三七总皂苷对大鼠血管平滑肌细胞增殖模型细胞周期相关蛋白表达的影响

目的研究三七总皂苷(TPNS)对大鼠血管平滑肌细胞(VSMC)增殖细胞周期相关蛋白表达的影响。方法以血小板衍生生长因子-BB(PDGF-BB)诱导大鼠VSMC,观察含药血浆对VSMC增殖的影响,以免疫荧光流式细胞术测定增殖细胞核抗原(PCNA)及细胞周期相关蛋白的表达。结果血小板衍生生长因子(PDGF)剌激VSMC后,VSMC PCNA、VSMC细胞周期蛋白D1(cyclinD1)、细胞周期蛋白依赖性激酶4(CDK4)蛋白表达增强,细胞周期抑制因子P21蛋白表达下调。阿托伐他汀含药血浆和TPNS含药血浆均可抑制PDGF诱导的VSMC PCNA、cyclinD1和CDK4蛋白表达增强及P21蛋白表达下调。TPNS与阿托伐他汀比较差异无统计学意义(P>0.05)。结论 PDGF剌激VSMC后,可促进细胞周期转化,细胞增殖加快。阿托伐他汀、TPNS可抑制PDGF诱导的VSMC增殖,其作用可能是通过抑制了细胞周期相关调节蛋白的表达,从而抑制了VSMC细胞周期转化和增殖。     

脱氢表雄酮对大鼠血管平滑肌细胞增殖的影响

目的探讨脱氢表雄酮对大鼠血管平滑肌细胞活性及细胞周期的影响。方法培养大鼠胸大动脉血管平滑肌细胞系,血小板源性生长因子(PDGF)刺激细胞增殖,采用CCK-8方法观察不同浓度脱氢表雄酮对血管平滑肌细胞活性的影响,用流式细胞分析法检测细胞周期分布。结果1.0、2.5、5.0μg/LPDGF增强大鼠血管平滑肌细胞活性,0.1、1.0、10、100nM脱氢表雄酮抑制细胞活性,两者的作用随浓度增加而增强;脱氢表雄酮可抑制PDGF的作用。脱氢表雄酮的作用增加G1期的细胞数量。结论脱氢表雄酮通过抑制细胞周期的进展,而减少血管平滑肌细胞的增殖。     

血管舒缓素对PDGF诱导的大鼠血管平滑肌细胞增殖的影响

目的 探讨了血管舒缓素对血小板趋化生长因子（ＰＤＧＦ）诱导培养的大鼠胸主动脉平滑肌细胞增殖的影响。方法 取ＳＤ大鼠胸主动脉平滑肌细胞进行培养,传至５代后,分组观察ＰＤＧＦ、ＰＤＧＦ＋血管舒缓素组、ＰＤＧＦ＋血管舒缓素＋缓激肽受体拮抗剂组等。干预因素作用于血管平滑肌细胞（ＶＳＭＣ）,对＾３Ｈ－胸腺嘧啶（＾３Ｈ－ＴｄＲ）的掺入及原癌基因ｃ－ｍｙｃ ｍＲＮＡ的表达的影响。结果 １．ＰＤＧＦ可促进ＶＳＭＣ     

维生素E抑制同型半胱氨酸介导的血管平滑肌细胞增殖

目的 探讨在同型半胱氨酸诱导的血管平滑肌细胞(VSMC)增殖中,活性氧(ROS)的作用和维生素E的影响.方法 [3H]-胸腺嘧啶脱氧核苷掺人法测定细胞DNA合成率,锥虫蓝染色计数细胞数量,DCF-DA荧光探针测定细胞内ROS.结果 (1)同型半胱氨酸诱导VSMC的DNA合成增加,促进细胞增殖和ROS水平升高;尽管半胱氨酸诱导VSMC内ROS水平升高,但是对细胞DNA合成和增殖无影响.(2)过氧化氢酶抑制同型半胱氨酸介导的VSMC内ROS升高,而对VSMC增殖无影响.(3)α-生育酚、β-生育酚均可抑制同型半胱氨酸诱导VSNC内ROS水平升高,但是只有α-生育酚显著抑制VSMC增殖.结论 ROS升高不是同型半胱氨酸诱导的VSMC增殖的原因之一.维生素E降低同型半胱氨酸诱导的VSMC增殖可能与抑制蛋白激酶C活性有关,而与它的抗氧化性无关.     

p27基因对血管平滑肌细胞中连接蛋白43表达的影响

目的 研究连接蛋白43(Cx43)在p27基因抑制血管平滑肌细胞(VSMC)增殖中的作用.方法 以携带大鼠p27基因表达序列的复制缺陷型5型腺病毒载体(AdCMV-p27)转染VSMC后,应用免疫细胞化学染色检测p27和Cx43表达的变化;应用3H标记的胸腺嘧啶核苷(3H-TdR)掺入试验观察p27基因表达增强对VSMC增殖的影响.结果 (1)Ad-CMV-p27转染前,血小板衍化生长因子BB(platelet.derived growth factor,PDGF-BB)下调P27蛋白的表达,AdCMV-p27转染后,无论有无PDGF-BB刺激,VSMC中P27蛋白的表达均比转染前显著增高.(2)AdCMV-p27转染使VSMC中Cx43蛋白的表达基本恢复至有丝分裂原刺激前状态.(3)AdCMV-p27转染使VSMC的.H.TdR掺入量均较未转染组显著降低.结论 p27基因对Cx43表达的调控,使细胞间连接通讯得到维护,是其抑制VSMC增殖的重要机制之一.     

缓激肽对PDGF诱导的肾小球系膜细胞增殖的影响

[目的]探讨缓激肽（bradykinin,BK）对血小板源生长因子（PDGF）诱导的系膜细胞增殖的影响及与ERK信号途径相关性。[方法]BK预孵系膜细胞,采用PDGF-BB刺激系膜细胞,应用MTT法测细胞增殖,ELISA法测Ⅳ型胶原,应用Western法检测ERK蛋白表达,并应用BK受体特异性阻断剂HOE-140进一步研究BK对ERK通路的作用。[结果]（1）BK抑制PDGF所致的系膜细胞增殖,与单用PDGF-BB组比较差异有非常显著性意义（P〈0.05）。（2）BK抑制PDGF-BB所致系膜细胞Ⅳ型胶原分泌,与单用PDGF-BB组比较差异有显著性意义（P〈0.05）。（3）BK抑制PDGF-BB所致的系膜细胞ERK1/2磷酸化表达,与单用PDGF-BB组比较差异有显著性意义（P〈0.01）,HOE-140能阻断BK对于PDGF-BB/ERK1/2途径磷酸化的抑制作用。[结论]BK抑制PDGF诱导的系膜细胞增殖及细胞外基质分泌,该作用可能是通过抑制PDGF诱导的ERK1/2途径激活实现。     

缓激肽对血小板源性生长因子诱导的大鼠血管平滑肌细胞增殖中一氧化氮及其合酶基因表达的影响祆

目的 探讨缓激肽在对血小板源性生长因子（ＰＤＧＦ）诱导的培养的大鼠胸主动脉血管平滑肌细胞（ＶＳＭＣｓ）增殖的影响中一氧化氮（ＮＯ）含量与诱导型一氧化氮合酶（ｉＮＯＳ）ｍＲＮＡ表达的变化。方法 取ＳＤ大鼠胸主动脉平没肌细胞进行培养,传至４～６代,分成以下几组：１．对照组;２．ＰＤＧＦ组（５０ｎｇ／ｍｌ）;３．ＰＤＧＦ＋缓激肽（１０＾－４ｍｏｌ／Ｌ组;４．ＰＤＧＦ＋缓激肽＋Ｈｏｅ１４０（１０＾－４ｍｏ     

补阳还五汤及其有效组分和三七总皂苷含药血浆抗血小板衍生生长因子诱导的血管平滑肌细胞增殖的作用

目的：研究补阳还五汤及其有效组分和三七总皂苷（total Panax notoginseng saponins,TSPN）含药血浆对血小板衍生生长因子（platelet-derived growth factor,PDGF）诱导的血管平滑肌细胞（vascular smooth muscle cell,VSMC）增殖的影响。 方法：采用血浆药理学方法及PDGF-BB诱导VSMC增殖模型。以甲基噻唑基四唑（methyl thiazolyl tetrazolium,MTT）法检测空白血浆对VSMC生长的影响和含药血浆对PDGF-BB诱导的VSMC增殖的半数抑制浓度,确定补阳还五汤及其有效组分和三七总皂苷用药浓度。MTT法和流式细胞术检测补阳还五汤及有效组分和TSPN、阿托伐他汀对VSMC增殖活性及细胞周期的影响。 结果：PDGF-BB剌激后,VSMC增殖活性显著增强,G0/G1期细胞数减少,G2/M期和S期细胞数增多。与PDGF-BB剌激组比较,补阳还五汤、有效组分生物碱和苷、TSPN、阿托伐他汀等含药血浆均可抑制PDGF-BB诱导的VSMC增殖,增加G0/G1期细胞数,减少G2/M期和S期细胞数。 结论：补阳还五汤及其有效组分和TSPN均可抑制PDGF-BB诱导的VSMC增殖。生物碱和苷可能为补阳还五汤中抗VSMC增殖的主要药效物质,补阳还五汤及其有效组分生物碱和苷具有与阿托伐他汀、TSPN相似的抗VSMC增殖的作用。     

沉默人趋化因子受体1基因对小鼠血管平滑肌细胞增殖的作用

目的利用慢病毒构建人趋化因子受体1(chemokine receptor-like 1,CMKLR1)基因缺陷性小鼠血管平滑肌细胞株,观察沉默CMKLR1基因后血管平滑肌细胞的增殖情况。方法将正常血管平滑肌细胞、CMKLR1基因干扰对照血管平滑肌细胞株、CMKLR1基因缺陷性血管平滑肌细胞株分成正常组、增殖组、对照组和CMKLR1沉默组,增殖组、对照组、CMKLR1沉默组加入血小板源性生长因子-BB促进增殖,采用细胞计数和细胞增殖实验(Brdu法)检测血管平滑肌细胞增殖。结果增殖组血管平滑肌细胞的细胞数目和Brd U A值显著高于正常组(P均<0.05);与正常组相比,CMKLR1沉默组的血管平滑肌细胞数目和Brd U A值显著降低(P均<0.05);与此同时,对照组与正常组之间的血管平滑肌细胞增殖情况差异无统计学意义(P>0.05)。结论沉默CMKLR1受体可以抑制小鼠血管平滑肌细胞的增殖。     

PP60c-Src在血管紧张素Ⅱ对大鼠血管平滑肌细胞信息转导中的作用

目的：通过观察c—Src在AngⅡ对大鼠血管平滑肌细胞(VSMC)丝裂原活化的蛋白激酶(MAPK)活性和c—fos蛋白表达的影响，以进一步了解AngⅡ促VSMC增殖的细胞内信息转导机制。方法：原代和传代培养SD大民主动脉VSMC，以脂质体包裹反义c—Src寡脱氧核夺酸(Oligodeoxynucleotides ODNs)转染培养的VSMC以抑制c—Src蛋白表达和激酶活性。以未转染的VSMC为对照，观察10^7mol/L AngⅡ刺激对转染的VSMC的MAPK活性和c—fos蛋白表达的影响。蛋白免疫沉淀和酶自身磷酸化率测定c—Src激酶活性；髓鞘碱性蛋白(MBP)底物磷酸化率测定MAPK放酶活性；Western blot免疫印迹法测定c—Src和c—fos蛋白表达情况。始果：转染不同浓度反义c—Src()DNs的VSMCc—Src蛋白含量至浓度依赖性降低，0.2μmol/L、0.5μmol/L、1．0μmol／L和2．0μmol/L分别为对照的68．2％、34．7％、30。3％和15．8％，经方差分析具有显著性意义(P＜0.01)。c—Src激酶活性也显著抑制；以AngⅡ刺激经转染反义c—Src DNs的VSMC，c—Src激酶活性增幅仅为对照组的8．7％；MAPK活性仅为对照的1．6％；c—fos蛋白表达的增幅为对照组的30．0％。结论：AngⅡ可诱导VSMC c—Src激活和细胞内信息转导，且AngⅡ引起的MAPK和c—fos的激活依赖于c—Src的激活，提示c—Src是AngⅡ促血管平滑细胞增殖的重要信息分于。     

丝裂素活化蛋白激酶磷酸酶-1对血管平滑肌细胞增殖的影响及其机制

目的 研究丝裂素活化蛋白激酶磷酸酶-1(MKP1)对血管平滑肌细胞增殖的影响及机制。方法 转染MKP1质粒72h后，收集培养的血管平滑肌细胞(VSMC)，利用P^42／P^44磷酸化抗MAPK抗体通过免疫印迹法测定MAPK活性，用流试细胞仪测定细胞周期、细胞周期素和P27蛋白的表达。结果 转染MKP1质粒后，MAPK活性明显下降，VSMC阻滞于G0-G1期，同时抑制了细胞周期素D、E的表达，P27蛋白表达却明显增加。结论 MKP1抑制VSMC增殖可能是通过降低MAPK活性，抑制细胞周期素表达和增加P27蛋白表达途径实现的。     

血管紧张素Ⅱ诱导血管平滑肌细胞肥厚过程中MAPK对细胞周期素依赖性激酶抑制因子的调节作用

OBJECTIVE: To investigate the role of mitogen-activated protein kinase (MAPK) in the regulation of cyclin-dependent kinase inhibitors (CDKI) in the process of vascular smooth muscle cell (VSMC) hypertrophy induced by angiotensin II stimulation. METHODS: The medial layer of male SD rat aorta was isolated for VSMC culture. After cultured in serum-free medium to arrest the cell growth, VSMCs were stimulated with angiotensin II (1x10(-6) mol/L) or/and phorbol myristate acetate (PMA, 20 nmol/L), with the cells cultured in serum-free medium serving as control. MAPK activity of the cells was assayed 90 min after stimulation with immunoprecipitation test, and the expression levels of CDKI p27, p57 and p21 were determined by Western blotting 6 and 24 h after stimulation respectively. RESULTS: Compared with the control level, MAPK activity of the VSMCs was up-regulated by 238% by treatment with angiotensin II alone which, however, did not inhibit p27 expression or induce VSMC proliferation. Costimulation with angiotensin II and PMA slightly inhibited p27 expression but VSMC proliferation was still not observed. CONCLUSION: MAPK pathway is an important channel for extracellular proliferative and hypertrophic signal transduction into the nucleus of VSMCs.     

粘着斑激酶和丝裂原活化蛋白激酶对纤粘连蛋白诱导平滑肌细胞迁移和增殖的影响

目的　研究粘着斑激酶和丝裂原活化蛋白激酶在细胞外基质成分诱导血管平滑肌细胞迁移和增殖中的作用。方法　通过纤粘连蛋白 (FN)诱导培养的平滑肌细胞迁移和增殖 ,以免疫沉淀和Western印迹法检测粘着斑激酶 (FAK)和丝裂原活化蛋白激酶 (p4 2 / 4 4MAPK)及其磷酸化的表达量。将FAK反义寡核苷酸 (ODN)经脂质体转染细胞 ,观察其对FAK和p4 2 / 4 4MAPK磷酸化、细胞迁移以及增殖的影响。结果　不同浓度FN(5、10、2 0、4 0、6 0 μg/ml)在有效诱导平滑肌细胞迁移和增殖时FAK和p4 2 / 4 4MAPK也呈明显表达 ,2 0 μg/mlFN可使其磷酸化处于较高的表达量。脂质体可有效地介导ODN转染 ,转染效率为 86 7%± 4 5 %。转染后FAK以及p4 2 / 4 4MAPK磷酸化表达量明显减少 ,10、2 0、4 0和 6 0 μg/mlFN组迁移细胞数也分别显著减少 (2 3 2 6 %、2 1 6 3%、19 31%、17 88% ,P <0 0 5 ) ,5～ 6 0 μg/ml不同浓度的FN组 ,细胞增殖减少 2 7 6 7%～ 4 6 6 7% (P <0 0 5 )。 结论　活化的FAK和p4 2 / 4 4MAPK是细胞外基质诱导平滑肌细胞迁移和增殖的重要信号分子 ,二者之间存在着密切的联系 ,由其介导的信号转导促进了这一过程 ,反义FAKODN可有效地对此进行抑制     

BrdU-ELISA法测定四逆汤及组方药提取物对大鼠血管平滑肌细胞增殖的影响

目的 观察四逆汤(SNT)及组方药提取物对大鼠主动脉血管平滑肌细胞(VSMC)增殖的影响。方法 采用MTT比色法和Brdu—ELISA法观察药物对离体大鼠VSMC增殖的影响。结果 BrdU—ELISA法结果表明四逆汤总提取物(EST)对VSMC的BrdU掺入DNA没有显著影响，而MTT测定表明：EST可以提高VSMC的脱氢酶活性。甘草(LE)、附子(AE)、干姜(GE)、甘草加附子(LAE)、干姜加附子(AGE)提取物显著提高VSMC的脱氢酶活性，同时提高VSMC的BrdU掺入DNA的水平。结论 EST可以增加VSMC的脱氢酶活性，但对VSMC的BrdU掺入DNA的水平无影响。而其他组方药提取物可以增加VSMC的脱氢酶活性，同时提高VSMC的BrdU掺入DNA的水平。     

Fasudil inhibits platelet-derived growth factor-induced human pulmonary artery smooth muscle cell proliferation by up-regulation of p27kip1 via the ERK signal pathway

Background  RhoA/ Rho kinase (ROCK) pathway is involved in pulmonary arterial hypertension (PAH) and pulmonary artery smooth muscle cell (PASMC) proliferation. Inhibition of ROCK has been proposed as a treatment for PAH. But the mechanism of RhoA/ROCK pathway and its downstream signaling in proliferation of human PASMCs is unclear. We investigated the effect of fasudil, a selective ROCK inhibitor, on platelet-derived growth factor (PDGF) induced human PASMC proliferation, and the possible association between RhoA/ROCK and extracellular signal-regulated kinase (ERK), p27^Kip1.

Methods  Human PASMCs were cultured with the stimulation of 10 ng/ml PDGF, and different concentrations of fasudil were added before the addition of mitogen. Cell viability and cell cycle were determined with MTT and flow cytometry respectively. ROCK activity, ERK activity and protein expression of proliferating cell nuclear angigen (PCNA) and p27^Kip1 were measured by immunoblotting.

Results  By MTT assay, PDGF significantly increased the OD value that represented human PASMC proliferation, and pretreatment with fasudil significantly reversed this effect in a dose-dependent manner. After PDGF stimulation, the percentage of cells in S phase increased dramatically from 15.6% to 24.3%, while the percentage in G₀/G₁ phase was reduced from 80.6% to 59%. And pretreatment with fasudil reversed the cell cycle effect of PDGF significantly in a dose-dependent manner. PDGF markedly induced ROCK activity and ERK activity with a peak at 15 minutes, which were significantly inhibited by fasudil. In addition, fasudil significantly inhibited PDGF-induced PCNA expression and fasudil also upregulated p27^Kip1 expression in human PASMCs, which decreased after PDGF stimulation.

Conclusion  RhoA/ROCK is vital for PDFG-induced human PASMC proliferation, and fasudil effectively inhibited PDGF-induced human PASMC proliferation by up-regulation of p27^Kip1, which may be associated with inhibition of ERK activity.

     

大黄蛰虫丸血清活性成分对血小板源生长因子介导血管平滑肌增殖的作用及其机制

Objective: To investigate and compare the effects and mechanisms of three functional parts of Dahuang Zhechong Pill (DHZCP), including drugs with the function of removing blood stasis and promoting blood circulation (FP-Ⅰ), drugs with the function of expelling heat and moistening dryness (FP-Ⅱ), and drugs with the function of nourishing yin and replenishing blood (FP-Ⅲ) of DHZCP, on platelet-derived growth factor (PDGF)-stimulated vascular smooth muscle cells (VSMCs) proliferation with the method of serum pharmacology. Methods: VSMCs proliferation of rat was assayed by measuring the cell viability with the 3-(4, 5-dimethylthiazol-2yl)-2, 5-diphenyltetrazolium bromide (MTT) method. DNA synthesis in VSMCs was examined by detecting 5''-bromo-2''-deoxyuridine incorporation with the immunocytochemical method. Cycle of VSMCs was evaluated with flow cytometry. Expression of cyclin D1, p27, PKCα, and phosphorylated extracellular signal regulated kinase 1/2 (ERK1/2) was quantified by the Western blotting method. Results: The FP-Ⅰ and FP-Ⅲ containing serum was capable of inhibiting PDGF-stimulated proliferation and DNA synthesis of VSMCs, arrested VSMCs in G1 phase, downregulated cyclin D1, and upregulated p27 expression (P<0.01 or P<0.05). The FP-Ⅰ and FP-Ⅲ containing serum also inhibited the PDGF-induced phosphorylation of tyrosine of ERK1/2 and PKCα expression (P<0.01 or P<0.05). Conclusions: FP-Ⅰ and FP-Ⅲ of DHZCP are able to inhibit VSMCs proliferation via interrupting PKCα-ERK1/2 signaling, modulating the expression of cell cycle proteins to result in arresting the cells in G1 phase. The inhibitory effect is mainly related to the function of removing blood stasis and promoting blood circulation, slightly to the function of nourishing yin and replenishing blood, but not to the function of expelling heat and moistening dryness.     

阿托伐他汀对血管平滑肌细胞增殖和血红素氧化酶1表达的影响

目的探讨阿托伐他汀对血管平滑肌细胞增殖的影响及对血红素氧化酶1（HO-1）表达的作用。方法采用酶消化法分离大鼠血管平滑肌细胞。取4－6代细胞用于实验,胰岛素样生长因子1（IGF-1）刺激血管平滑肌细胞增殖,以不同浓度（0、0.01、0.1、1和10μmol/L）阿托伐他汀、10μmol/L阿托伐他汀＋锌原卟啉Ⅸ（ZNPPⅨ）进行干预。采用四唑盐（MTT）比色法观察细胞的增殖。逆转录聚合酶链反应（RT-PCR）半定量分析细胞HO-1 mRNA的表达。结果IGF-1可促进血管平滑肌细胞增殖,与空白组比较,IGF-1组细胞计数明显增加（P〈0.01）,随着阿托伐他汀浓度的提高,血管平滑肌细胞计数逐渐减少（P〈0.01）,加入ZNPPⅨ后血管平滑肌细胞增殖恢复。空白组和IGF-1组血管平滑肌细胞HO-1有少量表达,随着阿托伐他汀浓度的增加,HO-1的表达增强,呈剂量依赖性。与空白组和IGF-1组比较,0.01μmol/L组HO-1增加不明显,0.1μmol/L组HO-1开始有较明显增加,10μmol/L组HO-1表达达高峰（P〈0.01）。结论阿托伐他汀可抑制血管平滑肌细胞的增殖和诱导HO-1的表达。诱导HO-1表达是阿托伐他汀抑制血管平滑肌细胞增殖的机制之一。     

INHIBITORY EFFECT OF ANGIOTENSIN Ⅱ TYPE 1 RECEPTOR-ASSOCIATED PROTEIN ON VASCULAR SMOOTH MUSCLE CELL GROWTH AND NEOINTIMAL FORMATION

Objective To investigate the mechanism of a novel angiotensin Ⅱ type 1 receptor-associated protein （ATRAP） interfering with angiotensin Ⅱ type 1 （AT1） receptor-mediated vascular smooth muscle cell （VSMC） growth and neointimal formation. Methods VSMCs isolated from thoracic aorta of adult Sprague-Dawley （SD） rats were used in this study. ATRAP cDNA was subcloned into pcDNA3 vector and then transfected into VSMCs. DNA synthesis and extracellular signal-regulated kinase （ERK） and phospho-ERK expressions in VSMCs were assayed by measurement of ^3H thymidine incorporation and Western blotting, respectively. Morphological changes were observed in the balloon injured artery with or without transfection of ATRAP cDNA using 12-week-old male SD rats. Results ATRAP overexpression in VSMCs inhibited angiotensin Ⅱ （Ang Ⅱ）-induced ^3H thymidine incorporation 48 hours after Ang Ⅱ stimulation （ P 〈 0. 05 ）. In VSMC, Ang Ⅱ stimulation increased the phosphorylation of ERK, which reached the peak around 60 minutes. The activation of phospho-ERK was significantly decreased by ATRAP （ P 〈 0. 05 ）. Neointimal formation was markedly inhibited by ATRAP overexpression in injuried arteries. Conclusions The AT1 receptor-derived activation of ERK plays an essential role in Ang Ⅱ-induced VSMC growth. The growth inhibitory effects of ATRAP might be due to interfering with AT1 receptor-mediated activation of ERK in VSMC growth and neointimal formation.     

腺病毒介导血管紧张素Ⅱ2型受体基因转染表达抑制血管平滑肌细胞增殖

目的：探讨血管平滑肌细胞（VSMC）转染表达血管紧张素II（AngII)2型受体（AT2R）对其增殖的影响。方法：构建带AT2R基因的重组复制缺陷型腺病毒载体（AdCMV-AT2R)体外转染大鼠主动脉VSMC,用RT－PCR方法检测AT2R mRNA表达,流式细胞仪检测AT2R表达率,用细胞周期,分裂指数,MTT比色法和5－溴尿苷（BrdU)掺入法检测VSMC增殖。结果 构建的AdCMV-AT2R体外转染培养VSMC表达率为89．51％,AT2R峰值表达时,其S期和G2－M期细胞比率从31．7％降低到13．9％（P＜0．05）,分裂指数从37．4％降低互9．6％（P＜0．01）,MTTK有光度和BrdU掺入量分别降低61．4％和51．6％（P＜0．01）,结论：AT2RL志染表达可显著抑制体外培养VSMC的增殖,这一作用对再狭窄防治是有益的。     

罗格列酮对高糖诱导的血管平滑肌细胞增殖的影响

目的研究罗格列酮对高糖诱导的大鼠血管平滑肌细胞（VSMC）生长的影响，从而探讨其对糖尿病血管并发症的作用及机制。方法利用组织贴块法体外培养SD大鼠主动脉血管平滑肌细胞并分组给药，采用MTT比色法检测细胞生长活性；用Western blotting检测细胞增殖核抗原的表达；以流式细胞仪检测细胞周期的进程；RT—PCR检测MMP-2mRNA的水平。结果罗格列酮呈浓度依赖性抑制高糖诱导的大鼠VSMC的增殖；降低PCNA的表达（P〈0．05），明显降低细胞的S期数目百分比（P〈0．01），增加G0／G1期数目百分比（P〈0．01）；明显降低MMP-2mRNA（P〈0．01）的表达。结论从细胞分子水平说明罗格列酮可能通过降低PCNA的表达，阻止细胞进入S期，减少有丝分裂来发挥对高糖诱导的VSMC增殖的抑制作用，MMP-2在罗格列酮改善血管重构的过程中可能发挥了重要的作用。