氨酸转运体SLC6A6的表达促进了介质细胞干细胞的功能
Christina M Kaszuba1,2, Sonali Sharma2,3, Benjamin J Rodems2,3
1Department of Biomedical Engineering, University of Rochester, Rochester, NY 14642, USA.
bioRxiv : the preprint server for biology
|July 16, 2025
概括
氨酸运输体 (TauT) 对于介质干细胞 (MSC) 功能和骨健康至关重要. 陶的损失会损害MSC分化,骨密度和造血干细胞支持,突出突出 taurine 的吸收.
科学领域:
- 骨生物学和再生医学 骨生物学和再生医学
- 干细胞生物学 干细胞生物学
- 分子和细胞生理学分子和细胞生理学
背景情况:
- 介酶体干细胞 (MSC) 在骨髓微环境中对骨发育,修复和造血干细胞 (HSC) 调节至关重要.
- 氨酸的依赖离子的载体 (TauT),编码由Slc6a6,表达在MSC中,这表明它在骨平衡中发挥了作用.
- 氨酸对老年人群骨缺陷的潜在益处已被注意到,但其通过TauT在骨质结合细胞中的直接作用尚不清楚.
研究的目的:
- 为了研究 taurine 载体 (TauT) 在介酶体 stromal 细胞 (MSC) 功能和骨质分化中的作用.
- 为了确定TauT损失对骨矿物质密度,骨强度和血液形成干细胞/原始细胞支持 in vivo的影响.
- 阐明TAUT对MSC命运决定的影响的分子机制.
主要方法:
- 使用年轻的tauT遗传功能丧失的小鼠模型 (淘汰赛小鼠).
- 在初级人类MSCs上进行了体外骨质生成差异化试验,通过shRNA进行SLC6A6敲击.
- 进行了单细胞RNA测序,RNA测序和同种植实验,这些实验与血造干细胞/原始细胞种群进行.
主要成果:
- 在小鼠体内,tauT损失损害了MSC群体的体内和体外骨质分化,与骨矿物质密度和强度的降低相关.
- 人类MSC中SLC6A6的抑制减少了骨质分化,证实了 taurine 摄取在人类MSC功能中的重要性.
- TauT-null MSCs 无法支持 HSC 的自我更新和扩张,显示下调 Wnt/β-catenin 信号,减少氧化酸化,并增加 ROS 水平.
结论:
- 氨酸运输体 (TauT) 对于维持中介酶层细胞 (MSC) 种群和调节其骨质分化至关重要.
- 在TauT缺乏的MSC中,受损的Wnt信号传递和高氧化应激有助于缺陷骨质生成.
- 氨酸的吸收被确定为MSC维护和骨质性命运的关键调节者,影响骨健康和HSC支持.
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