在肺纤维化中,TGF-β协调氨酸合成和进口,用于肌纤维细胞分化
Fei Li1, Niv Vigder2,3,4, David R Ziehr5
1Department of Medicine, The Warren Alpert Medical School of Brown University, Providence, RI, USA.
bioRxiv : the preprint server for biology
|August 8, 2025
概括
氨酸是一个关键的代谢物,支持在异常性肺纤维化 (IPF) 中纤维细胞分化. 针对其合成和进口可能为纤维化肺病提供新的治疗策略.
科学领域:
- 细胞生物学 细胞生物学
- 代谢途径 代谢途径
- 肺部医学 肺部医学
背景情况:
- 异形性肺纤维化 (IPF) 是一种进展性肺病,其特征是纤维细胞激活.
- 纤维细胞分化成肌纤维细胞在IPF病变发生过程中至关重要,需要代谢适应.
研究的目的:
- 为了识别IPF中纤维细胞与肌纤维细胞分化的关键代谢物.
- 阐明氨酸代谢在支持肌纤维细胞分化中的作用.
- 探索氨酸代谢途径中的潜在治疗点.
主要方法:
- 通过使用正常和IPF肺纤维细胞,研究了氨酸在纤维细胞分化中的作用.
- 利用TGF-β刺激诱导肌纤维细胞分化.
- 研究了GPT2 (氨酸合成) 和SLC38A2 (氨酸/氨酸运输) 的表达和功能.
- 评估了抑制GPT2和SLC38A2对体外和精密切割肺部切片中的纤维素反应的影响.
主要成果:
- 标识了氨酸作为一个关键的代谢物,使纤维细胞分化和代谢灵活性.
- 在肺纤维细胞中,TGF-β上调氨酸合成 (通过GPT2) 和进口 (通过SLC38A2).
- 抑制GPT2降低了氨酸水平,并抑制了肌纤维细胞标记物 (α-SMA,COL1A1),这种效应被氨酸补充剂所挽救.
- SLC38A2被确定为氨酸和谷氨酸的关键载体,由TGF-β上调调节.
- 联合抑制GPT2和SLC38A2抑制了纤维细胞和肺组织中的纤维激素反应.
结论:
- 通过GPT2和SLC38A2调节的氨酸代谢对于IPF中的肌纤维细胞分化至关重要.
- 向GPT2和SLC38A2代表了治疗纤维化肺部疾病 (如IPF) 的有前途的治疗策略.
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