OPA1在缺氧心肌细胞凋亡中的保护作用

目的：探讨线粒体融合蛋白OPA1在缺氧环境下心肌细胞凋亡中的保护作用。方法：利用小干扰RNA(siRNA)在体外下调OPA1表达后,用流式检测对缺氧环境下心肌细胞凋亡的影响;用Western blot检测对缺氧环境下心肌细胞线粒体细胞色素c释放及Caspase-3与Caspase-9活性的影响;用流式分析对缺氧环境下心肌细胞活性氧ROS产生的影响。结果：下调OPA1可明显加重缺氧诱导的心肌细胞凋亡;下调OPA1可诱导线粒体细胞色素c释放并同时激活Caspase-3与Caspase-9的活性;下调OPA1可诱导心肌细胞中ROS产生。     

曲美他嗪对缺氧诱导原代大鼠心肌细胞凋亡的影响

目的研究曲美他嗪对缺氧诱导的心肌细胞凋亡及线粒体能量代谢改变的影响。方法采用胰酶和胶原酶联合消化的方法,提取大鼠原代心肌细胞,三气培养箱模拟缺氧损伤。MTT和Hoechst染色检测细胞活性和凋亡,TMRE染色检测线粒体膜电位,Oxygraph-2k细胞呼吸测量仪检测态3、态4呼吸和呼吸控制率,Western blot检测Caspase-3、细胞色素C以及线粒体呼吸链复合酶体Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ蛋白表达水平的变化。结果缺氧能够诱导心肌细胞凋亡、引起线粒体膜电位下降和促进细胞色素C的释放。此外,缺氧能够显著下调态3呼吸和上调态4呼吸,引起呼吸控制率的下降,同时缺氧能够不同程度地下调线粒体呼吸链复合酶体Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ的蛋白表达水平。曲美他嗪能够显著降低缺氧诱导的心肌细胞凋亡、稳定线粒体膜电位和减少细胞色素C释放。此外,曲美他嗪还能减轻缺氧对线粒体呼吸链复合酶体的损伤,维持线粒体有氧呼吸。结论曲美他嗪具有抵抗缺氧致心肌细胞凋亡的作用,可能与其稳定线粒体膜和呼吸链复合酶体有关,继而减少细胞色素C的释放和维持线粒体有氧呼吸。     

上调Yes相关蛋白对缺氧复氧心肌细胞损伤保护作用的实验研究

目的研究Yes相关蛋白(YAP)在缺氧复氧(H/R)心肌细胞损伤中的作用。方法用过表达YAP重组慢病毒感染心肌细胞,给予H/R处理,用real-time PCR和Western blot检测细胞中YAP表达情况。CCK8法测定增殖变化,二硝基苯肼显色法检测乳酸脱氢酶(LDH)漏出率,流式细胞术检测凋亡变化,Western blot检测活化型Caspase-3和Caspase-9蛋白水平,DCFH-DA法检测活性氧(ROS)水平,黄嘌呤氧化法检测超氧化物歧化酶(SOD)活性,JC-1法检测线粒体膜电位,Western blot法检测胞浆和线粒体中细胞色素C(Cytochrome C)蛋白水平。结果过表达YAP重组慢病毒感染可以提高H/R条件下心肌细胞中YAP表达水平。H/R处理后的心肌细胞增殖活性降低,LDH漏出率升高,细胞凋亡率升高,细胞中活化型Caspase-3和Caspase-9蛋白水平升高,ROS水平也升高,SOD活性降低,线粒体膜电位下降,胞浆中Cytochrome C蛋白水平升高,线粒体中Cytochrome C蛋白水平降低。上调YAP可以提高H/R条件下心肌细胞增殖活性,降低LDH漏出率,减少细胞凋亡,降低细胞中活化型Caspase-3和Caspase-9蛋白水平表达,提高SOD活性,减少细胞中ROS水平,提高线粒体膜电位,降低胞浆中Cytochrome C蛋白水平,提高线粒体中Cytochrome C蛋白水平。结论上调YAP减轻缺氧复氧心肌细胞损伤,减少细胞凋亡,作用机制可能与提高抗氧化酶活性,减少细胞内ROS水平,抑制线粒体凋亡途径有关。     

血脂康对氧化型低密度脂蛋白致人脐静脉内皮细胞凋亡的拮抗作用

目的研究血脂康对氧化型低密度脂蛋白(ox-LDL)诱导的人脐静脉内皮细胞(HUVEC)凋亡的影响及其可能机制。方法体外培养HUVEC,实验分为空白对照组、ox-LDL组、ox-LDL+不同浓度(25 mg/L、50 mg/L和100 mg/L)血脂康组。采用细胞增殖及毒性检测试剂盒检测细胞存活率,Annexin V-FITC/PI双染细胞检测细胞凋亡,活性氧检测试剂盒检测细胞内活性氧(ROS),蛋白免疫印迹分析细胞色素C(CytC)、Caspase-3和PARP-1蛋白的表达情况。结果血脂康(25 mg/L、50 mg/L和100 mg/L)可拮抗ox-LDL诱导的HUVEC凋亡、ROS水平增加,100 mg/L血脂康可下调细胞CytC、Caspase-3和PARP-1蛋白的表达。结论血脂康可通过减少ROS形成而抑制CytC释放、减少Caspase-3和PARP-1活化抑制线粒体凋亡途径启动,拮抗ox-LDL诱导的血管内皮细胞凋亡。     

缺氧对大鼠心肌细胞损伤的影响及机制

目的探讨缺氧对大鼠心肌细胞系H9C2的损伤及机制。方法在1%O_2+5%CO_2+94%N_2条件下培养大鼠心肌细胞株H9C2 3、6、12、24、48 h,并以正常大鼠心肌细胞株作对照,使用台盼蓝进行细胞计数;CCK-8法检测细胞存活率;实时监测心肌细胞生长状态;透射电镜观察细胞内部结构;活性氧检测试剂盒检测胞内活性氧(ROS);Western印迹法检测线粒体色素C蛋白表达水平;流式细胞术检测细胞凋亡率;乳酸脱氢酶(LDH)试剂盒检测细胞坏死程度。结果缺氧状态下,随着缺氧时间的不断增加,大鼠心肌细胞株H9C2的细胞生长、存活率均明显降低、细胞形态明显改变,细胞器结构明显损伤,ROS水平升高,线粒体细胞色素释放增加,细胞凋亡率明显增加,LDH的释放率明显增高。结论缺氧会造成大鼠心肌细胞的生长速度减慢、形态改变及心肌线粒体损伤,最终导致细胞凋亡和细胞坏死。     

血管紧张素(1-7)抑制异丙肾上腺素诱导的H9c2心肌细胞凋亡

目的观察血管紧张素(1-7)[Ang(1-7)]对心肌细胞凋亡的影响,探讨其可能的作用机制。方法应用异丙肾上腺素(ISO)处理H9c2心肌细胞12 h建立心肌细胞凋亡模型,Ang(1-7)或PI3K抑制剂LY294002与H9c2心肌细胞共处理12 h观察对ISO诱导的心肌细胞凋亡的影响。显微镜下观察H9c2心肌细胞生长情况,采用MTS法检测各组细胞的相对细胞活性,TUNEL法检测各组细胞凋亡率。JC-1荧光探针检测线粒体膜电位,Western blot检测cleaved Caspase-3、p-Akt及Akt蛋白的表达量。结果 ISO呈浓度依赖性抑制H9c2心肌细胞的相对细胞活性,Ang(1-7)呈浓度依赖性逆转ISO诱导的H9c2心肌细胞相对活性的降低;与对照组比较,ISO组细胞凋亡率及cleaved Caspase-3蛋白表达量显著增加,线粒体膜电位和p-Akt蛋白表达量显著降低;Ang(1-7)可抑制ISO诱导的H9c2心肌细胞凋亡率的增加,减少cleaved Caspase-3蛋白的表达,增加线粒体膜电位和p-Akt蛋白表达量。LY294002预处理后Ang(1-7)对ISO诱导的H9c2心肌细胞的保护作用明显减弱,表现为心肌细胞凋亡率及cleaved Caspase-3蛋白的表达量明显增加,p-Akt蛋白表达量减少。结论 ISO能诱导H9c2心肌细胞线粒体途径的细胞凋亡,而Ang(1-7)能抑制ISO诱导的线粒体途径的细胞凋亡。PI3K/Akt信号通路可能在Ang(1-7)抑制ISO诱导的H9c2心肌细胞凋亡中起到关键作用。     

沙库巴曲缬沙坦调节线粒体动力系统改善缺氧心肌细胞凋亡的实验研究

目的 探讨沙库巴曲缬沙坦（Sacubitril Valsartan,S/V）通过调节线粒体动力系统对缺氧H9c2心肌细胞凋亡保护作用。方法 实验分为3组: 对照组、造模组、造模 S/V组。流式细胞术检测细胞凋亡及活性氧（Reactive oxygen species,ROS）,JC-1检测线粒体膜电位,蛋白质免疫印迹法（Western blot,WB）检测线粒体融合蛋白1（Mfn1）、线粒体融合蛋白2（Mfn2）、动力相关蛋白 1 (Drp1)、线粒体分裂蛋白1（Fis1）、细胞色素C（CytC）、B细胞淋巴瘤2 (Bcl-2)、Bcl-2关联X蛋白（Bax）及含半胱氨酸天冬氨酸蛋白水解酶3 (Caspase-3)表达情况。采用 GraphPad Prism 8统计软件进行数据分析,多组间比较采用单因素方差分析。结果 H9c2心肌细胞建立糖氧剥夺模型,经S/V处理光镜下心肌细胞形态学明显改善;流式细胞技术分析S/V明显降低细胞内ROS水平,抑制心肌细胞凋亡（P＜0.05）;荧光显微镜分析提示S/V明显改善线粒体膜电位水平（P＜0.05）;WB显示S/V可明显提升Mfn2、Mfn1、Bcl2蛋白表达水平,降低Drp1、Fis1、CytC、Bax及Caspase-3蛋白表达水平（P＜0.05）。结论 S/V可能通过促进线粒体融合、抑制线粒体分裂调节线粒体稳态,减少ROS生成,减轻心肌细胞凋亡。     

过氧化氢通过线粒体通路和死亡受体通路诱导心肌细胞凋亡

为探讨氧化应激诱导心肌细胞凋亡的分子机制，采用0．5mmol／L过氧化氢作用于原代培养的新生大鼠心肌细胞。末端标记发现过氧化氢明显诱导心肌细胞凋亡；Caspase活性定量检测及Western-blot发现Caspase-3、Caspase-8和Caspase-9同时被激活；而Western-blot及间接免疫荧光发现细胞色素C从线粒体释放入胞浆。以上结果提示，氧化应激通过同时激活线粒体通路与死亡受体通路导致心肌细胞凋亡，从而为临床防治与细胞凋亡相关的心血管疾病提供了新的信息。     

BRD7对过氧化氢处理的心肌细胞线粒体膜电位和胞浆中Cyt C蛋白水平影响研究

目的研究溴区包含蛋白7(BRD7)对过氧化氢处理的心肌细胞线粒体膜电位和胞浆中细胞色素C(Cyt C)蛋白表达影响。方法以real-time PCR和Western blot方法检测过氧化氢处理后的心肌细胞中BRD7转录和表达水平。用BRD7 shRNA慢病毒和shRNA control慢病毒感染心肌细胞,以real-time PCR和Western blot方法检测过氧化氢条件下干扰效果。MTT测定细胞增殖活性,流式细胞术测定细胞凋亡情况,JC-1法检测线粒体膜电位,Western blot方法检测胞浆中Cyt C蛋白水平。结果过氧化氢处理后的心肌细胞中BRD7转录和表达水平升高。BRD7 shRNA慢病毒能够下调过氧化氢条件下心肌细胞中BRD7的表达水平。过氧化氢降低心肌细胞增殖活性,诱导心肌细胞凋亡,降低线粒体膜电位,增加胞浆中Cyt C蛋白水平。下调心肌细胞中BRD7表达可以拮抗过氧化氢对心肌细胞增殖活性、凋亡、线粒体膜电位及胞浆中Cyt C蛋白水平影响。结论下调BRD7提高过氧化氢条件下心肌细胞线粒体膜电位,降低胞浆中Cyt C蛋白水平,抑制细胞凋亡。     

从凋亡信号通路探讨热休克蛋白保护过氧化氢所致心肌细胞凋亡的机制

为探讨热休克蛋白保护过氧化氢所致心肌细胞凋亡的分子机制，采用热休克对原代培养的新生大鼠心肌细胞进行预处理，以诱导热休克蛋白的表达，观察热休克蛋白对过氧化氢所致心肌细胞凋亡的保护作用。结果发现，热休克预处理导致心肌细胞热休克蛋白70及αB-晶状体蛋白表达明显增加，同时显著抑制过氧化氢所致细胞色素C从线粒体释放，抑制Caspase-8、Caspase-9和Caspase-3活化及随后的心肌细胞凋亡。以上结果提示，热休克蛋白通过抑制线粒体信号通路与死亡受体通路的活化保护过氧化氢导致的心肌细胞凋亡，为临床防治心血管疾病提供了新的信息。     

Morphological and molecular characterization of adult cardiomyocyte apoptosis during hypoxia and reoxygenation

Apoptosis has been implicated in ischemic heart disease, but its mechanism in cardiomyocytes has not been elucidated. In this study, we investigate the effects of hypoxia and reoxygenation in adult cardiomyocytes and the molecular mechanism involved in cardiomyocyte apoptosis. Morphologically, reoxygenation induced rounding up of the cells, appearance of membrane blebs that were filled with marginated mitochondria, and ultrastructural findings characteristic of apoptosis. Reoxygenation (18 hours of reoxygenation after 6 hours of hypoxia) and prolonged hypoxia (24 hours of hypoxia) resulted in a 59% and 51% decrease in cellular viability, respectively. During reoxygenation, cell death occurred predominantly via apoptosis associated with appearance of cytosolic cytochrome c and activation of caspase-3 and -9. However, nonapoptotic cell death predominated during prolonged hypoxia. Both caspase inhibition and Bcl-2 overexpression during reoxygenation significantly improved cellular viability through inhibition of apoptosis but had minimal effect on hypoxia-induced cell death. Bcl-2 overexpression blocked reoxygenation-induced cytochrome c release and activation of caspase -3 and -9, but caspase inhibition alone did not block cytochrome c release. These results suggest that apoptosis predominates in cardiomyocytes after reoxygenation through a mitochondrion-dependent apoptotic pathway, and Bcl-2 prevents reoxygenation-induced apoptosis by inhibiting cytochrome c release from the mitochondria and prevents activation of caspase-3 and -9.     

粒细胞集落刺激因子对乳鼠缺氧心肌细胞的保护作用及机制探讨

目的研究粒细胞集落刺激因子(G-CSF)对缺氧心肌细胞的影响,探讨G-CSF发挥心肌细胞保护作用的分子机制。方法将心肌细胞分为3组,对照组、缺氧组和G-CSF组。流式细胞仪检测各组心肌细胞的存活率、凋亡率和坏死率。Northern blot法检测3组心肌细胞中Bcl-2、Bax、caspase-3 mRNA的表达,western blot法检测3组心肌细胞中细胞色素C(Cyt C)、信号转导与转录激活因子3(STAT-3)、caspase-3蛋白的表达。结果 6μg/LG-CSF开始发挥对缺氧心肌细胞的保护作用,150 μg/L保护作用最强,30μg/L和750μg/L保护作用相似。对照组、缺氧组和G-CSF组心肌细胞的存活率、凋亡率和坏死率差异有统计学意义。与缺氧组比较,G-CSF组Bcl-2mRNA表达增加,Bax、caspase-3 mRNA、Cyt C和caspase-3蛋白表达减少(P<0.01)。结论缺氧心肌细胞中,G-CSF可能通过线粒体途径发挥抗凋亡的作用。     

Salubrinal protects against tunicamycin and hypoxia induced cardiomyocyte apoptosis via the PERK-eIF2α signaling pathway

Objectives This study examined the protective effect of salubrinal and the mechanism underlying this protection on tunicamycin (TM)- and hypoxia-induced apoptosis in rat cardiomyocytes. Methods Neonatal rat cardiomyocytes were cultured from the ventricles of 1-day-old Wistar rats. Cells were exposed to different concentrations of salubrinal (10, 20, and 40 μmol/L) for 30 minutes followed by TM treatment or hypoxia for 36 hours. Apoptosis was measured by a multiparameter HCS (high content screening) apoptosis assay, TUNEL assay and flow cytometry. The phosphorylation of eukaryotic translation initiation factor 2 subunit alpha (p-eIF2α) and the expression of cleaved caspase-12 were determined by western blotting. C/EBP homologous protein (CHOP) was detected by immunocytochemistry. Results HCS, TUNEL assays and flow cytometry showed that salubrinal protected against apoptosis induced by TM or hypoxia. Western blotting showed that salubrinal protected cardiomyocytes against apoptosis by inducing eIF2α phosphorylation and down-regulating the expression of the endoplasmic reticulum stress-mediated apoptotic proteins, CHOP and cleaved caspase-12. Conclusions Our study suggests that salubrinal protects rat cardiomyocytes against TM- or hypoxia-associated apoptosis via a mechanism involving the inhibition of ER stress-mediated apoptosis.     

五味子乙素通过半胱天冬酶凋亡途径对抗高糖诱导的心肌细胞氧化应激损伤

目的 研究五味子乙素(Sch.B)是否可通过降低活性氧(ROS)的生成保护糖尿病状态下心肌细胞;是否通过抑制细胞凋亡减轻高糖诱导的心肌细胞损伤.方法 链脲佐菌素诱导Wistar大鼠制备1型糖尿病模型.口服药物Sch.B 4周后进行取材和检测.心肌细胞分为低糖组和高糖组,高糖+Sch.B组和高糖+氧自由基清除剂组.DHE...     

ARC inhibits cytochrome c release from mitochondria and protects against hypoxia-induced apoptosis in heart-derived H9c2 cells

Ischemia induces apoptosis as well as necrosis of cardiac myocytes. We recently reported the cloning of a cDNA that encodes an apoptotic inhibitor, ARC, that is expressed predominantly in cardiac and skeletal muscle. In the present study, we examined the ability of ARC to protect rat embryonic heart-derived H9c2 cells from apoptosis induced by hypoxia, a component of ischemia. We found that H9c2 cells express ARC and that exposure to hypoxia substantially reduces ARC expression while inducing apoptosis. Transfected H9c2 cells in which cytosolic ARC protein levels remain elevated during hypoxia were significantly more resistant to hypoxia-induced apoptosis than parental H9c2 cells or H9c2 cells transfected with a control vector. Loss of endogenous ARC in the cytosol of H9c2 cells was associated with translocation of ARC from the cytosol to intracellular membranes, release of cytochrome c from the mitochondria, activation of caspase-3, poly(ADP-ribose)polymerase (PARP) cleavage, and DNA fragmentation. All of these events were inhibited in H9c2 cells overexpressing ARC when compared with control cells. In contrast, caspase inhibitors prevented PARP cleavage but not cytochrome c release, suggesting that exogenously expressed ARC acts upstream of caspase activation in this model of apoptosis. These results demonstrate that ARC can protect heart myogenic H9c2 cells from hypoxia-induced apoptosis, and that ARC prevents cytochrome c release by acting upstream of caspase activation, perhaps at the mitochondrial level.     

Translational regulation of XIAP expression and cell survival during hypoxia in human cholangiocarcinoma

BACKGROUND & AIMS: Tumor progression is promoted by the ability of tumor cells to resist adverse environmental conditions such as hypoxia. We have shown that translational dysregulation contributes to transformed cell growth in malignant cholangiocytes. Translational regulation of gene expression can contribute to an immediate and rapid response to environmental changes such as hypoxia. Thus, our aims were to assess translational mechanisms involved in cell survival during hypoxia and to identify specific translationally regulated proteins involved in the cellular response to hypoxia. METHODS: Cell viability and apoptosis in response to hypoxia were assessed in human cholangiocarcinoma cells. Translational processes were deregulated by cycloheximide or rapamycin or by targeted deletion of eukaryotic initiation factor (eIF)-4E, a rate-limiting translational initiation factor using small interfering RNA (siRNA). A protein antibody microarray was used to screen for eIF-4E-dependent proteins expressed during hypoxia. Expression of the X-linked inhibitor of apoptosis (XIAP) was decreased using siRNA. RESULTS: Malignant cholangiocytes are resistant to hypoxia-induced apoptosis. Furthermore, cell survival during hypoxia required protein translation. eIF-4E was over expressed in malignant cholangiocytes. Reduction in eIF-4E expression by siRNA decreased tumor cell resistance to hypoxia, increased caspase-3 activation and apoptosis, and decreased cell survival compared with controls. XIAP was identified as a translationally regulated protein expressed during hypoxia. Modulation of XIAP expression by siRNA decreases cell death during hypoxia in vitro and in vivo. CONCLUSIONS: Human cholangiocarcinoma cells are highly resistant to hypoxia. Translational regulation of survival proteins such as XIAP is a mechanism mediating cholangiocarcinoma survival during hypoxia.     

脂联素通过APPL1减轻缺氧/复氧损伤诱导的心肌细胞凋亡

目的:探讨APPL1在脂联素（adiponectin,ANP）拮抗SD乳鼠心肌细胞（neonatal cardiomyocytes）缺氧/复氧（H/R）损伤中的作用。方法: 分离SD乳鼠心肌细胞并培养。通过对培养的心肌细胞H/R损伤模拟缺血/再灌注（simulated ischemia reperfusion,SI/R）后,随机分为对照组、H/R组、H/R+APN组及H/R+APN+APPL1 RNAi组。采用四甲基偶氮唑蓝(MTT)比色法检测细胞的生存率,原位缺口末端标记(TUNEL)法检测细胞的凋亡,Western blot检测APPL1蛋白的表达。结果: 与对照组相比,H/R组吸光度值明显降低（P<0.01）,凋亡指数(AI)显著上升（P<0.01）。与对照组和H/R组相比,H/R+APN组中APPL1的表达明显上升（P<0.05）。以RNAi抑制APPL1表达后,与H/R+APN组相比,H/R+APN+APPL1 RNAi组凋亡指数率(%)明显上升 ［(28.32±4.13)% vs.(9.78±2.16)%,P<0.01］。结论: APN可显著抑制H/R损伤诱导的心肌细胞凋亡,促进心肌细胞存活,其拮抗作用与上调APPL1蛋白的表达相关。     

缺氧后处理对缺氧复氧心肌线粒体活性氧及细胞凋亡的影响

目的 观察缺氧后处理对缺氧复氧心肌线粒体活性氧及细胞膜和线粒体Bcl-2和Bax蛋白表达的影响,探讨其调控心肌细胞凋亡的机制.方法 构建大鼠乳鼠心肌细胞缺氧复氧损伤模型,将细胞分为对照组、缺氧/复氧纽(缺氧3h后复氧6h)、缺氧后处理组(缺氧3h后行复氧5min、缺氧5 min,反复3次,再复氧6 h).应用荧光酶标仪测定线粒体活性氧量,流式细胞仪检测心肌细胞凋亡,Western blot检测细胞膜和线粒体Bcl-2和Bax蛋白的表达.结果 缺氧/复氧组和缺氧后处理组心肌细胞线粒体活性氧量较对照组显著升高(P＜0.01).缺氧后处理组心肌细胞线粒体平均荧光强度为30.74±1.88a.u./μg,显著低于缺氧/复氧组(63.17±2.75a.u./μg,P＜0.01),仍高于对照组(14.41±2.15a.u./μg).缺氧/复氧组和缺氧后处理组心肌细胞凋亡率较对照组显著升高(45.86％±3.29％和26.99％±3.35％比5.72％±1.63％,P＜0.01),缺氧后处理组低于缺氧/复氧组(P＜0.01).细胞膜和线粒体Bcl-2蛋白在缺氧后处理组显著上调,在缺氧/复氧组显著下调;Bax蛋白在缺氧后处理组显著下调,在缺氧/复氧组显著上调.结论 缺氧后处理抑制线粒体活性氧爆发,减轻缺氧/复氧诱导的心肌细胞凋亡,其抗凋亡机制可能与线粒体和细胞膜Bcl-2蛋白表达上调及Bax蛋白表达下调有关.     

Adiponectin 通过FoxO1信号通路减轻阿霉素细胞毒性的作用机制研究

目的 阐明FoxO1在脂联素（Adiponectin,APN）减轻阿霉素（Doxorubicin,DOX）心肌细胞毒性中的作用及机制。 方法 将分离的乳鼠心肌原代细胞（Neonatal rat cardiomyocytes, nrCMs）随机分为对照组（CON）、APN处理组（APN）、DOX损伤组（DOX）、APN保护组（APN-DOX）、DOX损伤+Scramble siRNA组（DOX-Scramble siRNA）、DOX-FoxO1 siRNA组、APN-DOX-Scramble siRNA组、APN-DOX-FoxO1 siRNA组。以CCK-8试剂盒检测细胞活力、ATP检测试剂盒检测线粒体ATP生成、ROS检测试剂盒检测ROS生成量、Western blot检测自噬标志蛋白的表达情况。 结果 DOX处理后较CON组,细胞活力显著降低（P<0.05）,线粒体ATP生成受到抑制,同时ROS生成量显著增加,自噬被显著激活（P<0.05）;APN预处理可通过抑制自噬而显著降低DOX诱导的心肌细胞毒性（P<0.05）,APN可通过上调phospho-FoxO1的表达而抑制自噬的激活,从而保护nrCMs细胞免受DOX诱导的心肌细胞毒性损伤,APN的心肌保护作用可被FoxO1 siRNA而抑制,如自噬过程的激活及ATP生成受到抑制,同时ROS生成量显著增加。 结论 APN通过上调FoxO1磷酸化水平,抑制自噬,进而缓解DOX引起的心肌细胞毒性。