RANKL,但不是R-Spondins,通过LGR4相互作用参与血管光滑肌肉细胞化
Sara Fernández-Villabrille1,2, Julia Martín-Vírgala1,2, Beatriz Martín-Carro1,2
1Metabolismo Óseo, Vascular y Enfermedades Inflamatorias Crónicas, Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Spain.
International journal of molecular sciences
|June 19, 2024
概括
血管化与骨质损失有关. 这项研究揭示了核因子卡帕B连接体 (RANKL) 的受体激活剂与含有丰富的白素的重复含有G蛋白结合受体4 (LGR4) 相互作用,通过促进光滑肌肉细胞中的骨质分化,驱动血管化.
科学领域:
- 生物化学 生化学
- 细胞生物学 细胞生物学
- 身体生理学 身体生理学
背景情况:
- 血管化是一个全球性的健康挑战,通常与骨质损失相关.
- 核因子卡帕B (RANK) /RANK连接体 (RANKL) /骨质保护蛋白 (OPG) 系统的受体激活器对骨代谢至关重要,并与血管化有关.
- 氨酸丰富的重复含有G蛋白结合受体4 (LGR4),RANKL受体,参与骨重塑和潜在的血管化,与R-spondins (RSPOs) 相互作用.
研究的目的:
- 研究RANKL/LGR4轴在血管化中的作用.
- 探索高酸盐和副甲状腺激素 (PTH) 对血管化和RANKL/LGR4系统的影响.
- 评估RANK/RANKL/OPG系统和LGR4配体在化的人类血管组织中的表达.
主要方法:
- 在慢性功能衰竭的老鼠中,对不同饮食和PTH水平进行研究,以诱导大动脉化.
- 在体外实验中,培养的血管光滑肌细胞 (VSMC) 暴露于不同酸盐和PTH度.
- 研究可溶性RANKL对VSMC的影响以及通过基因沉默LGR4的作用.
- 从移植接受者的人类上胃动脉中对RANK/RANKL/OPG系统和LGR4配体的基因表达分析.
主要成果:
- 在大鼠中,大动脉化增加与静脉血压升高,上调Lgr4和Rankl以及下调Opg基因表达相关.
- 在体外,高酸盐增加了VSMC含量,Rankl和Lgr4表达,同时降低了Opg;高PTH加剧了这些影响.
- 溶性RANKL诱导了VSMC化,部分由LGR4介导,化的人类动脉显示出更高的RANKL基因表达. RSPOs的影响最小.
结论:
- 通过其受体LGR4作用,RANKL促进VSMC中的骨质分化,通过一种新的机制促进血管化.
- RANKL/LGR4通路是血管化的重要因素,特别是在高酸盐和高PTH的条件下.
- 针对RANKL/LGR4相互作用可能为血管化提供治疗策略,独立于经典的RANK-RANKL途径.
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