mTORC1型
生物
软骨细胞
细胞生物学
软骨
信号转导
PI3K/AKT/mTOR通路
解剖
作者
Jianquan Chen,Fanxin Long
出处
期刊:Development
[The Company of Biologists]
日期:2014-07-15
卷期号:141 (14): 2848-2854
被引量:95
摘要
Much of the mammalian skeleton is derived from a cartilage template that undergoes rapid growth during embryogenesis, but the molecular mechanism of growth regulation is not well understood. Signaling by mammalian target of rapamycin complex 1 (mTORC1) is an evolutionarily conserved mechanism that controls cellular growth. Here we report that mTORC1 signaling is activated during limb cartilage development in the mouse embryo. Disruption of mTORC1 signaling through deletion of either mTOR or the associated protein Raptor greatly diminishes embryonic skeletal growth associated with severe delays in chondrocyte hypertrophy and bone formation. The growth reduction of cartilage is not due to changes in chondrocyte proliferation or survival, but is caused by a reduction in cell size and in the amount of cartilage matrix. Metabolic labeling reveals a notable deficit in the rate of protein synthesis in Raptor-deficient chondrocytes. Thus, mTORC1 signaling controls limb skeletal growth through stimulation of protein synthesis in chondrocytes.
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