4E-BP1 and 4E-BP2 double knockout mice are protected from aging-associated sarcopenia - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Journal of Cachexia, Sarcopenia and Muscle Année : 2019

4E-BP1 and 4E-BP2 double knockout mice are protected from aging-associated sarcopenia

Olivier Le Bacquer
Véronique Patrac
  • Fonction : Auteur
  • PersonId : 1204432
Brian Ingram
  • Fonction : Auteur
Lydie Combaret
Dominique Dardevet
Jérôme Salles
Christophe Giraudet
  • Fonction : Auteur
  • PersonId : 1204431
Christelle Guillet
  • Fonction : Auteur
  • PersonId : 1204288
Nahum Sonenberg
Yves Boirie
  • Fonction : Auteur
  • PersonId : 1203914
Stéphane Walrand

Résumé

BACKGROUND: Sarcopenia is the loss of muscle mass/function that occurs during the aging process. The links between mechanistic target of rapamycin (mTOR) activity and muscle development are largely documented, but the role of its downstream targets in the development of sarcopenia is poorly understood. Eukaryotic initiation factor 4E-binding proteins (4E-BPs) are targets of mTOR that repress mRNA translation initiation and are involved in the control of several physiological processes. However, their role in skeletal muscle is still poorly understood. The goal of this study was to assess how loss of 4E-BP1 and 4E-BP2 expression impacts skeletal muscle function and homeostasis in aged mice and to characterize the associated metabolic changes by metabolomic and lipidomic profiling. METHODS: Twenty-four-month-old wild-type and whole body 4E-BP1/4E-BP2 double knockout (DKO) mice were used to measure muscle mass and function. Protein homeostasis was measured ex vivo in extensor digitorum longus by incorporation of l-[U-(14) C]phenylalanine, and metabolomic and lipidomic profiling of skeletal muscle was performed by Metabolon, Inc. RESULTS: The 4E-BP1/2 DKO mice exhibited an increase in muscle mass that was associated with increased grip strength (P < 0.05). Protein synthesis was higher under both basal (+102%, P < 0.05) and stimulated conditions (+65%, P < 0.05) in DKO skeletal muscle. Metabolomic and complex lipid analysis of skeletal muscle revealed robust differences pertaining to amino acid homeostasis, carbohydrate abundance, and certain aspects of lipid metabolism. In particular, levels of most free amino acids were lower within the 4E-BP1/2 DKO muscle. Interestingly, although glucose levels were unchanged, differences were observed in the isobaric compound maltitol/lactitol (33-fold increase, P < 0.01) and in several additional carbohydrate compounds. 4E-BP1/2 depletion also resulted in accumulation of medium-chain acylcarnitines and a 20% lower C2/C0 acylcarnitine ratio (P < 0.01) indicative of reduced beta-oxidation. CONCLUSIONS: Taken together, these findings demonstrate that deletion of 4E-BPs is associated with perturbed energy metabolism in skeletal muscle and could have beneficial effects on skeletal muscle mass and function in aging mice. They also identify 4E-BPs as potential targets for the treatment of sarcopenia.
Fichier principal
Vignette du fichier
J cachexia sarcopenia muscle - 2019 - Le Bacquer.pdf (1.05 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04002062 , version 1 (23-02-2023)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Olivier Le Bacquer, Kristell Combe, Véronique Patrac, Brian Ingram, Lydie Combaret, et al.. 4E-BP1 and 4E-BP2 double knockout mice are protected from aging-associated sarcopenia. Journal of Cachexia, Sarcopenia and Muscle, 2019, 10 (3), pp.696-709. ⟨10.1002/jcsm.12412⟩. ⟨hal-04002062⟩
59 Consultations
74 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More