The translation regulatory subunit eIF3f controls the kinase-dependent mTOR signaling required for muscle differentiation and hypertrophy in mouse.

The translation regulatory subunit eIF3f controls the kinase-dependent mTOR signaling required for muscle differentiation and hypertrophy in mouse.
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DOI:
10.1371/journal.pone.0008994
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发表时间:
2010-02-01
期刊:
影响因子:
3.7
通讯作者:
Leibovitch SA
Leibovitch SA
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Csibi A;Cornille K;Leibovitch MP;Poupon A;Tintignac LA;Sanchez AM;Leibovitch SA

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mTORC 1通路通过S6 K1和4 E-BP 1的磷酸化控制哺乳动物的翻译机制,是终末肌肉分化和肥大所必需的。mTOR和S6 K1通过与eIF 3起始复合物相互作用而连接。调节亚基eIF 3f在肌肉肥大中起主要作用,并且是在萎缩期间解释MAFbx功能的关键靶标。在这里,我们提出的证据表明,在MAFbx诱导的萎缩中,eIF 3f的降解抑制了mTOR对S6 K1的激活,而对MAFbx多聚泛素化不敏感的eIF 3f突变体保持了S6 K1和rpS 6的持续磷酸化。在终末肌肉分化期间,eIF 3f中的保守TOS基序连接mTOR/raptor复合物,其磷酸化S6 K1并调节mTOR和Cap依赖性翻译起始的下游效应物。因此,eIF 3f在mTORC 1调节骨骼肌大小的适当活性中起主要作用。
The mTORC1 pathway is required for both the terminal muscle differentiation and hypertrophy by controlling the mammalian translational machinery via phosphorylation of S6K1 and 4E-BP1. mTOR and S6K1 are connected by interacting with the eIF3 initiation complex. The regulatory subunit eIF3f plays a major role in muscle hypertrophy and is a key target that accounts for MAFbx function during atrophy. Here we present evidence that in MAFbx-induced atrophy the degradation of eIF3f suppresses S6K1 activation by mTOR, whereas an eIF3f mutant insensitive to MAFbx polyubiquitination maintained persistent phosphorylation of S6K1 and rpS6. During terminal muscle differentiation a conserved TOS motif in eIF3f connects mTOR/raptor complex, which phosphorylates S6K1 and regulates downstream effectors of mTOR and Cap-dependent translation initiation. Thus eIF3f plays a major role for proper activity of mTORC1 to regulate skeletal muscle size.
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