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黄芪多糖丹参酮对心衰大鼠心肌NF-κB通路过度激活及MIF表达的干预效应
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摘要
目的
     建立心衰大鼠模型,通过从分子生物学和细胞因子网络调控体系的角度,初步探讨CHF时心肌中NF-κB信号转导通路过度激活的作用机制,分析其与MIF、TNF-α、IL-6、TGF-β1等细胞因子的相关性;验证中药单体黄芪多糖联合丹参酮-IIA对NF-κB信号转导通路过度激活的阻断效应;并且从气虚血瘀证-免疫调节失衡-多层次多靶点的研究角度,探索益气活血中药对心衰大鼠的干预效应,.开发中药抗炎免疫调节有效成分,为临床治疗CHF降低心血管疾病的住院率探索新思路、新方法。
     方法
     1.心力衰竭动物模型的制备:采用冠状动脉结扎术方法,经过第2周饲料减半,第3周游泳,第4周超声多普勒心电图,测定左心室舒张末期内径(LVEDD)、左心室舒张末期容积(LVEDV)、射血分数(EF),计算左室心脏指数CI,建立心衰模型。
     2.分组与给药:将成模后大鼠纳入实验,分为黄芪多糖组(3g.kg-1.d-1,ig)、丹参酮组(5mg.kg-1.d-1,iv)、黄芪多糖+丹参酮组(剂量方法同上)、阿托伐他汀组(10mg.kg-1.d-1,ig)、模型组(等体积生理盐水,ig)、假手术组作为阴性对照(冠脉打虚结不结扎,从十二指肠予生理盐水,剂量方法同模型组),各用药组共干预6wk。
     3.观察心肌病理形态学变化:将大鼠采血处死,摘取心尖部心肌组织依次固定、脱水、石蜡包埋,行苏木精-伊红(HE)染色,光镜观察并评分
     4.免疫组织化学染色观察心肌组织NF-κB表达:采用图像分析系统半定量分析其表达量,并观察NF-κB激活时阳性表达核移位的情况。
     5.应用RT-PCR法检测心肌NF-κB和MIFmRNA含量的变化,并在此方法检测的基础上,加用荧光实时定量PCR法,测定目的基因基础量。
     6.采用Western blot法观察心肌NF-κB、IκB、IKK蛋白基因的表达,并采用LabWorks软件对图像进行灰度分析。
     7.采用ELISA法测定血清MIF、TNF-α、IL-6及TGF-β1的水平,并分析其相关性。
     8.应用SPSS17.0统计软件对数据进行分析处理。
     结果
     1.超声心动图结果显示,在术后第4周,对成模组大鼠和假手术组大鼠分别进行心脏超声检测,成模组大鼠的左心室舒张末期内径(LVEDD).左心室舒张末期容积(LVEDV)和射血分数(EF)均明显低于假手术组大鼠(P     2.病理形态学观察发现,模型组大鼠心肌核萎缩,室壁局部不规则,有坏死灶形成,心肌纤维数量减少,心肌横纹变浅,由胶原纤维形成的疤痕组织取代部分坏死灶,结缔组织增生明显,有大量炎性细胞的浸润;各用药组室壁破坏程度降低,残余心肌细胞增多,横纹较清晰,可见疤痕组织及少量炎细胞;与假手术组相比,模型组大鼠病理积分显著增高(P<0.05);各用药组病理积分均明显下降,与模型组相比有显著性差异(P<0.05);黄芪多糖+丹参酮组病理积分最低,与模型组相比具有显著性差异(P<0.05)。
     3.免疫组化定量分析,结果显示心肌组织存在NF-κB不同程度的激活,与假手术组比较,模型组心肌组织NF-κB表达的阳性密度明显升高,差异有统计学意义(P<0.05);与模型组比较,各用药组的阳性密度均明显降低(P<0.05);配伍组的阳性密度与单一用药组相比,差异有统计学意义(P<0.05)。
     4.RT-PCR法检测结果显示,模型组心肌NF-κB和MIFmRNA表达明显增高,各药物组对CHF大鼠心肌组织NF-κB和MIFmRNA表达有显著的抑制效应与假手术组相比,均具有显著性差异(P<0.05);黄芪多糖丹参酮配伍组的蛋白表达与黄芪多糖组、丹参酮组相比,差异具有显著性(P<0.05)。
     5.荧光实时定量PCR法结果显示,心肌组织NF-κB和MIFmRNA目的基因基础量分别为:假手术组(1)、(1),阿托伐他汀组(1.239)、(1.109),黄芪多糖+丹参酮组(1.453)、(1.515),黄芪多糖组(1.777)、(1.777),丹参酮组(1.986)、(2.219),模型组(2.345)、(2.602),提示各用药组NF-κB和MIFmRNA表达均显著降低,与假手术组相比具有显著性差异(P<0.05);黄芪多糖丹参酮配伍组NF-κB和MIFmRNA表达与单一用药组相比,具有显著性差异(P<0.05)。
     6.Western blot法检测心肌NF-κB、IκB、IKK的表达,结果显示:CHF模型组大鼠心肌组织NF-κB表达显著高于假手术组(P<0.05);各用药组NF-κB表达均比模型组减少(P<0.05);配伍组NF-κB表达比单一用药组低(P<0.05);然而,模型组心肌组织IκB、IκK表达比假手术组低(P<0.05);各用药组IκB、IκK表达比模型组高(P<0.05);配伍组IκB、IκK表达与单一用药组相比,明显增加,差异具有统计学意义(P<0.05)。
     7.ELISA法检测血清MIF、TNF-α、IL-6及TGF-β1表达的影响:模型组大鼠血清MIF、TNF-α、IL-6水平分别为(5.94±2.14)(420.36±67.57)(3704.44±1048.81),明显高于假手术组(0.23±0.08)(53.96±3.18)(352.40±87.20),均有显著性差异(P     8.CHF大鼠血清MIF水平与血清TNF-α、IL-6和TGF-β1的相关性分析显示,血清MIF水平与血清TNF-α、IL-6呈正相关(r1=0.879,r2=0.904,P<0.01);但是,TGF-β1与之趋势相反,血清MIF水平与血清TGF-β1呈负相关(r3=-0.602,P<0.01)。
     结论
     1.NF-κB作为信号传导途径中的枢纽,其激活途径主要与NF-κB由细胞质转运到细胞核内,同时伴随着抑制蛋白IKB及其最关键激酶IKK的降解呈负相关的密切关系,提示NF-κB信号转导通路在CHF发病中起重要作用。
     2.MIF在CHF大鼠血清和心肌组织中的表达均明显增多,并且血清MIF与TNF-α和IL-6呈正相关,而与血清TGF-β1呈负相关,提示MIF作为上游细胞因子在CHF发病中起着重要的免疫调节作用。
     3.黄芪多糖联合丹参酮-IIA的免疫调节治疗可纠正心衰大鼠的免疫状态调节炎症细胞因子与抗炎细胞因子间的平衡状态,具有明显的抗炎免疫调节活性,两者联用疗效优于单一用药组,对阻断大鼠心肌NF-κB转导通路过度激活及降低细胞因子MIF具有显著疗效,开发中药抗炎免疫有效成分的应用研究前景广阔。
Objective
     From the perspective of molecular biology and cytokine network, the mechanism of the action on NF-κB signal transduction pathway may control the system of CHF,myocardial excessive activation on the correlation between the level of serum MIF,TNF-α,IL-6,TGF-β1; To verify Astragalus polysaccharide Tanshin-one IIA does excessive activaton on NF-κB signal transduction pathway.Point of view that Qi asthenia and stagnation of blood-immunoregulation, to explore the intervention effection on benefiting vital energy and activating blood circulation of traditional Chinese medicine; To explore the intervention and anti-inflammatory immune active ingredients, it may provide a new method to reduce cardiovascular hospitalization rates of CHF.
     Method
     1. To set up animal models of CHF:Used the coronary artery ligation method,decreased the feed a half after two weeks, swam after three weeks, and then were made ultrasound Doppler ECG after4weeks.
     2. The SD rats were randomly divided into six experiment groups:APS group(3g.kg-1.d-1,ig),Tanshinone group(5mg.kg-1.d-1,iv),APS+Tanshinone group(dose as above),Atorvastatin group(10mg.kg-1.d-1,ig),model group(the volume of normal saline,ig),sham group as negative control(to play virtual nodes ligation of coronary artery,then were given normal saline to the duodenum by dose method),medicines were given for6wk.
     3. Myocardial pathomorphology was observed by light microscope.
     4. Immunohistochemistry was used to detect the expression of NF-κB in myocardial tissues.
     5. The levels of NF-κB and MIFmRNA in the myocardial tissues were measured by RT-PCR and fluorescent real-time quantitative PCR method.
     6. Western blot was used to detect the gene expression of NF-κB,IκB and IkK,and software LabWorks was used to analyze the gray image data.
     7. the levels of MIF,TNF-α,IL-6and TGF-β1in the serum were measured and analyzed the correlation by ELISA.
     8. SPSS17.0statistical software was used to analyze data.
     Result
     1. Echocardiography results showed that model group and sham group were detected by cardiac ultrasound after4weeks, respectively, left ventricular end-diastolic diameter(LVEDD),left ventricular end diastolicvolume(LVEDV) of model group were higher than sham group,and ejection fraction(EF) of model group was lower than sham group(P<0.01).
     2. Pathological results showed that in model group there were many myocardial nuclear shrinking wall of local irregular, necrotic fociformation, decreased myocardial fibers,lighter myocardial stripes,and some necrosis replaced by collagenfiber formation of scar tissue,marked hyperplasia of connective tissues, large inflammatory cell infiltration; Remarks of medication groups wall damage decreased,increased residual myocardial cells,clearer stripes,visible scar tissue and inflammatory cells;Pathologic score of model group was higher increased than sham group(P<0.05);Pathologic scores of medication groups were significantly lower than those of model group(P<0.05); Remark of APS+Tan group was the lowest(P<0.05).
     3. Immunohistochemistry showed that the expression of NF-κB in model group was higher than sham group(P<0.05); that of medication groups were lower than that of model group(P<0.05);that of matching group was lower than that of single medication group(P<0.05).
     4. RT-PCR assay results showed that the expressions of NF-κB and MIFmRNA in model group were significantly higher than medication groups; medication groups had much more inhibition than sham group(P<0.05); those of matching group were lower than those of single medication group(P<0.05).
     5. Fluorescent real-time quantitative PCR results show that the target gene basis of NF-κB and MIFmRNA:sham group(1),(1); Atorvastatin group(1.239),(1.109); APS+Tan group(1.453),(1.515); APS group(1.777),(1.777); Tan group (1.986),(2.219); model group(2.345),(2.602); those of medication groups decreased significantly than sham group(P<0.05); those of APS+Tan matching group were lower than those of single medication group(P<0.05).
     6. Western blot showed that the expression of NF-κB in model group was significantly higher than sham group(P<0.05); that of medication groups was lower than model group(P<0.05); that of matching group was lower than single medication group(P<0.05); but on the contrary,the expressions of IκB、IκK in model group were lower than sham group(P<0.05).
     7. The levels of MIF,TNF-α,IL-6in the serum by ELISA showed that those of model group were(5.94±2.14),(420.36±67.57),(3704.44±1048.81),which were higher than sham group(0.23±0.08),(53.96±3.18),(352.40±87.20)(P<0.05); those of medication groups were significantly lower than those of model group(P<0.05). but on the contrary,the level of serum TGF-β1showed an opposite tendency.
     8. Analysis of correlation between serum MIF、TNF-α、IL-6by ELISA showed that those of medication groups decreased significantly,and the level of serum MIF was positively correlated with those of serum TNF-α and IL-6(r1=0.879,r2=0.904, P<0.05),but the level of serum MIF was negative correlated with that of TGF-β1(r3=-0.602,P<0.05).
     Conclusions
     1. NF-κB as a hub in the signal transduction pathway released into the nucleus after activation,and accompanied by inhibition of IκB and degradation of most critical kinase IκK, all of which can suggest that NF-κB signal transduction pathway play an important role in CHF incidence.
     2. The levels of MIF in the serum and myocardial tissues of CHF rats significantly enhanced, and the expression of MIF, TNF-α and IL-6showed a positive correlation, but negatively correlation with those of serum TGF-β1, suggesting that as an upstream cytokine,MIF plays a key immunomodulatory role on onset of CHF.
     3. Astragalus polysaccharide joint Tanshinone-ⅡA immunomodulatory therapy can correct the immune status of CHF rats,regulating the equilibrium between inflammatory and anti-inflammatory cytokines,possessing significant anti-inflammatory and immunocompetence activity.Those of matching group were more effective than single medication group, blocking the overactivation of NF-κB transduction pathway,and MIF has shown a significant therapeutic curative effection.This study can provide a broaden prospect for anti-inflammatory immune and active ingredients of the traditional Chinese medicine in treating CHF.
引文
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