Abstract:
:Cell size is determined by the balance between protein synthesis and degradation. This equilibrium is affected by hormones, nutrients, energy levels, mechanical stress and cytokines. Mutations that inactivate myostatin lead to excessive muscle growth in animals and humans, but the signals and pathways responsible for this hypertrophy remain largely unknown. Here we show that bone morphogenetic protein (BMP) signaling, acting through Smad1, Smad5 and Smad8 (Smad1/5/8), is the fundamental hypertrophic signal in mice. Inhibition of BMP signaling causes muscle atrophy, abolishes the hypertrophic phenotype of myostatin-deficient mice and strongly exacerbates the effects of denervation and fasting. BMP-Smad1/5/8 signaling negatively regulates a gene (Fbxo30) that encodes a ubiquitin ligase required for muscle loss, which we named muscle ubiquitin ligase of the SCF complex in atrophy-1 (MUSA1). Collectively, these data identify a critical role for the BMP pathway in adult muscle maintenance, growth and atrophy.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Sartori R,Schirwis E,Blaauw B,Bortolanza S,Zhao J,Enzo E,Stantzou A,Mouisel E,Toniolo L,Ferry A,Stricker S,Goldberg AL,Dupont S,Piccolo S,Amthor H,Sandri Mdoi
10.1038/ng.2772subject
Has Abstractpub_date
2013-11-01 00:00:00pages
1309-18issue
11eissn
1061-4036issn
1546-1718pii
ng.2772journal_volume
45pub_type
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