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骨质生成和淋巴发育的机械敏感周动脉

Bo Shen¹, Alpaslan Tasdogan¹, Jessalyn M Ubellacker¹

¹Children's Research Institute and the Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA.

|February 25, 2021

概括

骨髓中的瘦素受体 (LEPR) + 细胞具有不同的亚型. 骨质素标记支持淋巴发育并需要机械刺激的骨质原体,随着年龄的增长而下降.

科学领域:

骨髓结构细胞生物学
血液形成和免疫学
干细胞研究

背景情况:

骨髓中的瘦素受体 (LEPR) + 层细胞对于造血干细胞的维持至关重要.
虽然LEPR+细胞多样化,但区分子集的标记和它们的功能是有限的.
了解LEPR+细胞异质性对于骨髓利基研究至关重要.

研究的目的:

在骨髓中识别区分LEPR+细胞子集的标记物.
研究不同LEPR+细胞群体在血液形成和骨质生成中的功能作用.
通过机械刺激和衰老来调节这些祖细胞.

主要方法:

使用骨质质素作为分辨周动脉和周鼻LEPR+细胞的标记.
在骨质质素+细胞中进行干细胞因子 (SCF) 的遗传删除.
研究了机械刺激 (自愿跑步,后肢卸载) 对细胞群的影响.
评估了机械敏感离子通道PIEZO1在骨质质素+细胞中的作用.

主要成果:

骨质质素表达区分骨质基平衡周动脉LEPR+细胞和脂肪基平衡周鼻状LEPR+细胞.
从骨质质素+细胞中删除SCF会损害淋巴发育和免疫反应,但不会维持HSC.
周动脉骨质蛋白+ 细胞和常见的淋巴细胞由机械刺激维持并随着年龄的增长而减少.
在骨质质素+ 细胞中,PIEZO1 缺失导致了这些细胞和淋巴原体的枯竭.

结论:

骨质素标识了一种特定的骨髓原始体,参与骨质生成和淋巴发育.
机械刺激对于维持周动脉和相关的祖先种群至关重要.
机械刺激与年龄相关的下降可能导致骨髓骨质生成和淋巴发育的减少.

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