PM2.5通过p38 MAPK信号通路影响血管平滑肌细胞增殖和迁移

目的:研究细颗粒物(PM2.5)对血管平滑肌细胞增殖和迁移的影响,以及p38 MAPK信号通路在其中的作用。方法:体外培养人血管平滑肌细胞,分为对照组和不同浓度PM2.5染毒组,分别用PBS及6.25、12.5和25 mg/L的PM2.5作用于细胞,用CCK-8法和EdU染色法检测细胞增殖能力的变化,用划痕实验和Transwell法检测细胞的迁移能力,然后根据结果选取PM2.5最强作用浓度染毒细胞,在不同时点用Western blot法检测p38MAPK信号分子的磷酸化改变,并观察用特异性抑制剂阻断p38 MAPK信号后细胞在PM2.5刺激下的增殖和迁移情况。结果:与对照组比较,PM2.5染毒可明显促进血管平滑肌细胞的增殖和迁移能力,在设定的浓度范围内以12.5 mg/L浓度组的作用最为明显(P<0.05)。Western blot结果显示,12.5 mg/L PM2.5染毒可上调血管平滑肌细胞p38 MAPK的磷酸化水平;而加入p38 MAPK抑制剂SB203580预处理后,PM2.5诱导的细胞增殖和迁移明显受到抑制,说明p38 MAPK可能介导PM2.5的毒性作用。结论:PM...     

黄芩苷通过上调miR-126基因抑制乳腺癌细胞增殖北大核心CSCD

目的:探讨黄芩苷调节miR-126基因对乳腺癌细胞增殖的影响。方法:在乳腺癌细胞MCF-7内进行不同浓度黄芩苷与miR-126 mimic处理,使用CCK-8、MTT、Transwell与流式细胞术(FCM)分别检测细胞活性、生存率、侵袭与转移、凋亡率;免疫荧光技术(IF)、qRT-PCR和Western blot检测细胞中VEGF与TGF-β表达。结果:CCK-8、qRT-PCR、Western blot和IF检测结果表明,本实验中黄芩苷的适宜浓度为50μg/ml。过表达miR-126可显著影响MCF-7细胞的活性、迁移、侵袭和凋亡率。同时,与黄芩苷+NC组和miR-126 mimic组相比,黄芩苷+miR-126组MCF-7细胞活性显著降低。结论:黄芩苷可抑制乳腺癌细胞的增殖,可能与黄芩苷上调miR-126基因有关。     

叶酸通过下调ERK1/2信号通路抑制血管平滑肌细胞增殖和迁移

目的:探讨叶酸(folic acid,FA)对血管平滑肌细胞(VSMCs)增殖和迁移的影响及其机制。方法:取SD大鼠的主动脉,采用组织贴块法培养VSMCs,随机分组进行实验。采用CCK-8和Ed U法检测叶酸对VSMCs活力和增殖能力的影响。采用划痕实验和Transwell法检测叶酸对VSMCs迁移和侵袭的影响。采用Western blot法检测细胞增殖核抗原(PCNA)蛋白表达以及血小板源性生长因子受体(PDGFR)和细胞外信号调节激酶1/2(ERK1/2)蛋白的磷酸化水平。结果:叶酸抑制血小板源性生长因子(PDGF)诱导的VSMCs的活力,并呈浓度依赖性(P0.05)。叶酸抑制PDGF诱导的VSMCs的迁移,并呈浓度依赖性(P0.05)。叶酸降低PCNA表达和PDGFR磷酸化水平,并抑制PDGF激活的ERK1/2信号通路。结论:叶酸降低PDGF诱导的VSMCs PCNA和p-PDGFR蛋白水平,下调ERK1/2信号通路,从而抑制VSMCs的增殖和迁移。     

IL-38拮抗RhoA/ROCK信号抑制PDGF-BB诱导的血管平滑肌细胞增殖和迁移

目的探究白细胞介素(IL)-38对血小板源性生长因子-BB(PDGF-BB)诱导的血管平滑肌细胞增殖和迁移的作用和机制。方法将人主动脉血管平滑肌细胞(HA-VSMC)随机分成4组:对照组(不进行任何处理)、PDGF-BB组(加入20 ng/ml重组人PDGF-BB蛋白处理24 h)、PDGF-BB+空质粒组(转染pcDNA3.1空质粒48 h后加入20 ng/ml重组人PDGF-BB蛋白处理24 h)和PDGF-BB+IL-38组(转染pcDNA3.1-IL-38质粒48 h后加入20 ng/ml重组人PDGF-BB蛋白刺激24 h)。MTT法检测细胞活力、Transwell检测细胞迁移、Western blot检测增殖细胞核抗原(PCNA)、RhoA、Rho相关蛋白激酶(ROCK)1、ROCK2、肌球蛋白磷酸酶靶标亚基1(MYPT1)和磷酸化MYPT(p-MYPT)蛋白水平的表达。结果与对照组相比,PDGF-BB组中细胞活力,迁移细胞数目,PCNA、RhoA、ROCK1、ROCK2的表达和p-MYPT/MYPT1的值均增加,差异均具有统计学意义(均P0.05);与PDGFBB组相比,PDGF-BB+空质粒组中这些指标变化无统计学意义(均P0.05);与PDGF-BB+空质粒组相比,PDGF-BB+IL-38组中细胞活力,迁移细胞数目,PCNA、RhoA、ROCK1、ROCK2的表达和p-MYPT/MYPT1的值均降低,差异均具有统计学意义(均P0.05)。结论 IL-38能够减弱PDGF-BB诱导的血管平滑肌细胞增殖和迁移,这种作用可能是通过抑制RhoA/ROCK通路活化发挥作用的。     

AngⅡ促进大鼠血管平滑肌细胞增殖和迁移

血管平滑肌细胞(vascular smooth muscle cells,VSMCs)的增殖、迁移和细胞外基质的合成是高血压、动脉粥样硬化和血管成形术后再狭窄等血管重塑性疾病发生、发展的重要细胞病理学基础[1].血管紧张素Ⅱ(angiotensinⅡ,AngⅡ)的促生长作用参与了高血压、动脉粥样硬化、血管再狭窄等血管增殖性疾病的发生和发展.本实验观察AngⅡ对VSMCs细胞增殖及迁移的影响,进一步阐明血管增殖性疾病的发病机理,为临床防治提供理论依据.1材料与方法1.1细胞培养与试剂:80～100 g健康雄性SD大鼠,取胸腹主动脉血管中膜用贴块法分离、培养VSMCs[2].取3～6代细胞进行实验.待细胞生长至70％～80％汇合后换用无血清培养液饥饿培养16 h,使细胞处于静止期,然后换用含2％FBS的培养液,分别加入不同浓度(10-8、10-7和10-6 mol/L)的AngⅡ(Sigma公司)孵育24h,或10-7 mol/L的AngⅡ孵育不同时间(3、6、12、24和48 h),收集细胞用于实验.     

阿糖胞苷通过调控miR-126表达抑制急性髓系白血病细胞增殖及诱导细胞凋亡的分子机制研究北大核心CSCD

目的:探讨阿糖胞苷是否可通过调控微小RNA-126(miR-126)表达抑制急性髓系白血病细胞增殖及诱导细胞凋亡。方法:体外培养急性髓系白血病细胞HL-60,分别加入不同浓度的阿糖胞苷处理;采用甲基噻唑基四唑(MTT)检测细胞增殖;流式细胞术检测细胞凋亡;实时荧光定量聚合酶链反应(qRT-PCR)检测miR-126的表达量;分别将miR-126 mimics、antimiR-126转染至HL-60细胞,采用上述方法检测细胞增殖及凋亡;Western blot检测增殖标记蛋白细胞增殖核抗原67(Ki67)、活化的含半胱氨酸的天冬氨酸蛋白水解酶3(Cleaved-caspase-3)与磷脂酰肌醇-3-激酶(PI3K)/蛋白激酶B(AKT)信号通路相关蛋白磷酸化磷脂酰肌醇-3-激酶(p-PI3K)、磷酸化蛋白激酶B(p-AKT)的表达量。结果:阿糖胞苷可显著降低细胞增殖率(P<0.05),增高细胞凋亡率(P<0.05),抑制Ki67、p-PI3K、p-AKT表达(P<0.05),促进miR-126、Cleaved-caspase-3表达(P<0.05);转染miR-126 mimics后,细胞增殖率显著降低(P<0.05),细胞凋亡率显著升高(P<0.05),Ki67蛋白水平显著降低(P<0.05),Cleavedcaspase-3蛋白水平显著升高(P<0.05),而转染anti-miR-126的作用与之相反;转染anti-miR-126可降低阿糖胞苷对HL-60细胞增殖及凋亡的作用,并可促进p-PI3K、p-AKT的表达(P<0.05)。结论:阿糖胞苷可能通过上调miR-126表达及抑制PI3K/AKT信号通路的活化从而抑制急性髓系白血病细胞增殖及诱导细胞凋亡。     

miR-214通过MAPK信号通路对非小细胞肺癌放疗敏感性的影响

目的：探讨miR-214通过MAPK信号通路对非小细胞肺癌放疗敏感性的影响。方法：体外培养构建放射抵抗性的肺癌H358细胞株（H358-RR）;qPCR实验检测H35和H358-RR细胞中miR-214的表达水平,qPCR检测miR-214-mimic在H358-RR中的转染效率及miR-214的表达情况;Western blot检测miR-214-mimic对ERK1、jnk和p38MAPK蛋白表达水平的影响;免疫荧光检测γ-H2AX聚集点的情况及对放射的敏感性;CCK-8实验检测H358-RR细胞株接受放射后活性的变化;单细胞凝胶电泳检测放射线照射后不同组肺癌细胞DNA损伤情况。结果：成功构建H358-RR放射抵抗细胞株,qPCR检测H358-RR细胞中miR-214的表达水平高于H358细胞,qPCR检测miR-214-mimic的转染效率良好,可以有效增加miR-214的表达水平,Western blot检测转染miR-214-mimic后ERK1、jnk和p38MAPK的表达水平相应升高;过表达miR-214之后,免疫荧光检测γ-H2AX聚集点的表达明显较少,DNA损伤较少;过表达miR-214后,H358-RR细胞接受放射后细胞活力降低水平减少;过表达miR-214后H358-RR抵抗放射线及对DNA损伤修复的能力增强。结论：miR-214通过影响MAPK信号通路调控非小细胞肺癌的DNA损伤及修复能力,影响其对放疗的敏感性。     

Src/Stat3通路在高糖诱导的血管平滑肌细胞增殖及迁移中的作用

目的:探讨Src酪氨酸激酶(Src)/信号转导子和转录激活子3(Stat3)在高糖(HG)诱导的血管平滑肌细胞(VSMCs)增殖和迁移中的作用。方法:首先将VSMC细胞株A7R5与HG(10~40 mmol/L)共同孵育24h,MTT法及EdU染色检测VSMCs增殖,Transwell小室检测VSMCs迁移,Western blot检测p-Src、Src、p-Stat3和Stat3的蛋白水平。q PCR检测Stat3靶基因细胞周期蛋白D1(cyclin D1)、Myc、基质金属蛋白酶2(MMP2)及基质金属蛋白酶9(MMP9)的表达。为了进一步证实Src在高糖诱导VSMCs增殖和迁移中的作用,将HG与Src抑制剂saracatinib(100 nmol/L)共同孵育24 h,观察Src对HG诱导VSMCs增殖、迁移及Stat3激活的影响。结果:HG能浓度依赖性地促进VSMCs的增殖及迁移并激活Src和Stat3,上调Stat3靶基因cyclin D1、Myc、MMP2及MMP9的表达。抑制Src激活可抑制HG诱导的VSMCs增殖及Stat3的激活,同时下调cyclin D1及Myc的表达。结论:Src/Stat3通路可能在HG诱导的VSMCs增殖及迁移中发挥重要作用。     

Rap1 promotes proliferation and migration of vascular smooth muscle cell via the ERK pathway

Background

Rap1 is involved in a multitude of cellular signal transduction pathways, which has extensively been linked to cell proliferation and migration. It has been shown to be important in the regulation of physiological and pathological processes. The present study aims to elucidate its detailed mechanistic in proliferation and migration.

CaN-NFAT信号通路参与苯肾上腺素介导的血管平滑肌细胞增殖

目的 研究钙调神经磷酸酶-活化T细胞核因子(CaN-NFAT)信号通路对苯肾上腺素诱导的血管平滑肌细胞(VSMCs)增殖的调节作用。方法：组织贴块法原代培养SD大鼠血管平滑肌细胞,MTT法和细胞计数法测定VSMCs增殖,间接免疫荧光法测定NFATc1细胞定位,Western blot测定CaN蛋白表达,定磷法检测CaN活性。结果：苯肾上腺素(PE,α1-受体激动剂)促进VSMCs增殖,哌唑嗪(prazosin,α1-受体抑制剂)和环胞霉素A(CsA,CaN抑制剂)降低PE诱发的VSMCs增殖,白屈菜红碱(chelerythrine,蛋白激酶C抑制剂)预处理VSMCs后,PE诱发的VSMCs吸光度和细胞数被抑制, 并且这种抑制作用可以被CsA进一步加强。CsA抑制PE诱发的CaN表达与活性。PE促进NFATc1从胞质易位入核,CsA抑制NFATc1核转位。结论：CaN-NFATc1信号通路参与调节苯肾上腺素诱导的VSMCs增生肥大。     

载脂蛋白（a）对血管平滑肌细胞增殖及其信号通路的影响

目的： 探讨载脂蛋白（a）［apo（a）］对血管平滑肌细胞增殖的影响及其机制。方法：原代培养血管平滑肌细胞并给予传代以进行实验，并采用α-actin抗体进行免疫组化细胞鉴定；分别给予apo（a）、apo（a）+整合素αⅤβ3单克隆抗体LM609及单独LM609干预细胞，采用细胞计数和MTT实验观察细胞增殖情况，采用Western blotting分析相关信号蛋白的变化。结果：所用实验细胞经鉴定均为血管平滑肌细胞；apo（a）能促进血管平滑肌细胞增殖，但这一作用能被整合素αⅤβ3单克隆抗体LM609所对抗，单独的LM609干预对细胞生长并无影响；Western blotting显示apo（a）能促进黏附斑激酶（FAK）磷酸化，并使总的转化生长因子β1（TGF-β1）及其磷酸化形式均表达减少，而LM609能对抗apo（a）的这些作用。结论：Apo（a）促进血管平滑肌细胞增殖的作用是通过整合素αⅤβ3介导的， 以致FAK活化，进而TGF-β1表达及磷酸化均减少。     

TSC-36/FRP inhibits vascular smooth muscle cell proliferation and migration

OBJECTIVE: In-stent restenosis is a vascular proliferation/migration disorder characterized by hyperplasia of vascular smooth muscle cells (VSMCs). Because mounting evidence suggests that the therapeutic potential of anti-proliferation and anti-migration therapy, we investigated possible inhibitory effects of the matricellular protein TGF-beta-stimulated clone 36 (TSC-36) on vascular smooth muscle cell proliferation and migration in vitro and in vivo. METHODS: Human umbilical artery smooth muscle cells (SMCs) were treated with inducting agents daidzein or estradiol. TSC-36 expression was detected by nested competitive PCR and in situ hybridization. TSC-36 was expressed in Origami (DE3) cells. The recombinant protein was used to immunize rabbits to produce polyclonal antibodies. VSMCs were treated with various concentrations of recombinant TSC-36 (rTSC-36) protein and daidzein. The MTT assay was used to analyze for cell proliferation. A transwell system was used to detect cell migration. Flow cytometry was used to detect cell phase. A rat carotid artery balloon injury model was duplicated. The rats were treated with daidzein or solvent control. Animals were sacrificed 5 weeks later, and injured arteries were taken for pathology and histology. RESULTS: TSC-36 mRNA and protein expression was induced in SMCs. Cell proliferation and migration were inhibited by rTSC-36. rTSC-36 caused accumulation of SMCs in G2 phase. The inducting agent daidzein decreased neo-intima proliferation. TSC-36 mRNA and protein expression was induced and expressed in the neo-intima. CONCLUSION: TSC-36 can be induced in VSMCs and inhibits VSMCs proliferation in vitro and in vivo.     

Emerging regulators of vascular smooth muscle cell migration

Journal of Muscle Research and Cell Motility - Vascular smooth muscle cells (VSMCs) are the predominant cell type in the blood vessel wall and normally adopt a quiescent, contractile phenotype....     

Smad通路参与ERK通路诱导血管平滑肌细胞增殖的过程

目的： 探讨Smad通路是否参与细胞外信号调节激酶(ERK)通路诱导血管平滑肌细胞（VSMCs）增殖的过程及其可能机制。方法：将人脐动脉平滑肌细胞（hUASMCs）分为对照组、血小板源性生长因子（PDGF）组、ERK阻断剂组和PDGF+ERK阻断剂组。用MTT法测hUASMCs的增殖活性(A值)，用免疫组化法测hUASMCs内细胞核增殖抗原（PCNA）、磷酸化ERK和磷酸化Smad蛋白的表达，用RT-PCR法测hUASMCs内Smad2/3 mRNA的表达。结果：PDGF组hUASMCs的增殖活性(A值)及hUASMCs内的PCNA、磷酸化ERK和磷酸化Smad2/3蛋白的表达都明显高于其它各组(P<0.01)；各组hUASMCs内Smad2/3 mRNA的表达没有差异。结论： Smad通路可在蛋白水平参与ERK通路诱导VSMCs的增殖过程。     

MicroRNA 181b promotes vascular smooth muscle cells proliferation through activation of PI3K and MAPK pathways

Vascular smooth muscle cells (VSMCs) hyperplasia is a common feature of pathologic cardiovascular event such as restenosis and atherosclerosis. The role and mechanisms of microRNAs (miRs) in VSMCs proliferation are poorly understood. Here, we report that miR-181b promotes VSMCs proliferation and migration. In an animal model, miR-181b was significantly increased in the rat carotid artery after balloon catheter injury. Delivery of miR-181b inhibitor to injured artery exhibited a marked inhibition of neointimal hyperplasia. Transfection of miR-181b with “mimics” to A10 cells accelerated cell proliferation, which was accompanied by an increase of cell migration. The induction of A10 cells proliferation by miR-181b appeared to be involved in activation of S and G2/M checkpoint, concomitant with decreases in cell-cycle inhibitors p21 and p27, and increases in cell-cycle activators CDK4 and cyclinD1. In contract, miR-181b inhibition attenuated A10 cells proliferation, inhibited cell migration and arrested cell cycle transition. Moreover, forced miR-181b expression elevated the phosphorylation levels of Akt and Erk1/2, whereas inhibition of miR-181b produced the opposite effects. Additionally, inhibition of PI3K and MAPK signaling pathways with specific inhibitors, but not inhibition of JNK pathway, significantly abolished the effects of miR-181b in promoting cell proliferation. These findings demonstrate that miR-181b enhances the proliferation and migration of VSMCs through activation of PI3K and MAPK pathways.