机构地区:[1]武汉大学人民医院麻醉科,湖北武汉430060 [2]武汉大学人民医院心内科,湖北武汉430060 [3]武汉市妇女儿童医疗保健中心麻醉科,湖北武汉430016
出 处:《中华危重病急救医学》2018年第2期140-144,共5页Chinese Critical Care Medicine
基 金:国家自然科学基金(81772044);湖北省武汉市卫生计生委重点项目(WX17B09)
摘 要:目的探讨神经调节蛋白-1(NRG-1)对脓毒症大鼠心肌的保护作用及其可能机制。方法按照随机数字表法将健康雄性SD大鼠分为3组,每组6只。采用盲肠结扎穿孔术(CLP)建立脓毒症大鼠模型(CLP组);假手术组(Sham组)除不进行结扎、穿孔外,其余操作相同。NRG-1预处理组(NRG组)于制模前30 min经尾静脉注射重组人神经调节蛋白-1(rhNRG-1)10 μg/kg;CLP组和Sham组则给予等量生理盐水。于制模后24 h,测定各组大鼠血流动力学以评价心功能;用苏木素-伊红(HE)染色后观察心肌细胞形态学改变;用酶联免疫吸附试验(ELISA)检测血清中心肌肌钙蛋白T(cTnT)、肿瘤坏死因子-α(TNF-α)、白细胞介素-1β(IL-1β)以及心肌组织中巨噬细胞移动抑制因子(MIF)水平。结果 ①心功能:与Sham组比较,CLP组和NRG组平均动脉压(MAP)、左室收缩压(LVSP)、左室内压上升或下降最大速率(±dp/dt max)均明显降低,但NRG组血流动力学各指标均较CLP组明显升高〔MAP(mmHg,1 mmHg=0.133 kPa):125.78±8.15比113.05±5.85,LVSP(mmHg):151.27±6.79比139.39±8.05,+dp/dt max(kPa/s):4 389.59±332.38比3 706.85±451.31,-dp/dt max(kPa/s):4 291.42±323.72比3 691.17±515.44,均P〈0.05〕。②心肌损伤情况:与Sham组比较,CLP组和NRG组血清cTnT水平均明显升高,但NRG组cTnT明显低于CLP组(ng/L:206.37±67.28比344.13±80.95,P〈0.05);HE染色显示,NRG组大鼠心肌细胞病理形态学改变较CLP组有所改善。③炎性介质水平:与Sham组比较,CLP组和NRG组血清TNF-α、IL-1β及心肌MIF水平均明显升高,但NRG组各炎性介质水平均明显低于CLP组〔TNF-α(ng/L):52.77±3.43比97.19±13.98,IL-1β(ng/L):40.25±5.48比56.05±6.88,MIF(μg/L):1.92±0.16比2.87±0.10,均P〈0.05〕。结论NRG-1预处理可以明显降低脓毒症大鼠循环中炎性因子水平,调ObjectiveTo explore the protective effect of neuregulin-1 (NRG-1) on heart function and myocardium in rats with sepsis and its mechanism .MethodsHealthy male Sprague-Dawly (SD) rats were divided into three groups according to random number table method, with 6 rats in each group. Sepsis model was established by cecal ligation and puncture (CLP group); rats in sham operation group (sham group) underwent the same procedure except ligation. Rats in NRG-1 pre-treatment group (NRG group) were intravenously injected with recombinant human NGR-1 (rhNRG-1) at the dose of 10 μg/kg through tail vein; rats in CLP group and sham group were treated with the same amount of saline. At 24 hours after CLP, hemodynamic method was used to evaluate the cardiac function, and myocardial morphology was observed with hematoxylin and eosin (HE) staining, enzyme linked immunosorbent assay (ELISA) was used to detect the levels of cardiac troponin T (cTnT), tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β) in serum and macrophage migration inhibitor factor (MIF) in myocardial tissue.Results① heart function: compared with the sham group, the mean arterial pressure (MAP), left ventricular systolic pressure (LVSP) and left ventricular pressure maximal rate of rise and fall (±dp/dt max) were significantly decreased in CLP group and NRG group, while the MAP, LVSP and ±dp/dt max in NRG group were significantly higher than those in CLP group [MAP (mmHg, 1 mmHg = 0.133 kPa): 125.78±8.15 vs. 113.05±5.85, LVSP (mmHg): 151.27±6.79 vs. 139.39±8.05, +dp/dt max (kPa/s): 4 389.59±332.38 vs. 3 706.85±451.31, -dp/dt max (kPa/s): 4 291.42±323.72 vs. 3 691.17±515.44, all P 〈 0.05]. ②Myocardial injury: compared with the sham group, the levels of serum cTnT in CLP group and NRG group were significantly increased, while the levels of serum cTnT in NRG group were significantly lower than those in CLP group (ng/L: 206.37±67.28 vs. 344.13±80.95
关 键 词:神经调节蛋白-1 脓毒症 心功能 炎症 巨噬细胞移动抑制因子
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...