分支链α-酸有氧激活血管细胞中的HIF1α信号传递
Wusheng Xiao1,2,3,4, Nishith Shrimali1, William M Oldham1
1Divisions of Cardiovascular Medicine and Pulmonary and Critical Care Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115, USA.
bioRxiv : the preprint server for biology
|June 10, 2024
概括
分支链α-酸 (BCKA) 在正常氧气条件下激活催氧诱导因子1α (HIF1α) 信号. 这种BCKA-HIF1α通路影响血管光滑肌肉细胞功能,可能与肺动脉高血压有关.
科学领域:
- 细胞生物学 细胞生物学
- 代谢调节 代谢调节 代谢调节
- 血管生理学 血管生理学
背景情况:
- 低氧诱导因子1α (HIF1α) 是细胞对低氧反应的关键调节者.
- 有氧HIF1α激活的机制及其在原始细胞中的后果尚未完全理解.
研究的目的:
- 研究人类初级血管细胞中的有氧HIF1α激活.
- 阐明这种激活的分子机制和生物影响.
- 探索这种途径在肺动脉高血压 (PAH) 中的作用.
主要方法:
- 在环境氧气下对人类初级血管细胞和肺组织中HIF1α信号的分析.
- 研究分支链α-酸 (BCKA) 作为有氧HIF1α激活的媒介.
- 评估BCKA对含有prolyl氧化酶域的蛋白2 (PHD2) 和乳酸脱酶A (LDHA) 活性的影响.
- 在肺动脉高血压和患者衍生细胞的老鼠模型中评估BCKA诱导的代谢功能障碍.
主要成果:
- 在环境氧水平下,HIF1α信号在人体初级血管细胞和肺血管光滑肌细胞 (VSMC) 中被激活.
- 空气性HIF1α激活是由BCKA介导的,BCKA直接或间接通过LDHA生成的L-2-基酸盐 (L2HG) 抑制PHD2活性.
- BCKAAs诱导代谢功能障碍,刺激糖解,并在VSMC中促进合成表型,在正常和PAH环境中观察到.
结论:
- BCKA 是一种新型信号代谢物,在normoxia下激活HIF1α信号.
- 该BCKA-HIF1α通路影响VSMC功能.
- 这一途径可能与像PAH这样的肺血管疾病的病理生物学有关.
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