附子多糖预防高胆固醇血症的作用及其对肝脏CYP7α-1表达的影响

目的: 探讨附子多糖(FPS)预防高胆固醇血症的作用及其对肝脏胆固醇7α-羟化酶(CYP7α-1)表达的影响。方法: SPF级雄性Wistar大鼠50只,体重100 g,随机分为正常组(control)、高胆固醇组(HC)和HC+附子多糖(HC+FPS)低、中、高3个剂量组,每组10只,分别给予正常、高胆固醇及高胆固醇加附子多糖(224、448和896mg·kg^-1·d^-1 )饮食,持续2周,检测各组的血脂水平;观察control组、HC组和HC+FPS(224 mg·kg^-1·d^-1)组大鼠的体重、进食量和粪便量的变化,实验结束后取3组大鼠的肝脏行HE染色;并检测3组大鼠肝脏羟甲基戊二酰辅酶A(HMG-CoA)还原酶mRNA水平、CYP7α-1 mRNA和蛋白水平以及粪便总胆汁酸含量等方面的改变。结果: 附子多糖能显著抑制高胆固醇血症大鼠血清中总胆固醇(TC)和低密度脂蛋白胆固醇(LDL-C)的水平(P<0.05);HC+FPS组大鼠肝细胞脂肪变性较HC组轻微;real-time PCR和Western blotting结果显示附子多糖能显著上调高胆固醇大鼠肝脏CYP7α-1 mRNA水平和蛋白表达并明显降低HMG-CoA还原酶的mRNA水平(P<0.01);HC组大鼠粪便中胆汁酸的含量增多而HC+FPS组进一步增加(P<0.05)。结论: 附子多糖具有明显的降血胆固醇作用,其机制与上调CYP7α-1 mRNA及蛋白水平和下调大鼠肝脏HMG-CoA还原酶mRNA水平有关。     

缺血预处理-后处理对大鼠肠缺血再灌注损伤的影响

Objective To evaluate the effects of ischemic preconditioning-postconditioning on the intestinal ischemia-reperfusion (IR) injury in rats. Methods Forty healthy male SD weighing 225-275 g were randomly assigned into 5 groups ( n = 8 each): group I sham operation (group S) ; group II intestinal IR (group IIR); group Ⅲ ischemic preconditioning (group Ipr); group IV ischemic postconditioning (group Ipo); group V Ipr+ Ipo. The rats were anesthetized with intraperitonel 20% urethane 5 ml/kg. Superior mesenteric artery (SMA) was occluded for 60 min followed by 60 min reperfusion. In group S, SMA was isolated but not occluded. In group Ipr, SMA was occluded for 10 min followed by 10 min reperfusion, and the rest procedures were performed using the method described in group IIR. In group Ipo, 60 min ischemia was followed by three 30 s episodes of ischemia at 30 s intervals for reperfusion. In group Ipr+ Ipo, Ipr was performed followed by Ipo and the procedures were performed using the methods described in group Ipr and Ipo. The animals were killed at 60 min of reperfusion. The intestinal tissues were immediately removed for determination of MDA content, SOD and MPO activities and the degree of damage to intestinal mucous membrane was scored according to Chiu score. Arterial blood samples were taken for determination of plasma concentrations of TNF-α and 1L-6. Results Compared with group S, Chiu score, MDA content, MPO activity, and plasma concentrations of TNF-α and IL-6 were significantly increased, whereas SOD activity decreased in the other 4 groups ( P < 0.05). Chiu score, MDA content, MPO activity, and plasma concentrations of TNF-α and IL-6 were significantly decreased, whereas SOD activity increased in group Ipr, Ipo and Ipr + Ipo as compared with group IIR ( P < 0.05). Chiu score and MDA content were significantly lower, whereas SOD activity higher in group Ipr + Ipo than in group Ipr and Ipo ( P < 0.05). No significant differences were detected in the indices between group Ipr and group Ipo ( P > 0.05). Conclusion Ischemic preconditioning-postconditioning can attenuate the intestinal IR injury in rats, and the efficacy is better than that of either Ipr or Ipo alone.     

缺血预处理-后处理对大鼠肠缺血再灌注损伤的影响

Objective To evaluate the effects of ischemic preconditioning-postconditioning on the intestinal ischemia-reperfusion (IR) injury in rats. Methods Forty healthy male SD weighing 225-275 g were randomly assigned into 5 groups ( n = 8 each): group I sham operation (group S) ; group II intestinal IR (group IIR); group Ⅲ ischemic preconditioning (group Ipr); group IV ischemic postconditioning (group Ipo); group V Ipr+ Ipo. The rats were anesthetized with intraperitonel 20% urethane 5 ml/kg. Superior mesenteric artery (SMA) was occluded for 60 min followed by 60 min reperfusion. In group S, SMA was isolated but not occluded. In group Ipr, SMA was occluded for 10 min followed by 10 min reperfusion, and the rest procedures were performed using the method described in group IIR. In group Ipo, 60 min ischemia was followed by three 30 s episodes of ischemia at 30 s intervals for reperfusion. In group Ipr+ Ipo, Ipr was performed followed by Ipo and the procedures were performed using the methods described in group Ipr and Ipo. The animals were killed at 60 min of reperfusion. The intestinal tissues were immediately removed for determination of MDA content, SOD and MPO activities and the degree of damage to intestinal mucous membrane was scored according to Chiu score. Arterial blood samples were taken for determination of plasma concentrations of TNF-α and 1L-6. Results Compared with group S, Chiu score, MDA content, MPO activity, and plasma concentrations of TNF-α and IL-6 were significantly increased, whereas SOD activity decreased in the other 4 groups ( P < 0.05). Chiu score, MDA content, MPO activity, and plasma concentrations of TNF-α and IL-6 were significantly decreased, whereas SOD activity increased in group Ipr, Ipo and Ipr + Ipo as compared with group IIR ( P < 0.05). Chiu score and MDA content were significantly lower, whereas SOD activity higher in group Ipr + Ipo than in group Ipr and Ipo ( P < 0.05). No significant differences were detected in the indices between group Ipr and group Ipo ( P > 0.05). Conclusion Ischemic preconditioning-postconditioning can attenuate the intestinal IR injury in rats, and the efficacy is better than that of either Ipr or Ipo alone.     

Ultrastructural Observation of Protective Effect of Sini Decoction（四逆汤）on Ischemic Myocardium

ＵｌｔｒａｓｔｒｕｃｔｕｒａｌＯｂｓｅｒｖａｔｉｏｎｏｆＰｒｏｔｅｃｔｉｖｅＥｆｆｅｃｔｏｆＳｉｎｉＤｅｃｏｃｔｉｏｎ（四逆汤）ｏｎＩｓｃｈｅｍｉｃＭｙｏｃａｒｄｉｕｍＷＵＷｅｉ－Ｋａｎｇ（吴伟康）；ＹＡＮＧＫｕｎ（杨昆）；ＷＵＪｉｎ－ｌａｎｇ（吴金...     

四逆汤对动脉粥样硬化家兔脂代谢及血管内皮功能的影响

目的观察四逆汤预防性用药对家兔实验性动脉粥样硬化（ＡＳ）脂代谢及血管内皮功能的影响,探讨四逆汤的抗ＡＳ作用及可能机制。方法运用图象分析法测定主动脉内膜脂质斑块面积百分比。脂代谢各指标分别运用酶动力学法、一步法、公式计算法、免疫透射比浊法等方法测定。血清一氧化氮（ＮＯ）及血浆内皮素（ＥＴ）分别用酶法及放射免疫法检测。结果四逆汤可明显缩小主动脉内膜脂质斑块面积,降低血清总胆固醇、甘油三脂、低密度脂蛋白－胆固醇、载脂蛋白Ｂ及血浆ＥＴ浓度,提高血清ＮＯ及载脂蛋白Ａ含量,四逆汤高剂量组效果为佳,呈一定的量效依赖关系。结论四逆汤具有较好的抗ＡＳ作用,其作用机制与调节脂代谢、保护血管内皮细胞功能等有关。     

四逆汤改善经皮冠状动脉成形术后心肌缺血和再灌注心律失常的临床研究

采用动态心电图对30例经皮冠状动脉成形术(PTCA)的病人进行术后监测,并检测血中超氧化物歧化酶(SOD)和丙二醛(MDA)浓度的自由基指标动态变化。结果显示:PTCA术服用四逆汤的术后心肌缺血程度和再灌注心律失常发生率比单纯PTCA术更为显著地改善(p<0.05),其机制在于四逆汤能升高SOD活性和降低MDA含量,减轻PTCA术后心肌缺血再灌注损伤。     

大防风汤颗粒剂质量控制的初步研究

研究目的是确定大防风汤颗粒剂的质量控制方法。采用TLC法对研制的大防风汤颗粒剂和国外的大防风汤颗粒剂中黄芪、苍术、白芍及牛膝进行定性鉴定 ,利用Rp HPLC法测定颗粒剂中乌头碱的含量。结果 :乌头碱在 0 2～ 1 5 μg范围内具有良好的线性关系 ,回收率平均值为 97 92 % ,RSD为 1 88%。结论 :研制的大防风汤颗粒剂的质量控制方法简便、可靠 ,重现性良好 ,可有效地控制颗粒剂的质量 ,而国外的大防风汤颗粒剂不适用于此方法进行质量控制。     

新型缺血再灌注模式诱导小鼠心肌细胞凋亡

目的 探讨联用垂体后叶素(以下简称Pit)及硝酸甘油(NG)造成缺血再灌注损伤,诱导小鼠心肌细胞凋亡的实验条件及有关机制.方法 以昆明种小鼠为实验对象,单纯经腹腔注入20μ/kg的Pit者为Pit组:30min后再注入10mg/kg的NG者为Pit和NG联用组,记录两组0,5,20,33,60min的心电图(以下简称ECG).80min取出小鼠心脏,用透射电镜及DNA琼脂糖胶电泳观察心肌凋亡的发生.结果 ECG表明在5min及33min前后,t波高度发生显著变化(P<0.05),电泳出现凋亡特征性梯带,电镜下可观察到染色体浓集、边聚等心肌细胞凋亡的特征性变化.结论Pit和NG联用能有效地诱导小鼠心肌凋亡,其机制可能与缺血再灌注损伤有关.     

抗心肌缺血中药实验研究进展

抗心肌缺血中药研究是现代中药药理研究的热点之一 ,2 0世纪 70年代以来国内外的中医、中西医结合研究人员 ,作了大量的研究工作 ,从中发现许多中药具有不同程度的抗心肌缺血作用 ,其作用机制各不相同 ,采用的缺血动物模型、观测指标及研究方法均各不相同 ,获得了不少有意义的成果 ;进入新世纪以来 ,本领域的研究方兴未艾 ,不断有大量的研究报道涌现 ,下面将近 2年来国内有关中药抗心肌缺血的实验研究报道作以下综述。1　中药单体研究中药单体的抗心肌缺血研究由于所得出的研究结果易为现代医学所接受 ,便于国际交流 ,多年来一直受到重视 ,…     

保心胶囊对急性心肌缺血犬一氧化氮和内皮素的影响

保心胶囊对急性心肌缺血犬一氧化氮和内皮素的影响