Phospholipase D regulates myogenic differentiation through the activation of both mTORC1 and mTORC2 complexes.: Phospholipase D and mTOR in myogenesis

Abstract : How phospholipase D (PLD) is involved in myogenesis remains unclear. At the onset of myogenic differentiation of L6 cells induced by the PLD agonist vasopressin in the absence of serum, mTORC1 complex was rapidly activated, as reflected by phosphorylation of S6 kinase1 (S6K1). Both the long (p85) and short (p70) S6K1 isoforms were phosphorylated in a PLD1-dependent way. Short rapamycin treatment specifically inhibiting mTORC1 suppressed p70 but not p85 phosphorylation, suggesting that p85 might be directly activated by phosphatidic acid. Vasopressin stimulation also induced phosphorylation of Akt on Ser-473 through PLD1-dependent activation of mTORC2 complex. In this model of myogenesis, mTORC2 had a positive role mostly unrelated to Akt activation, whereas mTORC1 had a negative role, associated with S6K1-induced Rictor phosphorylation. The PLD requirement for differentiation can thus be attributed to its ability to trigger via mTORC2 activation the phosphorylation of an effector that could be PKCα. Moreover, PLD is involved in a counter-regulation loop expected to limit the response. This study thus brings new insights in the intricate way PLD and mTOR cooperate to control myogenesis.
Type de document :
Article dans une revue
Journal of Biological Chemistry, American Society for Biochemistry and Molecular Biology, 2011, 286 (25), pp.22609-21. 〈10.1074/jbc.M110.203885〉
Liste complète des métadonnées

Littérature citée [46 références]  Voir  Masquer  Télécharger

http://www.hal.inserm.fr/inserm-00817714
Contributeur : Evelyne Vericel <>
Soumis le : jeudi 25 avril 2013 - 11:13:14
Dernière modification le : jeudi 8 février 2018 - 11:09:56
Document(s) archivé(s) le : vendredi 26 juillet 2013 - 04:02:49

Fichier

JBC_Jaafar.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Rami Jaafar, Caroline Zeiller, Luciano Pirola, Antonio Di Grazia, Fabio Naro, et al.. Phospholipase D regulates myogenic differentiation through the activation of both mTORC1 and mTORC2 complexes.: Phospholipase D and mTOR in myogenesis. Journal of Biological Chemistry, American Society for Biochemistry and Molecular Biology, 2011, 286 (25), pp.22609-21. 〈10.1074/jbc.M110.203885〉. 〈inserm-00817714〉

Partager

Métriques

Consultations de la notice

259

Téléchargements de fichiers

267