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在动脉样硬化中,Slc7a7允许巨细胞的谷氨酸分解用于修复功能

Saloua Benhmammouch¹, Coraline Borowczyk¹, Clara Pierrot-Blanchet¹

¹Institut National de la Santé et de la Recherche Médicale U1065, Université Côte d'Azur, Centre Méditerranéen de Médecine Moléculaire, Atip-Avenir, Institut Hospitalo-Universitaire (IHU) RespirERA, Nice, France.

Nature metabolism

|September 22, 2025

概括

巨细胞通过SLC7A7吸收谷氨酸对于控制动脉样硬化至关重要. 降低SLC7A7会影响谷氨酸溶解,加速斑块的形成和不稳定.

科学领域:

心血管生物学心血管生物学
细胞的新陈代谢
免疫学免疫学免疫学

背景情况:

动脉样硬化涉及动脉壁炎症,其中巨细胞发挥着关键作用.
巨细胞中的代谢重编程会影响动脉样硬化斑块的进展.

研究的目的:

调查巨细胞谷氨酸酶活性和谷氨酸代谢在动脉样硬化中的作用.
为了确定所涉及的特定的谷氨胺酶 (GLS) 异型以及谷氨胺吸收的机制.

主要方法:

在巨细胞中检查了谷氨酸酶的活性和表达 (GLS-1与GLS-2).
评估了SLC7A7输送器沉默对谷氨胺流入和谷氨胺溶解的影响.
在动脉样硬化的小鼠模型中利用了宏细胞特异性的Slc7a7删除.

主要成果:

减少巨细胞谷氨酶活性与GLS-1相关,而不是GLS-2的表达.
由SLC7A7介导的巨细胞谷氨胺的流入,对于GLS-1依赖的谷氨胺溶解和恢复功能至关重要.
巨细胞特定的Slc7a7删除在小鼠中加速了动脉样硬化,导致更复杂的死核.
由外源性谷氨胺流驱动的细胞内在谷氨溶解调节会影响巨细胞的代谢和转录状态.

结论:

在动脉样硬化期间,在调节巨细胞功能的过程中,SLC7A7依赖的谷氨酸吸收对谷氨酸溶解的上游至关重要.
这种途径通过平衡巨细胞重塑和修复功能来影响动脉样硬化斑块的发育和稳定性.

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