The protective effect of picroside II against hypoxia/reoxygenation injury in neonatal rat cardiomyocytes

Context: Picroside II, an iridoid glucoside found in the root of Picrorhiza scrophulariiflora Pennell (Scrophulariaceae), has been demonstrated to possess potent antioxidant activity. However, whether picroside II has a protective effect against hypoxia/reoxygenation (H/R)-induced cardiomyocyte injury is poorly understood.

Objective: To explore the cardioprotective role of picroside II against oxidative stress induced by H/R injury in neonatal rat cardiacmyocytes.

Materials and methods: The viability and cellular damage of cardiomyocytes were assessed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolim bromide (MTT) and lactate dehydrogenase (LDH) assays, respectively. The activities of superoxide dismutase (SOD) and glutathione peroxidase (GSH-Px), the levels of reduced (GSH) and oxidized glutathione (GSSG), and the contents of malondialdehyde (MDA) were determined by a colorimetric method. The levels of intracellular reactive oxygen species (ROS) and calcium were evaluated by flow cytometric analysis.

Results: We analyzed the effective half-maximal concentration for protection from the dose-response curves and obtained the concentration of 50 µg/mL as EC₅₀. Pretreated cardiomyocytes with picroside II (50–200 µg/mL), prior to H/R exposure, inhibited LDH activity in culture media and increased cell viability in a dose-dependent manner. This protective effect was accompanied by significantly increasing reduced GSH contents and the activities of SOD and GSH-Px and attenuating MDA and GSSG contents in response to H/R injury. Furthermore, treatment with picroside II also inhibited ROS production and calcium accumulation in cardiomyocytes.

Discussion and conclusion: The present study demonstrates that picroside II protects cardiomyocytes against oxidative-stress injury induced by H/R through reduction of ROS production and calcium accumulation and enhancement of the activity of antioxidant defense.     

二氢石蒜碱对大鼠乳鼠培养心肌细胞缺氧/复氧损伤的保护作用

目的观察二氢石蒜碱(dihydrolycorine,DL)对Wistar大鼠的乳鼠培养心肌细胞缺氧/复氧损伤(H/R)的保护作用。方法采用培养的Wistar乳鼠的心肌细胞,建立H/R损伤模型,检测指标包括:①心肌细胞存活率;②超氧化物歧化酶(SOD)活性;③丙二醛(MDA)含量;④乳酸脱氢酶(LDH)活性。结果模型组缺氧后心肌细胞存活率降低,复氧后进一步下降,各个时间点细胞内SOD活性下降,MDA含量升高,乳酸脱氢酶(LDH)活性升高,与正常组比较差异具有显著性(P<0.01);在DL1、10、100μmol·L-1组,随着给药浓度的增加,细胞存活率升高,LDH活性变低,MDA含量逐渐趋于恢复正常,SOD活性逐渐回升,表明经DL干预之后,心肌细胞抗损伤能力加强,发生损伤的程度减轻。结论DL对培养的乳鼠心肌细胞H/R损伤具有保护作用,其作用在一定范围内呈剂量依赖关系,机制可能与其阻断α、β受体、抑制心肌细胞脂质过氧化反应有关。     

Safflor yellow A protects neonatal rat cardiomyocytes against anoxia/reoxygenation injury in vitro

Aim:

To investigate the effects of safflor yellow A (SYA), a flavonoid extracted from Carthamus tinctorius L, on cultured rat cardiomyocytes exposed to anoxia/reoxygenation (A/R).

Methods:

Primary cultured neonatal rat cardiomyocytes were exposed to anoxia for 3 h followed by reoxygenation for 6 h. The cell viability was measured using MTT assay. The releases of lactate dehydrogenase (LDH) and creatine kinase (CK), level of malondialdehyde (MDA), and activities of glutathione (GSH), superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px) were analyzed. Hoechst 33258 staining and changes in Bcl-2/Bax ratio and caspase 3 activity were used to examine A/R-induced apoptosis.

Results:

The A/R exposure markedly decreased the viability of cardiomyocytes, suppressed the activities of SOD, GSH, CAT and GSH-Px, and Bcl-2 protein expression. Meanwhile, the A/R exposure markedly increased the release of LDH and CK, and MDA production in the cardiomyocytes, and increased the rate of apoptosis, caspase 3 activity, Bax protein expression. Pretreatment with SYA (40, 60 and 80 nmol/L) concentration-dependently blocked the A/R-induced changes in the cardiomyocytes. Pretreatment of the cardiomyocytes with the antioxidant N-acetylcysteine (NAC, 200 μmol/L) produced protective effects that were comparable to those caused by SYA (80 nmol/L).

Conclusion:

SYA protects cultured rat cardiomyocytes against A/R injury, maybe via inhibiting cellular oxidative stress and apoptosis.     

甘氨酰谷氨酰胺对缺氧/复氧损伤心肌细胞的保护作用及机制研究

目的观察甘氨酰谷氨酰胺(Gly-Gln)对缺氧/复氧(H/R)损伤后心肌细胞凋亡、线粒体膜电位及心肌酶释放的影响,探讨Gly-Gln对心肌H/R损伤的防治作用及机制。方法利用原代培养的SD大鼠乳鼠心肌细胞建立体外心肌H/R模型,实验分为Control组,H/R组,H/R+Gly-Gln(1,4,16 mmol·L-1)组,Gly-Gln(1,4,16 mmol·L-1)组。采用MTT法测定各组心肌细胞存活率;并检测各组培养液中乳酸脱氢酶(LDH)、肌酸激酶(CK)含量;以Annexin V联合PI染色法检测各组心肌细胞凋亡率;以JC-1为荧光分子探针检测各组心肌细胞线粒体膜电位(△Ψm)变化。结果 H/R组心肌细胞活力低于对照组(P<0.01),而培养液中心肌细胞释出的LDH、CK含量则高于对照组(P<0.01);H/R+Gly-Gln组心肌细胞活力高于H/R组(P<0.01),而培养液中LDH、CK含量则低于H/R组(P<0.05),其效应在一定浓度范围内呈剂量依赖关系。H/R组心肌细胞凋亡率升高,线粒体膜电位明显低于对照组(P<0.01);H/R+Gly-Gln组心肌细胞凋亡率较H/R组降低(P<0.05),且心肌细胞线粒体膜电位升高,与H/R组比较差异有显著性(P<0.01)。结论 Gly-Gln可对抗H/R损伤,发挥细胞保护作用,维持心肌细胞活力,减少心肌细胞H/R损伤所致心肌酶(LDH、CK)释放,并可抑制心肌细胞凋亡,具体机制可能与其稳定心肌细胞线粒体膜电位等有关。     

灵芝多糖肽对培养乳大鼠心肌细胞缺氧复氧损伤的保护作用

目的研究灵芝多糖肽(GLPP)对培养乳大鼠心肌细胞缺氧/复氧(H/R)损伤的保护作用。方法用出生1~3 d的SD乳大鼠进行心肌细胞原代培养,取培养3~4 d的心肌细胞分为正常对照组、H/R组和GLPP给药组(12.5,25,50和100 mg·L-1)。MTT法检测细胞存活率;电镜检测细胞形态改变和线粒体损伤;用AnnexinⅤ-FITC/PI双标记细胞,流式细胞仪检测细胞凋亡百分率;以Fluo-3/AM荧光指示剂负载,用激光扫描共聚焦显微镜观察心肌细胞内钙离子荧光强度变化;以活性氧(ROS)敏感的荧光探针2,7-二氢二氯荧光素(DCFH-DA)标记细胞,激光共聚焦显微镜下观察ROS含量变化。结果与正常对照组比较,H/R组细胞存活率降低(P<0.05);GLPP 12.5,25,50和100 mg·L-1组细胞存活率与H/R组比较明显增加(P<0.01)。与正常对照组比较,H/R组可见线粒体损伤,GLPP给药组可以减轻线粒体损伤。流式细胞仪检测结果表明,与正常对照组比较,H/R组细胞凋亡率增加(P<0.01);GLPP组与H/R组比较细胞凋亡率明显减小(P<0.01)。与正常对照组比较,H/R组[Ca2+]i增加,细胞内ROS含量增高(P<0.01);与H/R组比较,GLPP给药组细胞[Ca2+]i减少,细胞内ROS含量降低(P<0.01)。结论GLPP对H/R损伤的乳大鼠心肌细胞具有保护作用,其作用机制可能与减少细胞内自由基含量和减轻细胞内钙超负荷有关。     

巴戟天正丁醇提取物对乳鼠心肌细胞缺氧/复氧损伤后炎性细胞因子的影响

目的：观察巴戟天正丁醇提取物对乳鼠心肌细胞缺氧／复氧损伤后炎性细胞因子的影响。方法：采用培养的乳鼠心肌细胞建立缺氧／复氧损伤模型，实验分正常细胞培养组、缺氧／复氧损伤模型组、巴戟天正丁醇提物小、中、大剂量组。平衡法测定TNF-α、IL-1β、IL-6的含量变化。结果：巴戟天正丁醇提物可明显改善缺氧、复氧损伤；降低TNF-α、IL-1β、IL-6的含量。结论：巴戟天正丁醇提取物对缺氧／复氧损伤的心肌细胞有防护作用；其防护作用可能与降低TNF-α、IL-1β、IL-6的含量有关。     

前列腺素E_1对缺氧复氧乳鼠心肌细胞凋亡的影响

目的　探讨PGE1对缺氧复氧乳鼠心肌细胞凋亡的影响及其作用机制。方法　用原代培养的乳鼠心肌细胞建立缺氧 3 0min复氧 40min损伤模型 ,DNA琼脂糖凝胶电泳和原位末端标记技术 (TUNEL)检测缺氧复氧乳鼠心肌细胞的凋亡 ,原位杂交法检测bcl 2、baxmRNA的含量。结果　模型组乳鼠心肌细胞DNA琼脂糖凝胶电泳呈明显的梯状图谱 ,TUNEL法检测到较多的阳性标记 ,PGE1各给药组随剂量的增加 ,电泳中的DNA梯状条带逐渐减弱 ,PGE1(0 12 7μmol·L- 1)组心肌细胞的凋亡率 (6 80 %± 1 99% )与模型组 (11 40 %± 2 3 2 % )相比差异有统计学意义 (P <0 0 1) ;模型组与正常组相比bcl 2mRNA的含量下降、baxmRNA的含量增加 ,PGE1各给药组与模型组相比能明显的上调bcl 2mRNA的含量、下调baxmRNA的含量。结论　离体培养的乳鼠心肌细胞建立的缺氧复氧损伤模型可诱导心肌细胞的凋亡。PGE1可明显抑制这种凋亡的发生 ,其机制可能与促进bcl 2mRNA的表达、抑制baxmRNA的表达有关     

San-Huang-Xie-Xin-Tang protects cardiomyocytes against hypoxia/reoxygenation injury via inhibition of oxidative stress-induced apoptosis

Oxidative stress has been widely implicated in the pathogenesis of hypoxia/reoxygenation (H/R) injury. San-Huang-Xie-Xin-Tang (SHXT), a widely used traditional Chinese medication, has been shown to possess antioxidant effects. Here, we investigated whether SHXT and its main component baicalin can attenuate oxidative stress induced by H/R injury. H9c2 rat ventricular cells were exposed to SHXT or baicalin followed by hypoxia for 24 h and/or reoxygenation for 8 h. Pretreatment with SHXT and baicalin both significantly prevented cell death and production of reactive oxygen species induced by hypoxia or H/R in H9c2 cardiomyoctes. In addition, SHXT and baicalin also inhibited hypoxia- or H/R-induced apoptosis, with associated decreased Bax protein, increased Bcl-2 protein, and decreased caspase-3 activity. Furthermore, we found that hypoxia and H/R decreased endothelial nitric oxide synthase (eNOS) expression and nitrite production, and these effects were counteracted by SHXT and baicalein. Finally, SHXT inhibited H/R-induced activation of p38 mitogen activated protein kinase (MAPK) and c-Jun N-terminal kinase (JNK) phosphorylation in H9c2 rat ventricular cells. The present study demonstrates for the first time that SHXT can protect cardiomyocytes from H/R injury via inhibition of oxidative stress-induced apoptosis. These cardioprotective effects are possibly mediated through eNOS enhancement and p38 MAPK and JNK-dependent signaling pathways.     

水通道蛋白4在瑞芬太尼后处理对成人心肌低氧复氧损伤保护中的作用

目的通过构建成人心肌低氧复氧(H/R)损伤模型,观测瑞芬太尼后处理对成人心肌H/R损伤的保护效应,并探讨水通道蛋白4(AQP-4)在此效应中的作用。方法成人右心耳肌小梁低氧90 min/复氧120 min,低氧结束前10 min开始分别灌注瑞芬太尼0.01,0.1或1.0 nmol·L~(-1)至复氧开始后10 min停止。实验期间,连续监测肌小梁的收缩张力。实验结束后,Western印迹法检测AQP-4蛋白表达。结果与正常对照组相比,H/R组低氧处理30 min后,肌小梁的收缩张力值明显降低(P<0.05),90 min时降至最低;瑞芬太尼0.1 nmol·L~(-1)组150和180 min时张力值均高于H/R组(P<0.05);瑞芬太尼1.0 nmol·L~(-1)组120,150,180和210 min时,张力值均高于H/R组(P<0.05)。与正常对照组相比,H/R组心肌AQP-4表达水平明显增高(P<0.05);与H/R组比较,瑞芬太尼0.1和1.0 nmol·L~(-1)组心肌AQP-4的表达水平下调(P<0.05)。结论瑞芬太尼可减轻成人心肌H/R损伤,其作用机制可能与AQP-4表达降低有关。     

碘化N-正丁基氟哌啶醇通过非外钙机制抗心肌细胞缺氧复氧损伤

目的研究碘化N-正丁基氟哌啶醇(F2)对大鼠心肌细胞无外钙缺氧/复氧(H/R)损伤的作用及其机制。方法建立无外钙(零钙液)的心肌细胞H/R模型,于缺氧液及复氧液中加入1×10-6mol/L的F2。倒置显微镜下观察细胞形态结构及搏动的变化;采用蛋白印迹法检测心肌细胞磷酸化ERK(p-ERK1/2)、总ERK1/2蛋白表达的变化。结果零钙液H/R可引起培养心肌细胞形态结构呈损伤性改变,包括胞体收缩、伪足减少和搏动无力;零钙液H/R可引起培养心肌细胞p-ERK1/2表达增加,但不影响总ERK表达,即可激活培养心肌细胞ERK1/2;F2可以改善零钙液H/R状态下心肌细胞形态结构的损伤。F2对零钙液H/R心肌细胞p-ERK1/2高表达具有抑制作用,但不影响总ERK的表达。结论 F2可通过非外钙依赖机制拮抗心肌细胞H/R损伤,这可能与其抑制零钙液H/R状态下ERK1/2的激活密切相关。     

茜草双酯对缺氧/复氧心肌细胞的保护作用研究

目的探讨茜草双酯对缺氧复氧的乳鼠心肌细胞是否具有保护作用。方法原代培养乳鼠心肌细胞,建立缺氧复氧模型,分别测各组细胞乳酸脱氢酶(LDH)活性、丙二醛(MDA)含量及细胞的凋亡与坏死。结果与缺氧/复氧模型组比较发现,缺氧/复氧模型预先加茜草组较缺氧/复氧模型组LDH活性和MDA含量降低有统计学意义(P<0.05),细胞凋亡和坏死有所减少。结论茜草双酯对体外培养的缺氧/复氧心肌细胞具有保护和抗凋亡作用。     

钙拮抗剂对缺氧/复氧心肌细胞早期生长反应基因的作用及抗损伤的研究

目的观察钙离子拮抗剂维拉帕米、地尔硫卓和硝苯地平对大鼠缺氧/复氧心肌细胞早期生长反应基因(Egr-1)及抗细胞损伤的作用。方法取生长d 5～6的大鼠心肌细胞分为对照组、缺氧/复氧(H/R)组、DMSO组、维拉帕米(2μmol.L-1)组、地尔硫卓(10μmol.L-1)组和硝苯地平(10μmol.L-1)组,除对照组外其他组制作心肌细胞H/R损伤模型。测定肌酸激酶、乳酸脱氢酶、超氧化物歧化酶及丙二醛的变化,观察心肌细胞损伤情况;RT-PCR方法检测培养心肌细胞中Egr-1mRNA表达水平;Western blot方法检测培养心肌细胞中Egr-1蛋白的表达水平。结果与H/R组相比,维拉帕米组、地尔硫卓组和硝苯地平组Egr-1mRNA及蛋白表达明显减少(P<0.05),心肌细胞损伤程度明显减弱(P<0.01)。结论维拉帕米、地尔硫卓和硝苯地平均可抑制Egr-1的表达,减轻H/R心肌细胞的损伤,这可能是钙离子拮抗剂保护心肌细胞H/R损伤的共同机制之一。     

L型钙通道参与乳化异氟醚对离体心肌细胞缺氧/复氧损伤的保护作用

目的探讨乳化异氟醚(EI)对原代培养心肌细胞缺氧/复氧损伤的保护作用及其与钙通道的关系。方法用原代培养乳鼠离体心肌细胞,建立缺氧/复氧(H/R)损伤模型,随机分为5组(n=8),正常组(N组)、缺氧/复氧组(H/R组)、H/R+脂肪乳组(F组)、H/R+1.68 mmol.L-1EI组(EI组)和H/R+1.68 mmol.L-1EI+10 umol.L-1BayK8644组(EIB组)。各组取细胞培养上清液测定LDH活力与cTnI含量,心肌细胞匀浆后测定SOD活力与MDA含量;用倒置显微镜观察心肌细胞生长特性及形态的变化。钙离子探针Fura-2 AM染色后用流式细胞术检测心肌细胞内钙离子浓度。结果与N组比较,各组的LDH、MDA、cTnI、钙离子浓度均升高(P<0.05),SOD下降(P<0.05);与H/R组比较,F组的SOD下降(P<0.05),LDH、MDA、cTnI、钙离子浓度的差异均无统计学意义(P>0.05);EI组和EIB组的LDH、MDA、cTnI、钙离子浓度均降低(P<0.05),SOD升高(P<0.05)。与F组比较,EI组的LDH、MDA、cTnI、钙离子浓度均下降(P<0.05),SOD升高(P<0.05)。与EI组比较,EIB组的LDH、MDA、cTnI、钙离子浓度均升高,SOD降低(P<0.05)。结论乳化异氟醚对原代培养心肌细胞缺氧/复氧损伤时的保护作用与其抑制L型钙通道,降低细胞内钙超载有关。     

[10]-姜酚对缺氧/复氧诱导的乳鼠心肌细胞损伤的保护作用及机制研究

目的：研究[10]-姜酚对缺氧/复氧诱导原代乳鼠心肌细胞损伤的保护作用及其机制。方法：提取原代乳大鼠心肌细胞,分为空白对照组、模型组、[10]-姜酚不同剂量组（1、3、10 μmol?L-1）。细胞缺氧4 h,复氧2h制备缺氧/复氧损伤模型;CCK-8法测定心肌细胞存活率;测定细胞上清液中生化指标,如乳酸脱氢酶（LDH）、肌酸激酶同工酶（CK-MB）;测定上清液中炎症因子,如肿瘤坏死因子-α（TNF-α）、白介素-6（IL-6）、白介素-1β（IL-1β）含量;Western blot 测定心肌细胞RhoA、ROCK1、p-NF-κB蛋白表达。结果：与模型组相比,[10]-姜酚增加乳鼠心肌细胞存活率,显著降低细胞上清液中LDH、CK-MB、TNF-α、IL-6、IL-1β含量。[10]-姜酚能降低心肌细胞中RhoA、ROCK1、p-NF-κB蛋白表达。结论：[10]-姜酚对乳鼠原代心肌细胞缺氧/复氧损伤具有保护作用,其机制可能与其抑制RhoA/ROCK1/NF-κB信号通路、减轻炎症反应相关。     

碘化N-正丁基氟哌啶醇对培养大鼠心肌细胞缺氧复氧损伤及Egr-1表达的影响

目的观察碘化N-正丁基氟哌啶醇(F2)对培养大鼠心肌细胞缺氧复氧(H/R)所致的损伤及早期生长反应蛋白-1(Egr-1)表达变化的影响。方法制作心肌细胞H/R损伤模型。倒置显微镜和透射电子显微镜下观察心肌细胞一般形态、自发性搏动及超微结构的变化。采用免疫组织化学方法测定心肌细胞Egr-1蛋白阳性表达的细胞数。结果H/R造成心肌细胞形态异常、搏动节律紊乱,导致超微结构损害;H/R诱导心肌细胞Egr-1表达明显增强。缺氧及复氧前给予F2则能改善H/R所致心肌细胞病理损害,抑制心肌细胞Egr-1的过量表达。结论F2对培养心肌细胞H/R损伤具有保护作用,这可能与其抑制Egr-1蛋白过量表达有关。     

冠欣舒胶囊对大鼠心肌细胞缺氧/复氧损伤保护作用的拆方实验研究

目的:研究冠欣舒胶囊对抗心肌细胞缺氧/复氧(A/R)损伤作用,通过正交设计进行拆方实验,以求其最佳配比方案.方法:按原方中丹参、三七、降香分离所得的有效部位及基本配比,设计正交表L16(44);取培养4d的大鼠乳鼠心肌细胞,随机分为18组(n=8):(1)Cont组、(2)A/R组、(3)～(18)受试组进行实验;检测细胞存活率、超氧化物歧化酶(SOD)、Catalase、谷胱甘肽过氧化物酶(GPx)活性、丙二醛(MDA)含量及孵育液乳酸脱氧酶(LDH)活性;用综合平衡法进行分析,得出冠欣舒最佳配比方案,并进行验证实验.结果:不同配比组合的冠欣舒处理组可使细胞存活率与SOD、Catalase、GPx活性均有不同程度的升高,LDH活性与MDA含量均有不同程度的降低(P＜0.01或P＜0.05);三七总皂苷与丹参总酚酸分别在保护细胞与提高细胞抗脂质过氧化作用方面发挥重要作用;冠欣舒的最佳配比组合为:A3B3C2D4.结论:冠欣舒不同的配比具有对抗心肌细胞A/R损伤的作用,其机制可能与抗脂质过氧化作用有关;冠欣舒的最佳配比组合为丹参总酚酸0.027 mg、三七总皂苷0.048 mg、降香油0.002625mg、降香总黄酮0.01326 mg.     

Comparison of cardioprotective effects of labeled and unlabeled oleanoic acids with new BOPIM dye on primary neonatal rat cardiomyocytes following hypoxia/reoxygenation injury

BackgroundIt is well known that fluorescent labeling has recently become a major research tool in molecular and cellular biology for demonstrating therapeutic mechanisms and metabolic pathways. However, few studies have reported the use of fluorescent labeling of natural products.MethodsWe recently explored the boron 2-(2′-pyridyl) imidazole (BOPIM) derivative analogs, which are highly fluorescent, non-aggregated, and nontoxic. In the present study, the natural product oleanolic acid (OA) was functionalized and labeled with BOPIM, thus yielding a highly fluorescent probe, the comparison of cardioprotective effects of labeled and unlabeled OAs with BOPIM on primary neonatal rat cardiomyocytes with hypoxia/reoxygenation (H/R) injury were investigated.ResultsPretreatment with OA and BOPIM-OA significantly prevented the H/R induced cell death in primary neonatal rat cardiomyocytes. However, BOPIM exhibited no improvements on the H/R injury cardiomyocytes, and which were similar to those of the H/R group. The results of comparison of cardioprotective effects between labeled and unlabeled OAs with BOPIM showed that introducing the BOPIM chromophore did not make a difference with H/R injury cardiomyocytes.ConclusionBOPIM chromophore is a suitable probe for investigating the pharmacological mechanisms of natural products.     

PGE_1对培养乳鼠心肌细胞缺氧/复氧损伤的保护作用

目的　研究PGE1对纯化培养心肌细胞缺血再灌注损伤的保护作用及机制。方法　采用纯化培养的心肌细胞建立缺氧 /复氧损伤模型 ,实验分 5组 :正常细胞培养组、缺氧 /复氧损伤模型组、缺氧 /复氧损伤 +PGE1(5、15、4 5 μg·L-1)组。分别用黄嘌呤氧化酶法测定SOD活力 ,硫代巴比妥酸显色法测定MDA含量 ,MTT染色法测定线粒体脱氢酶活性改变并测定LDH含量变化。结果　PGE1可明显提高SOD、LDH活性 ,降低MDA含量并可提高线粒体脱氢酶活性。结论　PGE1具有明显的抗缺氧复氧损伤、保护心肌作用     

紫檀芪通过PI3K-AKT信号途径抑制缺氧/复氧诱导的乳鼠心肌细胞凋亡

目的 探讨紫檀芪对缺氧/复氧诱导的乳鼠心肌细胞凋亡的影响,以及对磷脂酰肌醇3-激酶(PI3K)/蛋白激酶B(AKT)信号通路的影响。方法 乳鼠心肌细胞经过缺氧/复氧(H/R)处理,再模拟心肌缺血再灌注损伤。实验分为正常组,模型组(H/R),紫檀芪组(H/R+0.5,5,50μmol/L紫檀芪)。MTT法检测各组心肌细胞活力;倒置显微镜拍照检测各组心肌细胞形态;Annexin V-FITC/PI流式双染法检测各组心肌细胞凋亡;Western blot分析PI3K/AKT激活状况。结果 与正常组比较,模型组中心肌细胞皱缩,变圆变亮,细胞活力降低,细胞早期凋亡和晚期凋亡率显著提高,PI3K表达量及AKT磷酸化程度降低,差异均具有显著性(P0.05);与模型组比较,5,50μmol/L紫檀芪组中心肌形态恢复,细胞活力上升,PI3K表达量提高,差异均具有统计学意义(P0.05);0.5,5,50μmol/L紫檀芪组心肌细胞凋亡程度下降,AKT磷酸化水平上升,差异均具有统计学意义(P0.05)。结论 紫檀芪可抵抗缺氧/复氧诱导的乳鼠心肌细胞凋亡,PI3K/AKT信号被激活是其作用表达的主要方式。     

葛根素对缺氧-复氧时乳鼠心肌细胞分泌细胞因子的作用

目的　观察葛根素 (Pue)对缺氧 -复氧诱导的大鼠乳鼠心肌细胞分泌的肿瘤坏死因子 α(TNF α)及白细胞介素 6(IL 6 )的作用。方法　采用生物学方法 ,测定对照组、模型组、及 1g·L-1、0 1g·L-1、0 0 1g·L-1Pue给药组在各个时间点时细胞培养上清液中TNF α、IL 6活性的变化。结果　受到缺氧、复氧刺激后TNF α、IL 6活性较对照组增加 (P <0 0 1)。各剂量在缺氧时均表现出降低TNF α活性的作用 ,1g·L-1Pue的作用最强 (P <0 0 1) ,而其它两个剂量在复氧时还能增加TNF α活性。Pue能降低IL 6活性的增加。结论　缺氧、复氧刺激能增加心肌细胞分泌TNF α、IL 6 ;Pue能抑制缺氧时TNF α的分泌 ,但在复氧后 ,除 1g·L-1外 ,其它剂量还表现出升高TNF α的作用 ;Pue可抑制IL 6的过度分泌 ,并呈剂量依赖趋势。