Age-dependent modulation of vascular niches for haematopoietic stem cells.

Age-dependent modulation of vascular niches for haematopoietic stem cells.
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DOI:
10.1038/nature17638
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发表时间:
2016-04-21
期刊:
影响因子:
64.8
通讯作者:
Adams, Ralf H.
Adams, Ralf H.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kusumbe, Anjali P.;Ramasamy, Saravana K.;Itkin, Tomer;Mae, Maarja Andaloussi;Langen, Urs H.;Betsholtz, Christer;Lapidot, Tsvee;Adams, Ralf H.

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Blood vessels define local microenvironments in the skeletal system, play crucial roles in osteogenesis and provide niches for haematopoietic stem cells. The properties of niche-forming vessels and their changes in the ageing organism remain incompletely understood. Here, we show that Notch signalling in endothelial cells leads to the expansion of haematopoietic stem cell niches in bone, which involves increases in CD31-positive capillaries and PDGFRβ-positive perivascular cells, arteriole formation, and elevation of cellular stem cell factor levels. While endothelial hypoxia-inducible factor signalling promotes some of these aspects, it fails to enhance vascular niche function because of lacking arterialization and expansion of PDGFRβ-positive cells. In ageing mice, niche-forming vessels in the skeletal system are strongly reduced but can be restored by activation of endothelial Notch signalling. These findings argue that vascular niches for haematopoietic stem cells are part of complex, age-dependent microenvironments involving multiple cell populations and vessel subtypes.
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