磷脂酶A_2对培养的肺动脉内皮细胞的损伤作用

本研究观察了磷脂酶A_2(PLA_2)对培养的小牛肺动脉内皮细胞的损伤作用和氯喹(CQ)的保护作用,将培养细胞分为四组。正常对照组;PLA_2组(培养液中加入PLA_2 0.15、0.20、0.25μ/ml,分别培养0.5h和4h);PLA_2 CQ组(加入PLA_2前0.5h加入CQ0.5mg/ml);CQ组(加CQ0.5mg/ml);培养至规定时间,测定培养上清液乳酸脱氢酶(LDH)释放率、血清紧张素转化酶(ACE)活性、培养上清液及细胞匀浆丙二醛(MDA)含量;用电镜     

黄芩素通过上调miR-7-5p影响脂多糖诱导的肾小球上皮细胞氧化应激及凋亡

目的:探讨黄芩素(SCU)对脂多糖(LPS)诱导的人肾小球上皮细胞氧化应激和凋亡的影响及其机制。方法:体外培养人肾小球上皮细胞,LPS(1.0 mg/L)处理建立细胞损伤模型,分为正常对照(NC)组、LPS组、NC+SCU组、LPS+SCU组、LPS+miR-NC组、LPS+微小RNA-7-5p(miR-7-5p)组、LPS+SCU+anti-miR-NC组和LPS+SCU+anti-miR-7-5p组。CCK-8法检测细胞活力;流式细胞术检测细胞凋亡;试剂盒测定细胞内丙二醛(MDA)含量和超氧化物歧化酶(SOD)活性,以及细胞培养上清液中乳酸脱氢酶(LDH)活性;RT-qPCR检测miR-7-5p的表达水平。结果:与NC组比较,LPS组细胞活力、miR-7-5p表达和SOD活性显著降低,细胞凋亡率、MDA含量和LDH活性显著升高(P0.05);与LPS组比较,LPS+SCU组细胞活力、miR-7-5p表达和SOD活性显著升高,细胞凋亡率、MDA含量和LDH活性显著降低(P0.05);与LPS+miR-NC组比较,LPS+miR-7-5p组细胞活力和SOD活性显著升高,细胞凋亡率、MDA含量和LDH活性显著降低(P0.05);与LPS+SCU+anti-miR-NC组比较,LPS+SCU+anti-miR-7-5p组细胞活力和SOD活性显著降低,细胞凋亡率、MDA含量和LDH活性显著升高(P0.05)。结论:黄芩素通过上调miR-7-5p表达抑制LPS诱导的肾小球上皮细胞氧化应激损伤和凋亡。     

瘦素(leptin)对ECV-304细胞氧化应激的保护作用

目的:研究外源性瘦素(leptin)在细胞氧化应激中对细胞存活率的影响,探讨leptin在抗氧化应激方面的作用.方法:利用H2O2诱导人脐静脉内皮细胞系ECV-304细胞建立细胞氧化应激模型,设立正常对照、单纯损伤和不同浓度leptin干预组,每组7例,采用噻唑蓝(MTT)比色法检测细胞存活率;比色法测定细胞上清液中丙二醛(MDA)和乳酸脱氢酶(LDH)的含量.结果:与正常对照组相比,加入外源性leptin的三组正常ECV-304细胞存活率无显著变化,但25μg/L leptin组有升高的趋势,100μg/L leptin组有降低的趋势.与单纯损伤组相比,加入外源性leptin的三组损伤ECV-304细胞存活率显著升高(P均＜0.05).与单纯损伤组相比,加入外源性leptin的三组ECV-304细胞上清液中MDA生成量和LDH释放量显著下降(P均＜0.05).结论:leptin对ECV-304细胞的氧化应激具有剂量依赖性的保护作用.     

降钙素基因相关肽对培养的血管内皮细胞缺氧再给氧的影响

目的:观察降钙素基因相关肽(CGRP)对培养的人脐静脉血管内皮细胞缺氧再给氧损伤的影响。方法:用培养的人脐静脉血管内皮细胞建立缺氧再给氧模型,观察血管内皮细胞在缺氧再给氧状态下台盼兰摄取率、细胞内乳酸脱氢酶(LDH)活性,钙、镁含量和丙二醛(MDA)含量的变化以及CGRP对培养的血管内皮细胞的影响。结果:1×10^-8mol/LCGRP可降低缺氧再给氧时血管内皮细胞的台盼兰摄取率、钙含量及MDA含量,降低LDH活性,减少细胞内镁的丢失。结论:CGRP对缺氧再给氧的血管内皮细胞具有直接保护作用,其作用可能与CGRP具有抗脂质过氧化,减轻细胞内钙超载以及减少镁与酶的丢失有关。     

预热应激对缺氧血管内皮细胞的保护作用及其机制

目的:研究预热应激对缺氧血管内皮细胞的保护作用及其发生机制,探索新的防治措施。方法:将血管内皮细胞分为:(1)缺氧组;(2)热应激组;(3)预热应激+缺氧组;(4)对照组。用全自动生化分析仪测定细胞培养液中乳酸脱氢酶(LDH)活性,以台盼兰染色法测定细胞死亡率,用Griess化学法测定细胞培养液中NO₂^-含量,以观察细胞NO生成量。结果:缺氧血管内皮细胞LDH的释放量和细胞死亡率显著大于对照组,39℃预热应激可使其分别降低29.47%和33.67%,41℃预热应激对缺氧细胞无明显保护作用。缺氧使血管内皮细胞NO生成量显著降低。39℃预热应激的缺氧血管内皮细胞NO生成量显著高于缺氧组,41℃预热应激的缺氧血管内皮细胞NO生成量显著低于对照及相应的缺氧组;血管内皮细胞NO生成量与细胞LDH释放量及细胞死亡率呈显著负相关。结论:一定强度的预热应激可以对缺氧血管内皮细胞产生保护作用。细胞NO产生增多在这种保护作用机制中可能具有重要作用。     

原花青素减轻TCP磨损颗粒诱导的骨细胞氧化损伤

目的:研究原花青素(PC)对磷酸三钙(TCP)磨损颗粒诱导的骨细胞氧化损伤的影响,并探讨其可能的作用机制。方法:将TCP磨损颗粒(0.1 g/L)与小鼠长骨MLO-Y4骨细胞共孵育构建骨细胞体外损伤模型,实验分为4组:正常对照(control)组、TCP组、PC(10μmol/L)组和PC(50μmol/L)组。应用Calcein-AM染色和MTT等方法检测骨细胞活力;ELISA检测细胞培养上清液中牙本质基质蛋白1(DMP-1)、骨硬化蛋白(SOST)及白细胞介素1β(IL-1β)水平;流式细胞术定量分析骨细胞凋亡情况;化学比色法检测骨细胞中丙二醛(MDA)含量和超氧化物歧化酶(SOD)活性,以及细胞培养上清液中乳酸脱氢酶(LDH)释放量;Western blot法检测骨细胞中NOD样受体蛋白3(NLRP3)、含CARD的凋亡相关斑点样蛋白(ASC)、cleaved caspase-1和IL-1β蛋白水平的变化。结果:与control组比较,TCP组MLO-Y4细胞的损伤、凋亡率及MDA含量显著增加(P0.05),SOD活性显著降低(P0.05),NLRP3、ASC、cleaved caspase-1和IL-1β蛋白水平显著上调,上清液中IL-1β和LDH的水平明显增加(P0.05);与TCP组比较,PC组MLO-Y4细胞的损伤明显减轻,凋亡率显著降低(P0.05),NLRP3、ASC、cleaved caspase-1和IL-1β的蛋白水平显著下调(P0.05),IL-1β和LDH水平明显降低(P0.05)。结论:PC可明显抑制TCP磨损颗粒诱导的骨细胞氧化损伤,其机制可能与减轻NLRP3炎症小体的活化和细胞焦亡相关。     

Ⅰ型Na+/H+交换器在LPS引起的大鼠肺微血管内皮细胞损伤中的作用

目的探索Ⅰ型Na /H 交换器(NHE1)在脂多糖(LPS)引起的大鼠肺微血管内皮细胞(PMVECs)损伤中的作用。方法培养大鼠PMVECs。MTT比色试验检测细胞活力;比色法测试上清液中乳酸脱氢酶(LDH)活力和丙二醛(MDA)浓度;BECEF-AM荧光探针染色细胞,激光共聚焦显微镜下观察细胞内酸碱度,检测NHE1的活性;PT-PCR技术检测NHE1的mRNA表达。结果LPS不仅使细胞活力降低35%(P<0.05),使上清液中LDH和MDA分别升高3倍和2.5倍(P<0.05),而且使NHE1的活性增强,mRNA表达增多(P<0.05)。但是NHE1的抑制剂———环己阿米洛利(HMA)能显著抑制LPS引起的这些变化(P<0.05)。结论NHE1的活性增强和表达增多是LPS引起大鼠PMVECs损伤的重要机制。     

阿司匹林对炎症条件下人血管内皮细胞一氧化氮的产生及诱导型一氧化氮合酶mRNA表达的影响

目的:探讨炎症时阿司匹林(AS)对内皮细胞一氧化氮(NO)的产生及诱导型一氧化氮合酶(iNOS)基因表达的抑制作用。方法:Griess法测上清液NO^-₂/NO^-₃水平、黄递酶法测NOS活性、常规生化法测乳酸脱氢酶(LDH)、丙二醛(MDA)浓度,染料排除法测细胞活力,RT-PCR技术分析iNOSmRNA水平。结果:白介素(IL)-1β、肿瘤坏死因子(TNF)-α、γ-干扰素(INF)联用脂多糖(LPS)诱导后上清液中NO^-₂/NO^-₃由(4.27±0.75)μmol/L增加到(9.35±1.25)μmol/L,对内皮细胞造成明显的损伤。但3mmol/LAS组NO生成及NOS活性明显降低,LDH释放率及MDA浓度下降,细胞存活率上升,与NO诱导组相比差异显著。并随AS剂量的增加对NO的抑制及对细胞的保护作用更加明显,但AS对生理水平的NO没有抑制作用。同时发现10mmol/L浓度以下AS对iNOSmRNA表达水平没有影响;但10-20mmol/L的AS则可在转录水平上抑制iNOSmRNA的表达。并观察到水杨酸钠及消炎痛不具有抑制NO产生的作用。结论:AS具有明显抑制IL-1β、TNF-α、γ-INF及LPS诱导NO生成的作用,从而保护血管内皮细胞避免炎症时高浓度NO的损伤。     

血管紧张素1-7通过Mas受体减轻血管紧张素Ⅱ所致人肾小球内皮细胞损伤

目的:研究血管紧张素1-7(Ang1-7)对血管紧张素II(Ang II)所致人肾小球内皮细胞(HGECs)损伤的作用及可能机制。方法:体外培养HGECs,随机分为6组:对照组,Ang Ⅱ组,Ang1-7组,Ang II+Ang1-7组,Ang Ⅱ+Ang1-7+Mas受体阻断剂(A779)组及A779组,分别给予相应处理后,采用流式细胞术检测细胞凋亡率和活性氧簇(ROS)含量,荧光显微镜观察ROS的变化;同时检测HGECs培养液中乳酸脱氢酶(LDH)、一氧化氮(NO)、内皮素-1(ET-1)、白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、转化生长因子-β(TGF-β),单核细胞趋化蛋白-1(MCP-1)及细胞间黏附分子-1(ICAM-1)的含量。结果:与对照组比较,Ang II组的细胞凋亡率及ROS平均荧光强度增加(P0.05),上清液中IL-6、TNF-α、TGF-β、MCP-1及ICAM-1的含量增加(P0.05);与Ang Ⅱ组比较,Ang Ⅱ+Ang1-7组的细胞凋亡率及ROS水平降低,上清液中上述炎症因子含量减少(P0.05);与Ang Ⅱ+Ang1-7组比较,A779的加入增加了细胞凋亡率、ROS生成和上清液中炎症因子的含量(P0.05);与Ang Ⅱ组比较,加入Ang1-7可呈剂量依赖性抑制LDH漏出和ET-1分泌、并促进NO的释放(P0.05)。结论:Ang1-7可能通过抑制Mas受体减轻Ang II所致HGECs的损伤。     

1-磷酸鞘氨醇对血小板活化因子所致大鼠肠系膜微血管通透性增高的影响

目的:探讨1-磷酸鞘氨醇(S1P)对血小板活化因子(PAF)引起的大鼠肠系膜微血管通透性增高的影响。方法:本研究拟采用大鼠在体肠系膜微血管灌注的方法,通过测定微静脉的静水传导性(Lp),观察S1P对外源性PAF引起的微血管通透性增高的影响;并利用激光共聚焦显微镜技术,观察S1P对PAF引起的微血管荧光强度变化以及血管内皮细胞钙粘蛋白(VE-cadherin)变化的影响。结果:给予10nmol/LPAF作用后,大鼠肠系膜微血管Lp值明显增高,而经1μmol/L S1P预处理后,再给予PAF并未引起Lp的明显变化;PAF作用微血管后可见微血管内皮细胞间隙打开,微血管荧光强度明显增加,大量红色荧光微球(FMs)分布于内皮细胞间隙之中,S1P预处理后并未见内皮细胞间隙打开及FMs的明显积聚,微血管荧光强度与正常对照值比较无显著差异。结论:PAF可增加微血管的通透性,改变内皮细胞VE-cadherin正常结构,导致粘附连接断裂,细胞间隙形成,血管通透性增加可能与此结构变化有关。S1P能改善PAF引起的血管通透性增高,其作用与加强内皮细胞间粘附连接,抑制细胞间隙打开有关。     

Mechanisms of endothelial cell-dependent leukocyte adhesion stimulated by platelet-activating factor

Platelet-activating factor (PAF) stimulates leukocyte-endothelial cell (EC) adhesion through its effects either on leukocytes or on ECs. ECs may be injured, synthesize, or express new adhesive proteins to increase leukocyte adhesion. Intermediary mediators produced by activated ECs are also likely involved in promoting leukocyte adhesion. Our experiments demonstrated that PAF induced no obvious damage to bovine pulmonary artery ECs evaluated by lactic dehydrogenase release rate, angiotensin-converiting enzyme activity, and cellular malondialdehyde content. Treatment of EC morolayers with 10^–9 M PAF increased polymorphonuclear leukocyte (PMN) adhesion. Increasing PAF concentration did not induce more PMN adherence. PAF elicited both a rapid and prolonged increment of PMN adherence to EC monolayers. The rapid adherence was greatly attenuated by pretreatment of ECs with PAF receptor antagonist SRI 63-441 but was not affected by pretreatment of PMNs with SRI 63-441, suggesting that PAF increases PMN adherence rapidly through its effects on specific receptors on ECs. Increased PMN adherence lasted if PAF treatment of ECs was sustained for 3 or 6 h. Pretreatment of ECs with actinomycin D, a protein synthesis inhibitor, significantly decreased PAF-induced sustained PMN adherence, but the inhibition is incomplete, suggesting that other mechanisms than protein synthesis also participated in the prolonged PMN adherence. We concluded from the results that PAF may induce both rapid and prolonged PMN adhesion to ECs. The effects are receptor mediated. The prolonged PMN adhesion is partly the result of protein synthesis.     

同型半胱氨酸对培养内皮细胞损伤的研究

目的:本研究拟探讨同型半胱氨酸对培养人脐静脉内皮细胞的损伤效应,以揭示同型半胱氨酸致动脉粥样硬化的可能机制。方法:将人脐静脉内皮细胞暴露于不同浓度的同型半胱氨酸24h后,观察细胞形态并测定细胞的乳酸脱氢酶释放率、总蛋白含量、凋亡及脂质过氧化的程度。结果:(1)同型半胱氨酸不仅可诱导细胞凋亡而且在较高浓度时可致细胞坏死;(2)同型半胱氨酸有较强的促脂质过氧化的效应,并呈量效关系;(3)同型半胱氨酸的上述效应因加入LDL而增强,示同型半胱氨酸与LDL有协同作用。结论:同型半胱氨酸可能是通过氧化应激机制导致内皮细胞出现坏死,凋亡等损伤的改变。     

Thrombin-treated endothelium primes neutrophil functions: inhibition by platelet-activating factor receptor antagonists

We have shown previously that fluid phase platelet-activating factor (PAF) can enhance or "prime" polymorphonuclear (PMN) responses to subsequent stimulation with agonists such as formyl-methionine-leucine-phenylalanine (FMLP). Since thrombin induces PAF production in endothelial cells, we tested whether this thrombin-provoked endothelial PAF primes responses of marginated PMNs. Monolayers of human umbilical vein endothelial cells were exposed to either thrombin (0.5-5.0 units/ml) or buffer for up to 5 min and then PMNs were layered on top of the endothelial cells. After a further 5 min incubation, the PMNs were stimulated with a suboptimal concentration of FMLP (10(-7) M), and their superoxide production, elastase release, adhesion to endothelium, and capacity to cause endothelial cell lysis and detachment were assessed. Thrombin pretreatment significantly enhanced each of these FMLP-stimulated neutrophil responses. The extent of this enhancement correlated with both the dose and duration of thrombin treatment of endothelial cells and also the duration of PMN incubation with thrombin-exposed endothelium. Evidence that the augmentation was due to endothelial-derived PAF was obtained as follows: (1) thrombin induced [3H]acetate incorporation into endothelial PAF (assayed in lipid extracts); (2) antithrombin III conjointly inhibited this [3H]acetate uptake and prevented the priming effect of thrombin-treated endothelium on PMN responses; and (3) the PAF receptor antagonist BN52021, when preincubated with PMNs, also effectively blocked the enhancement of PMN responses. We conclude that thrombin stimulation of endothelial cells initiates a sequence of events culminating in the production of PAF--a membrane phospholipid capable of priming marginated PMNs. We suggest that this coagulation-fostered endothelial/PMN interaction may underlie a paracrine response that may potentiate PMN-mediated endothelial injury during sepsis and other thrombin-generating disorders.     

铜,锌对培养心肌细胞缺氧／再给氧损伤的影响

本文观察了不同浓度的铜、锌对培养乳鼠心肌细胞缺氧/再给氧损伤后超氧歧化酶(superoxid dismutase,SOD)、谷胱甘肽过氧化物酶(glutathione peroxidase,GSH-px)活性和脂质过氧化(lipid peroxidation,LPO)代谢产物丙二醛(malondialodehyde,MDA)含量改变,以及乳酸脱氢酶(lactate dehydrogenase,LDH)释放的影响。结果表明:缺氧/再给氧后,心肌细胞SOD活性降低,GSH-px活性和MDA含量增高,LDH释放增加。铜、锌均能不同程度地提高SOD活性,但铜的作用强于锌。锌、铜均可降低LDH的释放,但锌的作用强于铜,锌、铜浓度过高反而增加LDH的释放。此外,铜使GSH-px活性明显升高,并显著降低MDA含量。     

敲减TLR4表达减少LPS诱导的胰腺腺泡AR42J细胞分泌炎症因子

目的:研究Toll样受体4(TLR4)对脂多糖(LPS)诱导的胰腺腺泡AR42J细胞分泌炎症因子的影响。方法:用LPS处理大鼠胰腺腺泡AR42J细胞,real-time PCR和Western blot测定细胞中TLR4表达的变化。将携带TLR4 siRNA的慢病毒感染AR42J细胞,给予LPS处理,real-time PCR和Western blot检测干扰效率,MTT法检测细胞活力,二硝基苯肼法测定乳酸脱氢酶(LDH)的漏出率,ELISA法检测细胞分泌白细胞介素1β(IL-1β)和肿瘤坏死因子α(TNF-α)的水平,硫代巴比妥酸法测定上清中丙二醛(MDA)的含量,用黄嘌呤氧化法测定上清中超氧化物歧化酶(SOD)活力,比色法检测谷胱甘肽过氧化物酶(GSH-Px)和过氧化氢酶(CAT)的活性。结果:LPS处理后的AR42J细胞中TLR4的mRNA和蛋白水平明显升高(P0.01)。携带TLR4 siRNA的慢病毒可以明显下调LPS刺激下AR42J细胞中TLR4的mRNA和蛋白水平(P0.01)。LPS处理后的AR42J细胞活力降低,LDH漏出率升高,细胞分泌的IL-1β和TNF-α增多,培养上清中MDA含量升高,SOD、GSH-Px和CAT活性降低(P0.01)。敲减TLR4表达可以提高LPS刺激下AR42J细胞的活力,降低细胞的LDH漏出率及分泌IL-1β和TNF-α的水平,减少细胞培养液中MDA的含量,提高SOD、GSH-Px和CAT的水平(P0.01)。结论:LPS诱导胰腺腺泡AR42J细胞TLR4表达,敲减其表达可以减少LPS诱导的AR42J细胞分泌IL-1β、TNF-α等炎症因子,减轻氧化损伤。     

Increased expression of heat shock protein 72 protects renal proximal tubular cells from gentamicin-induced injury

The nephrotoxicity of gentamicin (GM) has been widely recognized. Heat shock protein 72 (HSP72) has been reported to be a cytoprotectant. However, its cytoprotective effect against GM induced kidney injury has not yet been studied. In this study, we investigated the cytoprotective effect of HSP72 on GM-induced nephrotoxicity in vitro. Human Kidney tubular cell line, HK-2 cells were divided into four groups: control group, GM group (cells incubated with GM only), heat shock (HS) group (cells incubated at 43 degrees C for 30 min), and GM plus HS group, respectively. Lactate dehydrogenase (LDH) release increased time-dependently from 24 hr to 96 hr compared to the data of cells treated with GM only. Results of NAG activities, superoxide dismutase (SOD) activities and malondialdehyde (MDA) content were similar to that of the LDH release. The amount of HSP72 positive cells increased significantly at 72 hr after cells were treated with GM only. Both HSP72 protein and gene expression increased significantly at 72 hr when cells were treated with GM. On the other hand, HS induced HSP72 expression markedly. Pretreatment of HS inhibited HK-2 cells from GM-induced injury. It could reduce LDH release and NAG activity. HS also increased SOD activity, and decreased MDA content when cells were damaged by GM. These findings suggested that HS may protect kidney cells from GM-induced injury. Pre-induction of HSP72 may provide therapeutic strategies for nephrotoxicity induced by GM.     

游离脂肪酸所致血管内皮细胞损伤及川芎嗪干预作用的实验观察

目的　 1)观察不同浓度游离脂肪酸 (freefattyacids,FFA)对培养的内皮细胞的直接损伤作用 :2 )观察中药川芎嗪这种损伤作用的影响。方法　采用人脐静脉内皮细胞的体外培养方法 ,观察不同浓度FFA (palmitate +oleate)、川芎嗪 (tetramethylpyrazine ,TMP)分别及共同作用后细胞形态学变化及上清液中乳酸脱氢酶 (dehydrogenase,LDH)、丙二醛 (MDA)和前列腺环素 (prostacyclin ,PGl2 )含量变化。结果　内皮细胞在高浓度FFA (palmitate 0 .2 5mmol/L +oleate 0 5mmol/L)作用后细胞形态学发生变化 ,上清液中LDH、MDH含量明显增加 (P <0 0 5 ) ,同时PGl2含量显著降低 (P <0 0 5 ) ,加入川芎嗪 (4、 2 0、 10 0 μg/ml)后能使上述结果逆转 ,且呈剂量依赖性 (P <0 0 5 )。 结论　可见 1)FFA可直接损伤内皮细胞 ,本研究为FFA在 2型糖尿病和胰岛素抵抗综合征的血管并发症中的病理生理效应提供了一个有效的体外模型 ;2 )川芎嗪对FFA的这种损伤具有保护作用     

Nutlin-3 促进肝癌细胞SMMC-7721 发生焦亡的作用

目的:探讨MDM2 拮抗剂Nutlin-3 促进肝癌细胞SMMC-7721 发生焦亡的作用及相关机制。方法:Western blot 检测细胞中活化caspase-1(p20)及IL-1β的表达,LDH 法检测SMMC-7721 细胞焦亡情况,ELISA 检测细胞上清中IL-1β释放情况。结果:Nutlin-3 提高SMMC-7721 细胞活化caspase-1(p20) 及IL-1β的蛋白表达水平。Nutlin-3 处理显著提高了SMMC-7721 细胞培养上清中的LDH 及IL-1β的表达水平(P<0.05)。结论:Nutlin-3 激活了caspase-1,诱导肝癌细胞SMMC- 7721 发生焦亡,并促进IL-1β释放。     

PTEN对缺氧复氧心肌H9c2细胞凋亡、氧化损伤及免疫炎症因子水平的影响

目的:研究第10号染色体缺失的磷酸酶及张力蛋白同源物(PTEN)对缺氧复氧条件下心肌H9c2细胞凋亡、氧化损伤及免疫炎症因子水平的影响。方法:用H9c2细胞构建缺氧复氧模型。细胞转染PTEN小干扰RNA(siRNA)和阴性对照siRNA,缺氧复氧处理后,RT-PCR和Western blot分别测定细胞中PTEN的mRNA和蛋白水平。MTT法测定细胞活力,流式细胞术测定细胞凋亡,用黄嘌呤氧化法测定细胞中超氧化物歧化酶(SOD)活性,用硫代巴比妥酸法测定丙二醛(MDA)含量,用二硝基苯肼法测定培养液上清中乳酸脱氢酶(LDH)活性,ELISA测定培养液上清中肿瘤坏死因子α(TNF-α)、白细胞介素1β(IL-1β)和白细胞介素6(IL-6)水平,Western blot法测定细胞中cleaved caspase-3、Bax和Fas L的蛋白水平。结果:缺氧复氧处理后H9c2细胞中PTEN的mRNA和蛋白水平均明显升高(P 0. 05)。转染PTEN siRNA后的细胞中PTEN的mRNA和蛋白水平明显下降(P 0. 05)。缺氧复氧处理后H9c2细胞活力下降,凋亡率升高,细胞中cleaved caspase-3、Bax和Fas L的蛋白水平升高,MDA水平也升高,SOD活性下降,培养液上清中LDH、TNF-α、IL-1β和IL-6的水平升高(P 0. 05),而下调PTEN可以部分拮抗缺氧复氧对H9c2细胞活力、凋亡率、MDA水平、SOD水平及培养液上清中LDH、TNF-α、IL-1β和IL-6水平的影响。结论:下调PTEN可以减轻缺氧复氧诱导的心肌H9c2细胞氧化损伤,减少H9c2细胞凋亡,降低TNF-α、IL-1β和IL-6的水平。