摘要
目的 探讨不同剂量6-姜酚(6-G)对大鼠心肌缺血-再灌注损伤(MIRI)的保护作用。 方法 将大鼠冠状动脉左前降支(LAD)结扎0.5 h制备大鼠MIRI模型。40只Sprague-Dawley(SD)大鼠随机分为5组:假手术组(Sham组)、MIRI对照组(I/R组)、6-G低、中、高剂量组,每组8只。Sham组仅开胸,不行LAD结扎;I/R组制作MIRI模型;6-G各组手术前0.5 h经尾静脉给不同剂量6-G(3、6、12 mg/kg)。各组大鼠经酶联免疫吸附法(ELISA法)检测血清白细胞介素(IL)-6、血清肿瘤坏死因子(TNF)-α、血清磷酸肌酸激酶(CK)、血清磷酸肌酸激酶-同工酶(CK-MB)和血清肌钙蛋白T(cTnT)水平。使用生物机能实验系统(BL-420S)采集射血分数(LVEF)、左心室缩短分数(LVFS)、左心室收缩压(LVSP)、左心室舒张末期压力(LVEDP)、等容收缩期左心室内压力上升/下降的最大速率(±dp/dtmax)。苏木精-伊红(HE)染色,光镜下观察心肌病理学变化。 结果 与Sham组比较,其余各组IL-6、TNF-α水平升高(P〈0.05);心肌酶(CK、CK-MB)和cTnT水平升高(P〈0.05);心功能指标LVEF、LVFS、LVSP、+dp/dtmax、-dp/dtmax降低(P〈0.05),而LVEDP升高(P〈0.05)。与I/R组比较,中剂量组IL-6[(34.80±5.10)pg/mL vs.(46.95±5.10)pg/mL]、TNF-α[(30.39±3.93)pg/mL vs.(40.46±3.39)pg/mL]水平降低(P〈0.05);CK[(1.35±0.02)mU/mL vs. (1.48±0.03)mU/mL]、CK-〖JP2〗MB[(1.980.41)ng/mL vs.(2.59±0.60)ng/mL]和cTnT[(117.00±13.67)pg/mL vs. (148.55±14.76)pg/mL]水平下降(P〈0.05);LVEF[(41.38±3.74)% vs.(30.00±4.69)%]、LVFS[(34.63±4.44)% vs.(21.25±4.43)%]、LVSP[(137.13±5.41)mm Hg vs.(124.75±4.17)mm Hg]、+dp/dtmax[(4323.25±398.17)mm Hg/s vs. (3530.36±245.02)mm Hg/s]、-dp/dtmax[(3188.38±248.06)mm Hg/s vs. (2395.25±315.60)mm Hg/s]升高(P〈0.05),而LVEDP[(2.310.58)mm Hg vs.(3.65±0.44)mm Hg]降低(P〈0.05);心肌组织损伤减轻。而低、高剂量组IL-6、TNF-α、心肌酶和cTnT、心功能指标变化差异无统计学意义(P〉0.05);心肌组织损伤未见显著减轻。 结论 中剂量6-姜酚(6 mg/kg)可减轻MIRI,其机制可能通过抑制炎症反应,保护心肌细胞,改善大鼠心脏功能。
Objective To investigate the protective effects of different doses of 6 - Gingerol on myocardial ischemia- reperfusiou injury (MIRI) in rats. Methods The rat MIRI model was prepared by ligation of left anterior descending coronary artery (LAD) in rats for 0.5 h. Forty Sprague - Dawley (SD) rats were randomly divided into 5 groups: sham operation group (Sham group), MIRI control group (I/R group), 6 -G low, medium and high dose groups, and each group consists of 8 mice. In the Sham group, only the thorax was opened and LAD ligation was not performed. The MIRI model was prepared in I/R group and administered via the tail vein (3, 6, 12 mg/kg) 0.5 h before surgery in 6 - G + MIRI group. Then we detected the levels of serum interleukin (IL) -6, serum tumor necrosis factor (TNF) -α, serum creatine phosphate kinase (CK) , serum creatine phosphate kinase isoenzyme (CK - MB) and serum troponin T (cTnT) by enzyme- linked immunosorbent assay (ELISA) in each group. The indexes of the left ventricular ejection fraction (LVEF), the left ventricular fractional shortening (LVFS), the left ventricular systolic pressure (LVSP), the left ventricular end -diastolic pressure (LVEDP), the maximum up/down rate of the left ventricular pressure ( + dp/dtmax) were collected by using a biological function system (BL -420S). Hematoxylin - eosin (HE) staining was used to observe the pathological changes of the myocardium under light microscope. Results Compared with the Sham group, the levels of IL -6, TNF -α, myocardial enzymes (CK, CK -MB) and cTnT were increased in other groups (P 〈 0.05 ). The cardiac function ( LVEF, LVFS, LVSP, + dp/dtmax, - dp/dtmax) was decreased (P 〈 0.05), while LVEDP increased (P 〈 0.05 ). Compared with I/R group, the middle - dose group significantly decreased the levels of IL-6[ (34.80 ±5.10) pg/mL vs. (46.95 ±5.10) pg/mL] and TNF - α ( 30. 39 ± 3.93 ) pg/mL vs. ( 40. 46 ± 3.39 ) pg/mL ] ( P 〈 0.05 ), decreased serum the levels ofCK[(1.35±0.02) mU/mLvs. (1.48±0.03) mU/mL], CK-MB[(1.98 ± 0.41) ng/mL vs. (2.59±0.60) ng/mL], cTnT[(117. 00±13.67) pg/mL vs. (148.55 ±14.76) pg/mL] (P 〈0.05), increased cardiac function LVEF (41.38 ± 3.74)% vs. (30.00±4.69)% ], LVFS[(34.63±4.44)% vs. (21.25±4.43)%, LVSP[(137.13±5.41) mmHgvs. (124.75 ± 4.17) mm Hg], + dp/dtmax [ (4323.25 ± 398.17 ) mm Hg/s vs. (3530.36 ± 245.02) mm Hg/s ], and - dp/dtmax[ (3188.38 ±248.06) mm ng/s vs. [ (2395.25 ±315.60) mm Hg/s] (P 〈0.05), while LVEDP [ (2.31 ±0.58 ) mm Hg vs. ( 3.65 ±0.44) mm Hg ] decreased ( P 〈 0.05 ). Myocardial tissue damage was reduced. There was no significant difference in the levels of IL - 6, TNF - α, myocardial enzymes, cTnT, cardiac function in the low and high dose groups ( P 〉 0.05 ) and myocardial tissue damage was not significantly alleviated. Conclusion The middle - dose group can reduce MIRI. The mechanism may be through inhibiting inflammatory reaction, protecting cardiomyocytes and improving cardiac function in rats.
作者
赵位昆
徐彤彤
吕祥威
武琦
覃秋语
Zhao Wei-kun;Xu Tong-tong;Lu Xiang-wei;Wu Qi;Qin Qiu-yu(The Department of Integrated TCM and Western Medicine Health Care Ward,Affiliated Hospital of Guilin Medical University,Guilin 541001,China)
出处
《中国急救医学》
CAS
CSCD
北大核心
2018年第11期991-995,I0002,共6页
Chinese Journal of Critical Care Medicine
基金
国家自然科学基金资助项目(81760861)
桂林市科学研究与技术开发计划项目(20160226-1-1)
广西研究生教育创新计划项目(YCBZ2017034)