Panax notogiseng saponin inhibits ischemia-induced apoptosis by activating PI3K/Akt signal pathway in cardiomyocytes

The panax notoginseng saponin(PNS) had been clinically used for the treatment of cardiovascular diseases and stroke in China.It had been demonstrated that PNS could protect cardiomyocytes from injury induced by ischemi- a,but the underlying molecular mechanisms of this protective effect were still unclear.This study was aimed to investigate the protective effect and molecular mechanisms of PNS on apoptosis in H9c2 cells in vitro and rat myocardial ischemia injury model in vivo.Annexin-V/PI assay shew that PNS could protect H9c2 cells from apoptosis induced by serum, glucose and oxygen deprivation(SGOD) in a dose-dependent manner.However,the anti-apoptotic effect of PNS was reversed by LY294002,a specific PI3K inhibitor.This antiapoptotic effect of PNS was confirmed by JC-1,a specific probe of mitochondrial membrane potential staining.PNS could significantly increase phos-Akt in H9c2 cells by Western blot assays and its effect could be inhibited by LY294002.Furthermore,PNS could improve ischemic-induced left ventricular function as reflected by EF,LVDd and LVDs.PNS could also inhibited cellular apoptosis in myocardial tissues in ischemic rats by TUNEL assay.PNS administration also increased the expression of phos-Akt in rat ischemic myocardial tissues.These results suggested that PNS could protect myocardial cells from apoptosis induced by ischemia in vitro model and in vivo model through activating-PI3K/Akt signal pathway which may be meaningful for further understanding the molecular mechanisms of cardiac protection of PNS.And the results might be useful in treatment of myocardial ischemia in future.

三七预防糖尿病大鼠视网膜微血管病变的实验研究

目的探讨早期口服三七对糖尿病大鼠视网膜微血管病变的影响。方法 60只SD大鼠随机平均分成4组,A:正常大鼠生理盐水组;B:正常大鼠三七组;C:糖尿病大鼠生理盐水组;D:糖尿病大鼠三七组。C、D组尾静脉注射20 g·L-1STZ(55 mg·kg-1)制作糖尿病模型成功后三七治疗组每天按400 mg·kg-1三七粉灌胃给药一次,生理盐水组每天给予等量的生理盐水灌胃,12周后检测各组大鼠血液流变学、视网膜血管渗透性和毛细血管周细胞数目等指标。结果 A组、B组各项指标差异无统计学意义(P>0.05);与A组和B组相比,C组和D组大鼠出现明显的血小板黏附率、聚集率升高、视网膜血管渗透性增加、毛细血管周细胞数目减少(P<0.01);D组较C组糖尿病大鼠的视网膜渗透量降低了26.13%,差异有显著统计学意义(P<0.01)。D组糖尿病大鼠较C组糖尿病大鼠的周细胞计数降低了24.14%,但差异无统计学意义(P>0.05)。经三七治疗的D组糖尿病大鼠血小板黏附率(33.02±2.10)%、血小板聚集率(74.83±3.71)%,与C组(40.50±3.62)%和(84.00±6.48)%相比明显下降(P<0.05)。结论三七可降低糖尿病大鼠血黏度,减少视网膜血管渗透性,保护毛细血管结构,对早期糖尿病大鼠视网膜微血管病变具有一定的防治作用。

三七粉末透皮吸收研究

目的 :研究三七粉末的透皮吸收性及选择最佳促透剂。方法 :设计体外离体透皮试验法 (即用离体鼠皮在单室扩散池中进行试验 ) ,测定不同时间三七粉末中有关成分的透皮总量 (以三七皂苷为对照 ) ,计算透皮吸收率及促透剂的促透倍数。结果 :三七粉末的丙二醇溶液有一定透皮吸收能力 ,不同浓度的氮酮 (Azone)对其具有显著的促透作用 ,但Azone的促透效果与其剂量不呈直线关系 ,5 %Azone效果好于 7%Azone。结论 :本方法简便、易于操作、重现性较好 。

正交设计筛选三七皂苷单体最佳组合及对血管内皮保护作用评价

目的:利用正交实验筛选出三七皂苷单体最佳组合并观察其对氧化低密度脂蛋白(Ox-LDL)损伤血管内皮细胞的保护作用。方法:体外培养人脐静脉内皮细胞(HUVEC),加入100mg.L-1OX-LDL诱导单核-内皮细胞黏附,蛋白染料法测定黏附值,通过正交试验设计筛选出三七皂苷单体最佳组合;比色法检测乳酸脱氢酶(LDH)的释放量;硝酸还原法和放射免疫法分别测定HU-VEC培养上清液中一氧化氮(NO)、内皮素(ET)含量。结果:获得最佳PNS单体组合为:Rg1:Rb1:R1为1:10:1(Rg110-5mol/L、Rb110-4mol/L、R110-5mol/L),最佳单体组合显著降低LDH及ET水平,提高NO含量(P<0.01)。结论:由正交实验设计筛选出的最佳单体组合对OX-LDL所致的血管内皮细胞损伤有显著的保护作用。