谷氨胺通过增加谷氨来降低氧化应激,增强内皮细胞存活率和血管扩张,以减少氧化应激
Marzyeh Kheradmand1, Gurneet Sangha1, Claire M Sissons1
1Fischell Department of Bioengineering, University of Maryland, College Park, Maryland, USA.
Physiological reports
|January 22, 2026
概括
谷氨酸补充剂可以通过减少氧化应激和改善内皮功能来保护糖尿病患者免受心血管疾病的影响. 这项研究表明,谷氨酸可以增强细胞存活率和血管扩张,提供一种潜在的治疗策略.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 心血管研究研究心血管研究
背景情况:
- 糖尿病通过高血糖引起的内皮功能障碍加剧心血管疾病.
- 氧化应激是糖尿病内皮功能障碍的关键机制.
- 谷氨胺在缓解高血糖引起的内皮功能障碍中的作用尚不清楚.
研究的目的:
- 在正常和高葡萄糖条件下研究谷氨酸对内皮细胞功能的影响.
- 确定谷氨酸能否降低氧化应激并改善高糖内皮细胞中的细胞存活率.
- 评估谷氨酸对血管扩张和氧化产生的影响.
主要方法:
- 人类冠状动脉内皮细胞被用不同度的谷氨胺和葡萄糖治疗.
- 进行了测试,以测量细胞增殖,氧化应激,细胞存活率和内皮氧化合成酶 (eNOS) 活性.
- 在隔离的小鼠动脉中评估了ex vivo血管扩张.
主要成果:
- 不管葡萄糖水平如何,谷氨酸显著增加了内皮细胞的增殖.
- 通过谷氨酶-1的谷氨胺代谢减少了氧化应激和细胞死亡,提高了谷氨和NADPH水平.
- 谷氨酸改善了ex vivo血管扩张,而不会影响体外eNOS活性或氧化.
结论:
- 谷氨酸通过提高细胞的降解能力来减轻内皮细胞的氧化压力.
- 谷氨胺对内皮功能的保护作用可能是通过减少氧化应激而不是对eNOS的直接影响来调解的.
- 谷氨胺代表了一种潜在的治疗剂,可以预防糖尿病心血管并发症.
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