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3. Small scale net project: technical report

Author

Gonin, M., El Moueddeb, M., Fertane, L., Archambaud, J., Godet, N., Colombani, P. B., Mallo, R. Sande Y., Guillaume Piton, Franck Bourrier, Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Erosion torrentielle neige et avalanches (UR ETGR (ETNA)), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Ecosystèmes montagnards (UR EMGR), Autres, irstea, and ENSE3

Subjects
[SDE]Environmental Sciences
Abstract

Numerical study of scale reduction effect on the mechanical behaviour of steal beam and steal nets in order to respect mechanical similitude in laboratory tests.; Etude numérique de l'effet de réduction d'échelle des ouvrages en métal (poutre acier et filet acier) dans l'objectif de respecter les similitudes mécaniques en laboratoire.

4. Brain glucagon-like peptide 1 signaling controls the onset of high-fat diet-induced insulin resistance and reduces energy expenditure.

Author

Knauf C, Cani PD, Ait-Belgnaoui A, Benani A, Dray C, Cabou C, Colom A, Uldry M, Rastrelli S, Sabatier E, Godet N, Waget A, Pénicaud L, Valet P, and Burcelin R

Subjects
Animals, Blood Glucose metabolism, Body Temperature Regulation drug effects, Body Temperature Regulation physiology, Brain Stem physiology, Carbon Dioxide metabolism, Diabetes Mellitus, Type 2 drug therapy, Energy Metabolism drug effects, Energy Metabolism physiology, Glucose Intolerance drug therapy, Glucose Intolerance metabolism, Hyperinsulinism drug therapy, Hyperinsulinism metabolism, Ion Channels metabolism, Male, Mice, Mice, Inbred C57BL, Mitochondrial Proteins metabolism, Motor Activity drug effects, Motor Activity physiology, Muscle, Skeletal metabolism, Nitric Oxide Synthase Type II genetics, Nitric Oxide Synthase Type III, Oxygen Consumption drug effects, Oxygen Consumption physiology, Peptide Fragments pharmacology, Physical Endurance drug effects, Physical Endurance physiology, Proglucagon genetics, RNA, Messenger metabolism, Signal Transduction drug effects, Uncoupling Protein 2, Diabetes Mellitus, Type 2 metabolism, Dietary Fats pharmacology, Glucagon-Like Peptide 1 metabolism, Insulin Resistance physiology, Signal Transduction physiology
Abstract

Glucagon-like peptide-1 (GLP-1) is a peptide released by the intestine and the brain. We previously demonstrated that brain GLP-1 increases glucose-dependent hyperinsulinemia and insulin resistance. These two features are major characteristics of the onset of type 2 diabetes. Therefore, we investigated whether blocking brain GLP-1 signaling would prevent high-fat diet (HFD)-induced diabetes in the mouse. Our data show that a 1-month chronic blockage of brain GLP-1 signaling by exendin-9 (Ex9), totally prevented hyperinsulinemia and insulin resistance in HFD mice. Furthermore, food intake was dramatically increased, but body weight gain was unchanged, showing that brain GLP-1 controlled energy expenditure. Thermogenesis, glucose utilization, oxygen consumption, carbon dioxide production, muscle glycolytic respiratory index, UCP2 expression in muscle, and basal ambulatory activity were all increased by the exendin-9 treatment. Thus, we have demonstrated that in response to a HFD, brain GLP-1 signaling induces hyperinsulinemia and insulin resistance and decreases energy expenditure by reducing metabolic thermogenesis and ambulatory activity.

Published
2008
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