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1.
目的探讨阿托伐他汀对糖尿病肾病(DN)患者脂蛋白(a)[Lp(a)]、组织纤溶酶原激活物(tPA)以及纤溶酶原激活抑制物-1(PAI-1)的影响。方法60例DN患者随机分为2组,治疗组患者给予阿托伐他汀20mg每日1次睡前服用,对照组给予安慰剂,共6周,治疗前后所有患者测定血糖、肾功能、总胆固醇(TC)、甘油三脂(TG)、高密度脂蛋白-C(HDL-C)、低密度脂蛋白-C(LDL-C)、PAI-1、tPA以及尿白蛋白排泄率(UAER)进行比较。结果6周后,治疗组与对照组相比,TC、TG、LDL-C、Lp(a)、PAI-1活性及UAER下降(P〈0.05或P〈0.01),而HDLC水平和tPA活性上升(P〈0.05)。对照组治疗前后各项指标无明显变化(P〉0.05),而治疗组治疗前后上述指标有显著改变(P〈0.05或P〈0.01)。结论阿托伐他汀在降低DN患者血脂的同时,通过降低Lp(a)改善纤溶系统功能,保护受损的肾脏功能。 相似文献
2.
转化生长因子β1对系膜细胞纤溶酶原激活物抑制物1表达的影响 总被引:6,自引:2,他引:6
目的观察转化生长因子(TGF)β1对肾小球系膜细胞(GMC)纤溶酶原激活物抑制物(PAI)-1表达的影响,并探讨反应性氧基(ROS)在TGF-β1诱导的PAI-1表达中的作用。方法体外培养大鼠GMC,分别用TGF-β1(2ng/ml)和葡萄糖氧化酶(GO)(10mU/ml)刺激,并用BSO和抗氧化剂N-乙酰半胱氨酸(NAC)进行干预处理。采用Western印迹检测PAI-1蛋白表达;RT-PCR和Northern杂交检测PAI-1mRNA表达;合成的荧光素纤溶酶底物测定纤溶酶活性。结果外源性TGF-β1和GO可显著上调大鼠系膜细胞PAI-1蛋白和mRNA的表达并降低纤溶酶活性。BSO可显著增强TGF-β1和GO诱导的系膜细胞PAI-1mRNA的表达;而NAC可显著地逆转由TGF-β1和GO诱导的PAI-1mRNA表达的上调作用。结论TGF-β1可显著上调系膜细胞PAI-1的表达并抑制纤溶酶活性。ROS在TGF-β1诱导的系膜细胞PAI-1表达上调的信号传递途径中可能起了信号传递分子的作用。 相似文献
4.
随着糖尿病肾病的发病率明显升高,糖尿病肾病的发病机制日益受到关注.本文着重对纤溶酶原激活物抑制物1在糖尿病肾病患者中的升高机制、在糖尿病肾病发展中的作用及针对性治疗进行综述. 相似文献
5.
高压诱导大鼠系膜细胞细胞外基质积聚机制及阿托伐他汀的干预作用 总被引:7,自引:0,他引:7
目的探讨高压诱导大鼠系膜细胞细胞外基质(ECM)积聚的可能途径,并观察阿托伐他汀的干预作用。方法将8-15代大鼠系膜细胞置于80mm№高压下培养6、12、24、48h。并进一步分为阿托伐他汀组、TGF—β1反义寡核苷酸组、助溶剂二甲基亚砜(DMSO)对照组、错义寡核苷酸对照组及正常对照组。放射免疫法测定AngⅡ浓度。RT-PCR法测定TGF-β1、胶原纤维(Col)Ⅰ(d1)及纤溶酶原激活物抑制剂(PAI)-mRNA表达量。Western印迹法测定上述各指标蛋白表达。结果阿托伐他汀能显著降低AngⅡ水平。TGF—β1反义寡核苷酸对AngⅡ水平无显著影响。阿托伐他汀和TGF—β1反义寡核苷酸均能明显降低TGF—β1、ColⅠ(d1)及PAI-1mRNA和蛋白水平。错义寡核苷酸和二甲基亚砜对上述指标表达水平无显著影响。结论AngⅡ和TGF-β1参与高压诱导ECM的积聚过程。AngⅡ的作用由TGF-β1介导实现,即存在“压力→AngⅡ→TGF-β1→ECM积聚”作用途径。阿托伐他汀在一定程度上逆转高压诱导的ECM积聚,此作用可通过干预上述途径实现。 相似文献
6.
目的探讨非酒精性脂肪性肝病(NAFLD)大鼠肝脏组织型纤溶酶原激活物(t-PA)及纤溶酶原激活物抑制物-1(PAI-1)基因表达及其意义.方法高脂饮食建立SD大鼠NAFLD模型,分批于造模第8、12、16、24周处死,同期设普通饮食喂养大鼠作对照.通过H-E染色和苦味酸VG染色观察肝组织学改变,应用RT-PCR对肝脏t-PA和PAI-1 mRNA的表达进行相对定量分析.结果模型组大鼠于实验8、12、24周分别形成单纯性脂肪肝、脂肪性肝炎以及脂肪性肝炎并肝纤维化.与对照组相比,模型组大鼠肝脏PAI-1 mRNA表达随造模时间延长而增强,于实验24周达高峰(1.02±0.11比0.51±0.09,P<0.01),并与其肝脂肪变及肝组织学损伤程度呈正相关(r分别为0.492和0.372, P分别<0.01和<0.05).肝脏t-PA mRNA表达随造模时间延长而逐渐减少,于实验24周降至最低(0.89±0.11比1.62±0.10,P<0.01),但其仅与肝组织学损伤程度总积分呈负相关(r=-0.368, P<0.05).结论高脂饮食大鼠肝脏PAI-1及t-PA基因表达改变可能参与NAFLD的发病. 相似文献
7.
纤维蛋白对肾小球内皮细胞表达纤溶酶原激活物及纤溶酶原激活物抑制物的作用 总被引:3,自引:0,他引:3
目的:观察体外培养人肾小球内皮细胞(GEC)表面原位形成的纤维蛋白对GEC表达纤溶酶原激活物及纤溶酶原激活物抑制物(PA/PAI)的影响。方法:应用逆转录聚合酶链反应(RT-PCR),酶谱分析法与反向酶谱法分别在基因转录水平与蛋白质活性水平上检测纤维蛋白对GEC表达tPA,uPA gn PAI-1r 作用,纤维蛋白平板法检测纤维蛋白对GEC PA/PAI系统的综合效应,结果:纤维蛋白能够明显促进tPA,uPA与PAI-1的mRNA表达上调,无血清RPMI 1640培养下的GEC几乎检测不到PAI知性,但可检测到PAI-1的活性。纤维蛋白能够浓度依赖性刺激GEC tPA与uPA活性增加以及PAI01的活性增加,呈浓度依赖性与时间依赖性,相同剂量的纤维蛋白原与纤维蛋白的作用相似,放线菌酮与放线菌素D均可抑制纤维蛋白上调GEC表达tPA,uPA与PAI的作用,纤维蛋白平板法显示,纤维蛋白对GEC PA/PAI系统的综合效应是以升高PA活性为主,其活性能够被抑肽酶完全阻断。结论:肾脏局部毛细血[管内沉积的纤维蛋白可能通过对GEC PA/PAI系统的调节发挥其病理作用。 相似文献
8.
纤溶酶原激活物抑制物-1与糖尿病肾病关系的研究进展 总被引:1,自引:0,他引:1
糖尿病肾病(diabetic nephropathy,DN)是糖尿病(diabetes mellitus,DM)最常见的慢性并发症之一.细胞实验、动物实验、临床研究均证实纤溶酶原激活物抑制物-1(Plasminogen activator inhibitor1.PAI-1)是其重要的致病因素之一.糖尿病(DM)情况下,高血糖、血管紧张素Ⅱ(Angiotensin Ⅱ,Ang Ⅱ)、转化生长因子-β1(transforming growth factor-β1,TGF-β1)、非酶促糖基化终末产物(advanced glycation endoproducts,AGEs)和醛固酮的水平升高等均可上调全身和肾脏局部的PAI-1表达,导致肾小球、肾间质纤维化和肾小管损害,促进DN的发生发展.血管紧张素转化酶抑制剂(ACEI)和血管紧张素Ⅱ受体阻断剂(ARB)、噻唑烷二酮类(thiazolidinediones,TZDs)、双胍类、调脂药、醛固酮受体拮抗剂和抗氧化剂等药物可不同程度阻断上述途径,从而有助防止、延缓DN的发展. 相似文献
9.
白介素1β对肾小球系膜细胞表达纤维蛋白溶解酶原激活物抑制物-1和纤维连接蛋白的影响 总被引:4,自引:1,他引:4
目的探讨白介素1β(IL1β)对人肾小球系膜细胞表达纤维蛋白溶解酶原(纤溶酶原)激活物抑制物1(PAI1)和纤维连接蛋白(FN)的影响。方法应用Northern杂交检测体外培养的肾小球系膜细胞在IL1β刺激后PAI1和FN的mRNA表达,采用纤维蛋白平板法检测系膜细胞培养上清中PAI1的活性,利用ELISA法检测FN的水平。结果IL1β刺激组系膜细胞PAI1和FNmRNA的表达显著增高(与对照组比,P<005),细胞培养上清中PAI1的活性和FN的水平亦明显增加(与对照组比,P<001)。结论IL1β可以上调系膜细胞PAI1和FN蛋白质及mRNA的表达,提示IL1β可能通过抑制细胞外基质降解和增加细胞外基质合成而导致细胞外基质的积聚。 相似文献
10.
史艳玲 《国际泌尿系统杂志》2005,25(5):708-712
纤溶酶原激活物抑制剂是一种丝氨酸蛋白酶抑制剂。最初被认为是一种血管内纤溶抑制剂,现证实PAI-1是一种具有多种功能的蛋白,其作用有依赖于和不依赖于蛋白酶抑制剂两种。不依赖蛋白酶抑制的作用与PAI-1和玻璃粘蛋白或尿激酶受体的相互作用有关。依赖蛋白酶抑制的作用,除纤溶作用外,还参与了细胞外基质的生成及几种酶原和潜在型生长因子的活化。PAI-1参与了几种肾脏病理生理过程,包括血栓性微血管病、增生性或新月体性肾小球疾病。最近,更证实PAI-1在肾脏疾病包括肾小球硬化和小管间质纤维化的进展中起关键作用。对PAI-1还有许多领域正在研究,相信不久还会有新的发现。 相似文献
11.
降糖通脉片对人肾小球系膜细胞及细胞外基质影响的实验研究 总被引:4,自引:1,他引:4
目的:探讨降糖通脉片对人肾小球系膜细胞(MC)及其细胞外基质(ECM)的影响。方法;采用血清药理学方法和体外人肾小球系膜细胞培养技术,观察具有清热化瘀,滋阴补气作用的中药降糖通脉片对MC增殖及其ECM成分的影响。结果:降糖通脉片具有抑制MC增殖及ECM成分中纤维连接蛋白(FN),层粘连蛋白(LN)和IV型胶原(ColIV)的作用,该抑制作用具有一定的量效关系。结论:MC是降糖通脉片发挥治疗作用的 重要靶细胞,抑制MC增殖和ECM的产生可能是该方延缓肾小球硬化的重要机制之一。 相似文献
12.
补肾活血汤治疗系膜增生性肾炎的临床研究 总被引:1,自引:0,他引:1
目的:探讨活血化瘀中药补肾活血汤对系膜增生性肾炎的疗效及其作用机制.方法:将96例经皮肾穿刺活检证实的系膜增生性肾炎患者分成两组,两组患者在接受一般及对症治疗的同时,治疗组50例用补肾活血汤加苯那普利(洛汀新)治疗,对照组46例加用苯那普利治疗.治疗前及治疗2月后分别观察24 h尿蛋白定量、血尿素氮、肌酐、尿红细胞、尿纤维蛋白原降解产物(FDP)、尿补体C3、尿N-乙酰β-D氨基葡萄糖苷酶(NAG)及尿β2-微球蛋白(β2-MG)的变化.结果:两组治疗前、后24 h尿蛋白定量及尿红细胞均有显著下降.补肾活血汤治疗组总有效率明显高于苯那普利对照组(P<0.05).治疗组经治疗后尿FDP、尿NAG及尿β2-MG有明显下降,而对照组则下降不明显.结论:补肾活血汤对系膜增生性肾炎具有治疗作用,其作用机制可能与降低尿中FDP有关. 相似文献
13.
Background: Tumor expression of urokinase-type plasminogen activator (uPA), plasminogen activator inhibitor-1 (PAI-1), and uPA receptor (uPAR) are breast cancer prognostic factors. Less is known about their usefulness in breast cancer diagnosis. Nipple aspirate fluid (NAF) is secreted into the breast duct and collected noninvasively, making it potentially useful both in breast cancer diagnosis and prognosis. We determined the association of uPA, PAI-1, and uPAR levels in NAF with breast cancer (1) detection and (2) advanced disease.Methods: A total of 88 NAF specimens were collected from women with or without breast cancer, and uPA, PAI-1, and uPAR expression were measured by enzyme-linked immunosorbent assay.Results: uPA and uPAR were independent predictors of cancer presence; uPAR was also an independent predictor of advanced disease stage. Higher PAI-1 expression in breast cancer that was found with univariate analysis was not observed after logistic regression was applied.Conclusions: NAF evaluation of uPA, uPAR, and, perhaps, PAI-1 (significant only in univariate analysis) may provide useful breast cancer diagnostic and prognostic information. 相似文献
14.
目的:观察Thy1肾炎大鼠系膜细胞增生及CDK2表达,以及血管紧张素Ⅱ受体拮抗剂缬沙坦对其干预作用。方法:设正常组、Tby1。肾炎组及Tby1肾炎+缬沙坦治疗组。分别于各组疾病诱导后第1、3、5、7d取。肾脏行病理检查,免疫组化检测肾小球内PCNA、CDK2蛋白的表达,Western blot分析肾小球内CDK2的表达。结果:在正常大鼠系膜细胞CDK2存在低表达,而在肾炎大鼠随系膜细胞增生,其CDK2表达增加。缬沙坦治疗组第3~7d。肾小球系膜细胞增生、系膜区扩张程度以及肾小球内PCNA表达低于。肾炎组(P〈0.05),肾小球内CDK2表达也低于。肾炎组相应时间点(P〈0.05)。结论:。肾小球系膜细胞的增生与其CDK2的高表达相关,缬沙坦可抑制系膜细胞CDK2的高表达,抑制系膜细胞增殖及系膜扩张。提示缬沙坦对Thy1肾炎大鼠有一定治疗作用。 相似文献
15.
目的:观察骨碎补总黄酮对系膜增生性肾小球肾炎大鼠血IL-6及尿蛋白的影响。方法:利用免疫法制备大鼠系膜增生性肾小球肾炎模型,将大鼠分为骨碎补总黄酮组(治疗组)、病理对照组(模型组)、正常对照组,检测各组24h尿蛋白、血清IL-6,并观察肾脏病理改变。结果:模型组大鼠肾脏系膜细胞明显增生,与正常对照组比较24h尿蛋白定量及血清IL-6明显升高(P<0.05);治疗组大鼠肾脏系膜细胞增生减轻,24h尿蛋白、血IL-6均明显低于模型组(P<0.05)。结论:骨碎补总黄酮能降低系膜增生性肾小球肾炎大鼠尿蛋白,降低血清IL-6水平,减轻系膜细胞增生和细胞外基质增加,延缓或减轻肾组织损伤,保护肾功能。 相似文献
16.
火把花根对实验性肾炎大鼠肾脏病理改变的影响 总被引:8,自引:2,他引:8
目的:观察中药火把花根对肾炎大鼠模型肾脏病理改变的影响,评价火把花根对肾炎的治疗作用.方法:用兔抗大鼠胸腺细胞免疫血清(ATS),复制大鼠系膜增生性肾炎模型即抗-Thy1肾炎,将实验动物分为3组:对照组、模型组及火把花根治疗组.于治疗第1、2及4周末,各组动物留尿测定尿蛋白,并取肾组织进行常规肾脏病理检查,免疫组织化学方法测定肾小球系膜区纤维连接蛋白(FN)表达,透视电镜观察肾脏超微病理变化,尤其是足细胞变化.结果:实验第1周末模型组尿蛋白明显增多,第4周末仍显著高于对照组(P<0.01).治疗组在各时间点尿蛋白量均较模型组显著下降(P<0.01).肾脏病理学检查见模型组肾小球系膜细胞增生,基质增多,治疗组系膜增生明显减轻;免疫组织化学染色表明见模型组肾小球系膜基质成分FN蛋白表达明显增高,治疗组FN蛋白表达较模型组显著下降(P<0.01).超微病理检查见模型组肾小球足细胞肿胀,大部分节段足突弥漫性融合,系膜基质轻-中度增生,治疗组足细胞无明显肿胀,大部分节段足突排列整齐,少数节段足突部分融合,系膜基质无明显增生.结论:抗-Thy1肾炎模型肾小球存在足细胞病变,主要表现为足细胞肿胀及足突融合,足细胞病变可能是引起蛋白尿的原因之一;火把花根可能部分通过改善足细胞病变而减少蛋白尿;火把花根可以改善其肾脏病理变化,延缓肾硬化的发展. 相似文献
17.
肾疏宁对肾小管间质损害大鼠FN、ColⅢ、PAl-1mRNA的作用 总被引:1,自引:1,他引:1
目的:观察肾疏宁对肾小管间质损害大鼠FN、colm、PAl—lmRNA表达的影响。方法:在系膜增生性肾炎(MsPGN)模型基础上。延长造模时间至12~16周,使其自然发展成肾小管间质损害模型,观察肾疏宁对肾小管间质FN、colm、PAl—lmRNA表达的影响,并设苯那普利为阳性对照组。结果:第12~16周末,造模各组肾小管间质FN、ColⅢ、PAI-1mRNA表达量均明显升高(P〈0.05或P〈0.01),肾疏宁组、苯那普利组均显著低于模型组(P〈0.05或P〈0.01),第12周末,肾疏宁组与苯那普利组比较无统计学差异(P〉0.05),而第16周末,肾疏宁组明显低于苯那普利组(P〈0.01)。结论:肾疏宁能抑制细胞外基质的合成,促进其降解,从而保护肾小管间质损害。 相似文献
18.
Direct effects of simvastatin on proliferation and matrix accumulation in cultured murine mesangial cells 总被引:1,自引:0,他引:1
F. Nogaki E. Muso M. Yashiro K. Kasuno T. Kamata T. Ono S. Sasayama 《Clinical and experimental nephrology》2001,5(2):85-89
Background. 3-Hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitors have been demonstrated to suppress glomerular injuries
in various renal diseases. However, it is not fully clear whether HMG-CoA reductase inhibitors directly regulate matrix protein
accumulation in mesangial cells.
Methods. We investigated the effect of simvastatin (SIM), an HMG-CoA reductase inhibitor, on DNA synthesis in cultured murine mesangial
cells stimulated by fetal calf serum (FCS). We then determined whether SIM affected the expression of regulatory factors of
cell growth and matrix protein accumulation, using Northern analysis.
Results. SIM dose-dependently inhibited FCS-induced DNA synthesis after 24 h of incubation. SIM treatment for 24 h suppressed the
mRNA expression of platelet-derived growth factor (PDGF)-B chain, PDGF receptor β-subunit and c-myc, while the expression of transforming growth factor β (TGF-β) was not affected. Concerning matrix protein synthesis, the
mRNA expression of type IV collagen was suppressed, whereas that of type III collagen was markedly upregulated. As for matrix
turnover proteins, SIM had a markedly suppressive effect on the mRNA expression of plasminogen activator inhibitor-1 (PAI-1),
with a constant expression of tissue-type plasminogen activator (tPA).
Conclusions. These results indicate that SIM may sup-press mesangial cell proliferation in part through the downregulation of PDGF, PDGF-receptor,
and c-myc mRNA expressions. In addition, the suppression of the synthesis of collagen IV and PAI-1 appears to be a direct inhibitory
effect of SIM on glomerular matrix accumulation.
Received: November 13, 2000 / Accepted: December 14, 2000 相似文献
19.
目的研究多囊蛋白-1氨基段(PC-INF)融合蛋白对大鼠肾小球系膜细胞(RMC)Ⅳ型胶原及其降解调控基因表达的影响。方法用实时荧光定量RT-PCR法检测PC-1NF融合蛋白对RMCIV型胶原和细胞外基质(ECM)降解调控基因基质金属蛋白酶、金属蛋白酶1组织抑制剂(MMP-2、TIMP-1)表达的作用。ELISA方法检测培养的细胞上清液中Ⅳ型胶原含量的变化。免疫细胞化学方法观察融合蛋白对细胞核因子c-jun和c-fos表达的影响。Western印迹检测融合蛋白对蛋白激酶C(PKC)-α信号转导通路的影响。结果4mg/LPC-1NF融合蛋白作用48h后,RMCⅣ型胶原mRNA从(103±16)降至(82±11)拷贝,106GAPDH,与对照组比较差异有统计学意义(P〈0.05),培养上清液中的IV型胶原含量也明显降低;MMP2mRNA从(1150±90)升至(2770±)拷贝,106GAPDH,与对照组比较差异有统计学意义(P〈0.01),而TIMP-1mRNA从(5530±480)降至(3040±370)拷贝,106GAPDH,与对照组差异有统计学意义(P〈0.01)。DAB染色显示,融合蛋白作用后,RMC的c-jun和c-fos表达受到明显抑制。RMC经不同浓度PC-1NF融合蛋白作用48h后,随着融合蛋白浓度升高。PKC-α的表达逐渐减弱。结论PC-1NF融合蛋白可通过上调促进ECM降解的MMP-2和抑制ECM降解的TIMP-1之间的比值而促进Ⅳ型胶原降解;还可能通过PKC-α信号转导通路,抑制c-ju.和c-fos表达,从而抑制RMC的增殖和ECM的合成。 相似文献
20.
Effect of dextran on plasma tissue plasminogen activator (t-PA) and plasminogen activator inhibitor-1(PAI-1) during surgery 总被引:2,自引:0,他引:2
Dextran is known to increase the plasminogen activation rate in vitro and to decrease the α2 -antiplasmin activity.
We decided to explore the effect of dextran on plasma tissue plasminogen activator (t-PA) and plasminogen activator inhibitor-1(PAI-1) during surgical trauma.
Thirty-one patients undergoing elective surgery were given 500 ml of 6% dextran 70. Another nine patients serving as controls were given 500 ml of a glucose-electrolyte solution. The activities of t-PA and PAI-1during surgery were determined, as was the concentration of t-PA antigen.
PAI-1activity was decreased by 19% after infusion of 250 ml of dextran. After 500 ml, the activity was reduced by 22% (both P <0.05). The activity of t-PA was increased by 43% and 29% (both P <0.05) and the antigenic amount of t-PA was increased by 18% and 15% (both P <0.05) after infusion of 250 ml and 500 ml of dextran, respectively. No changes in these variables were observed in the control patients.
It is concluded that infusion of dextran promotes fibrinolysis by enhancing plasminogen activation in patients subjected to trauma. Since elevated levels of PAI-1prior to surgery are known to predispose to deep vein thrombosis, which may form already during the operation, the effect of dextran on PAI-1described here may explain its clot preventing properties. 相似文献
We decided to explore the effect of dextran on plasma tissue plasminogen activator (t-PA) and plasminogen activator inhibitor-1(PAI-1) during surgical trauma.
Thirty-one patients undergoing elective surgery were given 500 ml of 6% dextran 70. Another nine patients serving as controls were given 500 ml of a glucose-electrolyte solution. The activities of t-PA and PAI-1during surgery were determined, as was the concentration of t-PA antigen.
PAI-1activity was decreased by 19% after infusion of 250 ml of dextran. After 500 ml, the activity was reduced by 22% (both P <0.05). The activity of t-PA was increased by 43% and 29% (both P <0.05) and the antigenic amount of t-PA was increased by 18% and 15% (both P <0.05) after infusion of 250 ml and 500 ml of dextran, respectively. No changes in these variables were observed in the control patients.
It is concluded that infusion of dextran promotes fibrinolysis by enhancing plasminogen activation in patients subjected to trauma. Since elevated levels of PAI-1prior to surgery are known to predispose to deep vein thrombosis, which may form already during the operation, the effect of dextran on PAI-1described here may explain its clot preventing properties. 相似文献