网络首发:2016-10-14,
纸质出版:2016
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二氮嗪对心肺复苏后脑线粒体的影响[J]. 中山大学学报(医学科学版), 2016,37(5).
Effect of Diazoxide on Cerebral Mitochondrion after Cardiopulmonary Resuscitation[J]. Journal of Sun Yat-sen University (Medical Sciences), 2016, 37(5).
【目的】 探讨二氮嗪能否通过开放线粒体ATP敏感性钾通道(mitoKATP)起到抗氧化应激和保护线粒体的结构和功能,减轻缺血再灌注引起的脑细胞损伤。【方法】 经窒息诱导的心脏停搏(CA)和心肺复苏(CPR)成功的雄性Sprague-Dawley (SD)大鼠24只,恢复自主循环(ROSC)后30 min,用抽签法随机分为3组,每组8只,分别为载体(Vehicle)组:给予0.1 mol/L二甲基亚砜(DMSO) 1 mL腹腔注射;二氮嗪(DZ)组:给予DZ(10 mg/kg)腹腔注射(DZ溶解在0.1 mol/L DMSO 1 mL中,下组相同);DZ+5-羟基癸酸盐(DZ+5-HD)组:给予DZ(10 mg/kg)腹腔注射,同时给予5-HD(5 mg/kg)腹腔注射。另设假手术组(Sham)5只。手术后或复苏后24 h处死各组动物,取脑皮质进行丙二醛(MDA)、活性氧族(ROS)和超氧化物歧化酶2(SOD2)检测,提取线粒体测定呼吸控制率(RCR)和用电子显微镜观察脑皮质超微结构。【结果】 复苏后24 h脑组织MDA和ROS浓度升高,SOD2活性下降,RCR下降,线粒体结构出现损坏;DZ干预后MDA和ROS浓度下降,SOD2活性上升,RCR上升,线粒体结构得到保护;但经5-HD共同干预后DZ的保护作用被取消。【结论】 DZ通过开放mitoKATP通道可起到抗氧化应激损伤、保护线粒体结构和功能的作用,减轻复苏后脑损伤。
【Objective】 To investigate whether postresuscitation neuroprotective effects of diazoxide (DZ) is by opening mitochondrial ATP -sensitive potassium channel to anti -oxidative stress and to protect the mitochondria structure and function. 【Methods】 Asphyxias cardiac arrest and cardiopulmonary resuscitation (CPR) animal model were established in SD rats. Five male rats in sham group were only received sham operation but not induced cardiac arrest for control. After experienced cardiac arrest and CPR, 24 male rats that return of spontaneous circulation (ROSC) were randomly assigned to 3 groups (n=8) and followed by intraperitoneal injected of 0.1%dimethyl sulfoxide (DMSO)1 mL, DZ 10 mg/kg or DZ 10mg/kg co -treatment with 5 -hydroxydecanoate (5 -HD) 5mg/kg respectively. The brains were quickly excised after ROSC 24h. Methane dicarboxylic aldehyde (MDA) and reactive oxygen species (ROS) content and activity of manganese superoxide dismutase (SOD2) were also detected by ELISA. Mitochondrial respiratory control ratio (RCR) was detected; ultrastructure of brain cells was observed by Transmission Electron Microscopy. 【Results】 After resuscitation 24h, the contents of MDA and ROS of cerebral tissue of rat increased, activity of SOD2 decreased, RCR decreased and the ultrastructure of mitochondrial was damaged. After administration of DZ, the contents of MDA and ROS of cerebral tissue of rat decreased, activity of SOD2 increased, RCR increased and the ultrastructure of mitochondrial was integrity. But the effects of DZ were abrogated by co -treatmented with 5 -HD. 【Conclusion】 Diazoxide attenuates postresuscitation brain injury by opening mitochondrial ATP -sensitive potassium channel to anti -oxidative stress and to protect the mitochondria structure and function.
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