实验动物科学 ›› 2018, Vol. 35 ›› Issue (03): 7-.

• 研究报告 • 上一篇    下一篇

姜黄素预处理对干热环境热射病大鼠心肌保护作用的研究

  

  1. 新疆军区总医院新疆特殊环境医学重点实验室,乌鲁木齐 830000
  • 出版日期:2018-06-28 发布日期:2020-08-28

The Protectvie Effects of Curcumin Pretreatment on the Myocardial of Heat Stroke Rats in Dry Heat Environment

  • Online:2018-06-28 Published:2020-08-28

摘要: 目的 探讨姜黄素预处理对沙漠干热环境热射病大鼠心肌损伤的保护作用。方法 选择SPF级6~8周龄雄性SD大鼠50只,将50只SD大鼠随机分为5组(n=10):常温对照组(NC),干热对照组(DHC),姜黄素50 mg/kg体质量预处理组(L-cur),姜黄素100 mg/kg预处理组(M-cur),姜黄素200 mg/kg预处理组(H-cur)。NC、DHC组给予生理盐水灌胃,姜黄素预处理组给予不同浓度的姜黄素灌胃,每天1次,连续7 d。第8天除NC组外,其余4组大鼠转移至西北特殊环境人工实验舱内进行实验,环境温度(41±0.5)℃,湿度(10±1)%。实验的第150分钟达到热射病状态,麻醉后取材。用全自动生化检测仪检测大鼠血清心肌酶CK(磷酸肌酸激酶)、CK-MB(肌酸激酶同工酶)、LDH(乳酸脱氢酶)的变化,HE染色法观察心肌病理学变化,用电子显微镜观察心肌超微结构变化。结果 干热对照组大鼠血清心肌酶CK、CK-MB、LDH 较常温对照组显著升高(P<0.01),姜黄素预处理组CK、CK-MB、LDH 均随药物浓度增加而降低,姜黄素各个预处理组之间差异具有显著性(P<0.01)。HE染色结果提示:干热对照组心肌组织随热暴露时间延长充血、出血现象逐渐加重,姜黄素干预组使心肌组织充血、出血得到缓解,尤以高浓度组明显。电子显微镜结果显示:DHC组心肌细胞线粒体肿胀,线粒脊结构紊乱,部分肌丝断裂,部分线粒体排列不规则,并随热暴露时间延长,心肌细胞损伤逐渐加重;姜黄素干预组心肌细胞线粒体结构较完整,胞核膜清晰,核仁数量较多,Z线较为清晰,排列较为规则,干预效果明显。结论 姜黄素预处理对沙漠干热环境下热射病大鼠的心肌损伤具有保护作用,其作用效果与姜黄素浓度有关。

关键词: 姜黄素, 干热环境, 热射病, 心肌损伤, 保护作用

Abstract: Objective To investigate the protective effects of curcumin pretreatment on myocardial injury of heat stroke rats in the dry heat environment. Method Fifty SPF 6-8 weeks old male SD rats were randomly divided into five groups (n=10):normal temperature control group (NC group), dry heat control group (DHC group), 50 mg/kg curcumin pretreatmet group (L-cur group), 100 mg/kg curcumin pretreatment group (M-cur group) and 200 mg/kg curcumin pretreatment group (H-cur group).The NC and DHC group were given a gavage of normal saline, while curcumin pretreatment group were given a gavage of curcumin with different concentration once a day for 7 consecutive days. At 8th day, all except for NC group were transferred to the climate cabin (The Simulated Climate Cabin for Special Environment of Northwest of China) with the conditions of (41±0.5) °C temperature, (10±1) % relative humidity. At the time of 150th minute since the experiment began, the rats were in heat stroke states, And same done to Control group.The changes of serum myocardial enzyme CK(phosphocreatine kinase),CK-MB(creatine kinase) and LDH(lactate dehydrogenase) were detected by automatic biochemical detector.The pathological changes of myocardium were observed by HE staining.Ultrastructural changes of myocardium were observed by electron microscopy. Result The serum myocardial enzymes CK, CK-MB and LDH in the DH group were significantly higher than those in the NC group (P<0.01).Curcumin intervention group CK, CK-MB and LDH in curcumin pretreatment groups were all decreased with the increase of curcumin concentration,and they had significant differert (P<0.01).HE staining result suggest:The myocardial tissue in the dry heat control group increased with the time of thermal exposure, and the bleeding gradually increased.The curcumin pretreatment group reduced the hyperemia and hemorrhage of myocardial tissue, especially in the high concentration group.The result of the electron microscope show that: Myocardial cell mitochondria swelled, structure of mitochondrial cristae appeared disorder, and partial myofilament fractured.Some of the mitochondria arranged irregularly, myocardial cell injury gradually increased with the thermal exposure time;The mitochondrial structure of myocardial cells in curcumin pretreatment groups were more complete, with clear cytoplasmic membrane and a large number of nucleoli,the Z line were clearer, the arrangement were more regular, the intervention effects were obvious. Conclusion Curcumin preteatment had protective effect on the myocardial injury of the heat stroke rats in the dry heat environment, and the effects appeared dose dependent.

Key words: Curcumin, dry heat environment, heat stroke, myocardial injury, protective effect