持续输注异丙肾上腺素对早期脓毒症大鼠心肌线粒体的保护作用及其机制  被引量:2

Protective effect of continuous intravenous infusion of Isoproterenol on myocardial mitochondria of early septic rats and the corresponding mechanism

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作  者:谢美燕[1] 项丹[1] 吕娟娟[1] 郑贵浪[1] 黄锦达 刘翠[1] 曾其毅[1] 

机构地区:[1]南方医科大学珠江医院儿科,广州510282

出  处:《中华实用儿科临床杂志》2015年第6期425-428,共4页Chinese Journal of Applied Clinical Pediatrics

基  金:广东省科技计划项目(20108031600238);广州市科技计划项目(2010J-E421)

摘  要:目的探讨持续输注不同剂量异丙肾上腺素(ISO)对早期脓毒症大鼠心肌线粒体的保护作用及其机制。方法30只SD雄性大鼠按随机数字表法分为5组(每组各6只):对照组,内毒素组和ISO低、中、高剂量组。内毒素组腹腔注射脂多糖(LPS)10mg/kg同时持续输注9g/L盐水1mL/h;ISO低、中、高剂量组腹腔注射LPS10mg/kg同时分别持续输注IS00.06、0.30和0.60μg/(kg·min);对照组腹腔注射同时持续输注与其他组等体积的9g/L盐水。腹腔注射9g/L盐水或LPS后24h检测血清肌酸激酶(CK)和肌酸激酶同工酶(CK-MB)、心肌线粒体氧化氮化应激水平和线粒体肿胀度,并观察心肌组织病理改变(HE染色)和线粒体形态学改变。结果与对照组比较,内毒素组CK、CK-MB、一氧化氮(NO)含量、诱导型一氧化氮合酶(iNOS)活力和丙二醛(MDA)含量均升高(P均〈0.05),超氧化物歧化酶(SOD)活力降低[(11.543±1.080)U/mgprot比(9.892±0.815)U/mgprot,P〈0.05];HE染色示心肌组织呈炎症改变;线粒体超微结构异常(线粒体肿胀等)。ISO干预使CK和CK—MB水平及心肌线粒体肿胀度降低(P均〈0.05),SOD活力升高(P均〈0.05);低剂量组NO含量、iNOS活力和MDA含量降低[(10.823±2.240)μmol/gprot比(7.917±2.203)μmol/gprot,(0.045±0.008)U/mgprot比(0.033±0.003)U/ragprot,(1.663±0.618)mmol/mgprot比(0.768±0.312)mmol/mgprot,P均〈0.05],中、高剂量组iNOS活力和MDA含量升高(P均〈0.05);与中剂量组相比,高剂量组肿胀度升高(1.160±0.186比1.393±0.128,P〈0.05)。结论脓毒症早期大鼠心肌和心肌线粒体受损,持续低剂量ISO输注对心肌线粒体具有保护作用,其机制可能与氧化氮化应激水平降低有关。Objective To investigate the protective effect of continuous intravenous infusion of Isoproterenol (ISO) on myocardial mitochondria of early septic rats and the corresponding mechanism. Methods Thirty Sprague Dawley (SD) rats were randomly divided into 5 groups (6 cases per group) : control group, endotoxin group, ISO small - dose group, ISO medium - dose group and ISO large - dose group. Endotoxin group and ISO intervene group received same management apart from drug intervention : receiving intravenous injection of lipopolysaccharide ( LPS ) 10 mg/kg followed by an continuous intravenous infusion of 9 g/L saline 1 mL/h or ISO 0. 06 μg/( kg ·min ), 0.30 μg/( kg ·min)and 0.60 μg/( kg , min). Control group received intraperitoneal injection and continuous intrave- nous infusion with the same amount of 9 g/L saline. The primary endpoint of the study was 24 hours after injection of 9 g/L saline or LPS. Serum creatine kinase (CK) and creatine kinase isoenzyme ( CK - MB) , oxidative and nitrosative stress levels and swelling of isolated heart mitochondrion were detected. The pathological changes of the myocardium and morphologic changes of the heart mitochondria were observed through light microscope and scanning electron micro- scope,respectively. Results The levels of CK, CK - MB, nitric oxide (NO) content, inducible nitric oxide synthase (iNOS) activity and malondialdehyde (MDA)content in endotoxin group were increased compared with control group ( all P 〈 0. 05 ), while the superoxide dismutase ( SOD ) activity decreased [ ( 11. 543 ± 1. 080 ) U/mg prot vs (9. 892 ± 0. 815 ) U/mg prot, P 〈 0.05 ]. The morphology of the heart mitochondria significantly changed ( such as swelling, disordered arrangement, crest fracture, fusion and cavitations, and so on). ISO intervention significantly decreased the levels of CK, CK - MB and mitochondrial swelling ( all P 〈 0.05 ) and increased the SOD activity ( all P 〈 0.05). The levels

关 键 词:异丙肾上腺素 脂多糖 脓毒症 氧化应激 线粒体 

分 类 号:R459.7[医药卫生—急诊医学]

 

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