Hepatic thrombopoietin is required for bone marrow hematopoietic stem cell maintenance.

Hepatic thrombopoietin is required for bone marrow hematopoietic stem cell maintenance.
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DOI:
10.1126/science.aap8861
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发表时间:
2018-04-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Ding L
Ding L
中科院分区:
其他
文献类型:
--
作者:
Decker M;Leslie J;Liu Q;Ding L

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造血干细胞(HSC)的维持依赖于外在的线索。目前,只有来自骨髓小生境的局部信号才能维持HSC。然而,尚不清楚系统性因素是否也维持HSC。我们评估了血小板生成素(TPO)的生理来源,TPO是维持HSC所需的关键细胞因子。使用TpoDsRed-CreER敲入小鼠,我们表明TPO由肝细胞表达,但不由骨髓细胞表达。从造血细胞、成骨细胞或骨髓间充质基质细胞中缺失Tpo不影响HSC的数量或功能。然而,当从肝细胞中删除Tpo时,骨髓HSC被耗尽。因此,骨髓HSC的维持需要一种跨器官因子,即肝细胞在肝脏中产生的循环TPO。我们的研究结果表明,系统因素,除了当地的生态位,是一个关键的外部组成部分HSC的维护。
Hematopoietic stem cell (HSC) maintenance depends on extrinsic cues. Currently, only local signals arising from the bone marrow niche have been shown to maintain HSCs. However, it is not known whether systemic factors also sustain HSCs. We assessed the physiological source of thrombopoietin (TPO), a key cytokine required for maintaining HSCs. Using TpoDsRed-CreER knock-in mice, we showed that TPO is expressed by hepatocytes but not by bone marrow cells. Deletion of Tpo from hematopoietic cells, osteoblasts, or bone marrow mesenchymal stromal cells does not affect HSC number or function. However, when Tpo is deleted from hepatocytes, bone marrow HSCs are depleted. Thus, a cross-organ factor, circulating TPO made in the liver by hepatocytes, is required for bone marrow HSC maintenance. Our results demonstrate that systemic factors, in addition to the local niche, are a critical extrinsic component for HSC maintenance.
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