D-硫酸多糖抗血管平滑肌细胞增殖作用及其机制

目的：探讨硫酸多糖（DPS）抗增殖作用及其机制,方法;用MTT法评价DPS抗大鼠主动脉平滑肌细胞（VSMC）增殖作用,用流式细胞仪观察DPS对VSMC胞浆内游离Ca^2 的含量、细胞周期和蛋白质含量的影响。结果：DPS在0.001-100mg/L浓度下,对AngⅡ诱导的VSMC增殖均有明显抑制作用,最佳抑制浓度为1mg/L,流式细胞术分析结果表明,DPS在抗增殖的浓度（1mg/L）下能抑制VSMC从G0/G1到S期的转换,阻止VSMC进入G2/M期;减少VSMC蛋白质的合成、DPS能明显抑制胞浆内游离Ca^2 浓度的升高,此作用可被一氧化氮合酶抑制剂（L-NAME）所阻断,提示一氧化氮可能介导了DPS降低胞浆内游离Ca^2 浓度的作用。结论：硫酸多糖DPS可拮抗AngⅡ诱导的VSMC增殖,其作用机理可能与降低胸浆内游离Ca^2 浓度,抑制VSMC的DNA及蛋白质合成有关。     

萘哌地尔抑制大鼠血管平滑肌细胞增殖作用机制研究

目的：研究萘哌地尔对大鼠血管平滑肌细胞增殖的抑制作用,并对作用机制进行探讨。方法培养大鼠血管平滑肌细胞,并用去甲肾上腺素诱导其进行增殖,用细胞计数法检测和比色法研究萘哌地尔对大鼠血管平滑肌细胞增殖的影响;用应荧光法测定细胞内的钙浓度,用实时PCR对相关基因的表达进行检测。结果培养的大鼠胸主动脉平滑肌细胞,经鉴定阳性数量达到96%,符合实验标准。各组细胞数差异无统计学意义,且加药前后细胞的形态没有明显变化;与对照组比较,去甲肾上腺素（ NE ）能明显诱导细胞的增殖,吸光度（ OD ）值为（0.55±0.016）,显著高于对照组的（0.42±0.020）,差异有统计学意义（ P〈0.05）;萘哌地尔可抑制细胞的增殖,OD值为（0.30±0.19）,与对照组比较,差异有统计学意义（ P〈0.05）;与对照组比较,NE能显著促进细胞中c-myc和c-fosmRNA的表达,分别为（132.5±8.9）与（670.5±9.6）,显著高于对照组的（81.2±2.6）与（22.8±1.6）,差异有统计学意义（ P〈0.05）;对HRG-1 mRNE的表达具有显著抑制作用;萘哌地尔对NE诱导的c-fosmRNA和c-myc过度表达和HRG-1 mRNA表达的降低具有明显的抑制作用;钙离子浓度与基因表达研究结果一致。结论萘哌地尔可明显的抑制大鼠血管平滑肌细胞增殖,其作用机制可能为降低细胞内血钙浓度,调节相关基因的表达。     

Urocortin抑制大鼠血管平滑肌细胞增殖活力的机制研究

目的：探讨Urocortin抑制大鼠血管平滑肌细胞增殖活力的机制。方法：分离和培养大鼠血管平滑肌细胞，并加入不同浓度的Urocortin以及其他药物培养，运用肌’法考察Urocortin对血管平滑肌细胞增殖活力的抑制作用及相关机制。结果：Urocottin能够浓度依赖性地降低大鼠血管平滑肌细胞增殖活力，且能显著抑制L-型钙通道激动剂Bay K8644对细胞活力的增强作用。结论：Urocottin可能通过阻断厶型钙通道而浓度依赖性地抑制血管平滑肌细胞的增殖活力。     

ox—LDL诱导血管平滑肌细胞增殖和凋亡的分子机制

血管平滑肌细胞增殖是动脉粥样硬化(atherosclerosisAs)形成和血管再狭窄的重要特征之一。而氧化型低密度脂蛋白(OxidizdeLowdensitylipoproteinox-LDL)是致动脉粥样硬化的一个独立危险因素。随着细胞分子生物学的发展,发现ox-LDL可通过细胞因子介导引起血管平滑肌细胞增殖或凋亡。现综述ox -LDL与细胞因子的关系,进一步探讨细胞因子在动脉粥样硬化形成过程中的作用。1ox -LDLoss诱导趋化因子、细胞因子的表达ox-LDL致动脉粥样硬化的作用与细胞因子、趋化因子和钻附因子的产生有关。Ross认为[1],动脉粥样硬化斑块是一种损伤性炎症反…     

NO介导黄芩苷抑制血管平滑肌细胞增殖的作用

目的探讨黄芩苷(Ba)对高糖高胰岛素模拟胰岛素抵抗(IR)状态下人胸主动脉平滑肌细胞(HASMCs)增殖的影响及其与NO的关系。方法组织贴块法培养HASMCs,以高糖高胰岛素培养基模拟胰岛素抵抗。分别设对照组、L-NAME组、不同剂量的Ba组和不同剂量Ba合用L-NAME组。MTT法测定细胞增殖;硝酸还原酶法测定NO含量;NOS试剂盒测定T-NOS活性。结果高糖高胰岛素促进HASMCs的增殖。10-5mol·L-1Ba促进正常培养细胞的增殖,而10-4mol·L-1Ba明显抑制细胞的增殖;高、低剂量的Ba均可抑制模拟IR培养的HASMCs增殖,且高剂量Ba作用更强。HASMCs经模拟IR培养,其培养液中NO含量和总NOS活性均下降,高、低剂量Ba能够增加NO含量、增强总NOS活性,而加用L-NAME可减弱该作用。结论 Ba抑制正常及IR培养的HASMCs增殖,可能与调节NOS活性及NO含量有关。     

氨氯地平抑制人血管平滑肌细胞增殖机制的研究

目的　观察氨氯地平对人血管平滑肌细胞（VSMC）丝裂素活化蛋白激酶（MAPK）活性的影响。方法　取人乳腺下动脉培养VSMC,用bFGF刺激细胞增殖,观察氨氯地平对bFGF激活的MAPK活性的影响,用p42/p44磷酸化抗体蛋白免疫印迹法测定MAPK活性。 结果　bFGF对MAPK有显著激活作用,激活峰值出现在5～15 min,维持至3 h; 此活化作用被MAPK激酶的特异抑制剂PD98059抑制; 无论瞬时或持久的bFGF激活的MAPK活性均被氨氯地平抑制。 结论　氨氯地平通过MAPK信号转导途径抑制bFGF所致的细胞增殖。     

血管平滑肌细胞增殖的相关机制研究进展

血管平滑肌细胞( VSMC)的增殖对冠心病的发生、发展以及冠状动脉内再狭窄的形成具有重要意义.本文就VSMC增殖的病理作用、信号转导通路VSMC以及增殖的相关调控机制等方面的进展作一综述,以进一步认识VSMC增殖在冠状动脉粥样硬化及经皮冠状动脉腔内成形术(PTCA)后再狭窄的发生机制,从而为冠心病的防治提供新的思路.     

血管平滑肌细胞的增殖机制

血管平滑肌细胞 (ＶＳＭＣ)增殖是高血压、动脉粥样硬化和血管成形术后再狭窄等疾病中重要的病理改变[1 ] 。目前认为其发生机制与ＶＳＭＣ增殖的正负调控因子平衡失调密切相关[2 ] 。本文从ＶＳＭＣ增殖调控的角度对近年来ＶＳＭＣ增殖机制研究新的进展作一综述。1　细胞外调控ＶＳＭＣ增殖过程中 ,一些特定的细胞以旁分泌作用或靶细胞以自分泌作用产生ＶＳＭＣ生长及分化的调节物。分子生物学研究已揭示许多细胞外的生长因子、血管活性物质与增殖有关 ,以血小板源生长因子 (ＰＤＧＦ)、成纤维细胞生长因子 (ＦＧＦ)、转化生长因子 β(ＴＧ…     

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。     

银杏内酯对血管紧张Ⅱ依赖性血管平滑肌细胞增殖的作用

目的 观察血管紧张Ⅱ（AngⅡ）对培养牛主动脉血管平滑肌细胞（VSMC）增殖的作用及银杏内酯对其增殖的影响。方法 采用组织块贴壁法培养牛主动脉VSMC,以^3H-TdR掺入法和流式细胞仪分别测定VSMC的DNA合成量及细胞周期中各期细胞构成比。结果 （AngⅡ）（0.1μmol/L)作用24h使用^3H-TdR掺入量比对照组增加34%;S期和G2/M期细胞增多,细胞增殖指数由35.15%增至45.03%。与（AngⅡ）组相比,AngⅡ加银杏内酯B（G-B,0.1-10μmol/L)组、AngⅡ加G-B和银杏内酯A（G-A）的混合物（G-AB,0.1-10μmol/L)组的^3H-TdR掺入量减少;S期细胞构成比和细胞增殖指数减少。结论 AngⅡ对VSMC有促增殖作用,要被G-B和G-AB所拮抗。     

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.     

Astrapterocarpan isolated from Astragalus membranaceus inhibits proliferation of vascular smooth muscle cells

The inhibitory effects of astrapterocarpan, formononetin, and calycosin isolated from Astragalus membraneceus on platelet-derived growth factor (PDGF)-BB-induced proliferative response in rat vascular smooth muscle cells (A10 cells) were investigated. Astrapterocarpan significantly inhibited PDGF-BB-induced cell proliferation and DNA synthesis in a concentration-dependent manner. This inhibition was not attributed to toxicity. In contrast, formononetin and calycosin had no effect. We next examined the effect of astrapterocarpan on PDGF-BB signal transduction. Astrapterocarpan inhibited PDGF-BB-induced phosphorylation of extracellular signal-regulated kinase 1/2 (ERIC1/2) mitogen-activated protein (MAP) kinase. However, this compound had no effect on phosphorylation of PDGF-beta-receptor, Akt kinase and p38 MAP kinase. These results indicated that astrapterocarpan inhibits PDGF-BB-induced vascular smooth muscle cell proliferation and that this effect may be mediated, at least in part, by inhibition of the ERK1/2 MAP kinase cascade.     

金粉蕨素抑制大鼠主动脉平滑肌增殖作用及机制

目的 :观察金粉蕨素对牛血清刺激的大鼠主动脉平滑肌细胞增殖的抑制作用 ,并对其作用机制进行初步探讨。方法 :体外培养大鼠主动脉平滑肌细胞 ,以终浓度为 10 %的新生牛血清 (NCS)作为刺激因素 ,用噻唑蓝 (MTT)比色法和细胞计数法观察细胞增殖状况 ,用流式细胞仪分析细胞周期 ,用Westernblot实验测定蛋白表达。结果 :与 10 %牛血清组相比 ,不同浓度金粉蕨素组的MTT测定值与细胞数目均明显下降 (P <0 .0 5 ) ,其下降幅度呈浓度依赖性 ;10 μmol·L-1时达峰值 (P <0 .0 1) ;细胞周期分析显示 ,金粉蕨素组G1期百分比 (85 .1% )高于10 %牛血清组 (70 .0 % ) ,而S期比例 (4 .3% )低于10 %牛血清组 (16.4 % ) ;Westernblot结果显示给药组P ERK1 2蛋白表达明显低于同时间点牛血清组。结论 :金粉蕨素能阻止细胞周期由G0 G1期向S期推进 ,抑制血管平滑肌细胞增殖 ,此作用与其抑制ERK1 2磷酸化、影响MAPK ERK通路激活有关。     

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.     

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.     

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     

牛磺酸对大鼠血管平滑肌细胞增殖的影响

观察了牛磺酸对自发性高血压大鼠（ＳＨＲ）和Ｗｉｓｔａｒ－Ｋｙｏｔｏ大鼠（ＷＫＹ）动脉血管平滑肌细胞（ＶＳＭＣ）增殖的影响．结果显示牛磺酸（１．０ｍｍｏｌＬ－１）虽然抑制ＷＫＹ的ＶＳＭＣ的增殖，对ＳＨＲ的ＶＳＭＣ的生长却无影响，同时发现牛磺酸（１０ｍｍｏｌＬ－１）也不能减低小牛血清所致的ＳＨＲ的ＶＳＭＣ内肌醇磷脂量的异常增加．提示牛磺酸虽然可以通过抑制ＷＫＹ的ＶＳＭＣ增殖进而在防治某些血管性病变中发挥作用，但是对于ＳＨＲ这一遗传性高血压大鼠，牛磺酸既不能抑制ＶＳＭＣ的异常增殖也未能阻止肌醇磷脂量的增加．     

龙胆苦苷对大鼠血管平滑肌细胞增殖、迁移的影响

目的 观察龙胆苦苷对血管平滑肌细胞（vascular smooth muscle cells,VSMC）增殖、迁移能力的影响,并探讨其可能的作用机制。方法 体外分离培养大鼠血管平滑肌细胞,将血管平滑肌细胞随机分为分为control组、GPS处理组、PF-3758309+GPS组。采用噻唑蓝(MTT)法观察各组细胞增殖能力,计算细胞增殖抑制率;采用细胞划痕实验观察各组细胞迁移能力,计算细胞迁移率。采用Western blotting法检测各组细胞Pak4及MMP-2表达情况。结果 与对照组相比,龙胆苦苷处理组细胞增殖率及迁移率明显降低（P<0.01）,GPS组细胞内Pak4、MMP-2 表达水平明显降低（P<0.01）;而与GPS组相比,PF-3758309+GPS组可明显增加细胞增殖率及迁移率（P<0.05）,血管平滑肌细胞内 MMP-2 表达水平明显上调（P<0.05）。 结论 龙胆苦苷具有抑制血管平滑肌细胞增殖及迁移,其机制可能与抑制Pak4相关。     

缬沙坦对球囊损伤后血管平滑肌细胞增生的影响

目的 探讨缬沙坦因子防治人类血管成形术后再狭窄的可行性方法观察新的非肽类血管紧张素Ⅱ的Ⅰ型(AT_1)受体拮抗剂,缬沙坦(Valsartan),对血管平滑肌细胞(VSMC)增生的影响。对大鼠髂动脉球囊内皮剥脱术后过度增生模型采用~3H-TdR和~3H-Leu掺入,免疫组化染色检测VSMC中增殖细胞核抗原(PCNA)的表达及图象分析血管壁形态学变化。结果 缬沙坦显著减少~3H-TdR和~3H-Leu的掺入量,减少新生内膜面积和PCNA阳性细胞数。结论 缬沙坦能抑制大鼠动脉的球褒内皮损伤后的VSMC增生,可能它是防治血管成形术再狭窄的有效药物。