An uncoupling protein homologue putatively involved in facultative muscle thermogenesis in birds

Author:

RAIMBAULT Serge1,DRIDI Sami2,DENJEAN Frédérique3,LACHUER Joël3,COUPLAN Elodie1,BOUILLAUD Frédéric1,BORDAS André4,DUCHAMP Claude3,TAOUIS Mohamed2,RICQUIER Daniel1

Affiliation:

1. Centre de Recherches sur l'Endocrinologie Moléculaire et le Développement, CNRS, 9 rue Jules Hetzel, F-92190 Meudon, France

2. Station de Recherches Avicoles, INRA Tours, 3738 Nouzilly, France

3. Laboratoire de Physiologie des Régulations Energétiques, Cellulaires et Moléculaires, CNRS, 43 Bld 11 Novembre 1918, F-69622, Villeurbanne Cédex, France

4. Unité de Génétique factorielle, INRA, 78352 Jouy-en-Josas, France

Abstract

The cDNA of an uncoupling protein (UCP) homologue was obtained by screening a chicken skeletal-muscle library. The predicted 307-amino-acid sequence of avian UCP (avUCP) is 55, 70, 70 and 46% identical with mammalian UCP1, UCP2 and UCP3 and plant UCP respectively. avUCP mRNA expression is restricted to skeletal muscle and its abundance was increased 1.3-fold in a chicken line showing diet-induced thermogenesis, and 3.6- and 2.6-fold in cold-acclimated and glucagon-treated ducklings developing muscle non-shivering thermogenesis respectively. The present data support the implication of avUCP in avian energy expenditure.

Publisher

Portland Press Ltd.

Subject

Cell Biology,Molecular Biology,Biochemistry

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