Journal article
Central ceramide-induced hypothalamic lipotoxicity and ER stress regulate energy balance
Cell reports (Cambridge), Vol.9(1), pp.366-377
10/09/2014
DOI: 10.1016/j.celrep.2014.08.057
PMCID: PMC5157160
PMID: 25284795
Abstract
Hypothalamic endoplasmic reticulum (ER) stress is a key mechanism leading to obesity. Here, we demonstrate that ceramides induce lipotoxicity and hypothalamic ER stress, leading to sympathetic inhibition, reduced brown adipose tissue (BAT) thermogenesis, and weight gain. Genetic overexpression of the chaperone GRP78/BiP (glucose-regulated protein 78 kDa/binding immunoglobulin protein) in the ventromedial nucleus of the hypothalamus (VMH) abolishes ceramide action by reducing hypothalamic ER stress and increasing BAT thermogenesis, which leads to weight loss and improved glucose homeostasis. The pathophysiological relevance of this mechanism is demonstrated in obese Zucker rats, which show increased hypothalamic ceramide levels and ER stress. Overexpression of GRP78 in the VMH of these animals reduced body weight by increasing BAT thermogenesis as well as decreasing leptin and insulin resistance and hepatic steatosis. Overall, these data identify a triangulated signaling network involving central ceramides, hypothalamic lipotoxicity/ER stress, and BAT thermogenesis as a pathophysiological mechanism of obesity.
Details
- Title: Subtitle
- Central ceramide-induced hypothalamic lipotoxicity and ER stress regulate energy balance
- Creators
- Cristina Contreras - Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, SpainIsmael González-García - Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, SpainNoelia Martínez-Sánchez - Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, SpainPatricia Seoane-Collazo - Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, SpainJordi Jacas - CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, Spain; Basic Sciences Department, Faculty of Medicine and Health Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallés, 08195 Barcelona, SpainDonald A Morgan - Department of Pharmacology, University of Iowa, Iowa City, IA 52242, USADolors Serra - CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, Spain; Department of Biochemistry and Molecular Biology, School of Pharmacy, Institut de Biomedicina (IBUB), Universitat de Barcelona, 08028 Barcelona, SpainRosalía Gallego - Department of Morphological Sciences, School of Medicine, University of Santiago de Compostela, 15782 Santiago de Compostela, SpainFrancisco Gonzalez - Department of Surgery, CIMUS, University of Santiago de Compostela-Instituto de Invesstiagacion Sanitaria, 15782 Santiago de Compostela, Spain; Service of Ophthalmology, Complejo Hospitalario Universitario de Santiago de Compostela, 15706 Santiago de Compostela, SpainNúria Casals - CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, Spain; Basic Sciences Department, Faculty of Medicine and Health Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallés, 08195 Barcelona, SpainRubén Nogueiras - Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, SpainKamal Rahmouni - Department of Pharmacology, University of Iowa, Iowa City, IA 52242, USA; Department of Internal Medicine, University of Iowa, Iowa City, IA 52242, USACarlos Diéguez - Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, SpainMiguel López - Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, 15782 Santiago de Compostela, Spain; CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), 15706 Santiago de Compostela, Spain. Electronic address: m.lopez@usc.es
- Resource Type
- Journal article
- Publication Details
- Cell reports (Cambridge), Vol.9(1), pp.366-377
- Publisher
- United States
- DOI
- 10.1016/j.celrep.2014.08.057
- PMID
- 25284795
- PMCID
- PMC5157160
- ISSN
- 2211-1247
- eISSN
- 2211-1247
- Grant note
- HL084207 / NHLBI NIH HHS P01 HL084207 / NHLBI NIH HHS
- Language
- English
- Date published
- 10/09/2014
- Academic Unit
- Iowa Neuroscience Institute; Neuroscience and Pharmacology; Internal Medicine
- Record Identifier
- 9984040281202771
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