自发性高血压大鼠心室重构及脂联素受体1的表达

目的 观察自发性高血压大鼠(SHR)心室重构情况和心肌脂联素受体1(AdipoR1)及其mRNA的表达水平.方法 8只12w龄雄性自发性高血压大鼠为实验组(SHR组),8只12周龄雄性京都Wistar大鼠为对照组(WKY组).喂养12w后,各组大鼠分别超声心动图测定左室舒张末期内径(LVEDD)、室间隔厚度(IVST)、左室后壁厚度(LVPWT)、二尖瓣口舒张早期峰值流速(E峰)、舒张晚期血流峰值流速(A峰)并计算E/A比值;计算左室重量指数(LVWI);HE染色和Masson染色观察心肌组织形态学改变,并测定心肌胶原容积分数(CVF)和羟脯氨酸(Hyp)的含量;RT-PCR方法检测心肌组织AdipoR1 mRNA表达水平;Western印迹方法检测心肌组织AdipoR1蛋白表达水平.结果 与WKY组相比,SHR组IVST、LVPWT、LVWI均增大;LVEDD和E/A均减小;心肌细胞排列紊乱,间质成纤维细胞肥大增生,CVF和Hyp的含量均增多;AdipoR1 mRNA及AdipoR1蛋白表达均显著降低.结论 SHR大鼠有心室重构发生,心肌AdipoR1 mRNA和AdipoR1蛋白表达均水平下调,提示SHR大鼠心室重构发生与AdipoR1的变化有关.     

福辛普利对自发性高血压大鼠心室重构及血清脂联素、心肌脂联素受体1表达的影响

目的:观察自发性高血压大鼠(SHR)心室重构情况及血清脂联素(APN)、心肌脂联素受体1(AdipoR1)的表达,以及福辛普利干预后的变化,并探讨其意义。方法:以8只WKY大鼠和24只SHR大鼠为观察对象。将SHR大鼠随机分成SHR组、Fos10组、Fos20组,每组8只。从14周龄起,WKY组和SHR组给予蒸馏水灌胃,Fos10组和Fos20组分别给予福辛普利10mg·kg-1·d-1和20mg·kg-1·d-1灌胃干预。8周后,测定各组大鼠收缩压(SBP)、左心室重量指数(LVWI)、血清APN,荧光定量PCR和Western Blot法观察心肌AdipoR1的mRNA和蛋白的表达。结果:与WKY组相比,SHR组SBP升高、LVWI增加,血清APN、心肌AdipoR1表达下降(P0.05);与SHR组相比,Fos10组和Fos20组SBP、LVWI下降,血清APN、心肌AdipoR1表达上调,且Fos20组效果明显(P0.05)。结论:SHR发生心室重构,存在低APN血症并伴随心肌AdipoR1表达下降;福辛普利可能通过升高血清APN、上调心肌AdipoR1表达,来降低SHR的SBP水平,改善心室重构。     

替米沙坦和氯沙坦对胰岛素抵抗大鼠冠状动脉脂联素受体和胰岛素抵抗的影响

目的探讨替米沙坦和氯沙坦对胰岛素抵抗(IR)大鼠冠状动脉脂联素受体和IR的影响。方法将40只雄性SD大鼠随机分为对照组(Con组)、胰岛素抵抗组(IR组)、替米沙坦干预组[TEL组,5 mg/(kg·d)]和氯沙坦干预组[LOS组,10 mg/(kg·d)]。测定并比较各组大鼠空腹血糖、总胆固醇(TC)、三酰甘油(TG)和空腹胰岛素、血清脂联素(APN),并计算胰岛素敏感指数(ISI)。检测冠状动脉APN、脂联素受体1(AdipoR1)和脂联素受体2(AdipoR2)mRNA和蛋白的表达。结果与IR组比较,TEL组和LOS组血清APN水平均增加(P0.05),且TEL组TG水平、空腹血糖和ISI低于IR组(P0.05)。IR组冠状动脉APN mRNA、AdipoR1 mRNA、AdipoR2 mRNA表达低于Con组(P0.05),TEL组和LOS组冠状动脉APN mRNA、AdipoR1 mRNA、AdipoR2 mRNA表达较IR组增高(P0.05)。与IR组比较,TEL组和LOS组冠状动脉APN、AdipoR1和AdipoR2表达增加(P0.05)。结论替米沙坦和氯沙坦均能增加IR大鼠血清APN水平,抑制冠状动脉APN、AdipoR1和AdipoR2表达的下降。     

Effect and mechanism of Irbesartan on occurrence of ventricular arrhythmias in rats with myocardial ischemia through connexin43(cx43)

Objective: To explore the effect and mechanism of angiotensin Ⅱ receptor blockers-Irbesartan on occurrence of ventricular arrhythmias in rats with myocardial ischemia. Methods: Rats with embryonic cardiomyocytes-H9c2 were randomly divided into control group, ischemia group, Irbesartan group and Irbesartan+ischemia group. The cell viability of rats in each group was tested using MTT. Real-time PCR was employed to detect the expression of connexin43(Cx43) mR NA and western blot to detect the expression of Cx43 and phosphorylated Cx43. SD rats were randomly divided into the sham-operation group(SO), myocardial infarction group(MI), Irbesartan group and MI+ Irbesartan group, with 10 rats in each group. HE staining was employed to observe the change in the pathomorphology of left ventricular tissue and TUNEL method to analyze the cell apoptosis in the tissue. The immunofluorescence was adopted to observe the expression and distribution of Cx43 in the left ventricular myocardium and study the change in the expression of Cx43 in the cardiac muscular tissue at mR NA and protein level. Results: The intervention of Irbesartan in the condition of ischemia indicated the significant decrease in the number of necrotic cells. The expression of Cx43 was significantly decreased under the culture of ischemia(P0.05), but in the presence of Irbesartan, the expression of Cx43 was increased compared with the ischemia group(P0.01). The results of WB assay showed the similar trend of change at mRNA level. There was the significant difference in the score of ventricular arerythmia between MI group and SO group(P0.01). The incidence of ventricular tachycardia or ventricular fibrillation was significantly increased compared with the one in SO group(P0.05). There was the significant difference in the overall score between MI+Irbesartan group and MI group(P0.05). The expression of Cx43 in the cardiac muscular tissue in MI group was significantly decreased(P0.01 vs SO group). But the expression of Cx43 was increased after the treatment with Irbesartan. Conclusions: Irbesartan can inhibit the injury of H9c2 cardiomyocytes and the decreased expression of Cx43 that are induced by the ischemic myocardial infarction. Irbesartan can also improve the reconstruction of Cx43 in rats with ischemic myocardium to inhibit the myocardial infarction-induced arrhythmias.     

The Relation Between Hypertrophied Myocardium and Ventricular Fibrillation Threshold in Spontaneously Hypertensive Rats

Objectives To investigate the relation between hypertrophied myocardium and ventricular fibrillation threshold in spontaneously hypertensive rats (SHR). Methods 20 male SHR were randomly divided into two groups; 10 week group (n = 10) and 18 week group (n=10). 10 week male Wistar rats were controlled group (n=10). The systolic blood pressure (SBP), heart mass index (HMI), ventricular effective refractory period (VERP) and ventricular fibrillation threshold(VFT) were measured respectively. Results①The SBP and HMI of SHR were significantly higher than those of Wistar rats(P < 0.001). The VFT of SHR were significantly lower than that of Wistar rats (P < 0.001).②In SHR, the SBP and HMI of 18 week SHR were significantly higher than those of 10 week SHR (P< 0.001). The VFT of 18 week SHR were significantly lower than that of 10 week SHR (P < 0.001).③There were no significant difference of VERP among 10 week SHR, 18 week SHR and Wistar rats(P > 0.05).④There was no relationship between HMI and VFT or SBP in Wistar rats. There was significant relationship between HMI and VFT or SBP in different age spontaneously hypertensive rats.⑤HMI, age and species of animal were the major influent factors of VFT. Conclusions The VFT of hypertrophied myocardium decreased. The higher the degree of hypertrophy of myocardium and the higher the systolic blood pressure were, the lower the ventricular fibrillation threshold was.     

Effect of phentolamine on myocardial extracellular matrix of cardiac remodeling in rats

Objective:To study the effects of phentolamine on myocardial extracellular matrix of cardiac remodeling induced by norepinephrine in rats.Methods:24 SD rats were divided into 3 groups randomly:control groups,norepinephrine groups(model groups),norepinephrine +phentolamine groups(treatment groups).Echocardiography was used to detect changes in cardiac structure and function,the level of collagen volume fraction(CVF) and hydroxy-proline as well as collagen content were determined in myocardial tissue,matrix metalloproteinases-2 and collagen Ⅰin myocardial tissue were localized by immunohistochemitry.Results:Compared with control groups,left ventricular hypertrophy in the model group rats,the livdioxyproline content and CVF was significantly higher(P0.01),and matrix metalloproteinase- 2 and collagen Ⅰ protein expression was significantly increased(P0.01).Phentolamine significantly improved cardiac hypertrophy in treatment group rats,reduced hydroxy-proline,CVF,matrix metalloproteinase 2and collagen Ⅰ protein expression(P0.05).Conclusions:Phentolamine can effectively reduce the incidence of myocardial hypertrophy and myocardial extracellular matrix remodeling in SD rats,and it can ease myocardial extracellular matrix of cardiac remodeling.It may he associated with reduced expression of matrix metalloproteinase 2 and collagen Ⅰ in myocardial tissue remodeling.     

Effect of β blockers on β_3-adrenoceptor mRNA Expression in the Rats with Chronic Heart Failure

Objectives To investigate the changes of β3-adrenoceptor (β3-AR) mRNA expression in the rats with chronic heart failure (CHF), and to explore the effect of β blockers (βBs) on β3 mRNA expression. Methods Thirty-four rats were randomly divided into Sham group (n = 10) and heart failure group (n = 24). Rat model was established by aortic constriction. The survival rats in heart failure group were divided into heart failure control group (HF group, n = 6), metoprolol group (MET group, n = 8) and carvedilol group (CAR group, n = 8) three months after operation. Metoprolol tartarte was started orally with 12 mg·kg-1·d-1, carvedilol with 6 mg·kg-1·d-1, isometric saline was started in HF group. After three months of drug therapy, measurement of hemodynamics, index of ventricular mass, the level of β3-AR mRNA expression were performed. Results Compared with Sham group, left ventricular end systolic pressure (LVESP), and the absolute values of maximal rate of rise and fall ( ± dp/dtmax) of left ventricular pressure were all significantly decreased (P < 0.01), left ventricular end diastolic pressure (LVEDP) was significantly increased in HF group (P < 0.01). The hemodynamic parameters were improved by βBs, and carvedilol was more effective than metoprolol (P < 0.01). The index of ventricular mass was higher in HF group than MET group, CAR group and Sham group (P < 0.01). βBs significantly decreased the index of left ventricular mass (LVMI), and Carvedilol was more effective than metoprolol (P < 0.01). The index of right ventricular mass (RVMI) did not change in MET group (P > 0.05), but significant decrease could be seen in CAR group (P < 0.01). The level of β3-AR expression in left ventricle was greater than that in right ventricle whether in the failing heart or in the non-failing heart. Compared with Sham group, the level of β3-AR mRNA expression was significantly increased in HF group (P < 0.01). The levels of β3-AR mRNA expression showed a remarkable decrease in CAR group(P < 0.01), but was not seen in MET group. Conclusions The β3-AR expression level remarkably increases in the rat's left and right failing ventricles. Carvedilol is more effective on improving hemodynamics and attenuating ventricular remodeling than metoprolol in the rats with CHF. Carvedilol rather than metoprolol downregulates β3-AR expression in the rat's failing ventricles. The beneficial effect of carvedilol in CHF maybe partly due to the downregulation of β3-AR expression in the failing heart.     

Infuences of Previous Angina Pectoris on Coronary Collateral Circulation and Left Ventricular Function in Patients with Acute Myocardial Infarction

Objective To investigate the influences of previous angina pectoris on coronary collateral circulation and left ventricular function in patients with acute myocardial infarction. Methods 307 patients with a first episode acute myocardial infarction underwent selective coronary angiography and left ventriculography. The relation of previous angina pectoris to coronary collateral circulation, peak creatine kinase and left ventricular function were analyzed. Results ①In the 307 patients, there were 192 (62. 5 % ) with previous angina [PA (+) group] and 115 (37. 5 % ) without [PA (-) group].②The peak creatine kinase (CK) and CK MB were significantly higher in PA (-) group than in PA (+) group (P<0. 05 for both comparisons) . ③ Collateral circulation to infarct-related artery was more likely to be present in PA (+) group than in PA (-) group (P<0. 05) .④The left ventricular ejection fraction was significantly increased, and the left ventricular wall motion Cortina score decreased, in PA (+) group than in     

替米沙坦对自发性高血压大鼠左心室重塑的影响

目的探讨替米沙坦对自发性高血压大鼠(SHR)左心室重塑的影响。方法l6只16周龄雄性SHR,随机分为替米沙坦治疗组和SHR空白对照组;另设同源的WKY大鼠8只为正常对照组。治疗组给予替米沙坦10mg·kg-1·d-1灌胃给药,8周后处死动物,测量左心室心肌厚度并称重,计算左心室与体重比(LVW/BW);通过Van Gieson染色法观察左心室心肌胶原变化,对左心室心肌胶原容积分数(CVF)和血管周围胶原面积(PVCA)进行定性和半定量分析;电镜和HE染色观察左室心肌病理及超微结构。结果与WKY组相比,SHR空白对照组的尾动脉收缩压(SBP)、LVW/BW、左室壁厚度、CVF、PVCA、均显著增高(P<0.01);与SHR空白对照组相比,替米沙坦治疗组能有效降低SHR的SBP,改善左心室肥厚(P<0.01),减少心肌间质及心肌小动脉周围的胶原(P<0.01),组织病理及电镜显示,替米沙坦治疗能显著改善SHR左心室重塑。结论替米沙坦能有效降低SHR血压,改善左心室重塑。     

心肌脂联素信号通路增强可能是心肌缺血预处理保护心肌的部分新机制

目的 探讨脂联素(APN)信号通路在心肌缺血预处理中的作用及机制。方法 建立对照组,心肌缺血预处理(ischemic preconditioning,IPC)和缺血/再灌注(myocardial ischemia/reperfusion,MI/R)损伤小鼠模型,每组8只C57BL/6J小鼠。ELISA法检测血浆APN水平,超声检测心功能,TTC法观察心肌梗死面积,TUNEL染色检测心肌细胞凋亡,Western blot检测APN受体（adiponectin receptor,AdipoR）, 腺苷酸活化蛋白激酶(adenosine monophosphate activated protein kinase,AMPK)分子的表达。结果 与对照组血浆APN〔(19.08±2.15)μg/ml〕相比,IPC组和MI/R组缺血30 min后血浆APN水平降低（P<0.01）;与IPC组血浆APN〔(15.4±2.09)μg/ml〕相比,MI/R组血浆APN水平降至更低〔(13.95±1.75)μg/ml〕（P<0.05）;与对照组左室射血分数(76.37±7.24)相比,MI/R组和IPC组左室射血分数（57.15±7.32和66.37±6.09）均降低（P<0.05）;与MI/R组左室射血分数相比,IPC组左室射血分数升高（P<0.01）;与对照组左室短轴缩短率(52.13±4.80)相比,MI/R组和IPC组左室短轴缩短率（37±8.14和44.9±6.52）降低（P<0.01）;与MI/R组左室短轴缩短率相比,IPC组左室短轴缩短率升高（P<0.01）;与对照组左室舒张末内径〔(3.13±0.59)mm〕相比,MI/R组和IPC组左室舒张末内径增加〔(3.50±0.48)mm和(3.23±0.50)mm〕（P<0.05）;与MI/R组左室左室舒张末内径相比,IPC组左室舒张末内径减少（P<0.01）;与对照组左室收缩末内径（1.95±0.59）mm相比,MI/R组和IPC组左室左室收缩末内径增加分别为〔(2.26±0.48)mm和(2.15±0.21)mm〕（P<0.05）;与MI/R组左室左室收缩末内径相比,IPC组左室收缩末内径减少（P<0.01）;与对照组心肌梗死面积相比,MI/R组和IPC组心肌梗死面积增加（45.7±3.92,40.9±4.1）（P<0.01）;与MI/R组心肌梗死面积相比,IPC组心肌梗死面积增加减少（P<0.05）;与对照组TUNEL阳性细胞相比,MI/R组和IPC组TUNEL阳性细胞增加（12.16±1.93和8.96±1.49）（P<0.01）;与MI/R组TUNEL阳性细胞相比,IPC组TUNEL阳性细胞减少（P<0.05）;与对照组Caspase-3活力〔(1.93±1.82)nmol/(h·mg)〕相比,MI/R组和IPC组Caspase-3活力增加〔(5.82±2.72和4.68±2.31）nmol/（h·mg）〕（P<0.01）;与MI/R组Caspase-3活力相比,IPC组Caspase-3活力减少（P<0.05）;与对照组心肌AdipoR1的表达(0.86±0.26)相比,MI/R组和IPC组心肌AdipoR1表达减少（0.57±0.15和0.72±0.22）（P<0.05）;与MI/R组心肌AdipoR1的表达相比,IPC组心肌AdipoR1的表达增加（P<0.05）;而AdipoR2的表达没有变化;与对照组心肌pAMPK/AMPK的表达(1.6±0.24)相比,MI/R组和IPC组心肌pAMPK/AMPK的表达减少（1.04±0.13和1.28±0.13）（P<0.05）;与MI/R组心肌pAMPK/AMPK的表达相比,IPC组心肌pAMPK/AMPK的表达增加（P<0.01）。结论 缺血预处理减轻心肌再灌注损伤机制部分可能在于心肌APN/AdipoR/AMPK信号通路增强。     

二维斑点追踪技术评价老年重度退行性主动脉瓣狭窄并高血压患者左心室收缩功能

目的应用二维斑点追踪技术评价老年重度退行性主动脉瓣狭窄(AS)并高血压患者左心室心肌收缩功能的改变。方法收集LVEF>54%老年重度退行性AS患者58例,按照是否合并高血压,分为AS组28例和合并高血压组30例,收集健康体检者28例为对照组,检测血压和常规超声心动图数据,包括左心室舒张末期内径、左心室后壁厚度、室间隔厚度及左心室质量指数(LVMI);二维斑点追踪技术测量左心室整体收缩期峰值纵向应变(GLS)、圆周应变(GCS)、径向应变(GRS)及扭转角度(Rot)。结果合并高血压组收缩压、舒张压、Rot明显高于对照组和AS组(P<0.01)。对照组、AS组和合并高血压组室间隔厚度、LVMI、GCS逐渐增高,GLS逐渐减低(P<0.01)。AS组和合并高血压组左心室后壁厚度明显高于对照组(P<0.01),GRS明显低于对照组[(32.2±12.2)%,(29.2±9.6)%vs (41.7±11.3)%,P<0.01]。结论与LVEF>54%的老年重度退行性AS患者比较,合并高血压的老年重度退行性AS患者左心室心肌功能进一步减低。二维斑点追踪技术是一种评价心肌早期受损的敏感方法,为临床早期诊断和治疗提供依据。     

钙通道阻滞剂改善内质网应激抑制压力过负荷高血压大鼠的心肌重构

目的:研究在压力过负荷应激状态下钙通道阻滞剂拉西地平对内质网应激（endoplasmic reticulum stress,ERS）分子钙网蛋白（calreticulin,CRT）和细胞凋亡效应分子-12(caspase-12)在大鼠心肌组织中的表达及对心肌重构的影响。方法: 将30只雄性Sprague-Dawly(SD)大鼠随机分为3组,即假手术组(Sham组)、腹主动脉缩窄组（TAC组）及TAC＋拉西地平干预组（简称拉西地平组）,每组10只。通过颈动脉插管测定各组大鼠的血流动力学,心脏超声心动图检查左心室的形态结构。采用免疫组化染色法检测大鼠心肌中CRT及caspase-12蛋白的表达水平,TUNEL荧光染色法检测心肌细胞的凋亡率。结果: 与Sham组相比较,TAC组大鼠的平均动脉压(MAP)、室间隔厚度(IVST)、左室后壁厚度(LVPWT)、左室质量指数(LVWI)、CRT和caspase-12蛋白表达水平及心肌细胞的凋亡率比较,均有显著升高(P<0.01)。拉西地平组大鼠MAP、IVST、LVPWT、LVWI、CRT和caspase-12蛋白的表达水平及心肌细胞的凋亡率较TAC组明显下降(P<0.05)。结论: 内质网应激可能参与了压力过负荷高血压大鼠心肌重构的过程。钙通道阻滞剂拉西地平可能通过降低CRT及caspase-12的表达及减少心肌细胞的凋亡干预ERS介导的压力负荷所致高血压大鼠心肌肥厚的信号通路,从而通过改善内质网应激发挥对心脏的保护作用。     

结缔组织生长因子与高血压大鼠心肌纤维化相关性及伊贝沙坦的干预研究

目的探讨结缔组织生长因子(CTGF)在高血压大鼠心肌纤维化发生发展中的作用,以及伊贝沙坦改善高血压所致心室重构和心肌纤维化可能的作用机制。方法20只12周龄雄性自发性高血压大鼠(SHR)随机分为SHR组和伊贝沙坦(IRB)组各10只,IRB组每只大鼠予以伊贝沙坦50 mg.kg-1.d-1灌胃,给药时间12周,同时取10只12周龄雄性Wistar大鼠作为对照组(WKY组),用免疫组织化学的方法对转化生长因子β1(TGF-β1)、CTGF在3组大鼠的左室心肌的分布及表达进行半定量分析;用逆转录-聚合酶链反应检测TGF-β1、CTGF mRNA在心肌表达水平;用MOSSON染色法观察左室心肌胶原形态,图像分析测量胶原容积分数(CVF)和血管周围胶原面积(PVCA)。结果(1)左室重量指数(LVI)、CVF、PVCA在SHR大鼠组明显高于WKY大鼠组(P<0.01);与SHR组比较,伊贝沙坦组则显著降低(P<0.05)。(2)CTGF主要在血管平滑肌和心肌间质中表达,相关分析表明:CTGF与TGF-β1(r=0.562,P<0.05)、CVF(r=0.715,P<0.01)、PVCA(r=0.786,P<0.01)呈正相关;(3)CTGF及其mRNA在SHR组左室心肌中的表达较WKY组明显增强(P<0.05),与SHR组比较,IRB组则明显减少。结论高血压大鼠心室肌CTGF表达增加,伊贝沙坦能抑制高血压大鼠心室肌CGTF表达,且明显改善了高血压心室重构和心肌纤维化。     

高血压伴左心室肥厚与T波顶峰后宽度的关系

目的探讨高血压左心室肥厚(LVH)患者T波顶峰后宽度(TpTe间期)的改变及其临床意义。方法随机抽取2010-10-2011-06桂林医学院附属医院心内科住院的原发性高血压(EH)患者313例,根据超声心动图(UCG)测定的左心室质量指数(LVMI)分为LVH组和非LVH(NLVH)组。比较两组TpTe间期、校正TpTe间期(TpTec)、QT间期、校正QT间期(QTc)、QRS时限、LVMI、左心室舒张末期内径(LVEDD)、室间隔厚度(IVST)、左心室后壁厚度(LVPWT)的改变及其相互关系;比较不同血压水平对TpTe间期的影响;EH患者左心室不同构型TpTe间期改变的特点。结果与NLVH组比较,LVH组TpTe间期[(100.0±23.3)比(85.3±14.1)ms]、TpTec[(108.6±26.7)比(91.4±15.4)ms]、QTc[(435.0±23.6)比(420.0±23.5)ms]、QRS时限[(105.3±22.3)比(95.6±16.1)ms]均延长(均P<0.01),LVMI[(142.8±29.3)比(82.5±19.0)g/m2],LVEDD[(58.9±7.5)比(47.6±6.5)cm],IVST[(9.7±1.0)比(8.8±1.2)cm],LVPWT[(9.4±1.1)比(8.5±1.1)cm]明显增大(均P<0.01),QT间期延长,但差异无统计学意义。TpTe间期在不同左心室构型间的改变为:离心型肥厚>向心性肥厚>左心室游离壁肥厚>正常心室形态。Pearson相关分析表明,TpTe间期、TpTec与LVMI(r=0.43,0.44)、LVEDD(r=0.41,0.43)呈正相关(P<0.05)。多元线性回归分析显示,LVMI、LVEDD是TpTe间期重要的影响因素(β=0.026、0.280)。结论 TpTe间期可作为评价高血压伴左心室肥厚靶器官损害程度的心电学指标之一。     

Correlation between serum miR-122 and myocardial damage and ventricular function in patients with essential hypertension

BackgroundMyocardial damage and decreased ventricular function are risk factors leading to a bad prognosis in patients with essential hypertension (EH). MicroRNAs play important roles in myocardial function impairment in patients with hypertension. The purpose of our research was to investigate the correlation between serum miR-122 and myocardial damage and ventricular functions in EH patients.MethodsThe clinic data of EH patients (group A, n=60) and healthy individuals (group B, n=60) from December 2016 to December 2019 in our hospital were collected and analyzed. Serum miR-122, myocardial damage markers [B-type brain natriuretic peptide (BNP), homocysteine (Hcy), cardiac troponin T (cTnT) and creatine kinase MB isoenzyme (CK-MB)] and cardiac function indicators [ejection fraction (EF), left ventricular septal thickness (IVST), left ventricular isovolumic relaxation time (IVRT), left ventricular end-diastolic diameter (LVEDD), left ventricular posterior wall thickness (LVPWT), and left ventricular end-systolic diameter (LVESD)] were assessed in both groups. The correlation between serum miR-122 and myocardial damage markers and ventricular function indicators was analyzed.Results(I) The mean serum miR-122 concentration in group A and group B was 6.86±1.23 and 3.36±1.87 µmol/L, respectively. The serum miR-122 concentration in group A was evidently increased compared with that in group B. (II) The levels of BNP, Hcy, cTnT, and CK-MB in the peripheral blood in group A were evidently increased compared with those in group B (P<0.05). (III) EF and IVRT were evidently decreased in group A compared with that in group B (P<0.05). (IV) Serum miR-122 concentration was positively correlated with the myocardial damage markers BNP, Hcy, cTnT and CK-MB, and serum miR-122 concentration was negatively correlated with the ventricular function indicators EF and IVRT but not significantly correlated with other ventricular function indicators (IVST, LVEDD, LVPWT and LVESD).ConclusionsThe serum miR-122 concentration in EH patients was higher than that in healthy individuals, and miR-122 concentration was positively correlated with myocardial damage markers. Serum miR-122 level was negatively correlated with the ventricular function indicators EF and IVRT but was not significantly correlated with other ventricular function indicators (IVST, LVEDD, LVPWT, and LVESD).     

Hcy对高血压患者心肌重构的影响

目的:研究同型半胱氨酸(Hcy)对高血压患者心肌重构的影响。方法:根据血浆Hcy水平,2017年1月~2017年12月于我院治疗的92例高血压患者被分为H型高血压组(46例)和非H型高血压组(46例)。测量比较两组24h平均收缩压(24h mSBP)、24h平均舒张压(24h mDBP)、左房内径(LAD)、左室后壁厚度(LVPWT)、室间隔厚度(IVST)、左室舒张末期内径(LVEDd)及LVEF。结果:两组24h mSBP、24h mDBP、LAD、LVEDd、LVEF比较均无显著差异(P均>0.05)。与非H型高血压组比较,H型高血压组LVPWT[9.80(9.38,10.73)mm比13.40(12.40,14.30)mm]、IVST[9.70(9.23,10.63)mm比13.10(12.40,14.20)mm]均显著升高(P均=0.001)。结论:与非H型高血压者比较,H型高血压患者左室后壁厚度、室间隔厚度显著增厚,可能高血浆Hcy水平加剧了高血压患者心肌重构的进展。     

厄贝沙坦对SHR左心室肥厚和心肌纤维化的影响

目的 探讨厄贝沙坦对自发性高血压大鼠(SHR)左心室肥厚(LVH)和心肌纤维化的影响。方法 16只16周龄雄性SHR,随机分为厄贝沙坦治疗组和SHR空白对照组;另设同源的WKY大鼠8只为正常对照组。治疗组予厄贝沙坦15 mg/（kg·d）灌胃给药,8周后处死动物,测量左心室心肌厚度并称质量,计算左心室质量/体质量比(LVM/BM);通过Van Gieson染色法观察左心室心肌胶原变化,对左心室心肌胶原容积分数(CVF)和血管周围胶原面积(PVCA)进行定性和半定量分析;HE染色光镜观察左心室心肌病理变化。结果 与WKY组相比,SHR对照组的尾动脉收缩压(SBP)、LVM/BM、左心室壁厚度、CVF、PVCA、均显著增高(P<0.01);与SHR对照组相比,厄贝沙坦治疗组能有效降低SHR的SBP,改善LVH(P<0.01),减少心肌间质及心肌小动脉周围的胶原(P<0.01)。结论 厄贝沙坦可有效降低SHR血压,减轻心肌纤维化和LVH。     

脂联素及脂联素受体1的表达与糖尿病心肌病的关系

目的通过观察2型糖尿病(T2DM)大鼠脂联素(APN)及心肌脂联素受体1的表达情况,探讨其在T2DM心肌病发病过程中的作用。方法建立T2DM大鼠动物模型。采用双抗体夹心酶联免疫法检测血清及心肌APN水平,并采用免疫组化的方法测定心肌脂联素受体1(Adipo R1)的蛋白表达。结果与对照组比较,T2DM组血清和心肌APN水平下降,心肌Adipo R1蛋白的表达水平降低,差异均有统计学意义(P0.05)。相关性分析显示,T2DM组大鼠血清APN与血清胰岛素、稳态模型胰岛素抵抗指数呈负相关(r=-0.613,P0.05;r=-0.637,P0.05),心肌Adipo R1蛋白表达量与心肌APN呈正相关(r=0.89,P0.05),与HOMA稳态模型(HOMA-IR)及空腹胰岛素水平(FINS)呈负相关(r=-0.697,P0.05;r=-0.593,P0.05)。结论糖尿病心肌病大鼠血清及心肌APN水平下降,心肌Adipo R1蛋白表达下降,胰岛素抵抗可能在糖尿病心肌病的发病过程中起到作用。