大鼠骨髓间充质干细胞条件培养液对心脏成纤维细胞胶原合成的影响

目的体外模拟机体缺血环境,研究骨髓间充质干细胞(MSCs)旁分泌对心脏成纤维细胞胶原合成的影响,为MSCs移植机制提供实验依据。方法分离培养SD大鼠的MSCs,换以无血清培养液同时缺氧处理不同时间,然后收集MSCs的条件培养液,以此条件培养液作为刺激因子孵育 SD大鼠的心脏成纤维细胞,用MTT和3H-脯氨酸掺入观察心脏成纤维细胞的增殖及胶原合成。结果用MSCs条件培养液培养心脏成纤维细胞,3H-脯氨酸掺入明显高于对照组,缺氧6 h组的3H-脯氨酸掺入高于对照组约100％,提示MSCs条件培养液刺激心脏成纤维细胞胶原合成增加;MTT结果无显著差异,提示:MSCs条件培养液没有影响心脏成纤维细胞的增殖。结论大鼠骨髓间充质干细胞的缺氧和无血清条件培养液能够通过旁分泌刺激心脏成纤维细胞自身合成胶原能力的增强,提示移植到缺血心肌缺血区的骨髓间充质干细胞可能通过旁分泌作用影响心脏成纤维细胞的胶原合成,从而参与损伤心肌的修复。     

卡维地洛对高血压大鼠心脏成纤维细胞胶原合成的抑制作用

目的 :探讨卡维地洛、比索洛尔、哌唑嗪对培养的 SHR和 Wistar大鼠心脏成纤维细胞 （ CFs）胶原合成的影响。方法 :采用胰酶消化法培养 CFs,用3 H-脯氨酸掺入法分别观察卡维地洛、比索洛尔、哌唑嗪干预下两组大鼠 CFs胶原合成的情况。结果 :1各种浓度的卡维地洛 （ 0 .0 1～ 10μmol/ L ）可以浓度依赖的方式抑制 CFs 3 H-脯氨酸掺入量 ,与 Wistar大鼠组相比 ,SHR组 CFs受抑制的效应更强。2同等浓度比索洛尔对两组大鼠 CFs3 H-脯氨酸掺入量表现出轻度抑制。 3同等浓度哌唑嗪对两组大鼠 CFs3 H-脯氨酸掺入量均无明显影响。结论 :卡维地洛呈浓度依赖性抑制 CFs合成胶原 ,其作用机制部分与阻滞β1 受体有关。     

自发性高血压大鼠心脏成纤维细胞生物活性的变化

目的观察基础状态下成年高血压大鼠（SHR）心肌成纤维细胞（CFs）的吸光值、增殖细胞核抗原（PCNA）表达、3H-胸腺嘧啶核苷（3H-TdR）及3H-脯氨酸掺入法（3H-Proline）掺入量和NO含量的变化。方法胰酶消化法分离、培养大鼠CFs,分别用改良的MTT比色法、免疫组化法3、H-TdR掺入法观察CFs的增殖状况,用3H-Proline观察CFs的胶原合成情况,用硝酸还原酶法检测CFs培养液中的NO含量。结果培养72 h,SHR组与正常血压组比较,CFs吸光值、PCNA表达3、H-TdR及3H-Proline掺入量增高具有非常显著意义（P<0.01）,NO含量降低也具有非常显著意义（P<0.01）。结论CFs在维持基质间隙中起着关键作用,其增殖、胶原合成以及NO含量的异常都可以导致左心室肥厚的产生和发展。     

比索洛尔对高血压大鼠心肌成纤维细胞增殖及胶原合成的影响

目的:探讨比索洛尔对培养的高血压大鼠（SHR）和W istar大鼠心脏成纤维细胞（CFs）增殖及胶原合成的影响。方法:采用胰酶消化法培养CFs,采用3H-胸腺嘧啶核苷（3H-TdR）掺入法测定CFs的DNA合成功能,四氮唑蓝（MTT）比色法测定细胞增殖,3H-脯氨酸（3H-Proline）掺入法测定胶原合成。结果:①基础状态下,SHR组CFs的3H-Proline掺入量3、H-TdR掺入量及MTT比色法A值均明显高于W istar组。②不同浓度比索洛尔对两组大鼠CFs3H-TdR掺入量及MTT比色法A值均无明显作用。③不同浓度比索洛尔以浓度依赖的方式抑制CFs3H-Proline掺入量,与W istar大鼠组相比,SHR组CFs受抑制的效应更强。结论:SHR的CFs细胞数目、DNA合成及胶原含量均存在异常,比索洛尔呈浓度依赖性抑制CFs的胶原合成,但对CFs增殖及DNA合成无明显作用。     

AngⅡ、TGF—β1和FN对自发性高血压大鼠心肌成纤维细胞合成胶原的影响

目的 观察血管紧张素Ⅱ（AngⅡ）、转化生长因子β1（TGF－β1)、洛沙坦（Losartan)、纤维粘连蛋白（FN）对培养的SHR和WKY大鼠心肌成纤维细胞（CFb)合成胶原的影响。方法 采用组织块贴壁法培养CFb,分别测定AngⅡ、TGF－β1、Losartan、FN干预下CFb的^3H-脯氨酸（^3H-Proline)掺入量。结果 AngⅡ、TGF－β1、FN促进CFb的^3H-Proline掺入量,Losartan抑制10^-7M AngⅡ诱导的CFb的^3H-Proline掺入。结论 AngⅡ、TGF－β1、FN对CFb的胶原合成有促进作用,Losartan可拮抗AngⅡ的作用。     

非诺贝特对糜酶诱导的大鼠心脏成纤维细胞增殖及胶原合成的影响

目的: 探讨过氧化物酶增殖物激活受体α(PPARα)激动剂非诺贝特对心脏肥大细胞糜酶诱导的心脏成纤维细胞增殖及胶原合成的影响。方法: 分离、培养新生SD大鼠心脏的成纤维细胞,采用MTT比色法(A490值)测定细胞数目。用流式细胞仪分析细胞周期。用3H-脯氨酸掺人法测定总胶原合成,实时定量PCR检测I型和Ⅲ型胶原mRNA的表达。结果: MTT比色法的结果显示,与正常对照相比,糜酶作用后A490值升高为0.42±0.05,而给予不同浓度的非诺贝特后,A490值降低为0.35±0.06（50 mg/L）及0.28±0.05（100 mg/L）,明显低于单纯糜酶组(P<0.05)。3H-脯氨酸掺入法的结果显示,与正常对照组相比,糜酶作用24 h后,心脏成纤维细胞3H-脯氨酸掺入量升高为789±67;而给予糜酶+非诺贝特后,3H-脯氨酸掺入量明显低于单纯糜酶组(P<0.05)。PCR的结果显示,与正常对照组相比,糜酶作用24 h后,心脏成纤维细胞中Ⅰ、Ⅲ型胶原mRNA表达的水平显著升高(P<0.05);而给予糜酶+非诺贝特后,两型胶原mRNA的表达明显低于单纯糜酶组(P<0.05)。流式细胞仪分析的结果显示,单纯糜酶处理后,S期细胞的百分率和细胞的增殖指数明显增加;而非诺贝特则能显著抑制这些改变。结论: PPARα激动剂非诺贝特能够抑制糜酶诱导的心肌纤维化,可能是今后逆转心肌纤维化的另一个有效途径。     

硝普钠对人血管平滑肌细胞合成胶原的抑制作用

目的 探讨内皮素（ET-1）对人血管平滑肌细胞（HVSMC）合成胶原的影响，并观察硝普钠（SNP）对HVSMC合成胶原的影响。方法 将ET-l10^-8mol／L和不同浓度SNP加人体外培养HVSMC。培养24h后测培养液中NO含量，测细胞内cGMP含量及^3H-脯氨酸掺人量即总胶原含量。结果 加入梯度浓度SNP，NO水平呈剂量依赖性增加（均P〈0．01）；ET-1使胶原合成量增加80％（P〈0．01），加入梯度浓度SNP较ET-1组胶原合成量分别减少了38％、42％、57％（均P〈0．01），呈剂量依赖性；ET-1＋SNP低、中、高浓度组较ET-1组细胞内cGMP含量明显增加（均P〈0．01），且cGMP含量随SNP增加而增加；细胞内cGMP含量与胶原合成量呈良好负相关关系（r=-0．93）。结论 ET-1可引起HVSMC合成胶原增多；SNP可剂量依赖地抑制HVSMC合成胶原；SNP对胶原合成的抑制作用可能是通过cGMP途径起作用。     

异鼠李素对AngⅡ诱导新生大鼠心脏成纤维细胞增殖和胶原合成的影响

目的探讨异鼠李素(Isorhamnetin)对血管紧张素Ⅱ(AngⅡ)诱导新生大鼠心脏成纤维细胞(CFb)增殖和胶原合成的影响.方法建立AngⅡ诱导新生大鼠CFb纤维化模型,采用MTT比色法检测CFb增殖;采用3H-脯氨酸掺入法检测CFb胶原合成,分别观察不同浓度异鼠李素对CFb增殖和胶原合成的影响.结果在一定范围内,异鼠李素以浓度依赖性方式抑制AngⅡ诱导CFb的增殖和胶原合成(P＜0.01).结论异鼠李素具有抑制CFb增殖和胶原合成的作用,对心肌纤维化具有一定的防治效应.     

抗纤维化短肽N-乙酰基-丝氨酰-天门冬酰-赖氨酰-脯氨酸对大鼠心脏成纤维细胞胶原合成与降解的调节作用

目的探讨N-乙酰基-丝氨酰-天门冬酰-赖氨酰-脯氨酸（AcSDKP）对血小板源性生长因子（PDGF）诱导的大鼠心脏成纤维细胞增殖、胶原合成和降解代谢的调节作用。方法分离培养新生大鼠心脏成纤维细胞。采用^3H-TdR和。H-脯氨酸掺入法分别检测心脏成纤维细胞增殖与胶原蛋白合成。Western blot法检测心脏成纤维细胞Ⅰ、Ⅲ型胶原蛋白表达和基质金属蛋白酶（MMP）-1蛋白的表达。明胶酶谱法检测心脏成纤维细胞MMP-2和MMP-9活性的表达。结果PDGF促进心脏成纤维细胞增殖、胶原合成,Ⅰ、Ⅲ型胶原表达,以及MMP-2、MMP-9活性和MMP-1表达。AcSDKP对PDGF介导的心脏成纤维细胞增殖、胶原合成均有抑制作用。AcSDKP上调由PDGF介导的心脏成纤维细胞MMP-2、MMP-9活性和MMP-1的表达。结论AcSDKP抑制PDGF介导的心脏成纤维细胞增殖和胶原的合成,上调MMPs活性或表达,促进胶原的降解,这些可能与AcSDKP抗心脏纤维化作用相关。     

血管紧张素ⅡⅠ型受体反义寡核苷酸逆转心肌成纤维细胞增殖及胶原合成的实验研究

目的 :用血管紧张素 （Ang ） 型受体 （AT1 R）反义寡核苷酸 （AS- ODN）体外逆转心肌成纤维细胞增殖及胶原合成。方法 :将培养的乳鼠心肌成纤维细胞分为正常组、Ang 组、AT1 R- AS- ODN组 ,观察 Ang 及 AT1 R-AS- ODN对心肌成纤维细胞 c- jun基因表达、成纤维细胞增殖、3H- Proline掺入率的影响。结果 :Ang 可刺激心肌成纤维细胞增殖、c- jun基因表达增多、3H - Proline掺入率增加。 AT1 R- AS- ODN能逆转 Ang 的上述作用。结论 :AT1 R- AS- ODN能有效逆转 Ang 诱导的心肌成纤维细胞增殖及胶原合成。     

The regulatory role of AT 1 receptor on activated HSCs in hepatic fibrogenesis:effects of RAS inhibitors on hepatic fibrosis induced by CCl(4)

AIM:To assess the effect of ACE inhibitor and Ang II type 1 (AT1) receptor antagonist in preventing hepatic fibrosis caused by CCl(4) administration in rats;to investigate whether or not there are expression of AT 1 receptors on hepatic stellate cells; and to observe the effect of Ang II on proliferation and ECM synthesis of cultured HSCs.METHODS:Studies were conducted in male Sprague-Dawley rats. Except for the hepatofibrotic model group and the control group, in three treated groups, either enalapril (5mg/kg), or losartan (10mg/kg), or enalapril + losartan were given to the fibrotic rats by daily gavage, and saline vehicle was given to model and normal control rats. After 6 weeks, liver fibrosis was assessed directly by hepatic morphometric analysis, which has been considered the gold standard for the quantification of fibrosis. The expressions of AT 1 receptors and (alpha-mooth muscle actin,alpha-SMA) in liver tissue or isolated hepatic stellate cells (HSCs) were detected by immunohistochemical techniques. The effect of Ang II on HSC proliferation was determined by MTT method. Effect of Ang II on collagen synthesis of HSCs was determined by (3)H-proline incorporation.RESULTS:Contrasted to the fibrosis in rats of the model group, groups of rats treated with either enalapril or losartan, or a combination of two drugs showed a limited expansion of the interstitium (4.23 plus minus 3.70 vs 11.22 plus minus 4.79, P<0.05), but no difference was observed among three treated groups (5.38 plus minus3.43, 4.96 plus minus 2.96, 4.23 plus minus 2.70, P>0.05). Expression of AT 1 receptors was found in fibrotic interstitium of fibrotic rats, whereas in normal control rats they were limited to vasculature only to a very slight degree. AT 1 receptors were also expressed on activated HSCs in the culture. At concentrations from 10(-9) to 10(-5)mol/L, Ang II stimulated HSC proliferation in culture in a dose dependent manner. Increasing Ang II concentrations produced corresponding increases in (3)H-proline incorporation. Differences among groups were significant.CONCLUSION:Angiotensin converting enzyme inhibitors and AT 1 blocker may slow the progression of hepatic fibrosis;activated HSCs express AT 1 receptors, and Ang II can stimulate the proliferation and collagen synthesis of HSCs in a dose-dependent manner; and activation of RAS may be related to hepatic fibrogenesis induced by CCl(4).     

低密度脂蛋白对大鼠肝贮脂细胞的调控作用

目的研究低密底脂蛋白（ＬＤＬ）对大鼠肝贮脂细胞（ＦＳＣ）的调控作用。方法采用放射配体结合法检测肝ＦＳＣ是否存在ＬＤＬ受体。通过噻唑蓝（ＭＴＴ）法、透明质酸（ＨＡ）放射免疫分析法及３Ｈ－脯氨酸掺入法测定ＬＤＬ对ＦＳＣ增殖、ＨＡ及胶原合成的影响。结果大鼠肝脏ＦＳＣ上存在特异性的、高度亲和性的及可饱和性的ＬＤＬ结合位点：ＬＤＬ能促进ＦＳＣ增殖、ＨＡ及胶原合成。结论ＬＤＬ参与ＦＳＣ增殖、转化和基质合成，并可能通过受体介导影响ＦＳＣ功能。     

辛伐他汀对大鼠肺成纤维细胞增殖和胶原合成的影响及意义

目的探讨辛伐他汀（SIM）对肺成纤维细胞（LF）的增殖、胶原合成及基质金属蛋白酶-2（MMP-2）分泌的影响。方法用消化法培养新生SD大鼠的LF，给予不同浓度的SIM干预。四氮唑蓝（MTT）比色法检测细胞增殖，细胞免疫组化法测定细胞胶原的合成，ELISA法测定细胞培养上清液MMP-2的含量。结果随着SIM浓度（5，10，50μmol／L）的增高，MTT比色法A490值、LF表达Ⅰ、Ⅲ型胶原的平均光密度值（A）及培养上清液中的MMP-2含量均呈递减的趋势，与对照组相比，差异均非常显著（均P〈0．01）。加入200μmol／L甲羟戊酸可明显拮抗此作用（P〈0．01）。均具有统计学意义。结论降脂药物SIM具有抑制基本的成纤维细胞生长因子促LF增殖和胶原合成的作用，并可减少MMP-2的分泌，抑制LF黏附迁移功能，可能对防止肺移植术后闭塞性细支气管炎有一定的潜在临床应用价值。     

Effect of caffeic acid phenethyl ester on proliferation and apoptosis of hepatic stellate cells in vitro

AIM: To investigate the role of nuclear factor-κB (NF-κB)inhibitor caffeic acid phenethy1 ester (CAPE) in the proliferation, collagen synthesis and apoptosis of hepatic stellate cells (HSCs) of rats. METHODS: The HSCs from rats were isolated and cultured in Dulbecco's Modified Eagle's Medium (DMEM) and treated with CAPE. The proliferation and collagen synthesis of HSCs were determined by 3H-TdR and 3H-proline incorporation respectively, and the expression of type Ⅰ, Ⅲ procollagen genes was further explored byin situ hybridization. Apoptosis cell indices (AIs) were examined using terminal deoxynucleotidyl transferase- mediated DIG-dUTP nick end labeling (TUNEL). RESULTS: Tn activated HSC in culture, CAPE significantly inhibited 3H-TdR and 3H-proline incorporation by HSCs at concentrations of 5 μmol/L and 10 μmol/L respectively. CAPE also reduced the type I procollagen gene expression (P＜0.05)at higher concentration. Apoptosis of HSC was induced by CAPE and the AIs were time-and dose-dependently increased from 2.82+0.73 % to 7.66±1.25 % at 12 h (P＜0.01) and from 3.15±0.88 % to 10.6L±2.88 % at 24 h (P＜0.01). CONCLUSION: CAPE inhibits proliferation and collagen synthesis of HSC at lower concentration and induces HSC apoptosis at higher concentration.     

Autoradiographic analysis of cell proliferation and protein synthesis in the pulmonary trunk of rats during the early development of hypoxia-induced pulmonary hypertension

The results of this study indicate that both cell proliferation and increased synthesis of extracellular matrix protein contribute to hypertrophy of the rat pulmonary trunk during the early development of hypoxia-induced pulmonary hypertension. As determined by autoradiography after 3H-thymidine injection, pulmonary hypertension results in increased labelling in all cell compartments of the pulmonary trunk wall, the most dramatic response occurring in the adventitia following 3 days' hypoxic exposure. Autoradiography also demonstrated differences in the degree of incorporation of 3H-proline into extracellular protein between hypoxic (3 and 21 days) and control rats. The major focus of 3H-proline incorporation shifted from the adventitia at 3 days to the tunica media at 21 days, although incorporation was significantly higher at 3 compared to 21 days in all wall compartments. The patterns of hyperplasia and matrix protein synthesis in the extrapulmonary arteries of the rat, as reported here, are distinctly different from those seen in many large elastic arteries during development of systemic hypertension. For example, the hyperplastic response of arterial vessels follows a similar temporal sequence in pulmonary and systemic hypertension. However, the adventitia is the region of the pulmonary trunk with highest cell proliferation in pulmonary hypertension while the media is most affected by systemic hypertension. The relevance of the changing patterns of cell proliferation and protein synthesis in the wall of the pulmonary trunk of chronically hypoxic rats to the structural and biochemical properties of this vessel during the early development of pulmonary hypertension is discussed.     

三氟拉嗪对贮脂细胞增殖及胶原合成的影晌

目的:探讨三氟拉嗪抗肝纤维化作用的机制。方法:采用链酶蛋白酶、胶原酶及密度梯度离心,分离大鼠肝脏贮脂细胞,用MTT方法及~3H-脯氨酸掺入方法,观察了三氟拉嗪对贮脂细胞增殖的调控。结果:低浓度三氟拉嗪的抑制作用不明显(P>0.05),当药物浓度上升为10～20μmol/L~(-1)时,抑制作用增强,呈明显药物浓度依赖关系。结论:三氟拉嗪可通过抑制贮脂细胞的增殖及胶原合成,而达到抗肝纤维化的作用。     

17β-雌二醇抑制碱性成纤维细胞生长因子诱导的血管外膜成纤维细胞增殖

目的探讨17β-雌二醇(E2)对碱性成纤维细胞生长因子(bFGF)诱导的血管外膜成纤维细胞(VAF)增殖的影响。方法将培养的血管外膜成纤维细胞分4组:对照组,单纯bFGF组,单纯E2组,bFGF+E2组。用3H-Tdr掺入反映细胞DNA合成3、H-Proline掺入反映细胞的胶原合成状况;用Western Breeze检测血管外膜成纤维细胞中细胞外信号调节蛋白激酶(ERK)、丝裂原活化蛋白激酶磷酸酶-1(MKP-1)的蛋白表达及活性。结果bFGF使血管外膜成纤维细胞DNA合成增加18~23倍、胶原合成增加17~21倍、细胞数目增加18~22倍,E2可使bFGF的这些促血管外膜成纤维细胞增殖效应降低约50%。bFGF使VAF中ERK蛋白表达量增加350%,使ERK磷酸化蛋白表达量增加120%,E2使bFGF诱导的VAF中ERK蛋白表达量下降44%,ERK磷酸化蛋白表达量下降22%;E2使bFGF诱导的VAF中MKP-1的蛋白表达量增加154%。结论E2可抑制bFGF诱导的VAF增殖,其抑制VAF增殖与抑制VAF中ERK蛋白表达,降低ERK活性,促进MKP-1表达有关。