J Cell Biol 2012,
PMID: 22711699
Winbanks, Catherine E; Weeks, Kate L; Thomson, Rachel E; Sepulveda, Patricio V; Beyer, Claudia; Qian, Hongwei; Chen, Justin L; Allen, James M; Lancaster, Graeme I; Febbraio, Mark A; Harrison, Craig A; McMullen, Julie R; Chamberlain, Jeffrey S; Gregorevic, Paul
Follistatin is essential for skeletal muscle development and growth, but the intracellular signaling networks that regulate follistatin-mediated effects are not well defined. We show here that the administration of an adeno-associated viral vector expressing follistatin-288aa (rAAV6:Fst-288) markedly increased muscle mass and force-producing capacity concomitant with increased protein synthesis and mammalian target of rapamycin (mTOR) activation. These effects were attenuated by inhibition of mTOR or deletion of S6K1/2. Furthermore, we identify Smad3 as the critical intracellular link that mediates the effects of follistatin on mTOR signaling. Expression of constitutively active Smad3 not only markedly prevented skeletal muscle growth induced by follistatin but also potently suppressed follistatin-induced Akt/mTOR/S6K signaling. Importantly, the regulation of Smad3- and mTOR-dependent events by follistatin occurred independently of overexpression or knockout of myostatin, a key repressor of muscle development that can regulate Smad3 and mTOR signaling and that is itself inhibited by follistatin. These findings identify a critical role of Smad3/Akt/mTOR/S6K/S6RP signaling in follistatin-mediated muscle growth that operates independently of myostatin-driven mechanisms.
Diseases/Pathways annotated by Medline MESH: Hypertrophy
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Text Mining Data
mTOR signaling — follistatin: " Furthermore, we identify Smad3 as the critical intracellular link that mediates the
effects of
follistatin on
mTOR signaling "
Akt/mTOR/S6K ⊣ Smad3: " Expression of constitutively active Smad3 not only markedly prevented skeletal muscle growth induced by follistatin but also potently suppressed follistatin induced Akt/mTOR/S6K signaling "
Akt/mTOR/S6K ⊣ Smad3: " Expression of constitutively active Smad3 not only markedly prevented skeletal muscle growth induced by follistatin but also potently suppressed follistatin induced Akt/mTOR/S6K signaling "
Akt/mTOR/S6K → follistatin: " Expression of constitutively active Smad3 not only markedly prevented skeletal muscle growth induced by follistatin but also potently suppressed follistatin induced Akt/mTOR/S6K signaling "
Akt/mTOR/S6K → follistatin: " Expression of constitutively active Smad3 not only markedly prevented skeletal muscle growth induced by follistatin but also potently suppressed follistatin induced Akt/mTOR/S6K signaling "
mTOR signaling ⊣ follistatin: " Importantly, the regulation of Smad3- and mTOR dependent events by follistatin occurred independently of overexpression or knockout of myostatin, a key repressor of muscle development that can regulate Smad3 and mTOR signaling and that is itself inhibited by follistatin "
Smad3 ⊣ follistatin: " Importantly, the regulation of Smad3- and mTOR dependent events by follistatin occurred independently of overexpression or knockout of myostatin, a key repressor of muscle development that can regulate Smad3 and mTOR signaling and that is itself inhibited by follistatin "
Manually curated Databases
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