氧化DNA损伤促进了与细胞外矩阵调节蛋白的变化相关的血管衰老
Kirsty Foote1, Marieke Rienks2, Lukas Schmidt2
1Section of Cardiorespiratory Medicine, University of Cambridge, Victor Phillip Dahdaleh Heart & Lung Research Institute, Papworth Road, Cambridge Biomedical Campus, Cambridge CB2 0BB, UK.
氧化性DNA损伤有助于血管衰老和硬化. 基切除修复酶8-Oxoguanine DNA Glycosylase (Ogg1) 对此进行保护,调节细胞外矩阵蛋白质.
科学领域:
- 心血管生物学 心血管生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 血管衰老的特征是血管由于细胞外基质 (ECM) 蛋白质沉积而变硬.
- 氧化DNA损伤与血管衰老有关,但其对ECM蛋白和血管硬的调节作用尚不清楚.
研究的目的:
- 在血管衰老的背景下,确定氧化DNA损伤和ECM调节蛋白之间的关系.
主要方法:
- 在小鼠中检查了氧化DNA损伤,基切除修复 (BER) 酶8-Oxoguanine DNA Glycosylase (Ogg1) 和其调节剂,衰老标志物和ECM蛋白质组.
- 在体内使用对照,Ogg1淘汰和Ogg1表达小鼠评估血管度.
- 研究了Ogg1过度表达对ECM调节蛋白的 in vitro和 in vivo 影响.
主要成果:
- 在小鼠中,血管衰老与氧化性DNA损伤增加以及Ogg1表达和活性降低相关.
- 缺少Ogg1会加剧血管硬,而Ogg1的表达会使动脉的顺应性和延展性正常化.
- ECM蛋白质组学揭示了与年龄相关的原蛋白变化和 lysyl氧化酶 (LOX) 和 WISP2 的下调;Ogg1过度表达上调了LOX和WISP2.
结论:
- 血管衰老涉及氧化DNA损伤,减少BER蛋白表达和改变ECM蛋白.
- 通过调节ECM调节蛋白,如LOX和WISP2.2,Ogg1对血管衰老起着保护作用.
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