, CA 90024, USA
- Correspondence: ; Tel.: +310-974-9540
| | - Monica G. Ferrini
- Department of Health and Life Sciences, Charles R. Drew University, Los Angeles, CA 90059, USA;
- Department of Internal Medicine, Charles R. Drew University, Los Angeles, CA 90059, USA
| | - Guang Han
- Department of Obstetrics and Gynecology, Perinatal Research Laboratory, The Lundquist Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA; (G.H.); (K.N.); (M.G.R.)
| | - Kavita Narwani
- Department of Obstetrics and Gynecology, Perinatal Research Laboratory, The Lundquist Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA; (G.H.); (K.N.); (M.G.R.)
| | - Michael G. Ross
- Department of Obstetrics and Gynecology, Perinatal Research Laboratory, The Lundquist Institute at Harbor-UCLA Medical Center, Torrance, CA 90502, USA; (G.H.); (K.N.); (M.G.R.)
- Department of Obstetrics and Gynecology, David Geffen School of Medicine, University of California, Los Angeles, CA 90024, USA
- Department of Obstetrics and Gynecology, Charles R. Drew University, Los Angeles, CA 90059, USA
| |
Collapse
|
8
|
de Araújo TM, Velloso LA. Hypothalamic IRX3: A New Player in the Development of Obesity. Trends Endocrinol Metab 2020; 31:368-377. [PMID: 32035736 DOI: 10.1016/j.tem.2020.01.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 01/06/2020] [Accepted: 01/09/2020] [Indexed: 12/15/2022]
Abstract
Genome-wide association studies (GWASs) have identified SNPs of the fat mass and obesity (FTO) gene as the most important risk alleles for obesity. However, how the presence of risk alleles affect phenotype is still a matter of intense investigation. In 2014, a study revealed that long-range enhancers from the intronic regions of the FTO gene regulate iroquois-class homeobox protein (IRX)3 expression. IRX3 is expressed in hypothalamic pro-opiomelanocortin (POMC) neurons and changes in its expression levels affect body adiposity by modifying food intake and energy expenditure. These findings have placed IRX3 as a potential target for the treatment of obesity. Here, we review studies that evaluated the roles of IRX3 in development, neurogenesis, and body energy homeostasis.
Collapse
Affiliation(s)
- Thiago Matos de Araújo
- Laboratory of Cell Signaling, Obesity and Comorbidities Research Center, State University of Campinas (UNICAMP), Campinas, Brazil
| | - Licio A Velloso
- Laboratory of Cell Signaling, Obesity and Comorbidities Research Center, State University of Campinas (UNICAMP), Campinas, Brazil.
| |
Collapse
|
9
|
Mintah Churcher NK, Upasham S, Rice P, Bhadsavle S, Prasad S. Development of a flexible, sweat-based neuropeptide Y detection platform. RSC Adv 2020; 10:23173-23186. [PMID: 35520310 PMCID: PMC9054693 DOI: 10.1039/d0ra03729j] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Accepted: 06/05/2020] [Indexed: 12/14/2022] Open
Abstract
Neuropeptide Y (NPY) biomarker levels have a close association with the diagnosis of Major Depression Disorder (MDD) and anxiety disorders. Quantifying NPY in correlation to self-reported symptoms will be an important measure to ensure a relatively uniform diagnosis and help with disease prognosis of these disorders. The work presented is a novel, passive eccrine sweat based, electrochemical detection platform for quantification of NPY biomarker levels. The paper offers a comparison between non-porous and porous sensor platforms using various electrochemical detection techniques. This work uses a novel strategy towards designing an optimal nanobioelectronic interface to measure NPY. The portability aspect of this detection platform is discussed by the demonstration a novel, portable EmStat Pico based electronic platform. The detection limit of the sensor is 10 pg mL−1 and its range is 20–500 pg mL−1. The NPY detection platform is envisioned to be a wearable point-of need monitoring system for management of chronic anxiety disorders and MDD. Novel wearable NPY biomarker tracking system, envisioned to be a chronic anxiety and MDD management platform via self-monitoring.![]()
Collapse
Affiliation(s)
| | - Sayali Upasham
- Department of Bioengineering
- University of Texas at Dallas
- Richardson
- USA
| | - Paul Rice
- Department of Bioengineering
- University of Texas at Dallas
- Richardson
- USA
| | - Serena Bhadsavle
- Department of Bioengineering
- University of Texas at Dallas
- Richardson
- USA
| | - Shalini Prasad
- Department of Bioengineering
- University of Texas at Dallas
- Richardson
- USA
| |
Collapse
|
10
|
Keihani S, Kluever V, Mandad S, Bansal V, Rahman R, Fritsch E, Gomes LC, Gärtner A, Kügler S, Urlaub H, Wren JD, Bonn S, Rizzoli SO, Fornasiero EF. The long noncoding RNA neuroLNC regulates presynaptic activity by interacting with the neurodegeneration-associated protein TDP-43. SCIENCE ADVANCES 2019; 5:eaay2670. [PMID: 31897430 PMCID: PMC6920028 DOI: 10.1126/sciadv.aay2670] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 10/23/2019] [Indexed: 05/26/2023]
Abstract
The cellular and the molecular mechanisms by which long noncoding RNAs (lncRNAs) may regulate presynaptic function and neuronal activity are largely unexplored. Here, we established an integrated screening strategy to discover lncRNAs implicated in neurotransmitter and synaptic vesicle release. With this approach, we identified neuroLNC, a neuron-specific nuclear lncRNA conserved from rodents to humans. NeuroLNC is tuned by synaptic activity and influences several other essential aspects of neuronal development including calcium influx, neuritogenesis, and neuronal migration in vivo. We defined the molecular interactors of neuroLNC in detail using chromatin isolation by RNA purification, RNA interactome analysis, and protein mass spectrometry. We found that the effects of neuroLNC on synaptic vesicle release require interaction with the RNA-binding protein TDP-43 (TAR DNA binding protein-43) and the selective stabilization of mRNAs encoding for presynaptic proteins. These results provide the first proof of an lncRNA that orchestrates neuronal excitability by influencing presynaptic function.
Collapse
Affiliation(s)
- S. Keihani
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Excellence Cluster Multiscale Bioimaging, 37073 Göttingen, Germany
| | - V. Kluever
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Excellence Cluster Multiscale Bioimaging, 37073 Göttingen, Germany
| | - S. Mandad
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Excellence Cluster Multiscale Bioimaging, 37073 Göttingen, Germany
- Department of Clinical Chemistry, University Medical Center Göttingen, 37077 Göttingen, Germany
| | - V. Bansal
- Institute of Medical Systems Biology, Center for Molecular Neurobiology (ZMNH), UKE, 20246 Hamburg, Germany
- German Center for Neurodegenerative Diseases (DZNE), 72076 Tübingen, Germany
| | - R. Rahman
- Institute of Medical Systems Biology, Center for Molecular Neurobiology (ZMNH), UKE, 20246 Hamburg, Germany
| | - E. Fritsch
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Excellence Cluster Multiscale Bioimaging, 37073 Göttingen, Germany
| | - L. Caldi Gomes
- Department of Neurology, University Medical Center Göttingen, 37073 Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration (BIN), 37075 Göttingen, Germany
| | - A. Gärtner
- VIB Center for the Biology of Disease and Center for Human Genetics, KU Leuven, Leuven, Belgium
| | - S. Kügler
- Department of Neurology, University Medical Center Göttingen, 37073 Göttingen, Germany
| | - H. Urlaub
- Department of Clinical Chemistry, University Medical Center Göttingen, 37077 Göttingen, Germany
- Bioanalytical Mass Spectrometry Group, Max Planck Institute of Biophysical Chemistry, 37077 Göttingen, Germany
| | - J. D. Wren
- Department of Genes and Human Disease, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA
| | - S. Bonn
- Institute of Medical Systems Biology, Center for Molecular Neurobiology (ZMNH), UKE, 20246 Hamburg, Germany
- German Center for Neurodegenerative Diseases (DZNE), 72076 Tübingen, Germany
| | - S. O. Rizzoli
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Excellence Cluster Multiscale Bioimaging, 37073 Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration (BIN), 37075 Göttingen, Germany
| | - E. F. Fornasiero
- Department of Neuro- and Sensory Physiology, University Medical Center Göttingen, Excellence Cluster Multiscale Bioimaging, 37073 Göttingen, Germany
- Center for Biostructural Imaging of Neurodegeneration (BIN), 37075 Göttingen, Germany
| |
Collapse
|
11
|
Cleal JK, Bruce KD, Shearer JL, Thomas H, Plume J, Gregory L, Shepard JN, Spiers-Fitzgerald KL, Mani R, Lewis RM, Lillycrop KA, Hanson MA, Byrne CD, Cagampang FR. Maternal Obesity during Pregnancy Alters Daily Activity and Feeding Cycles, and Hypothalamic Clock Gene Expression in Adult Male Mouse Offspring. Int J Mol Sci 2019; 20:E5408. [PMID: 31671625 PMCID: PMC6862679 DOI: 10.3390/ijms20215408] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 10/12/2019] [Accepted: 10/28/2019] [Indexed: 02/07/2023] Open
Abstract
An obesogenic diet adversely affects the endogenous mammalian circadian clock, altering daily activity and metabolism, and resulting in obesity. We investigated whether an obese pregnancy can alter the molecular clock in the offspring hypothalamus, resulting in changes to their activity and feeding rhythms. Female mice were fed a control (C, 7% kcal fat) or high fat diet (HF, 45% kcal fat) before mating and throughout pregnancy. Male offspring were fed the C or HF diet postweaning, resulting in four offspring groups: C/C, C/HF, HF/C, and HF/HF. Daily activity and food intake were monitored, and at 15 weeks of age were killed at six time-points over 24 h. The clock genes Clock, Bmal1, Per2, and Cry2 in the suprachiasmatic nucleus (SCN) and appetite genes Npy and Pomc in the arcuate nucleus (ARC) were measured. Daily activity and feeding cycles in the HF/C, C/HF, and HF/HF offspring were altered, with increased feeding bouts and activity during the day and increased food intake but reduced activity at night. Gene expression patterns and levels of Clock, Bmal1, Per2, and Cry2 in the SCN and Npy and Pomc in the ARC were altered in HF diet-exposed offspring. The altered expression of hypothalamic molecular clock components and appetite genes, together with changes in activity and feeding rhythms, could be contributing to offspring obesity.
Collapse
Affiliation(s)
- Jane K Cleal
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Kimberley D Bruce
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Jasmin L Shearer
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Hugh Thomas
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Jack Plume
- Centre for Biological Sciences, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton SO17 1BJ, UK.
| | - Louise Gregory
- Centre for Biological Sciences, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton SO17 1BJ, UK.
| | - James N Shepard
- Centre for Biological Sciences, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton SO17 1BJ, UK.
| | - Kerry L Spiers-Fitzgerald
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Ravi Mani
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Rohan M Lewis
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Karen A Lillycrop
- Centre for Biological Sciences, Faculty of Natural and Environmental Sciences, University of Southampton, Southampton SO17 1BJ, UK.
| | - Mark A Hanson
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Christopher D Byrne
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| | - Felino R Cagampang
- School of Human Development and Health, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton SO16 6YD, UK.
| |
Collapse
|
12
|
Gomes JVP, Rigolon TCB, Souza MSDS, Alvarez-Leite JI, Lucia CMD, Martino HSD, Rosa CDOB. Antiobesity effects of anthocyanins on mitochondrial biogenesis, inflammation, and oxidative stress: A systematic review. Nutrition 2019; 66:192-202. [DOI: 10.1016/j.nut.2019.05.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 04/11/2019] [Accepted: 05/27/2019] [Indexed: 12/31/2022]
|
13
|
Abstract
Sensitization of the transient receptor potential ion channel vanilloid 1 (TRPV1) is critically involved in inflammatory pain. To date, manifold signaling cascades have been shown to converge onto TRPV1 and enhance its sensitization. However, many of them also play a role for nociceptive pain, which limits their utility as targets for therapeutic intervention. Here, we show that the vesicle transport through interaction with t-SNAREs homolog 1B (Vti1b) protein promotes TRPV1 sensitization upon inflammation in cell culture but leaves normal functioning of TRPV1 intact. Importantly, the effect of Vti1b can be recapitulated in vivo: Virus-mediated knockdown of Vti1b in sensory neurons attenuated thermal hypersensitivity during inflammatory pain without affecting mechanical hypersensitivity or capsaicin-induced nociceptive pain. Interestingly, TRPV1 and Vti1b are localized in close vicinity as indicated by proximity ligation assays and are likely to bind to each other, either directly or indirectly, as suggested by coimmunoprecipitations. Moreover, using a mass spectrometry-based quantitative interactomics approach, we show that Vti1b is less abundant in TRPV1 protein complexes during inflammatory conditions compared with controls. Alongside, we identify numerous novel and pain state-dependent binding partners of native TRPV1 in dorsal root ganglia. These data represent a unique resource on the dynamics of the TRPV1 interactome and facilitate mechanistic insights into TRPV1 regulation. We propose that inflammation-related differences in the TRPV1 interactome identified here could be exploited to specifically target inflammatory pain in the future.
Collapse
|
14
|
Hayashi Y, Ito Y, Naito H, Tamada H, Yamagishi N, Kondo T, Ishikawa T, Gonzalez FJ, Nakajima T. In utero exposure to di(2-ethylhexyl)phthalate suppresses blood glucose and leptin levels in the offspring of wild-type mice. Toxicology 2019; 415:49-55. [PMID: 30660623 DOI: 10.1016/j.tox.2019.01.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 01/11/2019] [Accepted: 01/14/2019] [Indexed: 01/09/2023]
Abstract
Exposure of pregnant mice to di(2-ethylhexyl)phthalate (DEHP) induces maternal lipid malnutrition and decreases the number of live fetuses/pups. In this study, we aimed to clarify the relationship between maternal lipid malnutrition and the nutritional status of the neonatal, lactational, and adult offspring, as well as the role of peroxisome proliferator-activated receptor α (PPARα) in these relationships. Sv/129 wild-type (mPPARA), Ppara-null, and PPARα-humanized (hPPARA) mice were fed diets containing 0, 0.01, 0.05, or 0.1% DEHP in utero and/or during the lactational stage. The male offspring were killed on postnatal day 2 or 21, or after 11 weeks. Exposure to either 0.05% or 0.1% DEHP during both the in utero and lactational periods decreased serum glucose concentrations in 2-day-old mPPARA offspring. These dosages also decreased both serum and plasma leptin levels in both 2- and 21-day-old mPPARA offspring. In contrast, exposure to DEHP only during the lactational period did not decrease leptin levels, suggesting the importance of in utero exposure to DEHP. Exposure to 0.05% DEHP during the in utero and lactational periods also increased food consumption after weaning in both mPPARA and hPPARA mice; this was not observed in Ppara-null offspring. In conclusion, in utero exposure to DEHP induces neonatal serum glucose malnutrition via PPARα. DEHP also decreases serum and plasma leptin concentrations in offspring during the neonatal and weaning periods, in association with PPARα, which presumably results in increased of food consumption after weaning.
Collapse
Affiliation(s)
- Yumi Hayashi
- Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, 1-1-20 Daiko-Minami, Higashi-ku, Nagoya, 461-8673, Japan; In vivo Real-time Omics Laboratory, Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.
| | - Yuki Ito
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, 467-8601, Japan.
| | - Hisao Naito
- Department of Public Health, Fujita Health University School of Medicine, Dengakugakubo 1-98, Kutsukake-cho, Toyoake, 470-1192, Japan.
| | - Hazuki Tamada
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan.
| | - Nozomi Yamagishi
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, 466-8550, Japan.
| | - Takaaki Kondo
- Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, 1-1-20 Daiko-Minami, Higashi-ku, Nagoya, 461-8673, Japan.
| | - Tetsuya Ishikawa
- Pathophysiological Laboratory Sciences, Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, 1-1-20 Daiko-Minami, Higashi-ku, Nagoya, 461-8673, Japan.
| | - Frank J Gonzalez
- Laboratory of Metabolism, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
| | - Tamie Nakajima
- College of Life and Health Sciences, Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi, 487-8501, Japan.
| |
Collapse
|
15
|
Mancini G, Horvath TL. Viral Vectors for Studying Brain Mechanisms that Control Energy Homeostasis. Cell Metab 2018; 27:1168-1175. [PMID: 29874565 DOI: 10.1016/j.cmet.2018.05.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 03/18/2018] [Accepted: 05/16/2018] [Indexed: 12/26/2022]
Abstract
Viral vectors have been shown to be potent and versatile tools for genome editing. In the present Minireview, we focus on lentiviruses and adeno-associated viruses as vectors and their use in the study of the hypothalamic circuits involved in the regulation of energy homeostasis.
Collapse
Affiliation(s)
- Giacomo Mancini
- Program in Integrative Cell Signalling and Neurobiology of Metabolism, Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT 06520, USA.
| | - Tamas L Horvath
- Program in Integrative Cell Signalling and Neurobiology of Metabolism, Department of Comparative Medicine, Yale University School of Medicine, New Haven, CT 06520, USA; Department of Anatomy and Histology, University of Veterinary Medicine, Budapest 1078, Hungary.
| |
Collapse
|
16
|
Effects of Neuropeptide Y on Stem Cells and Their Potential Applications in Disease Therapy. Stem Cells Int 2017; 2017:6823917. [PMID: 29109742 PMCID: PMC5646323 DOI: 10.1155/2017/6823917] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 08/01/2017] [Accepted: 08/08/2017] [Indexed: 01/04/2023] Open
Abstract
Neuropeptide Y (NPY), a 36-amino acid peptide, is widely distributed in the central and peripheral nervous systems and other peripheral tissues. It takes part in regulating various biological processes including food intake, circadian rhythm, energy metabolism, and neuroendocrine secretion. Increasing evidence indicates that NPY exerts multiple regulatory effects on stem cells. As a kind of primitive and undifferentiated cells, stem cells have the therapeutic potential to replace damaged cells, secret paracrine molecules, promote angiogenesis, and modulate immunity. Stem cell-based therapy has been demonstrated effective and considered as one of the most promising treatments for specific diseases. However, several limitations still hamper its application, such as poor survival and low differentiation and integration rates of transplanted stem cells. The regulatory effects of NPY on stem cell survival, proliferation, and differentiation may be helpful to overcome these limitations and facilitate the application of stem cell-based therapy. In this review, we summarized the regulatory effects of NPY on stem cells and discussed their potential applications in disease therapy.
Collapse
|
17
|
Ailanen L, Ruohonen ST, Vähätalo LH, Tuomainen K, Eerola K, Salomäki-Myftari H, Röyttä M, Laiho A, Ahotupa M, Gylling H, Savontaus E. The metabolic syndrome in mice overexpressing neuropeptide Y in noradrenergic neurons. J Endocrinol 2017; 234:57-72. [PMID: 28468933 DOI: 10.1530/joe-16-0223] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 05/03/2017] [Indexed: 12/21/2022]
Abstract
A gain-of-function polymorphism in human neuropeptide Y (NPY) gene (rs16139) associates with metabolic disorders and earlier onset of type 2 diabetes (T2D). Similarly, mice overexpressing NPY in noradrenergic neurons (OE-NPYDBH) display obesity and impaired glucose metabolism. In this study, the metabolic syndrome-like phenotype was characterized and mechanisms of impaired hepatic fatty acid, cholesterol and glucose metabolism in pre-obese (2-month-old) and obese (4-7-month-old) OE-NPYDBH mice were elucidated. Susceptibility to T2D was assessed by subjecting mice to high caloric diet combined with low-dose streptozotocin. Contribution of hepatic Y1-receptor to the phenotype was studied using chronic treatment with an Y1-receptor antagonist, BIBO3304. Obese OE-NPYDBH mice displayed hepatosteatosis and hypercholesterolemia preceded by decreased fatty acid oxidation and accelerated cholesterol synthesis. Hyperinsulinemia in early obese state inhibited pyruvate- and glucose-induced hyperglycemia, and deterioration of glucose metabolism of OE-NPYDBH mice developed with aging. Furthermore, streptozotocin induced T2D only in OE-NPYDBH mice. Hepatic inflammation was not morphologically visible, but upregulated hepatic anti-inflammatory pathways and increased 8-isoprostane combined with increased serum resistin and decreased interleukin 10 pointed to increased NPY-induced oxidative stress that may predispose OE-NPYDBH mice to insulin resistance. Chronic treatment with BIBO3304 did not improve the metabolic status of OE-NPYDBH mice. Instead, downregulation of beta-1-adrenoceptors suggests indirect actions of NPY via inhibition of sympathetic nervous system. In conclusion, changes in hepatic fatty acid, cholesterol and glucose metabolism favoring energy storage contribute to the development of NPY-induced metabolic syndrome, and the effect is likely mediated by changes in sympathetic nervous system activity.
Collapse
Affiliation(s)
- Liisa Ailanen
- Institute of Biomedicine and Turku Center for Disease Modelling; Drug Research Doctoral ProgramUniversity of Turku, Turku, Finland
| | - Suvi T Ruohonen
- Institute of Biomedicine and Turku Center for Disease ModellingUniversity of Turku, Turku, Finland
| | - Laura H Vähätalo
- Institute of Biomedicine and Turku Center for Disease ModellingUniversity of Turku, Turku, Finland
| | - Katja Tuomainen
- Institute of Biomedicine and Turku Center for Disease ModellingUniversity of Turku, Turku, Finland
| | - Kim Eerola
- Institute of Biomedicine and Turku Center for Disease ModellingUniversity of Turku, Turku, Finland
| | - Henriikka Salomäki-Myftari
- Institute of Biomedicine and Turku Center for Disease Modelling; Drug Research Doctoral ProgramUniversity of Turku, Turku, Finland
| | - Matias Röyttä
- Department of PathologyUniversity of Turku and Turku University Hospital, Turku, Finland
| | - Asta Laiho
- Turku Centre for BiotechnologyUniversity of Turku and Åbo Akademi University, Turku, Finland
| | - Markku Ahotupa
- Research Centre of Applied and Preventive Cardiovascular MedicineUniversity of Turku, Turku, Finland
| | - Helena Gylling
- Department of Internal MedicineUniversity of Helsinki and Helsinki University Central Hospital, Helsinki, Finland
| | - Eriika Savontaus
- Institute of Biomedicine and Turku Center for Disease ModellingUniversity of Turku; Turku University Hospital, Unit of Clinical Pharmacology, Turku, Finland
| |
Collapse
|
18
|
Bartkowska K, Swiatek I, Aniszewska A, Jurewicz E, Turlejski K, Filipek A, Djavadian RL. Stress-Dependent Changes in the CacyBP/SIP Interacting Protein S100A6 in the Mouse Brain. PLoS One 2017; 12:e0169760. [PMID: 28068373 PMCID: PMC5221789 DOI: 10.1371/journal.pone.0169760] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 12/21/2016] [Indexed: 11/18/2022] Open
Abstract
The CacyBP/SIP target S100A6 is widely present in the nervous system, and its up-regulation is associated with certain neurodegenerative diseases. Here, we examined the involvement of S100A6 protein in stress responses in mice. Using Western blotting, we observed a marked change in brainstem structures, whereby stressed mice showed approximately one-third the protein level produced in the control group. A decreased level of S100A6 protein in stressed animals was also detected in the olfactory bulb and the cerebellum and stress-related structures such as the hippocampus and the hypothalamus. Additionally, using immunohistochemistry, high levels of S100A6 expression were observed in astrocytes localized in the border zones of all brain ventricles, tanycytes of the ventro-lateral walls of the hypothalamus, including the arcuate nucleus (ARH) and low levels of this protein were in neurons of the olfactory bulb, the hippocampus, the thalamus, the cerebral cortex, the brainstem and the cerebellum. Although S100A6-expressing cells in all these brain structures did not change their phenotype in response to stress, the intensity of immunofluorescent labeling in all studied structures was lower in stressed mice than in control animals. For example, in the ARH, where extremely strong immunostaining was observed, the number of immunolabeled fibers was decreased by approximately half in the stressed group compared with the controls. Although these results are descriptive and do not give clue about functional role of S100A6 in stress, they indicate that the level of S100A6 decreases in several brain structures in response to chronic mild stress, suggesting that this protein may modify stress responses.
Collapse
Affiliation(s)
- Katarzyna Bartkowska
- Nencki Institute of Experimental Biology Polish Academy of Sciences, Warsaw, Poland
| | | | - Agata Aniszewska
- Nencki Institute of Experimental Biology Polish Academy of Sciences, Warsaw, Poland
| | - Ewelina Jurewicz
- Nencki Institute of Experimental Biology Polish Academy of Sciences, Warsaw, Poland
| | | | - Anna Filipek
- Nencki Institute of Experimental Biology Polish Academy of Sciences, Warsaw, Poland
- * E-mail: (AF); (RD)
| | - Rouzanna L. Djavadian
- Nencki Institute of Experimental Biology Polish Academy of Sciences, Warsaw, Poland
- * E-mail: (AF); (RD)
| |
Collapse
|
19
|
Klemettilä JP, Kampman O, Solismaa A, Lyytikäinen LP, Seppälä N, Viikki M, Hämäläinen M, Moilanen E, Mononen N, Lehtimäki T, Leinonen E. Association Study of Arcuate Nucleus Neuropeptide Y Neuron Receptor Gene Variation And Serum Npy Levels in Clozapine Treated Patients With Schizophrenia. Eur Psychiatry 2016; 40:13-19. [DOI: 10.1016/j.eurpsy.2016.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Revised: 07/14/2016] [Accepted: 07/16/2016] [Indexed: 11/29/2022] Open
Abstract
AbstractBackgroundAntipsychotic-induced weight gain (AIWG) leads to metabolic consequences and comorbidity, social stigmatization and nonadherence in patients with schizophrenia. Neuropeptide Y (NPY) has an important role in appetite and body weight regulation. Associations between AIWG and serum NPY levels, and genetic polymorphisms (SNPs) associated with its serum levels have been little studied in these patients.Subjects and methodsAssociations between serum NPY concentration and other metabolic and inflammatory markers, and 215 SNPs in 21 genes (NPY gene, NPY receptor genes and genes encoding arcuate nucleus NPY neuron receptors) were studied in 180 patients with schizophrenia on clozapine treatment.ResultsThe serum levels of NPY correlated with levels of resistin (r = 0.31, P < 0.001) and age (r = 0.22, P = 0.003). In the general linear univariate model the best-fitting model with explanatory factors age, serum resistin level, serum insulin level, BMI and gender explained 18.0% (P < 0.001) of the variance of serum NPY. Genetic risk score (GRSNPY) analysis found twelve significant (P < 0.05) serum NPY concentration related SNPs among α7 nicotinic acetylcholine receptor gene CHRNA7, insulin receptor gene INSR, leptin receptor gene LEPR, glucocorticoid receptor (GR) gene NR3C1, and NPY gene. However, after permutation test of gene score the predictive value of GRSNPY remained non-significant (P = 0.078).ConclusionsSerum NPY level does not seem to be a feasible biomarker of AIWG. Serum NPY level alterations are not significantly associated with the candidate gene polymorphisms studied.
Collapse
|
20
|
Zhang QJ, Yang CC, Zhang SY, Zhang LH, Li J. Alteration of NPY in hypothalamus and its correlation with leptin and ghrelin during the development of T2DM in a rat model. SPRINGERPLUS 2016; 5:1913. [PMID: 27867820 PMCID: PMC5095108 DOI: 10.1186/s40064-016-3555-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 10/14/2016] [Indexed: 12/20/2022]
Abstract
Objectives This study aimed to investigate the alteration of Neuropeptide Y (NPY) in the hypothalamus and its correlation with insulin, leptin and ghrelin during the development of a rat model of type 2 diabetes mellitus. Methods The type 2 diabetes mellitus model was developed in diet-induced obesity (DIO) rats followed by the intraperitoneal injection of low-dose streptozotocin (STZ, 25 mg/kg). At four time points during the development of type 2 diabetes mellitus in rats, the fasting serum insulin, leptin, and plasma ghrelin were measured and the hypothalamic neuropeptide Y (NPY) content and mRNA expression were detected in the rats, which were divided into 4 groups: normal control (NC), DIO4W, DIO8W, and T2DM; the mRNA expression of OB-Rb, and GSH-R1a in the hypothalamus were also assayed. Results During the development of the type 2 diabetes mellitus rat model, both the fasting serum levels of insulin and leptin (ng/ml) elevated significantly and the fasting plasma ghrelin concentration decreased the hypothalamic NPY (pg/mg) content significantly. NPY mRNA increased significantly in a time-dependent fashion while both the OB-Rb and the GHS-R1a mRNA of the hypothalamus decreased significantly. Hypothalamic NPY concentration was positively correlated with the changes in serum insulin and leptin and negatively correlated with plasma ghrelin. Conclusions During the development of the type 2 diabetes mellitus rat model, the hypothalamic NPY content and NPY mRNA expression increased in a time-dependent manner, which was positively correlated with the changes of the serum insulin and leptin and negatively correlated with the plasma ghrelin.
Collapse
Affiliation(s)
- Qing-Jiu Zhang
- Department of Neurosurgery, The Second Hospital of Hebei Medical University, Shijiazhuang, 050000 Hebei People's Republic of China.,Department of Endocrinology, The Second Hospital of Hebei Medical University, No. 215 Hepingxi Road Xinhua District, Shijiazhuang, 050000 People's Republic of China
| | - Chang-Chun Yang
- The First Department of South Storied Building, The General Hospital of Chinese People's Armed Police Forces, Beijing, 100039 People's Republic of China
| | - Song-Yun Zhang
- Department of Endocrinology, The Second Hospital of Hebei Medical University, No. 215 Hepingxi Road Xinhua District, Shijiazhuang, 050000 People's Republic of China
| | - Li-Hui Zhang
- Department of Endocrinology, The Second Hospital of Hebei Medical University, No. 215 Hepingxi Road Xinhua District, Shijiazhuang, 050000 People's Republic of China
| | - Jie Li
- Department of Endocrinology, The Second Hospital of Hebei Medical University, No. 215 Hepingxi Road Xinhua District, Shijiazhuang, 050000 People's Republic of China
| |
Collapse
|
21
|
Neuropeptide Y (NPY) as a therapeutic target for neurodegenerative diseases. Neurobiol Dis 2016; 95:210-24. [PMID: 27461050 DOI: 10.1016/j.nbd.2016.07.022] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Revised: 06/29/2016] [Accepted: 07/20/2016] [Indexed: 12/16/2022] Open
Abstract
Neuropeptide Y (NPY) and NPY receptors are widely expressed in the mammalian central nervous system. Studies in both humans and rodent models revealed that brain NPY levels are altered in some neurodegenerative disorders, such as Alzheimer's disease, Parkinson's disease, Huntington's disease and Machado-Joseph disease. In this review, we will focus on the roles of NPY in the pathological mechanisms of these disorders, highlighting NPY as a neuroprotective agent, as a neural stem cell proliferative agent, as an agent that increases trophic support, as a stimulator of autophagy and as an inhibitor of excitotoxicity and neuroinflammation. Moreover, the effect of NPY in some clinical manifestations commonly observed in Alzheimer's disease, Parkinson's disease, Huntington's disease and Machado-Joseph disease, such as depressive symptoms and body weight loss, are also discussed. In conclusion, this review highlights NPY system as a potential therapeutic target in neurodegenerative diseases.
Collapse
|
22
|
Mele P, Zammaretti F, Longo A, Panzica G, Oberto A, Eva C. Sex-dependent regulation of hypothalamic neuropeptide Y-Y1 receptor gene expression in leptin treated obese (ob/ob) or lean mice. Brain Res 2016; 1649:102-109. [PMID: 27425429 DOI: 10.1016/j.brainres.2016.07.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 06/22/2016] [Accepted: 07/14/2016] [Indexed: 01/05/2023]
Abstract
Pharmacological and genetic studies have shown that the Y1 receptor (Y1R) for Neuropeptide Y (NPY) plays a crucial role in the control of feeding behavior under metabolic conditions of low leptin levels or leptin deficiency. In this study, we investigated the effect of leptin deficiency and leptin replacement on Y1R gene expression in the hypothalamus of lean and obese Y1R/LacZ transgenic mice (TgY1R/LacZ) carrying the murine Y1R promoter linked to the LacZ gene that induces the expression of β-galactosidase. Two daily intraperitoneal injections with leptin (1μg/g of body weight for one week) of male and female lean (TgY1R/LacZ+/+) and obese (TgY1R/LacZob/ob) mice induced a significant decrease of body weight in both sexes and genotypes. In males, leptin administration decreased β-galactosidase activity in the PVN and DMH of lean mice, and increased transgene expression in the same hypothalamic nuclei of obese mice. Sex-related differences were also observed in both genotypes, since leptin treatment failed to affect transgene expression in hypothalamus of lean and obese female mice. These results provide further evidence for a sexual dimorphism of the hypothalamic NPY-Y1R-mediated pathway in response to changes in leptin circulating levels.
Collapse
Affiliation(s)
- Paolo Mele
- Department of Neuroscience, University of Turin, C.so Massimo d'Azeglio 52, Torino, Italy; Neuroscience Institute of the Cavalieri-Ottolenghi Foundation (NICO), Regione Gonzole 10, 10043 Orbassano, Torino, Italy
| | - Francesca Zammaretti
- Department of Neuroscience, University of Turin, C.so Massimo d'Azeglio 52, Torino, Italy
| | - Angela Longo
- Department of Neuroscience, University of Turin, C.so Massimo d'Azeglio 52, Torino, Italy; Neuroscience Institute of the Cavalieri-Ottolenghi Foundation (NICO), Regione Gonzole 10, 10043 Orbassano, Torino, Italy
| | - Giancarlo Panzica
- Department of Neuroscience, University of Turin, C.so Massimo d'Azeglio 52, Torino, Italy; Neuroscience Institute of the Cavalieri-Ottolenghi Foundation (NICO), Regione Gonzole 10, 10043 Orbassano, Torino, Italy
| | - Alessandra Oberto
- Department of Neuroscience, University of Turin, C.so Massimo d'Azeglio 52, Torino, Italy; Neuroscience Institute of the Cavalieri-Ottolenghi Foundation (NICO), Regione Gonzole 10, 10043 Orbassano, Torino, Italy
| | - Carola Eva
- Department of Neuroscience, University of Turin, C.so Massimo d'Azeglio 52, Torino, Italy; Neuroscience Institute of the Cavalieri-Ottolenghi Foundation (NICO), Regione Gonzole 10, 10043 Orbassano, Torino, Italy.
| |
Collapse
|
23
|
Martins J, Elvas F, Brudzewsky D, Martins T, Kolomiets B, Tralhão P, Gøtzsche CR, Cavadas C, Castelo-Branco M, Woldbye DPD, Picaud S, Santiago AR, Ambrósio AF. Activation of Neuropeptide Y Receptors Modulates Retinal Ganglion Cell Physiology and Exerts Neuroprotective Actions In Vitro. ASN Neuro 2015; 7:7/4/1759091415598292. [PMID: 26311075 PMCID: PMC4552225 DOI: 10.1177/1759091415598292] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Neuropeptide Y (NPY) is expressed in mammalian retina but the location and potential modulatory effects of NPY receptor activation remain largely unknown. Retinal ganglion cell (RGC) death is a hallmark of several retinal degenerative diseases, particularly glaucoma. Using purified RGCs and ex vivo rat retinal preparations, we have measured RGC intracellular free calcium concentration ([Ca2+]i) and RGC spiking activity, respectively. We found that NPY attenuated the increase in the [Ca2+]i triggered by glutamate mainly via Y1 receptor activation. Moreover, (Leu31, Pro34)−NPY, a Y1/Y5 receptor agonist, increased the initial burst response of OFF-type RGCs, although no effect was observed on RGC spontaneous spiking activity. The Y1 receptor activation was also able to directly modulate RGC responses by attenuating the NMDA-induced increase in RGC spiking activity. These results suggest that Y1 receptor activation, at the level of inner or outer plexiform layers, leads to modulation of RGC receptive field properties. Using in vitro cultures of rat retinal explants exposed to NMDA, we found that NPY pretreatment prevented NMDA-induced cell death. However, in an animal model of retinal ischemia-reperfusion injury, pretreatment with NPY or (Leu31, Pro34)−NPY was not able to prevent apoptosis or rescue RGCs. In conclusion, we found modulatory effects of NPY application that for the first time were detected at the level of RGCs. However, further studies are needed to evaluate whether NPY neuroprotective actions detected in retinal explants can be translated into animal models of retinal degenerative diseases.
Collapse
Affiliation(s)
- João Martins
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal
| | - Filipe Elvas
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal AIBILI, 3000-548 Coimbra, Portugal
| | - Dan Brudzewsky
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal AIBILI, 3000-548 Coimbra, Portugal
| | - Tânia Martins
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal AIBILI, 3000-548 Coimbra, Portugal
| | - Bogdan Kolomiets
- Sorbonne Universités, UPMC Univ Paris 06, Institut de la Vision, UMR_S968, 75012 Paris, France
| | - Pedro Tralhão
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal
| | - Casper R Gøtzsche
- Laboratory of Neural Plasticity, Department of Neuroscience and Pharmacology, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Cláudia Cavadas
- CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal
| | - Miguel Castelo-Branco
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal
| | - David P D Woldbye
- Laboratory of Neural Plasticity, Department of Neuroscience and Pharmacology, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Serge Picaud
- Sorbonne Universités, UPMC Univ Paris 06, Institut de la Vision, UMR_S968, 75012 Paris, France
| | - Ana R Santiago
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal AIBILI, 3000-548 Coimbra, Portugal Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - António F Ambrósio
- Institute for Biomedical Imaging and Life Sciences (IBILI), Faculty of Medicine, University of Coimbra, 3004-548 Coimbra, Portugal CNC.IBILI, University of Coimbra, 3004-548 Coimbra, Portugal AIBILI, 3000-548 Coimbra, Portugal Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| |
Collapse
|
24
|
Evidence suggesting phosphodiesterase-3B regulation of NPY/AgRP gene expression in mHypoE-46 hypothalamic neurons. Neurosci Lett 2015; 604:113-8. [PMID: 26254161 DOI: 10.1016/j.neulet.2015.08.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Revised: 07/21/2015] [Accepted: 08/03/2015] [Indexed: 01/03/2023]
Abstract
Hypothalamic neurons expressing neuropeptide Y (NPY) and agouti related-protein (AgRP) are critical regulators of feeding behavior and body weight, and transduce the action of many peripheral signals including leptin and insulin. However, intracellular signaling molecules involved in regulating NPY/AgRP neuronal activity are incompletely understood. Since phosphodiesterase-3B (PDE3B) mediates the hypothalamic action of leptin and insulin on feeding, and is expressed in NPY/AgRP neurons, PDE3B could play a significant role in regulating NPY/AgRP neuronal activity. To investigate the direct regulation of NPY/AgRP neuronal activity by PDE3B, we examined the effects of gain-of-function or reduced function of PDE3B on NPY/AgRP gene expression in a clonal hypothalamic neuronal cell line, mHypoE-46, which endogenously express NPY, AgRP and PDE3B. Overexpression of PDE3B in mHypoE-46 cells with transfection of pcDNA-3.1-PDE3B expression plasmid significantly decreased NPY and AgRP mRNA levels and p-CREB levels as compared to the control plasmid. For the PDE3B knockdown study, mHypoE-46 cells transfected with lentiviral PDE3BshRNAmir plasmid or non-silencing lentiviral shRNAmir control plasmid were selected with puromycin, and stably transfected cells were grown in culture for 48h. Results showed that PDE3BshRNAmir mediated knockdown of PDE3B mRNA and protein levels (∼60-70%) caused an increase in both NPY and AgRP gene expression and in p-CREB levels. Together, these results demonstrate a reciprocal change in NPY and AgRP gene expression following overexpression and knockdown of PDE3B, and suggest a significant role for PDE3B in the regulation of NPY/AgRP gene expression in mHypoE-46 hypothalamic neurons.
Collapse
|
25
|
Duarte-Neves J, Gonçalves N, Cunha-Santos J, Simões AT, den Dunnen WF, Hirai H, Kügler S, Cavadas C, Pereira de Almeida L. Neuropeptide Y mitigates neuropathology and motor deficits in mouse models of Machado–Joseph disease. Hum Mol Genet 2015. [DOI: 10.1093/hmg/ddv271] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
|
26
|
Affiliation(s)
- T. A. Lutz
- Institute of Veterinary Physiology; University of Zurich; Zurich Switzerland
- Institute of Laboratory Animal Science; University of Zurich; Zurich Switzerland
- Zurich Center of Integrative Human Physiology; University of Zurich; Zurich Switzerland
| |
Collapse
|
27
|
Vähätalo LH, Ruohonen ST, Mäkelä S, Kovalainen M, Huotari A, Mäkelä KA, Määttä JA, Miinalainen I, Gilsbach R, Hein L, Ailanen L, Mattila M, Eerola K, Röyttä M, Ruohonen S, Herzig KH, Savontaus E. Neuropeptide Y in the noradrenergic neurones induces obesity and inhibits sympathetic tone in mice. Acta Physiol (Oxf) 2015; 213:902-19. [PMID: 25482272 DOI: 10.1111/apha.12436] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 11/21/2014] [Accepted: 11/30/2014] [Indexed: 12/21/2022]
Abstract
AIM Neuropeptide Y (NPY) co-localized with noradrenaline in central and sympathetic nervous systems seems to play a role in the control of energy metabolism. In this study, the aim was to elucidate the effects and pathophysiological mechanisms of increased NPY in catecholaminergic neurones on accumulation of body adiposity. METHODS Transgenic mice overexpressing NPY under the dopamine-beta-hydroxylase promoter (OE-NPY(DβH) ) and wild-type control mice were followed for body weight gain and body fat content. Food intake, energy expenditure, physical activity, body temperature, serum lipid content and markers of glucose homoeostasis were monitored. Thermogenic and lipolytic responses in adipose tissues, and urine catecholamine and tissue catecholamine synthesizing enzyme levels were analysed as indices of sympathetic tone. RESULTS Homozygous OE-NPY(DβH) mice showed significant obesity accompanied with impaired glucose tolerance and insulin resistance. Increased adiposity was explained by neither increased food intake or fat absorption nor by decreased total energy expenditure or physical activity. Adipocyte hypertrophy and decreased circulating lipid levels suggested decreased lipolysis and increased lipid uptake. Brown adipose tissue thermogenic capacity was decreased and brown adipocytes filled with lipids. Enhanced response to adrenergic stimuli, downregulation of catecholamine synthesizing enzyme expressions in the brainstem and lower adrenaline excretion supported the notion of low basal catecholaminergic activity. CONCLUSION Increased NPY in catecholaminergic neurones induces obesity that seems to be a result of preferential fat storage. These results support the role of NPY as a direct effector in peripheral tissues and an inhibitor of sympathetic activity in the pathogenesis of obesity.
Collapse
Affiliation(s)
- L. H. Vähätalo
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Drug Research Doctoral Program; University of Turku; Turku Finland
- Turku Center for Disease Modeling; University of Turku; Turku Finland
| | - S. T. Ruohonen
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Turku Center for Disease Modeling; University of Turku; Turku Finland
| | - S. Mäkelä
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Turku Center for Disease Modeling; University of Turku; Turku Finland
| | - M. Kovalainen
- Faculty of Health Sciences; School of Pharmacy; Pharmaceutical Technology; University of Eastern Finland; Kuopio Finland
- Institute of Biomedicine and Biocenter of Oulu; University of Oulu; Oulu Finland
| | - A. Huotari
- Faculty of Health Sciences; School of Pharmacy; Pharmaceutical Technology; University of Eastern Finland; Kuopio Finland
- Institute of Biomedicine and Biocenter of Oulu; University of Oulu; Oulu Finland
| | - K. A. Mäkelä
- Institute of Biomedicine and Biocenter of Oulu; University of Oulu; Oulu Finland
| | - J. A. Määttä
- Turku Center for Disease Modeling; University of Turku; Turku Finland
- Department of Cell Biology and Anatomy; Institute of Biomedicine; University of Turku; Turku Finland
| | - I. Miinalainen
- Biocenter Oulu Electron Microscopy Core Facility; University of Oulu; Oulu Finland
| | - R. Gilsbach
- Institute of Experimental and Clinical Pharmacology and Toxicology and BIOSS Centre for Biological Signalling Studies; University of Freiburg; Freiburg Germany
| | - L. Hein
- Institute of Experimental and Clinical Pharmacology and Toxicology and BIOSS Centre for Biological Signalling Studies; University of Freiburg; Freiburg Germany
| | - L. Ailanen
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Drug Research Doctoral Program; University of Turku; Turku Finland
- Turku Center for Disease Modeling; University of Turku; Turku Finland
| | - M. Mattila
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Drug Research Doctoral Program; University of Turku; Turku Finland
- Turku Center for Disease Modeling; University of Turku; Turku Finland
| | - K. Eerola
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Turku Center for Disease Modeling; University of Turku; Turku Finland
| | - M. Röyttä
- Department of Pathology; University of Turku; Turku Finland
| | - S. Ruohonen
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Research Centre of Applied and Preventive Cardiovascular Medicine; University of Turku; Turku Finland
| | - K. -H. Herzig
- Institute of Biomedicine and Biocenter of Oulu; University of Oulu; Oulu Finland
- Medical Research Center Oulu and Oulu University Hospital; Oulu Finland
| | - E. Savontaus
- Department of Pharmacology, Drug Development and Therapeutics; University of Turku; Turku Finland
- Turku Center for Disease Modeling; University of Turku; Turku Finland
- Unit of Clinical Pharmacology; Turku University Hospital; Turku Finland
| |
Collapse
|
28
|
Neuropeptide Y stimulates autophagy in hypothalamic neurons. Proc Natl Acad Sci U S A 2015; 112:E1642-51. [PMID: 25775546 DOI: 10.1073/pnas.1416609112] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Aging is characterized by autophagy impairment that contributes to age-related disease aggravation. Moreover, it was described that the hypothalamus is a critical brain area for whole-body aging development and has impact on lifespan. Neuropeptide Y (NPY) is one of the major neuropeptides present in the hypothalamus, and it has been shown that, in aged animals, the hypothalamic NPY levels decrease. Because caloric restriction (CR) delays aging, at least in part, by stimulating autophagy, and also increases hypothalamic NPY levels, we hypothesized that NPY could have a relevant role on autophagy modulation in the hypothalamus. Therefore, the aim of this study was to investigate the role of NPY on autophagy in the hypothalamus. Using both hypothalamic neuronal in vitro models and mice overexpressing NPY in the hypothalamus, we observed that NPY stimulates autophagy in the hypothalamus. Mechanistically, in rodent hypothalamic neurons, NPY increases autophagy through the activation of NPY Y1 and Y5 receptors, and this effect is tightly associated with the concerted activation of PI3K, MEK/ERK, and PKA signaling pathways. Modulation of hypothalamic NPY levels may be considered a potential strategy to produce protective effects against hypothalamic impairments associated with age and to delay aging.
Collapse
|
29
|
Kawasaki T, Ohta M, Kawano Y, Masuda T, Gotoh K, Inomata M, Kitano S. Effects of sleeve gastrectomy and gastric banding on the hypothalamic feeding center in an obese rat model. Surg Today 2015; 45:1560-6. [PMID: 25724939 DOI: 10.1007/s00595-015-1135-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 01/27/2015] [Indexed: 12/19/2022]
Abstract
PURPOSE Laparoscopic sleeve gastrectomy (SG) and gastric banding (GB) are popular bariatric procedures for treating morbid obesity. This study aimed to investigate changes in the hypothalamic feeding center after these surgeries in a diet-induced obese rat model. METHODS Obesity was induced in 60 Sprague-Dawley rats using a high-energy diet for 6 weeks. These rats were divided into four groups: the sham-operated (SO) control, pair-fed (PF) control, SG and GB groups. Six weeks after the surgery, metabolic parameters, the plasma levels of leptin, ghrelin, peptide YY (PYY) and glucagon-like peptide-1 (GLP-1) and the hypothalamic mRNA expressions of neuropeptide Y (NPY) and pro-opiomelanocortin (POMC) were measured. RESULTS Compared with those observed in the SO group, the body and fat tissue weights were significantly decreased and the metabolic parameters were significantly improved in the PF, SG and GB groups 6 weeks after surgery. The plasma ghrelin levels were significantly lower and the PYY and GLP-1 levels were significantly higher in the SG group than in the PF, GB and SO groups. Compared with that seen in the PF and GB groups, the hypothalamic mRNA expression of NPY was significantly lower and the expression of POMC was significantly higher in the SG group. CONCLUSIONS SG may affect the neurological pathway associated with appetite in the hypothalamus and thereby control ingestive behavior.
Collapse
Affiliation(s)
- Takahide Kawasaki
- Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita, 879-5593, Japan.
| | - Masayuki Ohta
- Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita, 879-5593, Japan
| | - Yuichiro Kawano
- Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita, 879-5593, Japan
| | - Takashi Masuda
- Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita, 879-5593, Japan
| | - Koro Gotoh
- Department of Endocrinology, Metabolism, and Rheumatology, Oita University Faculty of Medicine, Oita, Japan
| | - Masafumi Inomata
- Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, 1-1 Idaigaoka, Hasama-machi, Yufu, Oita, 879-5593, Japan
| | | |
Collapse
|
30
|
Abstract
The role of neuronal noncoding RNAs in energy control of the body is not fully understood. The arcuate nucleus (ARC) of the hypothalamus comprises neurons regulating food intake and body weight. Here we show that Dicer-dependent loss of microRNAs in these neurons of adult (DicerCKO) mice causes chronic overactivation of the signaling pathways involving phosphatidylinositol-3-kinase (PI3K), Akt, and mammalian target of rapamycin (mTOR) and an imbalance in the levels of neuropeptides, resulting in severe hyperphagic obesity. Similarly, the activation of PI3K-Akt-mTOR pathway due to Pten deletion in the adult forebrain leads to comparable weight increase. Conversely, the mTORC1 inhibitor rapamycin normalizes obesity in mice with an inactivated Dicer1 or Pten gene. Importantly, the continuous delivery of oligonucleotides mimicking microRNAs, which are predicted to target PI3K-Akt-mTOR pathway components, to the hypothalamus attenuates adiposity in DicerCKO mice. Furthermore, loss of miR-103 causes strong upregulation of the PI3K-Akt-mTOR pathway in vitro and its application into the ARC of the Dicer-deficient mice both reverses upregulation of Pik3cg, the mRNA encoding the catalytic subunit p110γ of the PI3K complex, and attenuates the hyperphagic obesity. Our data demonstrate in vivo the crucial role of neuronal microRNAs in the control of energy homeostasis.
Collapse
|
31
|
Kocalis HE, Hagan SL, George L, Turney MK, Siuta MA, Laryea GN, Morris LC, Muglia LJ, Printz RL, Stanwood GD, Niswender KD. Rictor/mTORC2 facilitates central regulation of energy and glucose homeostasis. Mol Metab 2014; 3:394-407. [PMID: 24944899 PMCID: PMC4060224 DOI: 10.1016/j.molmet.2014.01.014] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 01/24/2014] [Accepted: 01/29/2014] [Indexed: 01/15/2023] Open
Abstract
Insulin signaling in the central nervous system (CNS) regulates energy balance and peripheral glucose homeostasis. Rictor is a key regulatory/structural subunit of the mTORC2 complex and is required for hydrophobic motif site phosphorylation of Akt at serine 473. To examine the contribution of neuronal Rictor/mTORC2 signaling to CNS regulation of energy and glucose homeostasis, we utilized Cre-LoxP technology to generate mice lacking Rictor in all neurons, or in either POMC or AgRP expressing neurons. Rictor deletion in all neurons led to increased fat mass and adiposity, glucose intolerance and behavioral leptin resistance. Disrupting Rictor in POMC neurons also caused obesity and hyperphagia, fasting hyperglycemia and pronounced glucose intolerance. AgRP neuron specific deletion did not impact energy balance but led to mild glucose intolerance. Collectively, we show that Rictor/mTORC2 signaling, especially in POMC-expressing neurons, is important for central regulation of energy and glucose homeostasis.
Collapse
Affiliation(s)
- Heidi E. Kocalis
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Scott L. Hagan
- Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Leena George
- Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Maxine K. Turney
- Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Michael A. Siuta
- Neuroscience Graduate Program, Vanderbilt University, Nashville, TN, United States
- Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Gloria N. Laryea
- Neuroscience Graduate Program, Vanderbilt University, Nashville, TN, United States
| | - Lindsey C. Morris
- Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Louis J. Muglia
- Center for Prevention of Preterm Birth, Cincinnati Children’s Hospital Medical Center, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, United States
| | - Richard L. Printz
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Gregg D. Stanwood
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN, United States
| | - Kevin D. Niswender
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, TN, United States
- Department of Veterans Affairs Tennessee Valley Healthcare System, Nashville, TN, United States
- Division of Diabetes, Endocrinology and Metabolism, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN, United States
- Corresponding author. 7435G MRB IV, Vanderbilt Medical Center, Nashville, TN 37232, United States. Tel.: +1 615 936 0500.
| |
Collapse
|
32
|
Khan AM. Controlling feeding behavior by chemical or gene-directed targeting in the brain: what's so spatial about our methods? Front Neurosci 2013; 7:182. [PMID: 24385950 PMCID: PMC3866545 DOI: 10.3389/fnins.2013.00182] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 09/20/2013] [Indexed: 12/26/2022] Open
Abstract
Intracranial chemical injection (ICI) methods have been used to identify the locations in the brain where feeding behavior can be controlled acutely. Scientists conducting ICI studies often document their injection site locations, thereby leaving kernels of valuable location data for others to use to further characterize feeding control circuits. Unfortunately, this rich dataset has not yet been formally contextualized with other published neuroanatomical data. In particular, axonal tracing studies have delineated several neural circuits originating in the same areas where ICI injection feeding-control sites have been documented, but it remains unclear whether these circuits participate in feeding control. Comparing injection sites with other types of location data would require careful anatomical registration between the datasets. Here, a conceptual framework is presented for how such anatomical registration efforts can be performed. For example, by using a simple atlas alignment tool, a hypothalamic locus sensitive to the orexigenic effects of neuropeptide Y (NPY) can be aligned accurately with the locations of neurons labeled by anterograde tracers or those known to express NPY receptors or feeding-related peptides. This approach can also be applied to those intracranial "gene-directed" injection (IGI) methods (e.g., site-specific recombinase methods, RNA expression or interference, optogenetics, and pharmacosynthetics) that involve viral injections to targeted neuronal populations. Spatial alignment efforts can be accelerated if location data from ICI/IGI methods are mapped to stereotaxic brain atlases to allow powerful neuroinformatics tools to overlay different types of data in the same reference space. Atlas-based mapping will be critical for community-based sharing of location data for feeding control circuits, and will accelerate our understanding of structure-function relationships in the brain for mammalian models of obesity and metabolic disorders.
Collapse
Affiliation(s)
- Arshad M. Khan
- UTEP Systems Neuroscience Laboratory, Department of Biological Sciences, Border Biomedical Research Center, University of Texas at El PasoEl Paso, TX, USA
- Neurobiology Section, Department of Biological Sciences, University of Southern CaliforniaLos Angeles, CA, USA
| |
Collapse
|
33
|
Zhang W, Sumners LH, Siegel PB, Cline MA, Gilbert ER. Quantity of glucose transporter and appetite-associated factor mRNA in various tissues after insulin injection in chickens selected for low or high body weight. Physiol Genomics 2013; 45:1084-94. [DOI: 10.1152/physiolgenomics.00102.2013] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Chickens from lines selected for low (LWS) or high (HWS) body weight differ by 10-fold in body weight at 56 days old with differences in food intake, glucose regulation, and body composition. To evaluate if there are differences in appetite-regulatory factor and glucose transporter ( GLUT) mRNA that are accentuated by hypoglycemia, blood glucose was measured, and hypothalamus, liver, pectoralis major, and abdominal fat collected at 90 days of age from female HWS and LWS chickens, and reciprocal crosses, HL and LH, at 60 min after intraperitoneal injection of insulin. Neuropeptide Y ( NPY) and receptor ( NPYR) subtypes 1 and 5 mRNA were greater in LWS compared with HWS hypothalamus ( P < 0.05), but greater in HWS than LWS in fat ( P < 0.05). Expression of NPYR2 was greater in LWS than HWS in pectoralis major ( P < 0.05). There was greater expression in HWS than LWS for GLUT1 in hypothalamus and liver ( P < 0.05), GLUT2 in fat and liver ( P < 0.05), and GLUT9 in liver ( P < 0.05). Insulin was associated with reduced blood glucose in all populations ( P < 0.05) and reduced mRNA of insulin receptor ( IR) and GLUT 2 and 3 in liver ( P < 0.05). There was heterosis for mRNA, most notably NPYR1 (−78%) and NPYR5 (−81%) in fat and GLUT2 (−70%) in liver. Results suggest that NPY and GLUTs are associated with differences in energy homeostasis in LWS and HWS. Reduced GLUT and IR mRNA after insulin injection suggest a compensatory mechanism to prevent further hypoglycemia.
Collapse
Affiliation(s)
- Wei Zhang
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, Virginia
| | - Lindsay H. Sumners
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, Virginia
| | - Paul B. Siegel
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, Virginia
| | - Mark A. Cline
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, Virginia
| | | |
Collapse
|
34
|
Badshah H, Ullah I, Kim SE, Kim TH, Lee HY, Kim MO. Anthocyanins attenuate body weight gain via modulating neuropeptide Y and GABAB1 receptor in rats hypothalamus. Neuropeptides 2013; 47:347-53. [PMID: 23830691 DOI: 10.1016/j.npep.2013.06.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 05/10/2013] [Accepted: 06/03/2013] [Indexed: 02/05/2023]
Abstract
Anthocyanins in a variety of plant species have been identified and are known for its hypolipidemic and anti-obesity effects. The effect of anthocyanins extracted from black soybean on body weight and daily food intake in adult rats raised on normal diet were studied. Male Sprague-Dawley rats were daily intra-gastric administered water or anthocyanins 6 mg/kg and 24 mg/kg for 40 days. During this period daily food intake and body weight were measured prior to anthocyanins treatment. These findings showed that anthocyanins treatment resulted in significantly lowered body weight and food intake compared with water treated rats. In addition, anthocyanins dose dependently reduced the adipose tissue size compared with control group. Western blot analysis showed that high dose of anthocyanins treatment significantly reduced the expression of neuropeptide Y (NPY) and increased γ-amino butyric acid receptor (GABAB1R) in hypothalamus. Furthermore, these events were followed by a decreased in expression of GABAB1R downstream signaling molecules protein kinase A-α (PKA) and phosphorylated cAMP-response element binding protein (p-CREB) in hypothalamus. These data support the concept that anthocyanins even in normal circumstances have the capability to reduce body weight and food intake through its modulatory effect on NPY and GABAB1R in hypothalamus. These results suggest that anthocyanins from black soybean seed coat might have a novel role in preventing obesity in rats on normal diet.
Collapse
Affiliation(s)
- Haroon Badshah
- Department of Biology, College of Natural Sciences (RINS), Gyeongsang National University, Jinju 660-701, Republic of Korea
| | | | | | | | | | | |
Collapse
|
35
|
DeMorrow S, Meng F, Venter J, Leyva-Illades D, Francis H, Frampton G, Pae HY, Quinn M, Onori P, Glaser S, McDaniel K, Mancinelli R, Gaudio E, Alpini G, Franchitto A. Neuropeptide Y inhibits biliary hyperplasia of cholestatic rats by paracrine and autocrine mechanisms. Am J Physiol Gastrointest Liver Physiol 2013; 305:G250-7. [PMID: 23703654 PMCID: PMC3742859 DOI: 10.1152/ajpgi.00140.2013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Neuropeptide Y (NPY) exerts its functions through six subtypes of receptors (Y₁-Y₆). Biliary homeostasis is regulated by several factors through autocrine/paracrine signaling. NPY inhibits cholangiocarcinoma growth; however, no information exists regarding the autocrine/paracrine role of NPY on biliary hyperplasia during cholestasis. The aims of this study were to determine: 1) the expression of NPY and Y₁-Y₅ in cholangiocytes and 2) the paracrine/autocrine effects of NPY on cholangiocyte proliferation. Normal or bile duct ligation (BDL) rats were treated with NPY, neutralizing anti-NPY antibody, or vehicle for 7 days. NPY and NPY receptor (NPYR) expression was assessed in liver sections and isolated cholangiocytes. NPY secretion was assessed in serum and bile from normal and BDL rats, as well as supernatants from normal and BDL cholangiocytes and normal rat cholangiocyte cell line [intrahepatic normal cholangiocyte culture (NRICC)]. We evaluated intrahepatic bile ductal mass (IBDM) in liver sections and proliferation in cholangiocytes. With the use of NRICC, the effects of NPY or anti-NPY antibody on cholangiocyte proliferation were determined. The expression of NPY and all NPYR were increased after BDL. NPY levels were lower in serum and cholangiocyte supernatant from BDL compared with normal rats. NPY secretion from NRICC was detected at both the basolateral and apical domains. Chronic NPY treatment decreased proliferating cellular nuclear antigen (PCNA) expression and IBDM in BDL rats. Administration of anti-NPY antibody to BDL rats increased cholangiocyte proliferation and IBDM. NPY treatment of NRICC decreased PCNA expression and increased the cell cycle arrest, whereas treatment with anti-NPY antibody increased proliferation. Therapies targeting NPY-mediated signaling may prove beneficial for the treatment of cholangiopathies.
Collapse
Affiliation(s)
- Sharon DeMorrow
- 1Research, Central Texas Veterans Health Care System, Temple, Texas; ,2Scott & White Digestive Disease Research Center, Scott & White, Temple, Texas; ,4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Fanyin Meng
- 1Research, Central Texas Veterans Health Care System, Temple, Texas; ,2Scott & White Digestive Disease Research Center, Scott & White, Temple, Texas; ,3Division of Research and Education, Scott & White, Temple, Texas; ,4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Julie Venter
- 4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Dinorah Leyva-Illades
- 4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Heather Francis
- 1Research, Central Texas Veterans Health Care System, Temple, Texas; ,2Scott & White Digestive Disease Research Center, Scott & White, Temple, Texas; ,3Division of Research and Education, Scott & White, Temple, Texas; ,4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Gabriel Frampton
- 4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Hae Yong Pae
- 4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Matthew Quinn
- 4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Paolo Onori
- 5Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, “La Sapienza,” Rome, Italy; and
| | - Shannon Glaser
- 1Research, Central Texas Veterans Health Care System, Temple, Texas; ,2Scott & White Digestive Disease Research Center, Scott & White, Temple, Texas; ,3Division of Research and Education, Scott & White, Temple, Texas; ,4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Kelly McDaniel
- 3Division of Research and Education, Scott & White, Temple, Texas;
| | - Romina Mancinelli
- 5Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, “La Sapienza,” Rome, Italy; and
| | - Eugenio Gaudio
- 5Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, “La Sapienza,” Rome, Italy; and
| | - Gianfranco Alpini
- 1Research, Central Texas Veterans Health Care System, Temple, Texas; ,2Scott & White Digestive Disease Research Center, Scott & White, Temple, Texas; ,4Department of Medicine, Division Gastroenterology, Texas A&M Health Science Center, College of Medicine, Temple, Texas;
| | - Antonio Franchitto
- 5Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, “La Sapienza,” Rome, Italy; and ,6Eleonora Lorillard Spencer-Cenci Foundation, Rome, Italy
| |
Collapse
|
36
|
Cyr NE, Toorie AM, Steger JS, Sochat MM, Hyner S, Perello M, Stuart R, Nillni EA. Mechanisms by which the orexigen NPY regulates anorexigenic α-MSH and TRH. Am J Physiol Endocrinol Metab 2013; 304:E640-50. [PMID: 23321476 PMCID: PMC3602689 DOI: 10.1152/ajpendo.00448.2012] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 01/12/2013] [Indexed: 01/24/2023]
Abstract
Protein posttranslational processing is a cellular mechanism fundamental to the generation of bioactive peptides, including the anorectic α-melanocyte-stimulating hormone (α-MSH) and thyrotropin-releasing hormone (TRH) peptides produced in the hypothalamic arcuate (ARC) and paraventricular (PVN) nuclei, respectively. Neuropeptide Y (NPY) promotes positive energy balance in part by suppressing α-MSH and TRH. The mechanism by which NPY regulates α-MSH output, however, is not well understood. Our results reveal that NPY inhibited the posttranslational processing of α-MSH's inactive precursor proopiomelanocortin (POMC) by decreasing the prohormone convertase-2 (PC2). We also found that early growth response protein-1 (Egr-1) and NPY-Y1 receptors mediated the NPY-induced decrease in PC2. NPY given intra-PVN also decreased PC2 in PVN samples, suggesting a reduction in PC2-mediated pro-TRH processing. In addition, NPY attenuated the α-MSH-induced increase in TRH production by two mechanisms. First, NPY decreased α-MSH-induced CREB phosphorylation, which normally enhances TRH transcription. Second, NPY decreased the amount of α-MSH in the PVN. Collectively, these results underscore the significance of the interaction between NPY and α-MSH in the central regulation of energy balance and indicate that posttranslational processing is a mechanism that plays a specific role in this interaction.
Collapse
Affiliation(s)
- Nicole E Cyr
- Division of Endocrinology, Department of Medicine, The Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI 02903, USA
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Intermittent fasting dietary restriction regimen negatively influences reproduction in young rats: a study of hypothalamo-hypophysial-gonadal axis. PLoS One 2013; 8:e52416. [PMID: 23382817 PMCID: PMC3558496 DOI: 10.1371/journal.pone.0052416] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Accepted: 11/16/2012] [Indexed: 11/19/2022] Open
Abstract
Nutritional infertility is very common in societies where women fail to eat enough to match their energy expenditure and such females often present as clinical cases of anorexia nervosa. The cellular and molecular mechanisms that link energy balance and central regulation of reproduction are still not well understood. Peripheral hormones such as estradiol, testosterone and leptin, as well as neuropeptides like kisspeptin and neuropeptides Y (NPY) play a potential role in regulation of reproduction and energy balance with their primary target converging on the hypothalamic median eminence-arcuate region. The present study was aimed to explore the effects of negative energy state resulting from intermittent fasting dietary restriction (IF-DR) regimen on complete hypothalamo-hypophysial-gonadal axis in Wistar strain young female and male rats. Significant changes in body weight, blood glucose, estrous cyclicity and serum estradiol, testosterone and LH level indicated the negative role of IF-DR regimen on reproduction in these young animals. Further, it was elucidated whether serum level of metabolic hormone, leptin plays a mechanistic role in suppressing hypothalamo-hypophysial-gonadal (HPG) axis via energy regulators, kisspeptin and NPY in rats on IF-DR regimen. We also studied the effect of IF-DR regimen on structural remodeling of GnRH axon terminals in median eminence region of hypothalamus along with the glial cell marker, GFAP and neuronal plasticity marker, PSA-NCAM using immunostaining, Western blotting and RT-PCR. Together these data suggest that IF-DR regimen negatively influences reproduction in young animals due to its adverse effects on complete hypothalamus-hypophysial-gonadal axis and may explain underlying mechanism(s) to understand the clinical basis of nutritional infertility.
Collapse
|
38
|
Abstract
Leptin is synthesized and released by the adipose tissue. Leptin, which carries the information about energy reserves of the body to the brain, controls food intake by acting on neuropeptide Y (NPY), which exercises a food-intake-increasing effect through relevant receptors in the hypothalamus. Zinc deficiency is claimed to result in anorexia, weight loss, poor food efficiency, and growth impairment. The fact that obese individuals have low zinc and high leptin levels suggests that there is a relation between zinc and nutrition, and consequently also between zinc and leptin. Leptin deficiency increases the predisposition to infections and this increase is associated with the impairments in the production of cytokines. Zinc has a key role in the sustenance of immune resistance against infections. Dietary zinc deficiency negatively affects CD(+) 4 cells, Th functions, and consequently, cell-mediated immunity by causing a decrease in the production of IL-2, IF-γ, and TNF-α, which are Th1 products. The relation between zinc and the concerned cytokines in particular, and the fact that leptin has a part in the immune responses mediated by these cytokines demonstrate that an interaction among cellular immunity, leptin and zinc is inevitable. An overall evaluation of the information presented above suggests that there are complex relations among food intake, leptin and zinc on one hand and among cellular immunity, leptin and zinc on the other. The aim of the present review was to draw attention to the possible relation between zinc and leptin in dietary regulation and cellular immunity.
Collapse
Affiliation(s)
| | - Rasim Mogulkoc
- Department of Physiology, Selcuklu Medical School, Selcuk University, Konya, Turkey
| |
Collapse
|
39
|
Zengin A, Nguyen AD, Wong IPL, Zhang L, Enriquez RF, Eisman JA, Herzog H, Baldock PA, Sainsbury A. Neuropeptide Y mediates the short-term hypometabolic effect of estrogen deficiency in mice. Int J Obes (Lond) 2012; 37:390-8. [PMID: 22565420 DOI: 10.1038/ijo.2012.71] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND Estrogen deficiency increases body weight or total and central adiposity and decreases energy expenditure. Hypothalamic neuropeptide Y (NPY) expression is altered by estrogen deficiency in rodents, but the long-term consequences on energy homeostasis are unknown. OBJECTIVE To investigate the role of NPY in the changes in energy expenditure and physical activity, as well as the associated changes in body weight and composition in response to short-term and long-term estrogen deficiency. DESIGN Sham and ovariectomy (OVX) operations were performed at 8 weeks of age in wild-type (WT) and NPY(-/-) mice. Energy expenditure, physical activity, body composition and weight, as well as food intake were measured at 10-18 days (short-term) and 46-54 days (long-term) after OVX. RESULTS OVX influences energy homeostasis differently at early compared with later time-points. At the early but not the late time point, OVX in WT mice reduced oxygen consumption and energy expenditure and tended to reduce resting metabolic rate. Interestingly, these effects of short-term estrogen deficiency were ablated by NPY deletion, with NPY(-/-) mice exhibiting significant increases in energy expenditure and resting metabolic rate. In addition to these hypermetabolic effects, OVX NPY(-/-) mice exhibited significantly lower body weight and whole-body fat mass relative to OVX WT controls at the short-term but not the long-term time point. Food intake and physical activity were unaltered by OVX, but NPY(-/-) mice exhibited significant reductions in these parameters relative to WT. CONCLUSION The effects of estrogen deficiency to reduce energy metabolism are transient, and NPY is critical to this effect as well as the early OVX-induced obesity.
Collapse
Affiliation(s)
- A Zengin
- Osteoporosis and Bone Biology, Garvan Institute of Medical Research, St Vincent's Hospital, Sydney, New South Wales, Australia
| | | | | | | | | | | | | | | | | |
Collapse
|