共查询到19条相似文献,搜索用时 78 毫秒
1.
肾脏疾病患者肾脏局部纤溶酶原激活物抑制物1(PAI-1)表达增加,抑制了肾小球与肾小管间质细胞外基质(ECM)的降解,导致ECM进行性堆积,肾小球基底膜增厚,肾小球硬化。血管紧张素Ⅱ及脂肪酸在转录水平上可上调PAI-1基因表达,高糖、糖基化终末产物增加PAI-1的含量和活性,转化生长因子-β和结缔组织生长因子反义寡核苷酸能诱导PAI-1的产生,从而导致肾小球硬化的发生。而大黄酸抑制PAI-1的产生。PAI-1抑制剂的应用将对防治肾脏疾病起一定的作用。 相似文献
2.
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
3.
目的 建立人纤溶酶原激活物抑制物1(PAI-1)转基因小鼠。方法 利用构建的高效真核表达载体pCAGGS-PAI-1,制备注射用DNA。以显微注射法将目的DNA注入小鼠受精卵,再将受精卵移植到受体母鼠,制备转基因小鼠。经鼠尾组织DNA提取、PCR筛选、Southern杂交、DNA序列测定对转基因小鼠进行鉴定。结果 对获得的29只小鼠经PCR筛选、Southern杂交分析、DNA序列测定,得到了2只整合了人PAI-1 cDNA的转基因小鼠。在刚出生的转基因小鼠尾部及后肢发现出血性改变,免疫组织化学观察到肾脏局部PAI-1表达稍有增高。结论 本研究中,我们建立了人PAI-1基因传基因小鼠,为进一步研究PAI-1在肾脏疾病中调控细胞外基质降解的机制提供了动物模型,为研究利用抗凝、促纤溶疗法慢性肾炎奠定了基础。 相似文献
4.
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
5.
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
6.
纤溶酶原激活物抑制剂-1和肾脏疾病 总被引:3,自引:0,他引:3
史艳玲 《国外医学:泌尿系统分册》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
7.
目的观察尿激酶对糖尿病肾脏病(DKD)患者血纤溶酶原激活物抑制物1(PAI-1)的影响及其临床疗效。方法选择在我院住院的DKD患者88例,其中Ⅲ期43例、Ⅳ期45例。将DKDⅢ、Ⅳ期患者分别分为对照组(DKDⅢ-C组、DKDⅣ—C组)和观察组(DKDⅢ-O组、DKDⅣ—O组)。对照组给予常规降糖、保护肾脏及血管紧张素转化酶抑制剂(ACEI)等药物治疗。观察组在常规治疗的基础上给予尿激酶50000U加入100ml生理盐水中静脉滴注,每天1次,共14d。比较各组24h尿白蛋白量、空腹血糖、血肌酐、D-二聚体和血PAI-1水平。结果DKDⅢ—C组和DKDⅣ—C组治疗前、后24h尿白蛋白量、空腹血糖、血肌酐、D-二聚体和血PAI-1均无统计学差异(P〉0.05)。DKDⅢ-O组和DKDⅣ—O组治疗后24h尿白蛋白量和血PAI-1均降低(P〈0.05),而空腹血糖、血肌酐、D二聚体治疗前、后均无统计学差异(P〉0.05)。治疗后,DKDⅢ-O组血PAI-1及24h尿白蛋白下降程度较DKDⅣ—O组明显(P〈0.01)。结论尿激酶可通过降低血PAI-1水平来减少DKD患者尿白蛋白量,对保护肾功能、延缓DKD进展有积极意义,且小剂量应用未增加出血倾向,对DKD是一种安全有效的治疗方法。 相似文献
8.
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
9.
组织纤溶酶原激活物和纤溶酶原激活物抑制剂-1与腹腔镜手术的关系 总被引:2,自引:0,他引:2
组织纤溶酶原激活物(t-PA)和纤溶酶原激活物抑制剂-1(PAI-1)是纤溶系统的重要组成部分,传统开腹手术,t-PA与PAI-1之间的平衡被打破,导致术后腹腔粘连及血栓形成.腹腔镜手术对人体创伤小,对腹膜刺激少,因此,对t-PA和PAI-1之间的平衡影响减小,术后粘连及血栓形成的发生率及程度也随之降低.本文综述了t-PA和PAI-1与腹腔镜手术方面的研究进展. 相似文献
10.
组织纤溶酶原激活物(t-PA)和纤溶酶原激活物抑制剂-1(PA I-1)是纤溶系统的重要组成部分,传统开腹手术,t-PA与PA I-1之间的平衡被打破,导致术后腹腔粘连及血栓形成。腹腔镜手术对人体创伤小,对腹膜刺激少,因此,对t-PA和PA I-1之间的平衡影响减小,术后粘连及血栓形成的发生率及程度也随之降低。本文综述了t-PA和PA I-1与腹腔镜手术方面的研究进展。 相似文献
11.
血清t-PA和PAI-1水平在腹腔镜手术中的临床意义 总被引:1,自引:0,他引:1
目的:探讨腹腔镜与开腹手术中血浆纤维蛋白溶酶的变化。方法:在腹腔镜与开腹手术前、术后8h分别测量血浆中组织型纤溶酶原激活物(Tissue-type p lasm inogen activator,t-PA),纤溶酶原激活物抑制物-1(P lasm inogen activator inh ib itortype-1,PAI-1)浓度。结果:血浆t-PA浓度在腹腔镜手术和传统腹部手术两组病例术后均下降,但在传统腹部手术组下降更显著(P<0.05),而血浆PAI-1浓度在腹腔镜手术和传统腹部手术两组病例术后均升高,但在传统腹部手术组升高更显著(P<0.05)。结论:本次临床研究结果表明:腹腔镜手术组术前、术后血浆中t-PA、PAI-1浓度的变化小于传统腹部手术组,腹腔镜手术组引起腹腔粘连严重程度也低于传统腹部手术组。 相似文献
12.
目的研究纤溶酶原激活物抑制剂(PAI1)与肝细胞癌(HCC)生物学特性的关系。方法构建LCID20人肝细胞癌裸鼠转移模型(肝癌转移模型)40例,用PAI1试剂盒和PAI1单抗分别做酶活性检测和免疫组化,观测肝癌转移模型发展过程中PAI1的变化。结果肝癌转移模型从肿瘤发生早期(2周)至晚期(5周),血浆PAI1从62±18Au/ml增至154±07Au/ml,P<005。肿瘤组织中PAI1从04±01Au/mg增至08±03Au/mg;血浆中PAI1改变与肿瘤大小和AFP变化相关(r=09648和r=09544,P<005和P<005)。结论肝癌转移模型肿瘤组织及血浆中PAI1随HCC病程进展逐步升高。PAI1与HCC肿瘤增长和AFP升高有良好的相关性。PAI1与HCC侵袭性及预后密切相关 相似文献
13.
采用免疫组化法检测32例膀胱移行细胞癌组织及10例正常膀胱组织中尿激酶型纤溶酶原激活物(uPA)表达,另用底物发色法测定24例膀胱移行细胞癌组织和10例正常膀胱组织中组织型纤溶酶原激活物(tPA)活力。结果显示膀胱肿瘤组织中uPA呈不同程度阳性染色,并与膀胱肿瘤分期分级有关(P<0.05),正常膀胱组织染色阴性。正常膀胱组织和膀胱肿瘤组织之间及不同分期、分级的膀胱肿瘤组织之间tPA活力无显著性差异(P>0.05)。结果表明,uPA可作为判断膀胱肿瘤恶性程度指标之一。 相似文献
14.
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
15.
大黄酸对转化生长因子诱导内皮细胞纤溶酶原激活物抑制物1表达的影响 总被引:25,自引:0,他引:25
目的 探讨大黄酸对转化生长因子β1(TGF-β1)诱导人脐静脉内皮细胞纤溶酶原激活物抑制物1(PAI-1)mRNA表达和蛋白合成的影响。以阐明大黄酸对内皮细胞的保护作用。方法 以人脐静脉细胞系ECV-304为研究对象,Northern blot检测PAI-1mRNA的表达。流式细胞仪法检测PAI-1蛋白的合成。免疫沉淀法和Western blot检测p44/p42丝裂原活化蛋白激酶(MAPK)活性。结果 大黄酸可以快速抑制TGF-β1诱导的内皮细胞PAI-1mRNA的表达,且呈明显的剂量依赖效应。如果作用时间延长,则对蛋白的合成同样具有明显抑制作用。进一步的研究还发现,大黄酸对TGF-β1激活的p44/p42MAPK活性具有明显下调作用。结论 大黄酸对TGF-β1诱导的PAI-1高表达的抑制作用可能是其保护内皮细胞功能从而防治糖尿病及其血管并发症的作用机制之一。 相似文献
16.
目的探讨磷脂酰肌醇蛋白聚糖3(GPC3)是否能促进肝细胞癌(HCC)侵袭、转移。
方法通过siRNA靶向沉默GPC3在人肝癌细胞Hep3B、HepG2中的表达,慢病毒介导GPC3在人肝癌细胞SMMC-7721和SK-HEP-1中过表达,用于体外细胞功能试验和建立体内裸鼠原位种植瘤模型。Western blotting、qPCR检测GPC3、上皮间质转化(EMT)相关分子N-Cadherin、E-Cadherin、SNAIL、Vimentin和基质金属蛋白酶(MMP)-2、MMP-3、MMP-7的表达。
结果过表达GPC3的Hep3B、HepG2细胞株的迁移和侵袭能力显著大于GPC3低表达的SMMC-7721、SK-HEP-1细胞株(P<0.05);小鼠肝脏原位癌模型显示,过表达GPC3的HCC肝脏转移发生率明显高于GPC3低表达者(P<0.05)。过表达GPC3可以降低E-Cadherin,上调N-Cadherin的表达;干扰GPC3表达后,E-Cadherin表达上调,N-Cadherin表达下调。GPC3过表达可显著上调MMP-2、MMP-3、MMP-7的表达(P<0.05)。
结论GPC3可通过诱导HCC发生EMT和分泌MMPs,促进HCC细胞迁移和侵袭。 相似文献
17.
目的:研究高脂饮食喂养小鼠内脏脂肪和皮下脂肪组织中PAI-1、FOXC2及FOXO1表达水平,探讨不同类型肥胖的机制。方法20只小鼠随机分为对照组和高脂组,分别给予正常饮食和高脂饮食喂养12周。测定血清PAI-1以及附睾周围组织及皮下脂肪中PAI-1、FOXC2及FOXO1 mRNA的表达水平。结果高脂组小鼠体质量、血清PAI-1水平均显著高于对照组。组内比较小鼠附睾周围脂肪组织PAI-1、FOXC2mRNA表达显著高于皮下脂肪组织;FOXO1mRNA表达显著低于于皮下脂肪组织,差异有统计学意义。结论正常体重小鼠和肥胖小鼠血清PAI-1水平表达不同,内脏脂肪和皮下脂肪PAI-1、FOXC2及FOXO1表达也存在差别,这种差别可能是不同类型肥胖的机制之一。 相似文献
18.
Summary Fetal rat osteoblast-enriched calvarial cells were used to study the effects of various growth factors and cytokines on plasminogen
activator (PA) and plasminogen activator inhibitor (PAI) activities and the possible relationship of these effects to bone
resorption. Confluent cultures were exposed to various factors under serum-free conditions, and levels of PA and PAI activities
were examined in both conditioned medium (CM) and cell layer using the125I-fibrin plate assay, fibrin zymogram, and reverse fibrin zymogram. According to the125I-fibrin plate assay or zymogram, incubation of cells with acidic fibroblast growth factor (aFGF), basic FGF (bFGF), epidermal
growth factor (EGF), and platelet-derived growth factor (PDGF) elevated the PA activity in the CM as well as in the cell layer
extract. Incubation with interleukin 1α (IL-1α), tumor necrosis factor α (TNFα), and insulin-like growth factor I (IGF-I)
produced no change in PA activity in either CM or cell layer. Addition of transforming growth factor β (TGFβ) to calvarial
cells resulted in nearly undetectable PA activity in CM with the fibrin plate assay but increased PA activity on the fibrin
zymogram after PAI was separated from PA by SDS-PAGE. A reverse fibrin zymogram indicated that PAI activity was greatly enhanced
in TGFβ-treated CM. TGFβ treatment also increased PA activity in the cell layer of calvarial cells. Treatment of calvarial
cells with bFGF and PDGF slightly increased PAI secretion into medium. This increase, however, was not as dramatic as the
increase of PA induced by these two agents. IL-1α and TNFα did not change PAI concentration in CM. No detectable PAI activity
was found in the cell layer in control and treated groups. The PA found in the CM and cell layer of rat calvarial cells was
the urokinase type; the PAI stimulated by TGFβ was the endothelial cell type, PAI-1. The regulation of PA activity by growth
factors and cytokines did not correlate with their resorption-stimulating activities. Thus, PA secreted by osteoblasts may
not be the only factor involved in the initiation of bone resorption. Delineation of the function of PA and PAI in the physiology
of bone tissue awaits further studies. 相似文献
19.
目的 探讨血管壁中尿激酶型纤溶酶原激活物 (uPA)和其受体 (uPAR)表达与血管收缩性重塑和内膜增生的相关性。方法 建立兔髂动脉粥样硬化再狭窄模型 ,比较内膜和中膜层的uPA、uPAR表达及其与内膜面积和血管重塑指数的相关性。结果 内膜层uPA、uPAR的抗原和mRNA表达明显强于中膜层 (P <0 .0 1) ,血管壁内膜uPA、uPAR的抗原和mRNA表达水平与血管重塑指数呈负相关 (r =-0 .870 0 7,P =0 .0 10 9;r =-0 .860 3 8,P =0 .0 13 0和r =-0 .845 5 5 ,P =0 .0 165 ,r =-0 .862 40 ,P =0 .0 12 5 ) ,与内膜面积呈正相关 (r=0 .92 0 0 0 ,P =0 .0 3 3 0 ;r=0 .90 772 ,P =0 .0 0 47和r=0 .92 14 9,P =0 .0 0 3 2 ;r =0 .90 614 ,P =0 .0 0 49) ,血管重塑指数和血管内膜面积与中膜uPA、uPAR表达无明显相关性。结论 内膜层uPA、uPAR高表达增强了血管重建后血管壁收缩性重塑和内膜增生。 相似文献