玄参活性部位对冠状动脉结扎致心室重构大鼠心肌纤维化的影响

目的:探讨玄参活性部位对冠状动脉结扎所致心室重构大鼠心肌纤维化的影响及其作用机制。方法:冠状动脉结扎法制备大鼠心室重构模型。14周药物干预后,测定大鼠左心室及全心肥厚指数,病理切片HE染色观察心肌细胞横断面面积,天狼星红染色观察心肌间质及血管周围胶原沉积情况,并分析Ⅰ型、Ⅲ型胶原的分布和含量,荧光RT-PCR测定心肌组织Ⅲ型胶原基因表达水平。结果:玄参活性部位能降低心肌肥厚指数,减小左心室心肌细胞的横断面面积,改善心肌纤维化和胶原沉积,显著降低Ⅲ型胶原mRNA表达水平。结论:玄参活性部位对心肌细胞和间质胶原沉积两方面都有显著的抑制作用,抗心室重构的作用机制可能与抑制Ⅲ型胶原mRNA表达有关。

动脉硬化疾病患者右室流出道起搏的探讨

目的探讨动脉硬化疾病患者适宜的起搏部位。方法7例(冠心病3例、高血压4例)置入翼状电极至右室心尖部后起搏及感知功能障碍的患者,重置螺旋电极至右室流出道,观察其前后的起搏及感知功能。结果7例右室流出道起搏的起搏阈值较右室心尖部起搏显著降低,感知阈值较右室心尖部显著升高(0.5±0.2Vvs8.7±1.6V,10.6±3.6mVvs2.7±0.8mV,P<0.01),阻抗无明显差异。随访16±6个月,无电极脱位,起搏感知功能良好。结论右室流出道可作为有动脉硬化病史患者的起搏部位。

美洲大蠊抗肝纤维化活性部位HPLC指纹图谱的建立及13种成分测定

目的:建立美洲大蠊抗肝纤维化活性部位(ML-HB)氨基酸类指纹图谱,评价不同批次ML-HB的质量,并测定氨基酸的含量。方法:采用盐酸水解法制备水解氨基酸样品液,领苯二甲醛柱前衍生化后进行HPLC分析。色谱柱为AgilentZORBAXEclipseXDB-C18(4.6mm×250mm,5μm);柱温35℃;检测波长338nm;流动相为甲醇-17.6mmol/L的磷酸二氢钠溶液(pH7.80),进行梯度洗脱。依据相似度评价、聚类分析和主成分分析结果进行不同批次ML-HB质量评价。结果:建立了10批ML-HB指纹图谱,标定共有峰15个,指认出13个峰,10批样品相似度均大于0.980;测定了10批样品中13种氨基酸的含量。结论:所建立的ML-HB氨基酸类指纹图谱及含量测定方法稳定性、重复性好,可为ML-HB的质量控制和评价提供参考。

正交试验优选美洲大蠊抗肺纤维化活性部位的提取工艺

目的:结合体外活性实验,优选美洲大蠊抗肺纤维化活性部位(ML-HB)的最佳提取工艺。方法:采用单因素实验和L_9(3~4)正交实验设计考察提取温度、溶剂浓度、提取时间、提取次数等因素对美洲大蠊抗肺纤维化活性部位(ML-HB)提取工艺的影响,并结合MTT取工艺。结果:料液比为1:5时(g/mL)最佳提取工艺为:提取温度为70℃,以70%的乙醇提取3次,提取时间为2.5 h/次。对此工艺进行验证,活性部位得率均值为0.59%,其24 h72.40、71.03和72.26μg/mL,72 h的IC_(50)值分别为67.24、69.76和67.22μg/mL。结论:建立了ML-HB的最佳提取工艺,为美洲大蠊抗肺纤维化的研发提供了依据。

Therapeutic potential and mechanism of Chinese herbal medicines in treating fibrotic liver disease

Liver fibrosis is a pathological condition characterized by replacement of normal liver tissue with scar tissue,and also the leading cause of liver-related death worldwide.During the treatment of liver fibrosis,in addition to antiviral therapy or removal of inducers,there remains a lack of specific and effective treatment strategies.For thousands of years,Chinese herbal medicines(CHMs)have been widely used to treat liver fibrosis in clinical setting.CHMs are effective for liver fibrosis,though its mechanisms of action are unclear.In recent years,many studies have attempted to determine the possible mechanisms of action of CHMs in treating liver fibrosis.There have been substantial improvements in the experimental investigation of CHMs which have greatly promoted the understanding of anti-liver fibrosis mechanisms.In this review,the role of CHMs in the treatment of liver fibrosis is described,based on studies over the past decade,which has addressed the various mechanisms and signaling pathways that mediate therapeutic efficacy.Among them,inhibition of stellate cell activation is identified as the most common mechanism.This article provides insights into the research direction of CHMs,in order to expand its clinical application range and improve its effectiveness.

美洲大蠊抗肝纤维化活性部位的筛选

目的结合体外活性筛选,对美洲大蠊提取物进行分离、纯化与活性追踪,以便获得抗肝纤维化活性较强部位。方法用5倍量95%,90%,80%,70%,60%,50%的乙醇溶液和水制备美洲大蠊冻干粉,分别命名为美蠊-A(ML-A)、美蠊-B(ML-B)、美蠊-C(ML-C)、美蠊-D(ML-D)、美蠊-E(ML-E)、美蠊-F(ML-F)、美蠊-G(ML-G)。将细胞分为3组:正常组、空白组(不含细胞)和给药组(美洲大蠊冻干粉溶液:1000,250,62.5,15.63,3.91,0.98μg·mL-1)。用MTT法对美洲大蠊不同溶剂提取物进行抗肝纤维化活性筛选,用HP20大孔树脂对筛选得到的活性部位进行分离与纯化,进行体外活性追踪。结果美洲大蠊提取物ML-D对HSC-T6细胞有一定的抑制作用,其48h的IC_50值为389μg·mL^(-1)。分离ML-D得ML-D_1、ML-D_2、ML-D_3、ML-D_4、ML-D_5、ML-D_6和ML-D_7洗脱部位,其中ML-D_5、ML-D_6、ML-D_7及其合并物ML-HB对HSC-T6细胞细胞的生长有良好的抑制作用,48h的IC_50值分别为115.6,116.5,121.8和110.0μg·mL-1。结论从美洲大蠊中提取分离得到活性部位ML-HB对HSC-T6细胞的增殖有较好的抑制作用。