Decline in IGF1 in the bone marrow microenvironment initiates hematopoietic stem cell aging.

Decline in IGF1 in the bone marrow microenvironment initiates hematopoietic stem cell aging.
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骨髓微环境中IGF1的下降引发造血干细胞衰老。

DOI:
10.1016/j.stem.2021.03.017
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发表时间:
2021-08-05
期刊:
影响因子:
23.9
通讯作者:
Trowbridge JJ
Trowbridge JJ
中科院分区:
医学1区
文献类型:
--
作者:
Young K;Eudy E;Bell R;Loberg MA;Stearns T;Sharma D;Velten L;Haas S;Filippi MD;Trowbridge JJ

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随着年龄的增长,造血干细胞(HSC)功能的下降是我们血液和免疫系统健康寿命有限的基础。为了保持健康进入老年,有必要了解导致HSC老化的起始事件的性质和时间。通过在小鼠中进行横断面研究,我们发现HSC和造血开始的衰老标志在中年时开始积累,并且中年时的骨髓(BM)微环境诱导造血衰老并且是造血衰老所必需的。使用无偏的方法,我们发现在局部中年BM微环境中长寿相关分子IGF 1水平的降低是导致HSC老化的一个因素。用IGF1直接刺激中年HSC可以挽救衰老的分子和功能标志,包括恢复线粒体活性。因此,虽然IGF1的下降支持长寿,但我们的工作表明这也会损害HSC功能并限制造血健康。Young等人发现了骨髓微环境在中年时启动功能性造血干细胞下降中的关键作用。中年骨髓微环境中局部IGF1的减少诱导造血干细胞衰老,并且是造血干细胞衰老所必需的。
Decline in hematopoietic stem cell (HSC) function with age underlies limited healthspan of our blood and immune systems. In order to preserve health into older age, it is necessary to understand the nature and timing of initiating events that cause HSC aging. By performing a cross-sectional study in mice, we discover that hallmarks of aging in HSCs and hematopoiesis begin to accumulate by middle age, and that the bone marrow (BM) microenvironment at middle age induces and is indispensable for hematopoietic aging. Using unbiased approaches, we find decreased levels of the longevity-associated molecule IGF1 in the local middle-aged BM microenvironment is a factor causing HSC aging. Direct stimulation of middle-aged HSCs with IGF1 rescues molecular and functional hallmarks of aging, including restored mitochondrial activity. Thus, while decline in IGF1 supports longevity, our work indicates that this also compromises HSC function and limits hematopoietic healthspan. Young et al. uncover a key role for the bone marrow microenvironment in initiating functional hematopoietic stem cell decline by middle age. Decreased local IGF1 in the middle-aged bone marrow microenvironment induces and is indispensable for hematopoietic stem cell aging.
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