lncRNA PCAT19靶向miR-143-3p通过信号通路PI3K/Akt对甲状腺癌细胞增殖和凋亡的影响及机制

目的探讨lncRNA PCAT19对甲状腺癌细胞增殖和凋亡的影响及作用机制。方法实验分为miR-con组、miR-143-3p组、si-con组、si-PCAT19组、pcDNA组、pcDNA-PCAT19组、si-PCAT19+anti-miR-con组、si-PCAT19+anti-miR-143-3p组、miR-con+WT-PCAT19组、miR-con+MUT-PCAT19组、miR-143-3p+WT-PCAT19组、miR-143-3p+MUT-PCAT19组。qRT-PCR检测miR-143-3p和PCAT19的表达水平;Western印迹检测蛋白表达;MTT法检测细胞存活率;流式细胞术检测细胞凋亡;双荧光素酶报告实验检测PCAT19和miR-143-3p的靶向关系。结果相较于正常甲状腺细胞HT-ori3,甲状腺癌细胞BCPAP、TPC-1、SW1736中PCAT19的表达水平显著升高,miR-143-3p的表达水平显著降低(P<0.05)。敲低PCAT19和高表达miR-143-3p抑制甲状腺癌细胞BCPAP增殖,促进细胞凋亡;促进裂解的半胱氨酸天冬氨酸蛋白酶(Cleaved-caspase)-3蛋白的表达,抑制细胞周期蛋白(Cyclin)D1的表达。PCAT19靶向负调控miR-143-3p,miR-143-3p低表达可以部分逆转PCAT19低表达对BCPAP细胞增殖抑制和凋亡促进的作用。敲低PCAT19抑制p-AKT和磷脂酰肌醇3-激酶的p1102催化亚基(PI3Kp110α)的表达,miR-143-3p低表达可逆转PCAT19低表达对p-AKT和PI3Kp110α的抑制作用。结论lncRNA PCAT19可抑制甲状腺癌细胞增殖,促进其凋亡,其机制可能与miR-143-3p及PI3K/AKT信号通路有关。     

DIDS对十字孢碱诱导心肌细胞凋亡中磷脂酰肌醇3激酶/蛋白激酶B信号转导的影响

目的探讨氯离子通道阻断剂DIDS对十字孢碱诱导心肌细胞凋亡与磷脂酰肌醇3激酶/蛋白激酶B信号及其下游分子一氧化氮合酶/一氧化氮的关系。方法实验分为对照组、十字孢碱组、DIDS组、LY294002(特异性磷脂酰肌醇3激酶抑制剂)组和L-NAME(非特异性一氧化氮合酶抑制剂)组。在十字孢碱诱导心肌细胞凋亡模型上,观察DIDS对心肌细胞存活率、凋亡和磷脂酰肌醇3激酶/蛋白激酶B及其下游分子一氧化氮合酶/一氧化氮的影响。结果与十字孢碱组比,DIDS明显改善了细胞存活率,提高了细胞磷酸化蛋白激酶B活性2.1倍(P<0.01),增加了一氧化氮合酶和磷酸化一氧化氮合酶的水平和一氧化氮水平(P<0.01);LY294002预处理完全抑制了磷酸化蛋白激酶B、一氧化氮合酶和磷酸化一氧化氮合酶水平的升高及升高的一氧化氮,完全阻断了DIDS的抗细胞凋亡作用;L-NAME预处理也使升高的一氧化氮水平下降,但仅部分阻断了DIDS的细胞保护作用。结论DIDS通过激活磷脂酰肌醇3激酶/蛋白激酶B信号通路发挥其抑制十字孢碱诱导的心肌细胞凋亡作用。     

硼替佐米抑制PI3K/Akt通路增强胃癌细胞对TRAIL诱导凋亡的敏感性

目的:研究硼替佐米对TRAIL诱导胃癌细胞凋亡的影响, 探讨PI3K/Akt通路在TRAIL诱导凋亡中的作用.方法:不同浓度的TRAIL和/或硼替佐米作用于人胃癌细胞系MGC803细胞, MTT法检测细胞存活率, 流式细胞术PI染色检测细胞凋亡.Western blot法检测caspase裂解及p-Akt表达水平的变化.结果:50 nmol/L硼替佐米预处理细胞2 h, 之后予100 μg/L TRAIL继续作用24 h, 细胞存活率明显低于TRAIL单独处理组(35.1%±2.7% vs71.0%±4.3%, P <0.01); 细胞凋亡率明显高于TRAIL单药组(31.3%±2.0% vs 8.2%±0.8%,P <0.01). 20 nmol/L硼替佐米预处理未能增强细胞对TRAIL的敏感性. 进一步研究发现,TRAIL可活化PI3K/Akt通路, 硼替佐米预处理可阻止PI3K/Akt通路的活化, 进而增强细胞对TRAIL诱导凋亡的敏感性.结论:硼替佐米通过抑制TRAIL诱导的PI3K/Ak t通路活化, 增强胃癌MGC803细胞对TRAIL诱导凋亡的敏感性.     

β-榄香烯对肾癌786-0细胞凋亡的影响及其机制探讨

目的观察β-榄香烯对肾癌786-0细胞凋亡的影响,并探讨其可能机制。方法使用不同浓度β-榄香烯作用于786-0细胞24 h,MTT法检测细胞活力,流式细胞术检测细胞凋亡率,W estern b lot法检测细胞内磷酸化蛋白激酶B（p-Akt）及总Akt。结果随β-榄香烯浓度增大,细胞存活率逐渐降低,细胞凋亡率明显增加,细胞内p-Akt表达水平逐渐降低,均呈一定浓度依赖性（P均〈0.05）。结论β-榄香烯可诱导肾癌细胞凋亡,其机制可能为抑制PI3K/Akt通路活性。     

Equol inhibits proliferation of human gastric carcinoma cells via modulating Akt pathway

AIM: To investigate the anti-tumor effects of equol in gastric cancer cells and the underlying molecular mechanisms.METHODS: MGC-803 cells were employed for in vitro experiments in this study. Cells were treated with control(vehicle,0.1% DMSO) or equol under specified dose titration or time courses. Cell viability was examined by MTS assay,and the levels of Ki67 were determined by q PCR and immunofluorescent assay. Changes in cell cycle distribution and apoptosis rate were detected by flow cytometry. The m RNA expression of cyclin E1 and P21WAF1 was determined by q PCR. The protein levels of cell cycle regulators,PARP and Caspase-3 cleavage,and the phosphorylation of Akt were examined by Western blot. In addition,to characterize the role of elevated Akt activation in the anti-tumor effect exerted by equol,Ly294002,a PI3K/AKT pathway inhibitor,was used to pretreat MGC-803 cells. RESULTS: Equol(5,10,20,40,or 80 μmol/L) inhibited viability of MGC-803 cells in a dose- and timedependent manner after treatment for 24,36,or 48 h(P 0.05 for all). Equol also decreased the m RNA(P 0.05 for 12 and 24 h treatment) and protein levels of Ki67. Equol treatment significantly induced G0/G1 cell cycle arrest(P 0.05),with the percentages of G0/G1 cells of 32.23% ± 3.62%,36.31% ± 0.24%,45.58% ± 2.29%,and 65.10% ± 2.04% for equol(0,10,20,or 30 μmol/L) treatment,respectively,accompanied by a significant decrease of CDK2/4(P 0.05 for 24 and 48 h treatment) and Cyclin D1/Cyclin E1(P 0.05),and an increased level of P21WAF1(P 0.05). A marked increase of apoptosis was observed,with the percentages of apoptotic cells of 5.01% ± 0.91%,14.57% ± 0.99%,37.40% ± 0.58%,and 38.46% ± 2.01% for equol(0,5,10,or 20 μmol/L) treatment,respectively,accompanied by increased levels of cleaved PARP and caspase-3. In addition,we found that equol treatment increased P-Akt(Ser473 and Thr308) at 12 and 24 h compared to vehicle-treated control; longer treatment for 48 h decreased P-Akt(Ser473 and Thr308). P-Akt at Thr450,however,was decreased by equol treatment at all time points examined(P 0.05 for all). Moreover,Akt inhibition by Ly294002 could not prevent but led to enhanced G0/G1 arrest and apoptosis. CONCLUSION: Equol inhibits MGC-803 cells proliferation by induction of G0/G1 arrest and apoptosis. Its anti-cancer effects are likely mediated by dephosphorylation of Akt at Thr450.     

铜绿假单胞菌注射液对肺癌A549细胞自噬及PI3 K/Akt通路的影响

目的探究铜绿假单胞菌注射液(PA-MSHA)对肺癌A549细胞自噬及磷脂酰肌醇-3激酶(PI3K)/蛋白激酶B(Akt)通路的影响。方法体外培养人肺癌A549细胞,随机分为空白对照组、LY294002组(加入20μmol/L LY294002),PA-MSHA干预组(加入0.5×10^9/mL、1.0×10^9/mL、2.0×10^9/mL PA-MSHA)。干预培养48 h后,MTT法检测各组细胞活性,平板克隆形成实验检测各组细胞增殖能力,透射电子显微镜观察各组细胞自噬情况,Western blot检测各组细胞中自噬相关蛋白p62、LC3Ⅰ、LC3Ⅱ及PI3K/Akt通路相关蛋白PI3K、Akt、p-PI3K、p-Akt表达。结果与空白对照组相比,LY294002组、0.5×10^9/mL、1.0×10^9/mL、2.0×10^9/mL PA-MSHA组细胞增殖抑制率、LC3Ⅱ/LC3Ⅰ蛋白表达显著升高(P<0.05),自噬体个数增加,细胞克隆形成率、p62、p-PI3K/PI3K、p-Akt/Akt蛋白表达显著降低(P<0.05);与LY294002组相比,0.5×10^9/mL、1.0×10^9/mL PA-MSHA组细胞增殖抑制率、LC3Ⅱ/LC3Ⅰ蛋白表达显著降低(P<0.05),自噬体个数减少,细胞克隆形成率、p62、p-PI3K/PI3K、p-Akt/Akt蛋白表达显著升高(P<0.05);与0.5×10^9/mL、1.0×10^9/mL PA-MSHA组相比,2.0×10^9/mL PA-MSHA组细胞增殖抑制率、LC3Ⅱ/LC3Ⅰ蛋白表达显著升高(P<0.05),自噬体个数增加,细胞克隆形成率、p62、p-PI3K/PI3K、p-Akt/Akt蛋白表达显著降低(P<0.05)。结论PA-MSHA可能通过调控PI3K/Akt信号通路,促进肺癌A549细胞自噬,抑制细胞增殖。     

PI3K/Akt抑制剂LY294002对胃癌细胞化疗增敏作用的探讨

目的 探讨PI3K/Akt特异性抑制剂LY294002与化疗药物5-Fu及奥沙利铂联合使用对3种胃癌细胞系(MGC803、BGC823和SGC7901)化疗效果的影响.方法 将PI3K/Akt特异性抑制剂LY294002联合化疗药物5-Fu及奥沙利铂作用于3种胃癌细胞系,MTT法检测单独使用5-Fu、奥沙利铂及联合LY294002对体外培养的3种胃癌细胞系的增殖抑制作用,流式细胞术检测细胞凋亡.结果 联合LY294002作用后,5-Fu、奥沙利铂对3种胃癌细胞系的增殖抑制作用明显增强(P<0.05),且凋亡率显著提高(P<0.05).结论结果 LY294002能有效提高化疗药物5-Fu、奥沙利铂体外对胃癌细胞的增殖抑制作用,抑制PI3K/Akt信号转导通路可显著提高胃癌的化疗疗效.     

MicroRNA-24 attenuates vascular remodeling in diabetic rats through PI3K/Akt signaling pathway

Background and aimsThe vascular remodeling plays a crucial role in pathogenesis of diabetic cardiovascular complications. In this study, we intended to explore the effects and potential mechanisms of microRNA-24 (miR-24) on vascular remodeling under diabetic conditions.Methods and ResultsMiR-24 recombinant adenovirus (Ad-miR-24-GFP) was used to induce miR-24 overexpression either in carotid arteries or high glucose (HG)-induced vascular smooth muscle cells (VSMCs). Cell proliferation was analyzed using CCK-8 method. Cell migration was examined using wound-healing and transwell assay. mRNA and protein expressions of critical factors were, respectively, measured by real-time PCR and western blot as follows: qRT-PCR for the levels of miR-24, PIK3R1; western blot for the protein levels of PI3K (p85α), Akt, p-Akt, mTOR, p-mTOR, 4E-BP1, p-4E-BP1, p70s6k, p-p70s6k, MMP 2, MMP 9, collagen Ⅰ, as well as collagen Ⅲ. Carotid arteries in diabetic rats suffered balloon injury were harvested and examined by HE, immunohistochemical and Masson trichrome staining.The expression of miR-24 was decreased in HG-stimulated VSMCs and balloon-injured carotid arteries of diabetic rats, accompanied by increased mRNA expression of PIK3R1. The up-regulation of miR-24 suppressed VSMCs proliferation, migration, collagen deposition not only induced by HG in vitro, but also in balloon-injured diabetic rats, which were related to inactivation of PI3K/Akt signaling pathway.ConclusionThe up-regulation of miR-24 significantly attenuated vascular remodeling both in balloon-injured diabetic rats and HG-stimulated VSMCs via suppression of proliferation, migration and collagen deposition by acting on PIK3R1 gene that modulated the PI3K/Akt/mTOR axes.     

miR-200c-3p靶向XIAP调控缺氧复氧诱导的心肌细胞凋亡

目的探讨miR-200c-3p对缺氧复氧心肌细胞凋亡的影响及作用机制。方法构建缺氧复氧(H/R)H9c2细胞。运用实时荧光定量反转录聚合酶链反应(qRT-PCR)法检测细胞中miR-200c-3p、X连锁凋亡抑制蛋白(XIAP)信使核糖核酸(mRNA)的表达。将H9c2细胞分为H/R+anti-miR-NC组(转染anti-miR-NC)、H/R+anti-miR-200c-3p组(转染anti-miR-200c-3p)、H/R+pcDNA组(转染pcDNA)、H/R+pcDNA-XIAP组(转染pcDNA-XIAP)、H/R+anti-miR-200c-3p+si-NC组(共转染anti-miR-200c-3p和si-NC)、H/R+anti-miR-200c-3p+si-XIAP组(共转染anti-miR-200c-3p和si-XIAP),用脂质体法转染至H9c2细胞,再进行缺氧复氧处理。免疫印迹(Western blot)、噻唑蓝(MTT)、流式细胞术检测细胞中XIAP、半胱氨酸天冬氨酸蛋白酶(Caspase-3)、裂解的半胱氨酸天冬氨酸蛋白酶(cleaved Caspase-3)、B细胞淋巴瘤/白血病2 X蛋白(Bax)、B细胞淋巴瘤/白血病2(Bcl-2)的表达、细胞增殖、细胞凋亡;双荧光素酶报告基因检测实验检测细胞中miR-200c-3p与XIAP的结合力。结果成功构建缺氧复氧H9c2细胞;与正常培养的H9c2细胞比较,H/R组H9c2细胞中miR-200c-3p表达明显上调,XIAP表达明显下调;抑制miR-200c-3p、过表达XIAP均可抑制H/R H9c2细胞的凋亡,下调cleaved Caspase-3、Bax,上调Bcl-2;miR-200c-3p可显著抑制XIAP 3′UTR野生型报告基因活性,并负向调控XIAP的表达;敲减XIAP可逆转抑制miR-200c-3p对H/R H9c2细胞的凋亡抑制作用。结论 miR-200c-3p可诱导缺氧复氧心肌细胞的凋亡,其机制与靶向XIAP有关,可为心血管疾病的治疗提供新靶点。     

胃安宁含药血清对人胃癌MGC-803细胞增殖及凋亡的影响

[目的]研究胃安宁颗粒含药血清体外对人胃癌MGC-803细胞株增殖、凋亡的影响.[方法]采用MTT比色法检测不同剂量胃安宁颗粒含药血清作用12 h、24 h、48 h后对MGC-803细胞生长增殖的影响,流式细胞仪检测细胞凋亡率.[结果]随着胃安宁颗粒含药血清浓度逐渐增加,细胞增殖率逐渐降低,细胞抑制率、凋亡率逐渐升高,且以早期凋亡为主.[结论]胃安宁颗粒能够抑制人胃癌MGC-803细胞的增殖,对MGC-803细胞有诱导其早期凋亡作用.     

萝卜硫素通过下调微小核糖酸-22改善缺氧诱导的心肌H9c2细胞凋亡

目的:研究萝卜硫素(SFP)对缺氧诱导心肌H9c2细胞损伤的保护作用及其机制。方法:缺氧条件为94%N2、5%CO2和1%O2,将细胞在缺氧培养箱中培养构建缺氧损伤模型。采用SFP处理细胞后,CCK8法、Western blot实验和流式细胞术检测H9c2细胞活力、增殖及凋亡相关指标;观察SFP对缺氧诱导H9c2细胞损伤的保护机制,采用RT-PCR和Western blot方法分析了SFP对H9c2细胞中miR-22/PI3K/AKT信号通路的影响。结果:缺氧诱导H9c2细胞增殖活力的降低,促使细胞凋亡;SFP能明显增强H9c2细胞增殖活力,降低其凋亡;缺氧诱导H9c2细胞中miR-22表达上调,SFP前处理可以明显抑制miR-22表达;miR-22高表达能降低SFP前处理对缺氧诱导H9c2细胞损伤的保护作用,而miR-22低表达诱导SFP对H9c2细胞损伤的保护效应;SFP可通过下调H9c2细胞中miR-22表达增高PI3K和AKT的磷酸化。结论:SFP前处理通过下调miR-22表达改善缺氧诱导的H9c2细胞损伤,其作用机制与PI3K/AKT信号通路活化有关。     

白芍总苷通过miR-23b-3p/FoxA1对肺炎链球菌诱导的肺泡上皮细胞凋亡的影响

目的 探讨白芍总苷及对肺炎链球菌诱导的肺泡上皮细胞凋亡的影响分子机制.方法 肺泡上皮细胞A549随机分为对照(Con)组、模型(Model)组(1×108 CFU/mL的肺炎链球菌感染)、Model+白芍总苷低、中、高剂量组(17.5 mg/mL、35 mg/mL、70 mg/mL的白芍总苷+1×108 CFU/mL的...     

Downregulation of microRNA-126 in endothelial progenitor cells from diabetes patients, impairs their functional properties, via target gene Spred-1

Diabetes mellitus (DM) adversely affects the number and function of circulating endothelial progenitor cells (EPCs). Consequently, there is also a reduction in the repair mechanism of these cells, which is a critical and initiating factor in the development of diabetic vascular disease. The aim of the present study was to analyze miR expression profiles in EPCs from patients with DM and choose the most significantly regulated miR to study its possible role on EPC dysfunction and elucidate its mechanism of action. EPCs were collected from subjects with Type II DM and non-diabetic control subjects. Total RNA was harvested from EPCs, and a total of 5 candidate miRNAs were identified by microarray screening and were quantified by TaqMan real-time PCR. Lentiviral vectors expressing miR-126 and miR-126 inhibitor (anti-miR-126) were transfected into EPCs, and the EPC colony-forming capacity, proliferation activity, migratory activity, differentiation capacity, and apoptotic susceptibility were determined and Western Blotting and mRNA real-time PCR analyses were performed. To study the mechanisms, lentiviral vectors expressing Spred-1 and a short interfering RNA (siRNA) targeting Spred-1 were prepared. Five miRs were aberrantly downregulated in EPCs from DM patients. These miRs included miR-126, miR-21, miR-27a, miR-27b and miR-130a. Anti-miR-126 inhibited EPC proliferation, migration, and enhanced apoptosis. Restored miR-126 expression in EPCs from DM promoted EPC proliferation, migration, and inhibited EPC apoptosis ability. Despite this, miR-126 had no effect on EPC differentiation. miR-126 overexpression significantly downregulated Spred-1 in EPCs. The knockdown of Spred-1 expression in EPCs from DM promoted proliferation, migration, and inhibited apoptosis of the cells. The signal pathway of miR-126 effecting on EPCs is partially mediated through Ras/ERK/VEGF and PI3K/Akt/eNOS regulation. This study provides the first evidence that miR-126 is downregulated in EPCs from diabetic patients, and impairs EPCs-mediated function via its target, Spred-1, and through Ras/ERK/VEGF and PI3K/Akt/eNOS signal pathway.     

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。     

FGF21 protects human umbilical vein endothelial cells against high glucose-induced apoptosis via PI3K/Akt/Fox3a signaling pathway

Aims

Diabetic macroangiopathy is the main cause of morbidity and mortality in patients with diabetes. Endothelial cell injury is a pathological precondition for diabetic macroangiopathy. Fibroblast growth factor 21 (FGF21) is a key metabolic regulator which has recently been suggested to protect cardiac myocytes and vascular cells against oxidative stress-induced injury in vitro and vivo. In this study, we aimed to investigate the protective capacity of FGF21 in human umbilical vein endothelial cells (HUVECs) against high glucose (HG)-induced apoptosis via phosphatidylinositol-3-kinase/protein kinase B (PI3K/Akt)/FoxO3a pathway.

PI3K／Akt信号途径参与高糖诱导的肾小管上皮细胞转分化及对分化抑制因子2表达的影响

目的观察PI3K／Akt在高糖诱导的肾小管上皮细胞转分化中的作用及对分化抑制因子2（1d2）表达的影响。方法大鼠肾小管上皮细胞随机分成3组：对照（Con）组,高糖（H—Glu）组和PI3K抑制剂Wortmannin（Wort）组。Con组加正常培养液,限GIu组在培养液中加30mmol／L葡萄糖,Wort组用Wortmannin预处理1h后,加30mmol／L葡萄糖。24h后用免疫细胞化学、Western blot法和RT-PCR法检测α平滑肌肌动蛋白（α-SMA）、p-Akt和Id2的表达。结果Con组α-SMA、p-Akt阳性表达细胞很少,绝大部分细胞出现Id2阳性表达。与COn组比较,H-Glu组出现α-SMA和p-Akt表达升高,Id2表达降低（P〈0．05）。与H-Glu组比较,Wort组α-SMA和p-Akt表达下降,Id2表达升高（P〈0．05）。结论PI3K／Akt可能通过抑制Id2基因表达,参与高糖诱导的大鼠肾小管上皮细胞转分化。