Redox Biol:硝酸盐补充能够改善肾缺血再灌注损伤!

2017-06-30 Emma MedSci原创

肾脏由于其组织结构和功能的特殊性,是对缺血再灌注损伤敏感的器官之一。在临床上常见于失血或中毒性休克、弥散性血管内凝血、肾移植、肾部分切除、肾实质切开取石等手术过程中。肾缺血再灌注损伤是急性肾功能衰竭的主要原因之一,也是移植排斥反应,尤其是慢性排斥反应的重要原因。其中涉及复杂的病理过程,一氧化氮(NO)生物利用度的降低被认为是关键因素,而无机硝酸盐可通过NO合成酶非依赖途径在体内形成NO,在IR期间

肾缺血再灌注损伤(Ischemia reperfusion injury,IRI)是指肾组织缺血时和其后恢复血液灌注时器官功能不能恢复正常,甚至发生更为严重的组织损伤或器官功能衰竭。肾脏由于其组织结构和功能的特殊性,是对缺血再灌注损伤敏感的器官之一。在临床上常见于失血或中毒性休克、弥散性血管内凝血、肾移植、肾部分切除、肾实质切开取石等手术过程中。肾缺血再灌注损伤是急性肾功能衰竭的主要原因之一,也是移植排斥反应,尤其是慢性排斥反应的重要原因。其中涉及复杂的病理过程,一氧化氮(NO)生物利用度的降低被认为是关键因素,而无机硝酸盐可通过NO合成酶非依赖途径在体内形成NO,在IR期间起到作用。

发表于Redox Biol的一篇文章报道,研究人员利用雄性小鼠作为研究模型,分为对照组和试验组,对照组小鼠饲喂标准饲料,试验组小鼠于IR两周前开始饲喂硝酸盐补充饲料(1.0mmol/kg/d)。结果显示,单侧肾脏IR引起了肾小管和肾小球损伤;肾功能、血浆肌酐水平、肾小球滤过率和肾血浆流量也均有损伤。而硝酸盐补充显著的改善了这些损伤,减少了肾脏超氧化物的产生,促炎细胞因子(IL-1β,IL-6和IL-12 p70)和巨噬细胞浸润,并且还减少了促炎细胞因子和趋化因子mRNA表达,增加了受损肾脏中的抗炎细胞因子。除此之外,两周的硝酸盐补充降低了骨髓来源的巨噬细胞中的超氧化物产生和IL-6的表达。

研究结果表明,硝酸盐补充对肾脏IR的保护作用可能是通过调节氧化应激和炎症反应来介导的。硝酸盐补充或可作为肾脏IRI高风险患者的潜在治疗方法,有望进行一步探索。

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    2018-01-24 paperyu
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    2017-08-02 sunylz
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