Spatial heterogeneity of bone marrow endothelial cells unveils a distinct subtype in the epiphysis.

Spatial heterogeneity of bone marrow endothelial cells unveils a distinct subtype in the epiphysis.
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DOI:
10.1038/s41556-023-01240-7
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发表时间:
2023-10
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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骨髓内皮细胞(BMEC)在骨形成和造血中发挥关键作用。尽管最近的研究揭示了骨髓 (BM) 基质区室的细胞分类,但 BMEC 的复杂性尚未得到充分表征。在本研究中,利用单细胞 RNA 测序,我们定义了 BMEC 的空间异质性,并确定了一种毛细血管亚型,称为 S 型(二次骨化)内皮细胞 (EC),仅存在于骨骺中。 S型EC在结构、可塑性和基因表达谱方面具有独特的表型特征。遗传实验表明,S 型 EC 通过分泌最丰富的骨基质成分 I 型胶原蛋白,非典型地有助于获得骨强度。此外,这些细胞形成了造血干细胞的独特储存库。这些发现为 BM 脉管系统中的细胞结构提供了概况,并强调了骨骺 EC 在骨骼和造血发育过程中的重要性。伊加等人。进行单细胞 RNA 测序并鉴定出一种独特的骨髓内皮细胞亚型,该亚型有助于获得骨强度并提供独特的造血干细胞生态位。
Bone marrow endothelial cells (BMECs) play a key role in bone formation and haematopoiesis. Although recent studies uncovered the cellular taxonomy of stromal compartments in the bone marrow (BM), the complexity of BMECs is not fully characterized. In the present study, using single-cell RNA sequencing, we defined a spatial heterogeneity of BMECs and identified a capillary subtype, termed type S (secondary ossification) endothelial cells (ECs), exclusively existing in the epiphysis. Type S ECs possessed unique phenotypic characteristics in terms of structure, plasticity and gene expression profiles. Genetic experiments showed that type S ECs atypically contributed to the acquisition of bone strength by secreting type I collagen, the most abundant bone matrix component. Moreover, these cells formed a distinct reservoir for haematopoietic stem cells. These findings provide the landscape for the cellular architecture in the BM vasculature and underscore the importance of epiphyseal ECs during bone and haematopoietic development. Iga et al. perform single-cell RNA sequencing and identify a distinct bone marrow endothelial cell subtype that contributes to the acquisition of bone strength and offers a distinct haematopoietic stem cell niche.
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