Endothelial SMAD1/5 signaling couples angiogenesis to osteogenesis during long bone growth.

Endothelial SMAD1/5 signaling couples angiogenesis to osteogenesis during long bone growth.
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内皮 SMAD1/5 信号在长骨生长过程中将血管生成与成骨结合起来。

DOI:
10.1101/2023.01.07.522994
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发表时间:
2023
期刊:
bioRxiv : the preprint server for biology
影响因子:
--
通讯作者:
Boerckel,JoelD
Boerckel,JoelD
中科院分区:
--
文献类型:
--
作者:
Lang,Annemarie;Benn,Andreas;Wolter,Angelique;Balcaen,Tim;Collins,Joseph;Kerckhofs,Greet;Zwijsen,An;Boerckel,JoelD

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骨骼发育依赖于协调的血管生成和成骨。骨形态发生蛋白通过激活成骨细胞中的SMAD1/5信号来指导骨发育。然而,SMAD1/5在骨骼内皮中的作用尚不清楚。在这里,我们发现内皮细胞条件SMAD1/5缺失在幼鼠中引起干骺端和干骺端血管增生,导致松质骨和皮质骨形成改变。SMAD1/5缺失导致过度发芽,破坏干骺端血管的柱状结构,损害软骨-骨连接处吻合环的形态发生。内皮细胞SMAD1/5耗竭会损害生长板的吸收,并且在长期耗竭后,会破坏骨祖细胞向原发海绵的募集。最后,在隔膜中,内皮细胞SMAD1/5的活性是维持窦型表型所必需的,SMAD1/5的耗竭会诱导大血管袢的形成,其特征是内膜粘连蛋白表达升高、尖端细胞异位形成和高通透性。总之,内皮细胞SMAD1/5活性维持骨骼血管形态发生和功能,协调骨生长过程中生长板重塑和骨祖细胞募集动态。
Skeletal development depends on coordinated angiogenesis and osteogenesis. Bone morphogenetic proteins direct bone development by activating SMAD1/5 signaling in osteoblasts. However, the role of SMAD1/5 in skeletal endothelium is unknown. Here, we found that endothelial cell-conditional SMAD1/5 depletion in juvenile mice caused metaphyseal and diaphyseal hypervascularity, resulting in altered cancellous and cortical bone formation. SMAD1/5 depletion induced excessive sprouting, disrupting the columnar structure of the metaphyseal vessels and impaired anastomotic loop morphogenesis at the chondro-osseous junction. Endothelial SMAD1/5 depletion impaired growth plate resorption and, upon long term depletion, abrogated osteoprogenitor recruitment to the primary spongiosa. Finally, in the diaphysis, endothelial SMAD1/5 activity was necessary to maintain the sinusoidal phenotype, with SMAD1/5 depletion inducing formation of large vascular loops, featuring elevated endomucin expression, ectopic tip cell formation, and hyperpermeability. Together, endothelial SMAD1/5 activity sustains skeletal vascular morphogenesis and function and coordinates growth plate remodeling and osteoprogenitor recruitment dynamics during bone growth.
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