Effects of Total Flavonoids ofHippophae RhamnoidesL.on Intracellular Free Calciumin Cultured Vascular Smooth Muscle Cells of Spontaneously Hypertensive Rats and Wistar-Kyoto Rats

To explore the effects of total flavonoids of Hippophae rhamnoides L. （TFH） quercetin （Que） and isorhamnetin （Isor） on the intracellular free calcium （[Ca^2＋]） in vascular smooth muscle cells （VSMC） of spontaneously hypertensive rats （SHR） and Wistar-Kyoto rats （WKY）. Metheds： Fluo 3-acetoxymethylester（Fluo-3/AM） was used to observe the effects of TFH （100mg/L） and its essential monomers, namely Que （10^-4mol/L） and Isor （10^-4mol/L） on changes of [Ca^2＋]1 in cultured SHR and WKY VSMC （abbr. to Ca-SHR ＆ Ca-WKY） following exposure to high K^＋, norepinephrine （NE） and angiotensin Ⅱ （AngⅡ）, and to compare with the effects of verapamil （Ver）. Results： （1） TFH, Que and Isor had inhibitory effects on resting Ca-SHR （P〈0.05）, but had no significant effects on Ca-WKY （P〉0.05）. （2） High K^＋ could increase Ca-SHR more significantly than Ca-WKY （P〈0.05）; TFH, Que and Isor could inhibit the elevation of [Ca^2＋]1 induced by high K^＋ -depolarization, with the effects similar to that of Ver, and the effect on Ca-SHR was more significant than that on Ca-WKY （P〈0.05）. （3） NE and Ang Ⅱ could increase Ca-SHR more significantly than Ca-WKY （P〈0.05）, TFH, Que and Isor had remarkably inhibitory effect on the elevation of Ca-SHR and Ca-WKY induced by NE or Ang Ⅱ. （4） In the absence of extracellular Ca^2＋ , TFH, Que and Isor also had certain inhibitory effect on Ca-SHR and Ca-WKY induced by NE, and the effect on the former was more significant than that on the latter（P〈0.05）. Ceaclusiea： TFH, Que and Isor might decrease the levels of [Ca^2＋], in VSMCs by blocking both voltage-dependent calcium channels （VDC） and receptoroperated calcium channels （ROC） in physiological or pathological state, which may be one of the important mechanisms of their hypotensive and protective effects on target organs in patients with hypertension.

Lamin A/C Modulate Apoptosis of Rat Vascular Smooth Muscle Cells During Cyclic Stretch Application

Objective The apoptosis of vascular smooth muscle cells(VSMCs)influenced by abnormal cyclic stretch is crucial for vascular remodeling during hypertension.We explored that the causes of mechano-responsive lamin A/C changingin aonormai cyclic stretcn and its roles in VSMC apoptosis.Methods and results Our previous vascular proteomics study revealed that LaminA/C is mechano-sensitive molecule.When VSMCs are subjected to cyclic stretch,the expression of LaminA/C is significantly changed which participates dysfunctions of VSMCs during hypertension.However,the molecular mechanism involved in regulation of LaminA/C expression and the role of LaminA/C in the VSMC apoptosis during cyclic stretch application are still unclear.In the present study,VSMCs were subjected to different amplitudes of cyclic steetch in vitro:5%cyclic stretch(physiological strain)or 15%cyclic stretch(pathological strain).The expression of 2 different selective cleavage isomers of LaminA/C,i.e.LaminA and LaminC,and the apoptosis of VSMCs were detected.The results showed that compared with 5%group,15%cyclic stretch significantly decreased the expression of LaminA and LaminC,and promoted the apoptosis of VSMCs.Using specific small interfering RNA(siRNA)transfection which targets on LMNA the encoding gene of LaminA/C,the expression of LaminA and LaminC in VSMCs was significantly decreased,and the apoptosis was significantly increased.In order to study the molecular mechanism involved in cyclic stretch regulating the expression of LaminA/C,we focused on the microRNA(miR).Bioinformatics analysis showed that the 3’untranslated region(3’UTR)of LMNA has two potential binding sites to miR-124-3p.Double luciferase reported system revealed that both sites have binding abilities to miR-124-3p.Under static condition,miR-124-3p inhibitor significantly up-regulated the expression levels of LaminA and LaminC,while the miR-124-3p mimics significantly down-regulated them.RT-PCR results showed that 15%cyclic stretch significantly up-regulated the expression of miR-124-3p compared with 5%cyclic stretch.Furthermore,in order to study the role of changeed LaminA/C in VSMC apoptosis,LMNA-specific siRNA was transfected to repress the expression of LaminA/C in VSMCs,and Protein/DNA microarray was used to detecte the activity of transcription factors.The transcription factors whose activity were changed significantly(increase or decrease more than 2 times)were analyzed by cluster analysis and ingenurity pathway analysis(IPA).Six transcription factors associated with apoptosis were screened,in which TP53 was activated by the specific siRNA transfection and the other 5 were inavtived,including TP53,CREB1,MYC,STAT1/5/6 and JUN.Using abdominal aorta coarctation hypertensive model,the change of miR-124-3p in VSMCs was explored in vivo.A marked increase of miR-124-3p in thoracic aorta was revealed compared with the sham-operated controls,and in situ FISH revealed that this increase was mainly in the VSMCs.Conclusions The present study suggest that abnormally increased cyclic stretch(15%)up-regulates the expression of miR-124-3p in VSMCs,which subsequently targets on the 3’UTR of LMNA and decreases the expression of nuclear envelope protein LaminA/C;the repressed LaminA/C may play an important role in the apoptosis of VSMCs by regulating the activity of virious transcription factors,such as TP53,CREB1,MYC,STAT1/5/6 and JUN.The present study may provide a new insight into understanding the molecular mechanisms of vascular remodeling.

Expression of Inositol 1,4,5-trisphosphate Receptor mRNA in Myocardium of Spontaneous Hypertension Rats and Cultured Vascular Smooth Muscle Cells of Rats

Objective\ To investigate expression of inositol 1,4,5 trisphosphate receptor (IP\-3R) mRNA on sacroplasmic reticular in myocardium of spontaneous hypertension rats (SHRs) and cultured vascular smooth muscle cells (VSMC) of rats and effects of perindopril and urapidil on them. Methods\ SHRs were orally given perindopril (1.0 mg·kg\+\{ 1\}·d\+\{ 1\}) or urapidil (15 mg·kg\+\{ 1\}·d\+\{ 1\}) for 24 weeks, respectively. Expression of IP\-3R mRNA was examined by semi quantitative reverse transcription polymers chain reaction (RT PCR) using three oligonuclotide primers for each subtype of IP\-3R with β actin as internal label. Results\ All subtypes of IP\-3R were expressed in myocardium of SHR, WKY and cultured VSMC. Expression of IP\-3R mRNA in left ventricle of SHR was markedly enhanced. Urapidil could down regulate expression of IP\-3R Ⅰand IP\-3R Ⅲ, perindopril slightly increased expression of IP\-3R Ⅱ and decreased expression of IP\-3R Ⅰand IP\-3R Ⅲ in myocardium of SHR. Conclusion\ Our results suggest that expression of IP\-3R mRNA in cardiovascular system could be regulated by urapidil and perindopril.

Effects of estradiol on cell cycle and cyclin proteins of vascular smooth muscle cells in rats

To study the effects of 17β-estradiol(E2) on the growth of cultured rat vascular smooth muscle cells (VSMC).Methods The cell cycle and the expressions of Cyclin D1 and CDK4 proteins were examined by flow cytometry in VSMC cultured in different concentrations (0～100 nmol/L) of 17β-estradiol with or without serum.Results Under serum-stimulating conditions,17β-estradiol(1,10,100 nmol/L) promoted VSMC proliferation by accelerating their cell cycle progression from G1 to S phases,and the cell rates at S were (31.89±9.14)%(35.90±4.59)% and (30.77±1.20)% respectively,significantly higher than the corresponding values of control cells (21.63±1.80)%.This was accompanied by the significantly increased expression of Cyclin D1 and CDK4 proteins.In the cultures without serum,however,high concentrations (10,100 nmol/L) of E2 induced a cell cycle arrest at G1 phase,which was characterizsed by decreased cell rates at S phase [(9.93±1.43)% and (8.76±1.80)% respectively,P<0.05] as compared with the corresponding control values and a down-regulation of expressions of Cyclin D1 and CDK4 proteins.Conclusion E2 can either promote or inhibit VSMC proliferation depending upon the presence or absence of serum mitogens.The underlying mechanism may be associated with the hormone’s action on the expression of Cyclin D1 and CDK4 which act as the G1 phase regulators.4 refs.

Iododeoxyuridine uptake in proliferating smooth musc le cells:an in vitro model to assess drug effects on intimal hyperplasia

Purpose To assess the maximum uptake of Iododeo xyur idine (IUdR) by proliferating smooth muscle cells in vitro to determine the opti mal concentration to be administrated in an in vivo experiment. The long-term g oal is to utilize radioactive IUdR to inhibit smooth muscle cell proliferation a nd restenosis of arteries after balloon angioplasty in vivo. Methods Porcine smooth muscle cells (SMCs) were cultured in 5% FBS medium and stim ulated to proliferate by the addition of medium containing 10% FBS and insulin. IUdR was added at 5 μM, 10 μM, 20 μM, 30 μM, 40 μM, respectively, in prolif erating SMCs with control for 1, 3, 5, 7 day incubation. Fluorescence Activated Cell Scanning (FACS) was performed after the SMCs were harvested and double-sta ined with FITC-conjugated anti-IUdR antibody (B44) and propidium iodide (PI). The ratio of IUdR-labeled cells to total cell population for each IUdR concentr ation and duration was determined by FACS. All data were repeated three times at each time point. The doubling times, growth curve and cell density of the proli ferating SMCs were investigated using Beckman Coulter Particle Counter and digit al microscopy. Results The percentage of proliferating SMCs uptaking IUdR incr eased from 1 to 5 days incubation with all concentrations of IUdR; In day 5, the uptake rate reached the peak value, then decreased by 7 days. IUdR uptake on d ay 5 was higher with concentrations of 10 μM and 20 μM. The doubling times of the SMCs were prolonged with IUdR concentration increasing, while the proliferat ing cell number and density compared with control decreased obviously by day 5 ( P<0.05).Conclusion The peak time to uptake IUdR was 5 days and optimal concentration of IUdR was between10 μM to 20 μM for proliferating SMCs to upta ke in vitro. IUdR itself could inhibit the SMCs’ proliferation and the inhibito ry effect was related to the concentration.[

Activated focal adhesion kinase involved in adhesion and migration of vascular smooth muscle cells stimulated by fibronectin

OBJECTIVE: To study the effects of focal adhesion kinase (FAK) phosphorylation on smooth muscle cells (SMCs) adhesion and migration stimulated by fibronectin. METHODS: Adhesion and migration of cultured SMCs were stimulated by different concentrations of fibronectin (FN), FAK and its phosphorylation were detected by immunoprecipitation and Western blot. FAK antisense oligodeoxynucleotides (ODNs) were transfected into SMCs by cationic lipid to investigate its modulatory effects on tyrosine phosphorylation. SMCs adhesion and migration were also measured by morphological enumeration and modified Boyden Chambers, respectively. RESULTS: FAK were expressed when SMCs adhesion and migration were successfully simulated by different concentrations of FN. FAK phosphorylation were detected only at 20 microg/ml FN or more. FAK antisense ODNs were transfected efficiently by cationic lipid and FAK phosphorylation was inhibited substantially. The SMCs migration rate in the 5 - 60 microg/ml FN groups was reduced by 17.89% - 27.67%. Cell migration stimulated by FN at 10, 20, 40 and 60 microg/ml were reduced by 23.26%, 21.63%, 19.31% and 17.88%, respectively (P

Endothelin-1, an important mitogen of smooth muscle cells of spontaneously hypertensive rats

OBJECTIVE: To study the features of vascular smooth muscle cell (VSMC) proliferation induced by endothelin-1 (ET-1). METHODS: VSMCs of spontaneously hypertensive rats (SHR) and Wistar-Kyoto rats were cultured and treated with ET-1. Basic fibroblast growth factor (bFGF) gene expression was measured using both Northern blot and an enzyme-linked immunoassay. RESULTS: ET-1 resulted in an increase in bFGF transcripts at 8 - 24 h; bFGF levels were significantly higher in VSMCs treated with ET-1 than in those not treated. However, VSMCs growth responses in SHR and WKY were different. Smooth muscle cells of SHR were hyper-responsive to ET-1. Maximal bFGF mRNA levels were elevated 3.5-fold at 4 h of stimulation in WKY and 8-fold at 8h in SHR4. Moreover, the proliferation of VSMCs induced by ET-1 was inhibited by antisense phosphorothioate oligodeoxynucleotides (10 micromol/L AS-bFGF) but not sense bFGF oligomers at the same concentrations, being reduced by 80% in SHR and 40% in WKY vs control, respectively. Furthermore, the effect of AS-bFGF oligomers on SHR SMC proliferation is significantly greater than on WKY SMC proliferation. CONCLUSION: ET-1 may be required for exaggerated vascular growth responses in SHR and bFGF may be involved.

Proliferation of aortic smooth muscle cells and renin-angiotensin system in SHR rats

目的：探讨ＳＨＲ大鼠主动脉平滑肌细胞（ＡＳＭＣ）异常增殖和肾素血管紧张素系统（ＲＡＳ）的关系．方法：测定血管紧张素Ｉ（Ａｎｇ）、卡托普利（Ｃａｐ）、沙拉新（Ｓａｒ）对培养的ＳＨＲ、ＷＫＹＡＳＭＣ增殖和Ａｎｇ、血管紧张素转化酶（ＡＣＥ）的影响．结果：Ａｎｇ在２％血清培养基中可刺激ＳＨＲＡＳＭＣ增生．ＳＨＲＡＳＭＣ分裂增殖能力比ＷＫＹ强，ＳＨＲＡＳＭＣＲＡＳ处于高功能状态．Ｃａｐ长期（４周）干预显著抑制ＳＨＲＡＳＭＣ异常增殖和Ａｎｇ、ＡＣＥ活性，Ｓａｒ长期干预同样抑制ＳＨＲＡＳＭＣ的增殖和ＡＣＥ活性，但Ａｎｇ水平反而升高．Ｃａｐ短期（２４小时）干预不影响两种大鼠ＡＳＭＣＲＡＳ．结论：Ｃａｐ和Ｓａｒ长期干预通过减少ＳＨＲＡＳＭＣＡｎｇ生成或阻断Ａｎｇ和特异受体结合，抑制其异常增殖．

Inhibitory effect of antisense basic fibroblast growth factor oligonucleotides on proliferation of cultured aortic smooth muscle cells induced by angiotensin Ⅱ in SHR rats

目的：研究转染反义碱性成纤维细胞生长因子（ｂＦＧＦ）寡核苷酸（ＯＤＮ）对培养的自发性高血压大鼠（ＳＨＲ）主动脉平滑肌细胞（ＳＭＣ）生长的影响．方法：用脂质体介导法将反义ｂＦＧＦＯＤＮ转入ＳＭＣ内，用Ｎｏｒｔｈｅｒｎ杂交检测ｂＦＧＦ基因表达，并测定［３Ｈ］ｔｈｙｍｉｄｉｎｅ掺入和细胞计数．结果：转染反义ｂＦＧＦＯＤＮ（５μｍｏｌ·Ｌ－１）几乎完全抑制血管紧张素Ⅱ（ＡｎｇⅡ，１μｍｏｌ·Ｌ－１）诱导增高的ｂＦＧＦｍＲＮＡ表达和明显抑制ＳＭＣ增殖，在基础状态和ＡｎｇⅡ刺激条件下，［３Ｈ］ｔｈｙｍｉｄｉｎｅ掺入分别被抑制２６５％（Ｐ＜００１）和４２０％（Ｐ＜００１），细胞数分别被抑制１７３％（Ｐ＜００１）和２２２％（Ｐ＜００１）．结论：反义ｂＦＧＦＯＤＮ能有效抑制ＡｎｇⅡ诱导的ｂＦＧＦ基因表达和ＳＭＣ增殖．

枸橼酸镁对慢性肾衰竭环境下氧化应激的抑制作用

目的探讨枸橼酸镁(magnesium citrate,MgCit)抑制慢性肾衰竭(chronic renal failure,CRF)环境下氧化应激的作用。方法SD大鼠分为CRF模型组、MgCit组(375、750 mg/kg),另设正常对照组、MgCit对照组(750 mg/kg);透射电镜观察大鼠胸大动脉血管平滑肌细胞(vascular smooth muscle cells,VSMCs)中线粒体形态;利用试剂盒检测大鼠主动脉和血浆中超氧化物歧化酶(superoxide dismutase,SOD)和丙二醛(malonaldehyde,MDA)的含量。培养VSMCs并分为正常对照组、CRF模型组、MgCit组(1.5、3 mmol/L),流式细胞仪定量检测细胞超氧化物阴离子(dihydroethidium,DHE)和细胞凋亡情况。结果与对照组相比,模型组大鼠胸大动脉VSMCs线粒体肿胀,嵴断裂或消失;MgCit干预能减轻线粒体肿胀,未见嵴断裂;模型组大鼠主动脉和血浆SOD水平降低(P<0.05),MDA水平升高(P<0.05);MgCit干预能增加主动脉和血浆SOD水平,并降低MDA水平(P<0.05)。CRF环境下即CRF模型组VSMCs的DHE含量升高,凋亡增加(P<0.05);MgCit干预能降低DHE含量,并抑制凋亡(P<0.05)。结论MgCit抑制CRF大鼠和VSMCs的氧化应激水平。

Slfn1对大鼠平滑肌细胞增殖的影响及机制

目的探讨睡眠因子1(Slfn1)对大鼠血管平滑肌细胞(VSMCs)增殖的影响及机制。方法麻醉处死56只雄性SD大鼠,剪取腹主动脉到主动脉弓的血管段、分离中膜组织块体外培养4~5 d,采用免疫荧光法检测α-平滑肌肌动蛋白(α-SMA)的表达鉴定平滑肌细胞;感染复数(MOI)为1×10^(2)、1×10^(3)、1×10^(4)浓度Slfn1的重组腺病毒干扰质粒转染VSMCs 48 h,通过荧光显微镜及流式细胞仪检测不同MOI组VSMCs中有绿色荧光蛋白(eGFP)的细胞/总细胞的百分比,确定最佳MOI用于后续实验,并分为Slfn1干扰组(用Slfn1的重组腺病毒干扰质粒转染)、Slfn1干扰对照组(用Slfn1的重组腺病毒干扰空载体质粒转染)及空白对照组(用正常血清培养),采用聚合酶链式反应(PCR)检测3组Slfn1信使RNA(mRNA)的表达,CCK-8检测VSMCs增殖;提取RNA进行高通量RNA测序、并通过R语言分析,寻找差异基因,对差异基因进行基因本体(GO)和京都基因和基因组数据库(KEGG)富集分析。结果原代培养VSMCs第10~15天时,细胞呈典型的“峰谷”样生长形态,细胞免疫荧光法显示VSMCs胞质内有α-SMA表达,鉴定为VSMCs;Slfn1的重组腺病毒干扰质粒转染VSMCs 48 h后,1×10^(3)MOI组VSMCs中质粒的转染效率高(90%);PCR结果示Slfn1干扰组VSMCs中Slfn1 mRNA表达减少(P<0.05),CCK8结果显示Slfn1干扰组VSMCs增殖增加(P<0.05);用Slfn1重组腺病毒干扰质粒转染VSMCs 48 h,提取RNA进行高通量RNA测序及R语言分析结果显示,差异基因中上调基因94个,下调基因181个;GO和KEGG富集分析显示,Slfn1基因可能通过蛋白质糖基化、mRNA监测通路、鞘脂类信号通路等调控VSMCs的增殖。结论基因干扰VSMCs的Slfn1可促进VSMCs的增殖,其机制可能与蛋白质糖基化、mRNA监测通路及鞘脂类信号通路等调控有关。

Experimental Study of Hirudo and salvia miltiorrhiza on Smooth Muscle Cell Hyperplasia following Balloon Angioplasty

Objective: To find the prevention of restenosis after transluminal angioplasty (TA).Methods: Sixty rabbit iliac arteries of 30 rabbits were randomly divided into three groups: group A, B and C, 20 in each. After experimental atherosclerotic stenosis and TA performing, ordinary forage plus 2 g of Hirudo (Hirudo nipponica whitmania) powder was fed to group A every day, to the group B, 2 gSalvia miltiorrhiza (red sage root) powder was added and to the group C, ordinary forage only. Angiography and pathomorphological examination were carried out 30 days later.Results: (1) Hirudo significantly reduced the thickness of iliac intima as compared with the other two groups (P < 0.05), the thickness in the group A, B and C was 40.1 ± 9.8 μm, 48.2 ± 8. 2 μm and 69. 3 ± 9. 2 μm respectively. (2) The incidence of restenosis after TA in both group A (31.4%) and group B (48.4%)were significantly lower than that in the group C (62.8%,P < 0.05). The difference was also found between the group A and B(P < 0.05). (3) Ultrastructure examined by transmission electron microscopy showed that less rough endoplasmic reticulum and more myofilaments in well differentiated smooth muscle cell (SMC) of the arterial intima in the group A and B, while in the group C, more rough endoplasmic reticulum, more synthetic cells were seen in SMC.Conclusions: Hirudo andSalvia miltiorrhiza could effectively inhibit the hyperplasia of SMC in arterial intima and reduce intima thickness and the incidence of restenosis after TA significantly, thus it might play a role in the prevention of restenosis after TA. The effect of Hirudo is more potent than that ofSalvia miltiorrhiza.

水蛭素对高同型半胱氨酸大鼠血管平滑肌细胞的影响

目的:观察水蛭素对高同型半胱氨酸(Hcy)大鼠血管平滑肌细胞(VSMC)的作用机制。方法:50只SD大鼠,采用随机数字表法分为正常组、模型组和水蛭素3个不同剂量组(25、50、100 AT-U/mL),每组10只。正常组予以普通饲料喂养,模型组及水蛭素组大鼠予以普通饲料及DL-蛋氨酸灌胃,造模21周,测血脂4项、血清Hcy,水蛭素组皮下注射水蛭素,2周后测血脂和Hcy,取胸主动脉组织。采用苏木精-伊红(HE)染色和免疫组织化学染色观察胸主动脉组织病理变化及B细胞淋巴瘤-2(Bcl-2)、B细胞淋巴瘤-2相关X蛋白(Bax)和胱天蛋白酶3(Caspase3)表达;实时荧光定量(RT-qPCR)检测Bcl-2、Bax和Caspase3的mRNA表达。结果:水蛭素各剂量组三酰甘油(TG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)的含量显著降低(P<0.01),水蛭素高剂量组血清高密度脂蛋白胆固醇(HDL-C)的含量显著升高(P<0.01);水蛭素各剂量组主动脉内膜增厚、VSMC增生减轻;水蛭素高、中剂量组胸主动脉组织Caspase3、Bax蛋白表达增多,Bcl-2蛋白的表达减少,水蛭素各剂量组Caspase3、Bax的mRNA不同程度降低,Bcl-2的mRNA表达显著降低(P<0.01),水蛭素高剂量组对胸主动脉组织Caspase3、Bcl-2、Bax的mRNA的调控最佳。结论:水蛭素可能通过调节脂质、促进Hcy诱导下异常增殖的VSMC凋亡,延缓动脉粥样硬化进展,而且可以通过Caspase3/Bax/Bcl-2凋亡信号通路有效促进高Hcy诱导的异常增殖的VSMC凋亡,为动脉粥样硬化的早期防治提供了新方向。

水蛭和丹参对血管成形术后平滑肌细胞增殖影响的实验研究

目的 :探讨腔内血管成形术 (transluminalangioplasty ,TA)后再狭窄的预防方法。方法 :将 60支髂动脉 (3 0只家兔 )随机分为 3组 (每组 2 0支髂动脉 ) :水蛭组、丹参组和对照组 ,造成实验性动脉粥样硬化狭窄并进行TA后 ,水蛭组每天饲喂 2 g水蛭粉和普通饲料 ,丹参组每天饲喂 2 g丹参粉和普通饲料 ,对照组每天只饲喂普通饲料 ,3 0天后 ,进行血管造影和病理形态学检查。结果 :(1 )水蛭组髂动脉内膜厚度 (40 1± 9 8μm)显著小于丹参组 (48 2±8 2 μm)和对照组 (69 3± 9 2 μm) ,P <0 0 5。 (2 )TA后管腔狭窄度 ,水蛭组 (3 1 4% )和丹参组(48 4% )显著小于对照组 (62 8% ) ,P <0 0 5。 (3 )透射电镜观察表明 ,水蛭组和丹参组动脉内膜平滑肌细胞分化较好 ,细胞内粗面内质网较少 ,肌丝较多 ,而在对照组 ,平滑肌细胞内含有较多的粗面内质网 ,合成型平滑肌细胞较为多见。结论 :中药水蛭和丹参有抑制TA后血管平滑肌细胞增生 ,减轻内膜增厚 ,降低再狭窄发生率的作用 ,水蛭的效果更为显著。

腺病毒介导的rHSG-1基因转染对自发性高血压大鼠血管平滑肌细胞增殖的影响

目的 :应用腺病毒介导的转基因方式转染大鼠增殖抑制基因 (rHSG 1) ,以观察rHSG 1对自发性高血压大鼠 (SHR)主动脉血管平滑肌细胞 (VSMCs)增殖的影响。方法 :体外培养大鼠主动脉血管平滑肌细胞并转染含有rHSG 1基因的重组复制缺陷型腺病毒载体 (Ad5rHSG 1) ,采用细胞计数、MTT和3 H thymidine参入法 ,观察rHSG 1对细胞增殖的影响 ;采用流式细胞仪分析rHSG 1对细胞周期的影响 ;应用WesternBlot方法检测rHSG 1对细胞周期调控蛋白p2 7Kip1、p2 1Cip1和增殖细胞核抗原 (proliferatingcellnuclearangitin ,PCNA)的作用。结果 :Ad5rHSG 1转染培养的SHRVSMCs后 ,能明显抑制细胞增殖 ,与对照组相比抑制率为 4 0 % (P <0 .0 1) ;细胞周期阻滞于G0 /G1期 ,周期调控蛋白p2 7Kip1、p2 1Cip1表达升高 ,PCNA表达降低。结论 :rHSG 1基因过表达可以抑制培养的自发性高血压大鼠血管平滑肌细胞增殖 ,并可能是通过参与细胞周期调节发挥作用。

组织贴壁法培养大鼠主动脉平滑肌细胞的探讨

目的 :探讨分离、培养大鼠主动脉平滑肌细胞 (VSMC)的方法 ,为研究损伤性血管疾病提供有用的体外研究模型。方法 :用组织贴壁、反转干涸的方法分离、培养大鼠主动脉平滑肌细胞并进行传代培养。采用形态学和抗α-SM -actin免疫组织化学鉴定证实为SVMC。结果 :细胞呈VSMC特征性“峰”“谷”状生长 ,历次原代培养经鉴定均为高纯度的VSMC。经传代培养至 2 0代 ,细胞维持原有生长性状 ,细胞活力未见减低。结论 :组织贴壁法培养大鼠主动脉平滑肌细胞具有简便、易行、细胞损伤小、活力及纯度高的优点 ,是研究损伤性血管疾病良好的体外研究模型。

维拉帕米诱导血管平滑肌细胞凋亡及其在再狭窄机制中的作用

目的探讨维拉帕米能否诱导血管平滑肌细胞凋亡及细胞凋亡在再狭窄机制中的作用。方法分别取正常兔髂动脉，动脉粥样硬化及再狭窄髂动脉血管中膜组织进行平滑肌细胞培养，［３Ｈ］ＴｄＲ参入法测定细胞增殖活性，维拉帕米诱导平滑肌细胞凋亡，通过电镜观察，ＤＮＡ凝胶电泳及流式细胞仪了解各组平滑肌细胞凋亡情况。结果维拉帕米诱导下，平滑肌细胞的变化具有凋亡的典型特征。血管成形术后，细胞增殖及凋亡系统均被激活，再狭窄组细胞增殖程度增加２６％，细胞凋亡激活程度增加１９％，二者比例失衡。结论维拉帕米能够引起血管平滑肌细胞凋亡，而平滑肌细胞凋亡的相对减少在再狭窄的发生机制中发挥一定的作用。

大鼠胸主动脉平滑肌细胞的培养与鉴定

目的探讨以简便、高效的方法获取血管平滑肌细胞,为相关研究提供实验材料。方法采用组织贴块法进行原代培养,胰酶消化法传代,并应用相差显微镜和平滑肌肌动蛋白对细胞进行形态学和免疫组化鉴定。结果90%的组织块接种存活,培养5代的平滑肌细胞纯度达98%以上。镜下可见培养细胞呈典型的“峰-谷状”样生长,免疫组化染色显示胞浆内平滑肌肌动蛋白阳性表达。结论本法简便、可靠,短期内可获大量高纯度、功能良好的血管平滑肌细胞,可作为研究心血管疾病良好的体外模型。

糖尿病大鼠血管平滑肌细胞体外培养方法的探讨

目的:对糖尿病大鼠血管平滑肌细胞体外培养方法进行探讨,建立糖尿病大鼠血管平滑肌细胞模型,为糖尿病慢性血管并发症研究奠定基础。方法:建立糖尿病大鼠模型,用组织贴壁法体外培养胸主动脉血管平滑肌细胞。结果:糖尿病大鼠造模成功。用贴壁法培养糖尿病大鼠血管平滑肌细胞,3d后相差显微镜下可见细胞游出,培养7～10d左右细胞重叠生长达多层,高低起伏呈“峰—谷”状。平滑肌细胞actin免疫组织化学染色鉴定为平滑肌细胞。结论:糖尿病大鼠血管平滑肌细胞增殖速度快,培养条件要求严格,在形态学上与正常大鼠平滑肌细胞相同。