赖氨酰氧化酶
弹性蛋白
医学
间歇性缺氧
下调和上调
缺氧(环境)
组织蛋白酶
内科学
炎症
基质金属蛋白酶
细胞凋亡
内分泌学
细胞外基质
男科
组织蛋白酶
病理
化学
生物化学
氧气
酶
基因
有机化学
阻塞性睡眠呼吸暂停
作者
Yunyun Yang,Linyi Li,Xiaolu Jiao,Lixin Jia,Xiaoping Zhang,Yue-Li Wang,Song Yang,Juan Li,Jie Du,Yongxiang Wei,Yanwen Qin
标识
DOI:10.1016/j.ejvs.2019.10.014
摘要
Thoracic aortic dissection (TAD) has a high mortality rate. Intermittent hypoxia (IH) triggers both harmful and beneficial effects in numerous physiological systems. The effects of IH on TAD development were explored in a mouse model.β-Aminopropionitrile monofumarate (BAPN) was used to induce TAD in C57BL/6 mice. Three week old male mice were treated with 1 g/kg/day BAPN in drinking water for four weeks and simultaneously subjected to IH (n = 30) (21%-5% O2, 90 s/cycle, 10 h/day, IH + BAPN group) or normoxia (n = 30) (21% O2, 24 h/day, BAPN group). Human VSMCs (HUASMCs) exposed to IH (30 min, 5% O2)/re-oxygenation (30 min, 21% O2) cycles with a maximum of 60 min/cycle to detect the effect of IH on HIF-1α and LOX via HIF-1α-siRNA.It was found that BAPN administration significantly increased the lumen size and wall thickness of aortas compared with the normal group, but was significantly reversed by IH exposure. Additionally, IH exposure significantly increased the survival rate of BAPN induced TAD (70% vs. 40%). Furthermore, IH exposure reduced BAPN induced elastin breaks and apoptosis of vascular smooth muscle cells. IH exposure also reversed BAPN induced upregulation of inflammation and extracellular matrix (ECM) degradation. Real time polymerase chain reaction (RT-PCR) confirmed that IH inhibited inflammation and ECM degradation related genes interleukin (IL)-1β, IL-6, cathepsin S (Cat S), and matrix metalloproteinase 9 (MMP-9), but upregulated the ECM synthesis related genes lysyl oxidase (LOX) and collagen type I alpha2 (Col1a2) compared with the BAPN group. In vitro results suggest that IH promotes the expression of LOX via HIF-1α.The results suggest that IH alleviates BAPN induced TAD in C57BL/6 mice.
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