Expression of urokinase-type plasminogen activator receptor and plasminogen activator inhibitor-1 in gastric cancer

In gastric cancer, the urokinase-type plasminogen activator (uPA) system plays important roles in invasion and metastasis, processes which entail proteolysis and adhesion. Both the urokinasetype plasminogen activator receptor (uPAR) and the plasminogen activator inhibitor-1 (PAI-1) are thought to be important factors in this system. To clarify the relationship between these two factors and gastric cancer invasiveness, we evaluated the expression of uPAR and PAI-1 in 91 cases of gastric cancer by immunohistochemistry and in situ hybridization. Urokinase-type plasminogen activator receptor-mRNA, PAI-1-mRNA, uPAR and PAI-1 protein were diffusely distributed in the cytoplasm of the cancer cells and concentrated at invasive foci. Urokinase-type plasminogen activator receptor protein expression correlated with lymphatic, venous invasion (P<.01) and lymph node metastasis (P<0.05); uPAR-mRNA expression correlated with lymphatic, venous invasion and lymph node metastasis (P<0.05). Plasminogen activator inhibitor-1 protein expression correlated with lymphatic, venous invasion, lymph node metastasis and depth of invasion (P<0.01); PAI-1-mRNA expression was linked to lymphatic, venous invasion (P<0.01), lymph node metastasis and depth of invasion (P<0.05). This suggests that the proteolytic activity of uPAR and the cellular motility of PAI-1 in gastric cancer cells may determine penetration of lymphatic and blood vessels, whereby lymph node metastasis may be promoted and that the promotion of cellular motility by PAI-1 may influence the depth of cancer invasion.     

纤溶酶原激活剂抑制物的基因多态性与狼疮性肾炎肾小球的微血栓

目的：探讨纤溶酶原激活剂抑制物－1（PAI－1）基因启动子区－675bp4G/5G多态性与狼疮性肾炎（LN）肾小球微血栓形成的关系。方法：选取101例LN患者,所有患者均行经皮肾活检。其中46例患者伴有肾小球毛细血管袢内微血栓（T组）,55例患者不伴血栓（non-T组）。应用PCR－SLP法分析基因型。同时收集肾活检时各患者的临床资料。正常对照组包括128名健康成人。结果：①T组血清肌酐（SCr)水平显著高于non-T组,蛋白尿和血尿也较non-T组严重;但两组间血清抗心磷脂抗体阳性率无差异;②PAI－I基因4G／4G基因型及4G型等位基因与T组显著相关;LN中4G／4G型患者形成袢内血栓的相对风险率为OR＝2．96,95％CI：1．26－6．92。结论：LN肾小球微血栓的形成与PAI－I基因4G／5G多态性密切相关。     

冠心病稳定型心绞痛患者基质金属蛋白酶-9、可溶性E选择素及组织型纤溶酶原激活物抑制剂-1表达变化

目的:探讨冠心病稳定型心绞痛(SAP)患者基质金属蛋白酶-9(MMP-9)、可溶性E选择素(sE-se-lectin)及组织型纤溶酶原激活物抑制剂-1(tPAI-1)表达变化。方法:采用液相芯片分析系统同步检测206例经冠状动脉造影证实的SAP患者及28例健康对照者血清MMP-9、sE-selectin及tPAI-1表达程度,并比较3者之间及与冠状动脉病变程度的相关性。结果:SAP患者血清MMP-9、tPAI-1及sE-selectin表达程度较对照者升高,其中前2项差异有统计学意义(P<0.01);3者变化呈显著正相关(P<0.01)。结论:SAP患者冠状动脉斑块具有一定程度炎性反应,血液呈现高凝状态,故具有一定不稳定性。炎性因子和纤溶系统标记物可能成为判定SAP患者危险分层的依据。     

结肠癌组织中MMP-7、MMP-9的表达及意义

目的观察结肠癌组织中基质金属蛋白酶（MMP）-7、MMP-9的表达,探讨其在结肠癌浸润、转移中的作用。方法采用免疫组化SP法检测50例结肠癌及其切缘组织中MMP-7、MMP-9的表达。结果肿瘤组织中MMP-7、MMP-9阳性表达率分别为68．00％和82．00％,标本切缘组织中分别为0和24．00％,两者相比,P均〈0．05,MMP-7、MMP-9在有淋巴结转移者中的阳性表达率为86．96％和91．30％,显著高于无淋巴结转移者的51．85％和74．07％,P均〈0．05;MMP-7、MMP-9在结肠癌组织中的表达呈正相关,r=0．84,P〈0．05。结论MMP-7、MMP-9高表达可能与结肠癌的浸润、转移有关。     

心肌组织基质金属蛋白酶-3及其抑制物-1的表达与心功能损害

目的 探讨心肌组织基质金属蛋白酶－3（MMP－3）及其抑制物－1（TIMP－1）相对含量与心力衰竭（心衰）的关系。方法 采用RT－PCR方法对31例风湿性心脏病（RHD）心衰患者及8例健康人心室肌组织中MMP－3及TIMP－1含量进行半定量分析;RHD患者术前心功能指标采用超声心动图检查。结果 瓣膜病所致心力衰竭（心衰）病人心肌组织呈心肌重型的病理改变;心衰病人心肌组织MMP－3 mRNA表达较正常人增高,且心功能越差,MMP－3相对含量越高;TIMP－1则相反。结论 MMP－3表达含量的增加及TIMP－1表达含量的降低参与心肌重构,是影响心衰患者心功能恢复的重要因素之一。     

Urokinase type plasminogen activator receptor expression in colorectal neoplasms

Background—The urokinase type plasminogenactivator receptor (uPAR) may play a critical role in cancer invasionand metastasis.
Aims—To study the involvement of uPAR incolorectal carcinogenesis.
Methods—The cellular expression and localisationof uPAR were investigated in colorectal adenomas and invasivecarcinomas by in situ hybridisation, immunohistochemistry, and northernand western blot analyses.
Results—uPAR mRNA expression was found mainly inthe cytoplasm of dysplastic epithelial cells of 30% of adenomas withmild (19%), moderate (21%), and severe (47%) dysplasia, and in that of carcinomatous cells of 85% of invasive carcinomas: Dukes' stages A(72%), B (93%), and C (91%). Some stromal cells in the adjacent neoplastic epithelium were faintly positive. Immunoreactivity for uPARwas detected in dysplastic epithelial cells of 14% of adenomas and incarcinomatous cells of 49% of invasive carcinomas. uPAR mRNA andprotein concentrations were significantly higher in severe than in mildor moderate dysplasia (p<0.05); they were notably higher in Dukes'stage A than in severe dysplasia (p<0.05), and significantly higher inDukes' stage B than in stage A (p<0.05), but those in stage B werenot different from those in stage C or in metastatic colorectalcarcinomas of the liver.
Conclusions—Colorectal adenoma uPAR, expressedessentially in dysplastic epithelial cells, was upregulated withincreasing severity of atypia, and increased notably during thecritical transition from severe dysplasic adenoma to invasivecarcinoma. These findings implicate uPAR expression in the invasive andmetastatic processes of colorectal cancer.

Keywords:urokinase type plasminogen activator receptor; colorectal adenoma; colorectal cancer; adenoma-carcinoma sequence

     

纤溶酶原激活物抑制物-1基因转导对肾小球系膜细胞外基质积聚的影响

目的　利用体外基因转染技术使纤溶酶原激活物抑制物 1(PAI 1)基因过表达 ,直接观察局部PAI 1对大鼠系膜细胞外基质 (ECM)积聚的影响 ,解析ECM积聚的分子机制。方法　以绿色荧光蛋白 (GFP)为报告基因 ,构建PAI 1/GFP融合基因真核表达载体 ,利用脂质体将外源PAI 1cDNA导入体外培养的大鼠系膜细胞。在活细胞状态下 ,动态观察外源基因的表达。用Northern杂交、ELISA方法检测大鼠系膜细胞纤维连接蛋白 (FN)、层连蛋白 (LN)及IV型胶原表达。结果　PAI 1基因转染后 ,转染组大鼠系膜细胞中的培养上清PAI活性明显增高 ,到 2 4小时达最高值 ( 8.16± 0 .62 )IU/ml,与对照组 ( 2 .2 7± 0 .19)IU/ml相比 ,差异有显著性 (P <0 .0 5 )。同时基因转染组FN( 0 .5 1±0 0 3 )、LN( 1.2 6± 0 .0 7)及Ⅳ型胶原 ( 0 .98± 0 .0 8)水平均较对照组明显增高 (P <0 .0 5 )。结论　首次建立了系膜细胞PAI 1的过度表达体系 ,证实细胞过度表达PAI 1可以直接导致ECM的积聚。局部PA/PAI活性的变化可能是调节系膜细胞ECM积聚与降解的重要因素。     

Chromosomal localization of the human urokinase plasminogen activator receptor and plasminogen activator inhibitor type-2 genes: Implications in colorectal cancer

Abstract Activation of the proenzyme of urokinase (uPA) on the surface of cancer cells has been implicated in the initiation of focal proteolytic mechanisms that permit invasion and metastasis by colon cancers. The activity of uPA on the cell surface appears to be a function of the number of uPA-specific receptors (uPAR) and the extent of inhibition of uPA by plasminogen activator inhibitors (PAI). The mapping of the genes coding for uPAR, and for PAI-2, was performed to determine whether their chromosomal localization suggested their involvement in the genetic alterations associated with cancer cell DNA.
This study confirms the localization of the human urokinase plasminogen activator receptor gene to chromosome 19q and, using in situ hybridization, provides a precise localization to chromosome 19q13.2. In addition, our results confirm the previous allocation of the human plasminogen activator inhibitor-2 gene to a location 18q21.3 → 18q21.1, a location that corresponds to the commonest (>70%) somatic deletions found in colorectal carcinomas. The mapping of the uPAR and PAI-2 genes enables the elucidation of their possible involvement in the genetic alterations that determine the invasive and metastatic phenotypes in colorectal cancer.     

Age-related increase of pulse pressure and plasminogen activator inhibitor-1 I/D gene polymorphism in essential hypertension

BACKGROUND: Pulse pressure (PP), a marker of cyclic strain on the arterial wall, is a significant predictor of cardiovascular (CV) risk, particularly regarding the incidence of coronary arterial stenosis. Genes related to haemostatic and/or fibrinolytic factors are consistently influenced in vitro by mechanical strain. OBJECTIVE: The goal of the present study was to determine, in the three genotypes of the plasminogen activator inhibitor (PAI)-1 gene polymorphism, the gender-adjusted difference in the relationships between age and PP in subjects with never treated essential hypertension. RESULTS: In the studied population, the genotype deletion (D)/D at position -675 of the PAI-1 insertion (I)/D gene polymorphism was associated with a significant increase in the adjusted slope of the curve relating age to PP by comparison with the two other genotypes. No comparable difference in age-related changes in systolic, diastolic or mean blood pressure was found. CONCLUSION: In subjects with essential hypertension, the PAI-1 I/D gene polymorphism modulates the age-mediated increase of PP, suggesting new insights on the complex interactions between genes, mechanical factors and CV risk.     

老年糖尿病PAI-1与IR的相关性分析

目的探讨老年糖尿病患者血浆纤溶酶原激活物抑制物-1(PAI-1)活性及基因启动子区4G/5G多态性与胰岛素抵抗(IR)的关系。方法运用等位基因特异性PCR扩增技术对136例老年糖尿病患者PAI-14G/5G多态位点的基因型进行检测,发色底物法测血浆PAI-1活性。结果1老年糖尿病患者血浆PAI-1活性明显升高,空腹胰岛素(FPG)、胰岛素抵抗指数(HOMA-IR)、体重指数(BMI)、4G/5G基因类型与PAI-1活性升高密切相关(P<0.05)。2对照组和伴IR的糖尿病患者的4G/4G基因型频率分别为47.2%和32,5%,两组比较无明显差异(P>0.05),IR组不同基因型患者的PAI-1活性差异显著(P<0.01),4G/4G型者PAI-1活性明显高于4G/5G和5G/5G者(P<0.05)。3胰岛素对PAI-1活性的影响无基因依赖性。结论老年糖尿病患者PAI-1活性升高,FPG、HOMA-IR、BMI与PAI-1活性升高有关,甘油三酯对PAI-1活性的调节存在基因型依赖性。     

Clinical characteristics of TIMP2, MMP2, and MMP9 gene polymorphisms in colorectal cancer

Background and Aim: Genetic variations and the expression profile of matrix metalloproteinases (MMP) and tissue inhibitors of metalloproteinases (TIMP) are involved in the invasion and metastasis of colorectal cancer. Methods: The gene profiles of TIMP2 and MMP were assayed from 333 colorectal cancer using polymerase chain reaction–restriction fragment length polymorphism. Results: TIMP2‐418*G/*G, TIMP2 303*G/*G and MMP9‐1562*C/*C were more frequent in patients than in controls (P = 0.020, P < 0.0001 and P < 0.044, respectively). Frequency of TIMP2‐418*G/*G was higher in patients with metastasis than in those without metastasis, and that of TIMP2 303*G/*G was higher in patients with rectal cancer than in those with colon cancer (P = 0.008 and P = 0.022, respectively). TIMP2‐303*A/*A and MMP2‐1575*G/*G were less frequent in patients than in controls (P = 0.001 and P = 0.005, respectively). The TIMP2‐418*G303*G haplotype was more frequent (P < 0.0001) and MMP2‐1575*G‐735*C haplotype was less frequent in patients than in controls (P = 0.005). Conclusion: Specific single‐nucleotide polymorphism in TIMP2 and MMP appeared to be associated with tumorigenesis and biological behavior in colorectal cancer, which is expected be further verified in a larger cohort in the future.     

脑卒中患者基质金属蛋白酶基因多态性研究

目的探讨基质金属蛋白酶(MMP)-2和MMP-9基因多态性位点与脑卒中的关系。方法选择脑卒中患者348例为脑卒中组和健康体检者235例为对照组,采用限制性片段长度多态性分析技术检测MMP-2基因C1306T、C735T和MMP-9基因C1562T多态的分布特点并进行分析。根据诊断又将脑卒中患者分为脑出血组(116例)、脑梗死组(115例)、脑栓塞组(31例)、腔隙性脑梗死组(86例)。结果与对照组比较,脑卒中组收缩压、舒张压和TG水平明显升高,吸烟、颈动脉粥样硬化比例明显升高,差异有统计学意义(P<0.05)。脑出血组和脑梗死组MMP-9 C1562T的CT+TT基因型频率和T等位基因频率明显高于对照组(P<0.05)。脑梗死组MMP-2C735T的CC基因型频率和C等位基因频率明显高于对照组(P<0.05)。MMP-2、MMP-9各基因型均不是脑卒中预后影响因素。结论 MMP-2 C735T的C等位基因、MMP-9 C1562T的T等位基因是脑梗死的遗传易感基因之一,同时后者也是脑出血的遗传易感基因之一。MMP-2、MMP-9基因多态性与脑卒中预后无关。     

Disruption of tissue-type plasminogen activator gene in mice aggravated liver fibrosis

Background and Aim:  Tissue-type plasminogen activator (tPA) is one of the major components in the matrix proteolytic network whose role in the pathogenesis of liver fibrosis remains unknown. The aim of this study is to investigate the role of tPA in carbon tetrachloride (CCl₄)-induced liver fibrosis.
Methods:  Wild-type and tPA knockout mice (8 mice per group) were injected interperitoneumly with 25% CCl₄ 2 ml/kg twice per week as CCl₄ administration groups and olive oil 2 ml/kg as controls. After 4 weeks, the livers of mice were removed under deep anesthesia and prepared for further studies such as histology, immunostaining, hydroxyproline assay, zymography and western blot analysis.
Results:  Mice lacking tPA developed more severe morphological injury and displayed an increased deposition of collagen in the liver after CCl₄ administration compared with wild-type counterparts. Deficiency of tPA increased α-smooth muscle actin expression in the mice livers. On the other hand, the decrease of matrix metalloproteinase-2 (MMP-2), matrix metalloproteinase-9 (MMP-9) activities, metalloproteinase-13 (MMP-13) expression and a marked increase of tissue inhibitor of matrix metalloproteinase-1 (TIMP-1) expression were found in the liver of CCl₄ administrated tPA^−/− mice compared with wild-type counterparts.
Conclusions:  Deficiency of tPA aggravated liver fibrosis through promoting hepatic stellate cells (HSCs) activation and inhibiting ECM degradation by decreasing MMP-2, MMP-9 activities and disrupting the balance between MMP-13 and TIMP-1.     

Relationship between matrix metalloproteinase-2 mRNA expression and clinicopathological and urokinase-type plasminogen activator system parameters and prognosis in human gastric cancer

AIM: To investigate the relationship between matrix metalloproteinase-2 (MMP-2) mRNA expression and clinicopathologic and urokinase-type plasminogen activator (uPA) system parameter and prognosis in human gastric cancer. METHODS: Expression of MMP-2 mRNA, uPA, and uPA-R mRNA in tumor tissues and ≥5 cm adjacent normal tissues from 67 cases of gastric cancer was studied using RT-PCR and Northern blot respectively.Survival analyses were done using the Kaplan-Meier method. RESULTS: The expression rates of MMP-2 mRNA,uPA and uPA-R mRNA in tumor tissues (31%,41%,and 51%, respectively) were significantly higher than those in ≥5 cm adjacent tissues (19%, 11%, and 9%; X2=4.59,43.58, and 53.24 respectively, P<0.05,0.0001,and 0.0001, respectively). Expression of MMP-2 mRNA was significantly correlated with lymph node metastasis (metastasis: 61.9%, no metastasis: 39.1%, X2= 7.61, P<0.05),Lauren's classification of diffuse/mixed types:54.2%,intestinal type: 26.3%,X2 = 4.25, P<0.05, expression of uPA and uPA-R mRNA (uPA+: 55.1%, uPA-: 22.2% and uPA-R+: 54.9%, uPA-R-: 18.8%, X2=5.72 and 6.40 respectively, P<0.05).Kaplan-Meier survival analysis of MMP-2 mRNA expression did not show significant difference in all 67 cases, but revealed an association of the expression of MMP-2 mRNA, uPA, and uPA-R mRNA with worse prognosis (P= 0.0083, 0.0160, and 0.0094, respectively). CONCLUSION: MMP-2 may play an important role in the development of invasion and metastasis of gastric cancer.     

培哚普利对慢性心力衰竭患者血浆t-PA和PAI-1水平的影响

目的评价培哚普利对慢性心力衰竭(CHF)患者血浆组织型纤溶酶原激活物(t-PA)和纤溶酶原激活物抑制物-1(PAI-1)水平的影响。方法采用酶联免疫吸附法测定60例CHF患者(CHF组)及20例健康人(正常对照组)血浆t-PA、PAI-1水平。CHF组患者又随机均分为常规治疗亚组和培哚普利亚组。培哚普利亚组在常规治疗基础上加用培哚普利2~4mg,每日1次。所有CHF患者治疗2周后复测血浆t-PA、PAI-1水平。结果CHF患者血浆t-PA、PAI-1水平比正常对照组明显增高(P<0.01)。治疗后,培哚普利亚组血浆PAI-1水平比常规治疗亚组明显降低(P<0.01),血浆t-PA水平比常规治疗亚组明显升高(P<0.01)。结论培哚普利不仅可降低PAI-1水平,而且可升高t-PA水平,改善内源性纤溶功能。     

血清APN、PAI-1与糖尿病视网膜病变的相关性研究

目的探讨脂联素（APN）和纤溶酶原激活物抑制物-1（PAI-1）在糖尿病视网膜病变（DR）时的变化规律及临床意义。方法 ELISA法检测2型糖尿病无DR患者30例（NDR组）、2型糖尿病合并DR背景期患者30例（BDR组）、2型糖尿病合并DR增殖期患者30例（PDR组）和健康对照30例（NC组）的血清APN和PAI-1水平,氧化酶法测定FPG、TC、TG、HDL-C、LDL-C水平,免疫抑制比浊法测定HbA1c水平,计算BMI。结果 NC组、NDR组、BDR组、PDR组血清APN和PAI-1水平组间比较差异均有统计学意义（P〈0.05）。血清APN与BMI、FPG、LDL-C、TG呈负相关,与HDL-C呈正相关;PAI-1与TG、HbA1c、BMI呈正相关。结论 APN和PAI-1可能参与了DR的发生和发展,高TG血症、肥胖、高血糖可能是导致PAI-1升高和APN降低的原因。     

吸烟对致敏大鼠肺组织基质金属蛋白酶9及其抑制剂1表达的影响

目的 通过观察吸烟对致敏大鼠肺组织基质相关因子基质金属蛋白酶9(matrix metalloproteinase-9,MMP-9)及金属蛋白酶组织抑制因子1(tissue inhibitor of metallopmteinase-1,TIMP-1)表达的影响,探讨吸烟在支气管哮喘(简称哮喘)气道重塑中的作用.方法 24只雄性Wistar大鼠随机分为对照组、致敏组和吸烟致敏组,每组8只.后两组用卵白蛋白(OVA)致敏并长期(8周)吸人激发,制备哮喘模型,在激发第3周开始,吸烟致敏组大鼠置于自制熏箱内进行被动吸烟.采用免疫组织化学法检测大鼠气道上皮细胞MMP-9、TIMP-1的蛋白表达,同时测量支气管壁的厚度,并用逆转录-聚合酶链反应法检测各组肺组织的MMP-9 mRNA、TIMP-1 mRNA含量.结果 ①吸烟致敏组气道壁厚度[(23.28±2.38)μm2/μm]明显高于致敏组[(20.06±2.94)/μm2/μm]和对照组[(11.64±2.42)μm2/μm](P值均＜0.05),致敏组高于对照组(P＜0.05),②吸烟致敏组肺组织中MMP-9 mRNA表达(0.49±0.02)和气道上皮细胞MMP-9蛋白含量(32.78±2.60)均明显高于致敏组(0.41±0.04,23.05±2.11)和对照组(0.23±0.03,15.88±1.69)(P值均＜0.01),致敏组高于对照组(P值均＜0.01),③吸烟致敏组肺组织中TIMP-1mRNA表达(0.53±0.02)和气道上皮细胞TIMP-1蛋白含量(34.54±2.90)均高于致敏组(0.37±0.05,21.25±2.28)和对照组(0.235=0.04,15.78±1.97)(P值均＜0.01),致敏组高于对照组(P值均＜0.01);④肺组织MMP-9/TIMP-1 mRNA比值:吸烟致敏组(0.91±0.05)低于致敏组(1.12±0.06)和对照组(1.03±0.09)(P值均＜0.01).致敏组高于对照组(P＜0.01),⑤气道上皮细胞MMP-9/TIMP-1蛋白含量比值:吸烟致敏组(0.94±0.03)低于致敏组(1.09±0.07)和对照组(1.01±0.06)(P＜0.05,P＜0.01),致敏组高于对照组(P＜0.01).结论 吸烟可使致敏大鼠肺组织MMP-9和TIMP-1过度表达,比例失调,加重气道重塑.     

The 4G/5G promotor polymorphism of the plasminogen activator inhibitor-1 gene and late lumen loss after coronary stent placement in smoking and nonsmoking patients

BACKGROUND: Instent restenosis remains a significant clinical problem. Identification of patients at risk for instent restenosis may allow selection of individualized appropriate therapeutic approaches. Genetic polymorphisms have been suggested to be associated with the risk of instent restenosis. Smoking is known to influence hemostatic parameters. HYPOTHESIS: This study investigated the influence of the 4G/5G promotor polymorphism of the plasminogen activator inhibitor type I (PAI-1) gene on instent restenosis in smoking and nonsmoking patients. METHODS: In all, 300 consecutive patients (133 nonsmoking; 167 smoking) with elective coronary stent placement and 6-month angiographic follow-up were studied. Quantitative coronary angiography and genotyping with polymerase chain reaction analysis were performed in all patients. RESULTS: Nonsmoking PAI-1 4G/4G carriers showed a significantly greater late lumen loss (n = 38; 0.54 +/- 0.53 mm) compared with nonsmoking PAI-1 4G/5G (n = 68; 0.38 +/- 0.45 mm) or 5G/5G (n = 27; 0.19 +/- 0.23 mm) carriers, analysis of variance (ANOVA) p < 0.001. Smoking patients with the genotypes 4G/4G (n = 46; 0.53 +/- 0.54 mm) and 4G/5G (n = 79; 0.37 +/- 0.41 mm) had a late loss similar to that of nonsmoking patients. Smoking 5G/5G carriers had the highest late loss of all smoking patients (n = 42; 0.63 +/- 0.50); ANOVA p < 0.05; nonsmoking 5G/5G vs. smoking 5G/5G p < 0.001. CONCLUSION: The promotor polymorphism of the PAI-1 gene has a significant influence on instent restenosis after coronary stent implantation. The 5G/5G genotype predisposes nonsmoking gene carriers to less late lumen loss, whereas in smoking gene carriers this genotype is associated with the greatest late lumen loss. This might be explained by an altered expression pattern of hemostatic parameters.     

尿激酶型纤溶酶原激活物途径在大鼠酒精性肝纤维化形成中的作用

目的 通过观察尿激酶型纤溶酶原激活物(uPA)及其抑制物(PAI-1)在大鼠酒精性肝纤维化形成中的动态变化,探讨uPA纤溶途径在酒精性肝纤维化形成中的作用.方法 雄性SD大鼠随机分为空白组、四氯化碳(CCl4)组和造模组.采用56度二锅头酒、玉米油、吡唑混合物灌胃联合腹腔注射CCl4橄榄油溶液(CCl4∶橄榄油=1∶3...