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巨细胞利用肝细胞谷氨酸促进肝脏再生

María Del Mar Rigual¹, Mariana Angulo-Aguado¹, Sladjana Zagorac¹

¹Growth Factors, Nutrients and Cancer Group, Molecular Oncology Programme, Centro Nacional Investigaciones Oncológicas (CNIO), Madrid, Spain.

|March 27, 2025

概括

非传统的RPB5预折蛋白交互体1 (URI1) 激活周周肝细胞中的谷氨酸合成酶 (GS),控制谷氨酸水平以加速肝脏的再生. 在肝损伤模型中,补充谷氨酸可提高肝细胞的增殖和存活率.

科学领域:

肝病学
分子生物学
复原医学

背景情况:

肝切除术后的肝脏再生至关重要,但其分子机制尚未完全理解.
具体的肝细胞群和影响再生效率的因素需要进一步阐明.

研究的目的:

研究控制肝脏再生效率的分子机制和特定肝细胞群.
确定肝切除术后调节肝脏恢复的新因素和途径.

主要方法:

在小鼠模型中利用URI1和GS的遗传枯竭和过度表达.
研究了谷氨酸,巨细胞重编程,HIF1α,WNT3和YAP1在肝脏再生中的作用.
在人类肝病样本中分析了URI1和GS的同位点和与WNT3的相关性.

主要成果:

在周围肝细胞中,URI1仅与GS同位,结合并激活.
通过增加循环中的谷氨酸,使肝细胞中GS或URI1的消耗加速肝脏再生.
谷氨酸重编程巨细胞,激活WNT3/YAP1信号,促进肝细胞的增殖和肝脏的再生.
在包括肝硬化小鼠在内的各种肝损伤模型中,谷氨酸补充剂提高了肝细胞的增殖和存活率.

结论:

URI1- GS相互作用调节谷氨酸水平,微调肝脏生长以实现平衡.
在接受肝切除术或等待移植的患者中,补充谷氨酸具有增强肝脏再生的治疗潜力.
在人类肝脏疾病中,URI1和GS的表达模式与WNT3相关,这表明有保存机制.

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