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首页> 外文期刊>Journal of bone and mineral research: the official journal of the American Society for Bone and Mineral Research >The Amino Acid SensorEif2ak4/GCN2Is Required for Proliferation of Osteoblast Progenitors in Mice
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The Amino Acid SensorEif2ak4/GCN2Is Required for Proliferation of Osteoblast Progenitors in Mice

机译:氨基酸敏感剂,用于小鼠中成骨细胞祖细胞的增殖所需的氨基酸敏感剂

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摘要

Skeletal stem/progenitor cells (SSPC) are critical regulators of bone homeostasis by providing a continuous supply of osteoblasts throughout life. In response to inductive signals, SSPC proliferate before osteoblast differentiation. Proliferation requires the duplication of all cellular components before cell division. This imposes a unique biosynthetic requirement for amino acids that can be used for biomass production. Thus, the ability to sense and respond to amino acid availability is likely a major determinant for proliferation. Using a cellular and genetic approach, we demonstrate the amino acid sensor GCN2 is required to support the robust proliferative capacity of SSPC during bone homeostasis. GCN2 ablation results in decreased postnatal bone mass due primarily to reduced osteoblast numbers. Decreased osteoblast numbers is likely attributed to reduced SSPC proliferation as loss of GCN2 specifically affected proliferation in cultured bone marrow stromal cells (BMSCs) without impacting osteoblast differentiation in vitro. Mechanistically, GCN2 regulates proliferation by increasing amino acid uptake downstream of the transcriptional effector ATF4. Collectively, these data suggest amino acid sensing through the GCN2/ATF4 pathway is indispensable for robust SSPC proliferation necessary for bone homeostasis. (c) 2020 American Society for Bone and Mineral Research.
机译:骨骼干/祖细胞(SSPC)是骨内稳态的关键调节因子,在整个生命周期中持续提供成骨细胞。作为对诱导信号的反应,SSPC在成骨细胞分化之前增殖。增殖需要在细胞分裂之前复制所有细胞成分。这对可用于生物质生产的氨基酸提出了独特的生物合成要求。因此,感知和响应氨基酸可用性的能力可能是细胞增殖的主要决定因素。通过细胞和遗传学方法,我们证明了氨基酸传感器GCN2需要在骨内稳态期间支持SSPC的强大增殖能力。GCN2消融导致出生后骨量减少,主要原因是成骨细胞数量减少。成骨细胞数量的减少可能归因于SSPC增殖的减少,因为GCN2的缺失在不影响体外成骨细胞分化的情况下特异性地影响了培养的骨髓基质细胞(BMSCs)的增殖。在机制上,GCN2通过增加转录效应子ATF4下游的氨基酸摄取来调节增殖。总的来说,这些数据表明,通过GCN2/ATF4途径的氨基酸感应对于骨内稳态所需的强大SSPC增殖是必不可少的。(c) 2020年美国骨与矿物研究学会。

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