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静音信息调节器1保护心脏免受缺血/再输血的影响
Chiao-Po Hsu1, Peiyong Zhai, Takanobu Yamamoto
1Department of Cell Biology and Molecular Medicine, Cardiovascular Research Institute, University of Medicine and Dentistry of New Jersey, Newark, 07103, USA.
Circulation
|November 10, 2010
概括
静音信息调节器1 (Sirt1) 保护心脏免受缺血/再输血 (I/R) 损伤. 抑制Sirt1可以通过激活保护基因和抑制细胞死亡途径来减少心脏损伤和氧化应激.
科学领域:
- 心血管生物学 心血管生物学
- 分子心脏病学分子心脏病学
- 生物化学 生物化学
背景情况:
- 沉默信息调节剂1 (Sirt1) 是一种已知的减缓衰老和保护氧化应激的基因组脱乙酶.
- 研究了它在心肌缺血/反 (I/R) 损伤中的作用,这是心血管疾病中的关键条件.
研究的目的:
- 为了确定Sirt1是否能保护心肌缺血/再生 (I/R) 损伤.
- 阐明Sirt1在心脏中的潜在保护作用背后的分子机制.
主要方法:
- 使用心脏特异性Sirt1淘汰和转基因过度表达的小鼠模型.
- 评估了心肌梗塞的大小,亡标志物 (TUNL染色),以及I/R后的心脏功能.
- 分析了关键的亲生存和亲亡分子的表达.
- 研究了FoxO1转录因子在Sirt1介导保护中的作用.
主要成果:
- 缺血/再输液 (I/R) 显著降低了Sirt1在心脏中的表达.
- 与对照组相比,Sirt1淘汰赛小鼠的心脏病发作大小增加 (44%vs15%).
- Sirt1过度表达减少了心脏病发作的大小 (15%与36%) 和亡.
- Sirt1增强了心脏功能恢复和高调的抗氧化酶 (超氧化物脱酶,氧素-1) 和Bcl-xL,同时降低了Bax和分裂的caspase-3.
- 对FoxO1的Sirt1激活对于高调节抗氧化剂和减少氧化应激至关重要.
结论:
- 在Sirt1的研究中,Sirt1显示出对心肌体I/R损伤的显著保护作用.
- 保护通过调节抗氧化防御和通过FoxO1激活降低调节亲亡因子来调节保护.
- 在I/R事件期间,Sirt1激活导致心肌细胞氧化应激降低.
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