Int J Cardiol:腹主动脉瘤氧化应激与NADPH氧化酶相关

2013-08-01 coffeecoffee dxy

腹主动脉瘤(AAA)是心血管发病和死亡的主要原因之一。AAA的多种机制,如血管炎症与金属基质蛋白酶活性升高,可能都与氧化应激有关,然而血管内自由基的产生机制仍旧未知。波兰雅盖隆大学的Barlomiej Guzik等人对AAA中血管过氧化物(O2-)产生的来源与分子调节机制进行了研究,发现氧化应激与NADPH氧化酶相关。研究结果发表于《国际心脏病学杂志》。 研究共招募40名接受腹主动脉瘤修复术的患

腹主动脉瘤(AAA)是心血管发病和死亡的主要原因之一。AAA的多种机制,如血管炎症与金属基质蛋白酶活性升高,可能都与氧化应激有关,然而血管内自由基的产生机制仍旧未知。波兰雅盖隆大学的Barlomiej Guzik等人对AAA中血管过氧化物(O2-)产生的来源与分子调节机制进行了研究,发现氧化应激与NADPH氧化酶相关。研究结果发表于《国际心脏病学杂志》。

研究共招募40名接受腹主动脉瘤修复术的患者,取AAA节段和与之匹配的未扩张主动脉样本进行比较。检测结果发现,与风险因子匹配的对照组相比, AAA患者血浆MDA水平较高,产生的超氧化物也高于未扩张的主动脉样本。抑制黄嘌呤氧化酶、线粒体氧化酶、环氧酶和蛋白激酶C,对AAA中超氧化物的生成均无显著影响。

对NADPH氧化酶亚基mRNA水平检测发现,AAA中p22phox、nox2和nox5水平显著升高,但nox4表达显著降低。AAA修复风险Vanzetto得分越高者超氧化物产量越高,后者同时与AAA患者吸烟、高胆固醇血症及CAD显著相关。基线超氧化物产量及NADPH氧化酶活性与动脉瘤大小相关。

研究结果提示,NADPH氧化酶和iNOS是AAA中O2- 的主要来源,NADPH氧化酶表达和活性的增加是引起腹主动脉瘤氧化应激的重要机制之一。解耦连iNOS可能是将氧化应激与AAA炎症联系到一起的关键。此外,氧化应激还与AAA患者动脉瘤大小及临床风险因子相关。

Guzik B, Sagan A, Ludew D, Mrowiecki W, Chwała M, Bujak-Gizycka B, Filip G, Grudzien G, Kapelak B, Zmudka K, Mrowiecki T, Sadowski J, Korbut R, Guzik TJ.Mechanisms of oxidative stress in human aortic aneurysms - Association with clinical risk factors for atherosclerosis and disease severity.Int J Cardiol. 2013 Mar 15. doi:pii: S0167-5273(13)00357-4. 10.1016/j.ijcard.2013.01.278. [Epub ahead of print]

PMID:
23506637

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    2013-08-03 pandamao2016

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