反义寡核苷酸抑制血管平滑肌细胞bFGF基因表达

目的：探讨转染反义脱氧寡核苷酸（AODN）对血管平滑肌细胞（VSMCs）碱性成纤维细胞生长因子（bFGF）基因表达的影响机制。方法：使用原位杂交和免疫组化技术检测体外培养的VSMCs中bFGF mRNA和蛋白表达；利用脂质体分别将设计合成浓度为5μmol／L反义（反义组）、正义（正义组）及随机（随机组）脱氧寡核苷酸导入体外培养的VSMCs；应用逆转录PCR和Western Blot半定量测定及计算机图像分析的方法．观测寡核苷酸对bFGF基因表达的影响。结果：体外培养的大鼠VSMCs均有bFGF mRNA和蛋白表达，反义bFGF寡核苷酸作用于VSMCs后1-5d，bFGF mRNA表达和蛋白表达均明显减弱，反义组与对照组比较。mRNA、蛋白表达在第1～5d表达差异均有统计学意义；而正义、随机组无此效应，与单纯脂质体和空白对照组相比差异无统计学意义（P〉0．05）。结论：反义bFGF寡核苷酸对血管平滑肌细胞bFGF基因表达的抑制作用具有序列特异性。     

联合转染PDGF和c-myc反义寡核苷酸抑制移植血管狭窄研究

目的探讨血管移植后联合应用血小板源性生长因子（PDGF）和原癌基因c-myc反义寡核苷酸（AODN）抑制血管平滑肌（VSMC）增殖和防止移植血管狭窄的作用。方法选48只新西兰雄性白兔,随机分为对照组、PDGF-AODN组、c-mycAODN组和PDGF-AODN加c-myc-AODN组,每组12只;将同一只兔的左、右髂外动脉（各1．0cm）对换移植,移植血管用PDGF-AODN和c-myc-AODN液浸泡,血管吻合口用AODN液浸泡过的缝线吻合;取移植血管制片显微镜下观察内膜增生情况,计算机图像分析测量其内膜厚度、内膜面积和移植血管狭窄率,并分别用原位杂交组织化学和免疫组织化学染色计数PDGF和c-myc阳性细胞数。结果PDGF-AODN加c-myc-AODN组的移植血管内膜厚度、内膜面积、管腔狭窄程度和PDGF阳性细胞及C-myc阳性细胞数均显著低于对照组（P〈0．01）,而且亦明显低于单独转染PDGF-AODN组或C-mycAODN组（P〈0．05）,PDGF-AODN组和c-myc-AODN组间差异无统计学意义（P〉0．05）。结论联合应用PDGF-AODN和c-myc-AODN能有效抑制VSMC增殖,阻止内膜增生,防止移植血管狭窄,为利用反义核酸技术联合调控多个基因防止移植器官内血管狭窄提供参考。     

胰岛素-反义c-myb-硫代磷酸寡脱氧核苷酸对大鼠主动脉平滑肌细胞增殖的抑制作用

目的研究新制剂胰岛素 反义c myb 硫代磷酸寡脱氧核苷酸 (PS ODN)对平滑肌细胞增殖的抑制作用。方法大鼠主动脉平滑肌细胞 (SMC)置DMEM中培养。用 2 0 %胎牛血清刺激SMC快速增殖。胰岛素与反义c myb PS ODN在一定条件下 ,如反应液、pH、温度、离子浓度 ,共孵育形成交联物。通过高效液相色谱定性和纯化该交联物。用3H TdR掺入率反映SMC增殖抑制效率。结果在加 2 0 %FBS的DMEM中生长的SMC胰岛素结合力明显增强。交联物胰岛素 反义c myb PS ODN对SMC增殖的抑制作用比单纯反义c myb PS ODN的抑制作用强 ,抑制效率分别为 4 8.3 %和 2 9.5 %。结论胰岛素受体靶向途径可能为一种治疗再狭窄的有效方法。     

黄芪抑制血管平滑肌细胞增殖及其作用机制

目的 观察黄芪(AS)对血管平滑肌细胞(VSMC)增殖的抑制作用,了解黄芪是否通过刺激VSMC产生一氧化氮(nitric oxide,NO),使细胞周期停滞于G0／G1期,从而抑制平滑肌细胞增殖。方法 [3H]-胸腺嘧啶核苷酸([3H]-TdR)掺入测定VSMCDNA合成,流式细胞仪检测细胞周期情况,硝酸还原酶法测定细胞培养上清中NO水平。结果 黄芪以剂量依赖关系抑制血清诱导的VSMC[3H]-胸腺嘧啶核苷酸掺入,使G0／G1期细胞比例明显增多,S期细胞比例显著减少,黄芪刺激VSMC后,细胞培养上清中NO水平呈剂量依赖上升。结论黄芪能抑制VSMC增殖,使细胞周期停滞于G0／G1期,这一过程可能与黄芪刺激VSMC产生NO有关。     

丝裂素活化的蛋白激酶反义寡核苷酸抑制表皮生长因子诱导体外 …

目的：探讨丝裂素活化的蛋白激酶（ＮＡＰＫ）反义寡核苷（ＯＤＮ）对表皮生长因子（ＥＧＦ）诱导的培养大鼠血管平滑肌细胞增生的抑制作用。方法：用脂质体将Ｐ４２－和Ｐ４４－ＭＡＰＫ ＯＤＮ０．２μｍｏｌˉＬ＾－１转染入大鼠血管平滑肌细胞，设正义及随机ＯＤＮ为对照，用Ｗｅｓｔｅｒｎ Ｂｌｏｔ法结合Ｐ－８１滤纸法以髓磷脂碱性蛋白为底物测定ＭＡＰＫ活性。［＾３Ｈ］胸腺嘧啶核苷酸掺入测定平滑肌细胞ＤＮＡ合成。结果     

硫酸多糖抗血管平滑肌细胞增殖作用机理的研究进展

血管平滑肌细胞 (vascular smooth mus-cle cell,VSMC)存在于血管壁中膜 ,是决定血管活性和血管构型的重要因素。根据结构与功能的不同 ,VSMC分为收缩型和合成型两种表型 (phenotype)。收缩型 VSMC呈分化状态 ,不能增殖 ;合成型的 VSMC是去分化的细胞 ,具有很强的增殖能力。近年来的研究表明 ,在各种刺激因素和生长因子的作用下 ,VSMC可由分化状态转变为去分化状态 ,并从中膜迁移内膜 ,在内膜中大量增殖 ,使血管壁增厚 ,顺应性下降 ,管腔狭窄 ,是高血压、动脉粥样硬化和血管再狭窄等疾病的主要原因 [1 ] 。硫酸多糖是含硫酸基、多聚…     

亚硝基乙酰青霉胺抑制人血管平滑肌细胞增殖的实验研究

目的探讨亚硝基乙酰青霉胺对人血管平滑肌细胞(VSMC)增殖的抑制作用。方法将不同浓度的亚硝基乙酰青霉胺300、500、800、1000μmol/L作用于体外培养的血管平滑肌细胞(VSMC),采用氚-胸腺嘧啶核苷(3H-TdR)掺入的方法检测细胞的增殖。结果在500、800、1000μmol/L的亚硝基乙酰青霉胺作用下,VSMC的3H-TdR掺入量cpm分别为1096.33±85.60、852.00±57.80、693.00±49.60,均与对照组的1270.00±96.50有显著性差异(P<0.01),并表现为剂量依赖性(P<0.01)。结论亚硝基乙酰青霉胺能够抑制人VSMC的增殖,可能有防治经皮腔内冠状动脉成形术后再狭窄的作用。     

重组TGFα—PE40对血管平滑肌细胞增殖的抑制作用

AIM: To study inhibitory effect of recombinant transforming growth factor alpha-Pseudomonas exotoxin fusion protein (TP40) on proliferation of the cultured vascular smooth muscle cells (SMC). METHODS: Expression of epidermal growth factor receptor (EGFR) mRNA and EGFR in cultured proliferating and quiescent SMC was analyzed with Northern blot and immunohistochemistry. Inhibitory effects of TP40 on SMC proliferation and protein synthesis were analyzed with crystal violet staining and [3H]leucine incorporation. Competition assays were performed by the addition of 100-fold excess of EGF. RESULTS: Expression of EGFR mRNA and EGFR in rapidly proliferating SMC increased than that in quiescent SMC. When the concentration of TP40 was 10 or 100 micrograms.L-1, inhibitory effects of TP40 on rapidly proliferating SMC proliferation and protein synthesis were much higher than that on quiescent SMC (P < 0.01), and the IC50 of [3H]leucine incorporation against rapidly proliferating and quiescent SMC were 8.01 (5.05-12.69) and 121.95 (90.98-163.47) micrograms.L-1. Excess EGF completely blocked inhibitory effects of TP40. CONCLUSION: The rapidly proliferating SMC express EGFR at a high level. TP40 selectively inhibited the proliferation of rapidly proliferating SMC. The cytotoxic effects of TP40 were specifically mediated by EGFR.     

中药抑制血管平滑肌细胞增殖的新途径-mTOR

血管平滑肌细胞异常增殖是动脉粥样硬化等多种疾病的病理基础。哺乳类雷帕霉素靶蛋白（mTOR）可被PKB磷酸化后激活．作用于下游信号分子，具有调控细胞的存活、增殖和凋亡等重要功能。雷帕霉素能特异性地与mTOR结合，抑制下游底物活化．阻止下游底物的活化．阻止细胞周期进程。某些中药的有效成分可作用于PI3K—mTOR通路，抑制血管平滑肌细胞增殖。     

叶酸抑制同型半胱氨酸诱导大鼠血管平滑肌细胞增殖的研究

目的探讨叶酸抑制同型半胱氨酸致大鼠血管平滑肌细胞增殖的研究。方法培养大鼠胸主动脉血管平滑肌细胞(VSMC),流式细胞仪检测VSMC周期,[³H]TdR参入测定VSMC的DNA合成。结果同型半胱氨酸以剂量依赖关系使VSMC周期中的G₀/G₁期细胞比例明显减少,S期细胞比例显著增多,增加VSMC的[³H]TdR参入。叶酸可明显抑制同型半胱氨酸诱导的作用。结论同型半胱氨酸能诱导VSMC增殖,叶酸能抑制同型半胱氨酸诱导的VSMC增殖。     

Antisense oligodeoxynucleotides downregulated c sis mRNA expression to inhibit proliferation of vascular smooth muscle cells 1

目的：研究ｃｓｉｓ反义寡脱氧核苷酸（ＯＤＮ）对ｃｓｉｓ表达及血管平滑肌细胞（ＶＳＭＣ）增殖抑制效应．方法：用合成ｃｓｉｓ正、反义ＯＤＮ培养ＶＳＭＣ;用液闪测定［３Ｈ］ＴｄＲ掺入并细胞计数,观察细胞增殖;用逆转录ＰＣＲ,评价ｃｓｉｓ表达．结果：ｃｓｉｓ反义ＯＤＮ２,４,６,８,１０μｍｏｌ·Ｌ－１抑制ＶＳＭＣ（１０３％±０７％,２２６％±０９％,３１０％±１１％,３５４％±０９％,４３３％±１２％）和降低［３Ｈ］ＴｄＲ掺入（６８％±０３％,９７％±０７％,２９０％±０６％,３２０％±０７％,５０６％±１３％）呈有剂量依赖性．反义ＯＤＮ１０μｍｏｌ·Ｌ－１培养细胞４ｄ,最大抑制率达６０３％±１０％,［３Ｈ］ＴｄＲ掺入降低５６３％±０９％,ｃｓｉｓｍＲＮＡ表达明显降低;而正义ｃｓｉｓＯＤＮ对ＶＳＭＣ无抑制,细胞数和［３Ｈ］ＴｄＲ掺入及ｃｓｉｓｍＲＮＡ水平与对照无差异．结论：ｃｓｉｓ反义ＯＤＮ明显下调ｃｓｉｓｍＲＮＡ表达,显著抑制ＶＳＭＣ增殖     

RAR gamma agonists inhibit proliferation of vascular smooth muscle cells

The multifactorial and unpredictable nature of human restenosis will probably necessitate interventional strategies that target multiple processes involved in neointimal proliferation. Retinoids represent a growing class of pleiotropic biologic response modifiers with demonstrable efficacy in managing several pathologic conditions pertaining to neointimal proliferation. However, retinoid treatment is associated with a high incidence of adverse effects. The action of all-trans-retinoic acid is mediated by two families of nuclear receptors, RARs and RXRs, each containing three isoforms alpha, beta, and gamma. Because synthetic retinoids that are receptor and function specific have been shown to differ from each other by several orders of magnitude in their potencies and are associated with limited adverse effects, we examined the effect of synthetic retinoids on serum- and serotonin-induced vascular smooth muscle cell (VSMC) proliferation. Naturally occurring retinoids were used as controls. All-trans-retinoic acid at nanomolar concentrations inhibited smooth muscle cell proliferation. In this study, we report that RAR gamma subgroup-specific agonists are the most potent inhibitors of serum and serotonin VSMC proliferation, as compared with other RAR pan-agonists and naturally occurring retinoids tested. Our results indicate that RAR gamma subgroup-specific agonists should be assessed further in in vivo models of neointimal proliferation.     

葛根素对血管平滑肌细胞增殖及对c-fos蛋白和凝血酶受体mRNA表达的影响

目的:通过建立凝血酶(T)诱导的血管平滑肌细胞(VSMC)增殖模型,观察葛根素对T诱导的VSMC增殖的影响,并进一步观察其对c- fos蛋白以及凝血酶受体(TR)mRNA表达的作用,旨在认识葛根素作用的分子机制。方法:以细胞计数法和流式细胞仪测定DNA含量,细胞周期分析观察T及葛根素对VSMC增殖和DNA合成的影响。T及葛根素等各处理因素作用2 4h后,免疫印迹法(Westernblot)检测c -fos蛋白表达,半定量逆转录聚合酶链式反应(RT- PCR)检测TRmRNA的表达。结果:T对VSMC有明显促增殖作用,促增殖效应在2 4h末达到峰值,且T浓度在0 .1～1.0U·L- 1有剂量依赖关系;葛根素呈剂量依赖性地抑制T诱导的细胞增殖、DNA合成以及VSMCc fos蛋白的表达;高浓度(1.5×10 - 3mol·L- 1)的葛根素可显著抑制T诱导的TRmRNA上调。结论:葛根素能抑制T诱导的VSMC增殖,这可能与其抑制c- fos蛋白有关,并部分与其抑制TRmRNA表达有关。     

Ligustilide inhibits vascular smooth muscle cells proliferation

Proliferation and migration of vascular smooth muscle cells (VSMCs) are believed to develop atherosclerosis and venous bypass graft disease. Ligustilide is widely used to treat some pathological settings such as atherosclerosis and hypertension. The aim of this study was to examine the effect of ligustilide on VSMCs proliferation. The results show that ligustilide significantly inhibited VSMCs proliferation and cell cycle progression. Further analysis shows that ligustilide suppressed reactive oxygen species production and extracellular signal-related kinases (ERK), c-Jun N-terminal protein kinase (JNK), and p38 MAP kinase. Cells were treated with antioxidant, superoxide dismutase, catalase, and DPI, respectively, leading to repress ERK, JNK, and p38 activation. The inhibitors of mitogen activated protein kinase (MAPK), PD98059, SB203580, and Sp600125, inhibited cell proliferation. These findings suggest the antiproliferative effect of ligustilide was associated with the decrement of reactive oxygen species resulting in the suppression of MAPK pathway. Thus, ligustilide contribute to be the effective agent in preventing cardiovascular diseases.     

L-carnitine and taurine synergistically inhibit the proliferation and osteoblastic differentiation of vascular smooth muscle cells

Aim:

To investigate the synergistic action of L-carnitine (LC) and taurine (TAU) on the proliferation and osteoblastic differentiation of vascular smooth muscle cells (VSMCs).

Methods:

DNA and protein synthesis of VSMCs were assessed using scintillation counting. Alkaline phosphatase (ALP) activity and calcium content were determined to investigate the effects of LC and TAU on the osteoblastic differentiation and mineralization of VSMCs. TAU uptake by VSMCs was assayed. RNA interference was used to down-regulate the expression of the TAU transporter (TAUT) in rat VSMCs.

Results:

LC and TAU synergistically inhibited the proliferation and β-glycerophosphate (β-GP)-induced osteoblastic differentiation of VSMCs as evidenced by the decreased [³H]thymidine incorporation, ALP activity and calcium deposition. Furthermore, LC stimulated the TAU uptake and TAUT expression in VSMCs. Suppression of TAUT with short hairpin RNA (shRNA) abolished the synergistic action of LC and TAU in VSMCs.

Conclusion:

The synergistic inhibitory action of LC and TAU on the proliferation and osteoblastic differentiation of VSMCs is attributable to the up-regulation of TAUT expression and TAU uptake by LC.     

栉孔扇贝裙边糖胺聚糖对血管平滑肌增殖及TNFαmRNA表达的影响

目的观察栉孔扇贝裙边糖胺聚糖(SS-GAG)对体外培养的血管平滑肌细胞(VSMC)增殖作用及对肿瘤坏死因子(TNF)mRNA表达的影响,并探讨SS-GAG对抗动脉粥样硬化(AS)的可能机制。方法建立碱性成纤维细胞生长因子(bFGF)诱导的平滑肌细胞增殖模型,分别用MTT法和原位杂交方法观察SS-GAG对血管平滑肌增殖活性及对(bFGF)诱导增殖的VSMC内(TNF)mRNA表达的影响。结果不同浓度的SS-GAG组细胞增殖活性明显低于模型组细胞,差别有统计学意义(P<0.05,P<0.01);低、高剂量SS-GAG组TNFmRNA基因表达明显低于模型组(P<0.01),表达强度和阳性细胞数量均减少。结论SS-GAG对VSMC增殖和由bFGF诱导增殖的VSMC内TNFmRNA表达均有抑制作用,且随着SS-GAG浓度的升高抑制作用增强。     

甘草次酸对血管平滑肌细胞c-fos mRNA表达及细胞增殖的影响

目的　研究甘草次酸 (GA)对大鼠血管平滑肌细胞(VSMC)原癌基因c fosmRNA表达及细胞增殖的影响 ,探讨GA与血管紧张素Ⅱ (AⅡ )受体结合的可能机制。方法　原代培养大鼠血管平滑肌细胞 ,[3H]TdR参入DNA、MTT分析法、Northernblot。结果　①低浓度GA( 1× 10 -9mol·L-1)及高浓度GA( 1× 10 -5mol·L-1)均能导致c fosmRNA迅速表达 ;1× 10 -5mol·L-1Sar AⅡ能够阻断AⅡ、GA诱导的VSMCc fos表达 ;低浓度和高浓度GA都能促进AⅡ ( 1× 10 -5mol·L-1)诱导的VSMCc fos表达 ;②低浓度GA对细胞的增殖有促进作用 ;随着浓度的升高 ,促增殖作用减弱 ;高浓度GA抑制细胞的增殖。Sar AⅡ单独作用于VSMC ,不影响细胞增殖 ;Sar AⅡ能够阻断AⅡ对细胞增殖的促进作用 ;Sar AⅡ既抑制低浓度GA促细胞增殖作用 ,也消除高浓度GA抑制细胞增殖作用 ;低浓度GA与AⅡ联合作用 ,对细胞增殖的促进作用更加显著 ;高浓度GA与AⅡ联合作用于VSMC ,则可减轻高浓度GA对细胞增殖的抑制作用。结论　GA能激活c fos转录因子 ,从而产生对VSMC的增殖作用 ,因此 ,GA具有AT1受体的激动剂2 0 0 2 0 4 0 3收稿 ,2 0 0 2 0 7 2 3修回作者简介 :张凤云 ,女 ,33岁 ,硕士 ;贺师鹏 ,男 ,67岁 ,教授。研究方向 :酶和受体的拮抗剂样作用     

CCDPK反义寡核苷酸抑制bFGF诱导的大鼠血管平滑肌细胞增殖(英文)

AIM: To investigate the role of Ca(2+)-calmodulin dependent protein kinase (CCDPK) on basic fibroblast growth factor (bFGF)-induced vascular smooth muscle cell (VSMC) proliferation and the inhibitory effect of antisense CCDPK oligonucleotides (ODN). METHODS: Before being exposed to bFGF, cultured rat VSMC CCDPK activity was inhibited by pretreatment with either a phosphorothioate-protected 17-mer antisense CCDPK ODN-directed against the initiation of translation sites of the p42 and p44 CCDPK isoform or with CCDPK kinase inhibitor PD98059. All ODN were introduced into cells by liposomal transfection. DNA synthesis was measured by [3H]thymidine incorporation. P44- and p42-CCDPK protein expression and phosphorylation were measured by Western blot. RESULTS: PD98059 inhibited bFGF-induced phosphorylation of CCDPK and DNA synthesis. Antisense CCDPK ODN 0.2-0.8 mumol.L-1 reduced both p44- and p42-CCDPK expression and phosphorylation of CCDPK in a concentration-dependent manner and DNA synthesis induced by bFGF. Lipofectin alone or sense and random CCDPK ODN did not affect p44- and p42-CCDPK protein expression or bFGF-induced phosphorylation of CCDPK or DNA synthesis. CONCLUSION: bFGF-stimulated rat VSMC proliferation is mediated by CCDPK. The antisense CCDPK ODN can inhibit bFGF-induced VSMC proliferation through down-regulating p44- and p42-CCDPK level.     

低分子肝素纳米粒子抑制兔血管平滑肌细胞增殖

目的 探讨低分子肝素(LMWH)纳米粒子抑制血管平滑肌细胞(VSMC)增殖的作用及可能的作用机制.方法 建立32只兔颈内静脉-颈动脉移植模型,并随机分为生理盐水灌注组(A)、LMWH灌注组(B)、生理盐水灌注+术后皮下注射LMWH组(C)、LMWH纳米粒子灌注组(D),每组8只.术后4周末截取移植静脉,行免疫组化检测增殖细胞核抗原(PCNA)蛋白的表达;并行RT-PCR检测移植血管单核细胞趋化蛋白-1(MCP-1)、碱性成纤维细胞生长因子(bFGF)、血小板源性牛长因子(PDGF)基因mRNA的表达.结果 与A、B、C三组相比,D组的PCNA阳性细胞指数明显降低(P<0.05),其MCP-1、bFGF、PDGF基因mRNA的表达水平也低于另外三组(P<0.05).结论 LMWH纳米粒子通过抑制平滑肌细胞的增殖与迁移而抑制了血管移植后内膜增生.其作用机制可能是通过降低MCP-1、bFGF、PDGF基因mRNA的表达而实现的.