INTRODUCTIONPlasminogen activator inhibitor type 1 ( PAI-I ), an approximately Mr 50000 glycoprotein, is the major physiological inhibitor of plasminogen activators. It is not only the priming factor for atheroscleros...INTRODUCTIONPlasminogen activator inhibitor type 1 ( PAI-I ), an approximately Mr 50000 glycoprotein, is the major physiological inhibitor of plasminogen activators. It is not only the priming factor for atherosclerosis and coronary thrombosis[1-3] , but also participates in the genesis of chronic hepatitis and liver fibrosis[4-11] . However, there has been no available report yet about the research of hepatic PAl-1 gene expression in hyperlipidemia and fatty liver. The present study aimed to explore the change of hepatic PAl-1 mRNA and its plasma activity by means of animal model.展开更多
Objective.To investigate the effect of peroxis ome proliferator-activated recept ors(PPARs )activators on plasminogen activator inhibitor ty pe-1(PAI-1)expression in human umbilical vein e ndothelial cells and the pos...Objective.To investigate the effect of peroxis ome proliferator-activated recept ors(PPARs )activators on plasminogen activator inhibitor ty pe-1(PAI-1)expression in human umbilical vein e ndothelial cells and the possi-ble mechanism.Methods.Human umbilical vein endothelial ce lls(HUVECs )were obtained from normal fetus,and cul-tured conventionally.Then the HUVECs were exposed to test agents(linolenic acid,linoleic acid,oleic acid,stearic acid and prostaglandin J 2 respectively)in varying concentrations with fresh media.RT -PCR and ELISA were applied to determine the expression of PPARs and PAI-1in HUVECs.Results.PPARα,PPARδand PPARγmRNA were detected by using RT-PCR in HUVECs.Treatment of HUVECs with PPARαand PPARγactivators---linolenic acid,linoleic acid,oleic acid and prostaglandin J 2 respectively,but not with stearic a cid could augment PAI-I mRNA expression and protein secretion in a concentration-dependent manner.However,the mRNA expressions of 3subclasses of PPAR with their activators in HUVECs were not changed compared w ith controls.Conclusion.HUVECs express PPARs.PPARs activators may increase PAI-1expression in ECs,but the underlying mechanism remains uncle ar.Although PPARs expression was not enhanced after stimulated by their activators in ECs,the role of functionally active PPARs in regulating PA I-1expression in ECs needs to be further investigated by using transient gen e transfection assay.展开更多
Background: PAI-1 (plasminogen activator inhibitor-1) is a powerful regulator of fibrinolysis and plasma level is high in type 2 diabetes and cardio-vascular disease, which is determined by genetic polymorphisms in PA...Background: PAI-1 (plasminogen activator inhibitor-1) is a powerful regulator of fibrinolysis and plasma level is high in type 2 diabetes and cardio-vascular disease, which is determined by genetic polymorphisms in PAI-1 gene and environmental factors. The aim of the study was to examine the determinants of plasma PAI-1 Ag level among type 2 diabetes patients. Methods: 491 Tunisian type 2 diabetes patients had clinical evaluation (weight, high, BMI, Waist Circumference), laboratory investigations including FBG Hb1Ac, cholesterol, triglyceride;HDL-cholesterol was done;plasma PAI-1 antigen level was done with ELISA;−675 4G/5G and −844 G/A polymorphisms of PAI-1 gene was done by PCR-ASA and PCR-RFLP respectively. Results: The mean age for our patients was 58.3 ± 10.5 years;sex-ratio = 0.92;mean PAI-1 level was 34.6 ± 21.3 ng/ml. We didn’t find correlation between PAI-1 level and BMI, but we have found significant correlation between PAI-1 and waist circumference (p = 0.032), most enhanced in men (P = 0.002), T2D patients who have FBG > 11 mmol/l had PAI-1 Ag level higher than those who have FBG P = 0.034), but no difference found between T2D with high Hb1Ac > 8% and those with Hb1Ac < 8%, significant correlation was seen between PAI-1 level and LDL-cholesterol (P = 0.05), high correlation between PAI-1 Ag level and −675 4G/5G polymorphism genotype was seen, 4G/4G carriers had the highest PAI-1 level, 4G/5G had intermediary level and 5G/5G had the lowest level (P −844G/A polymorphism genotypes. Using multiple variable linear regression analysis, the independent factor associated with plasma PAI-1 level was −675 4G/5G polymorphism (regression coefficient β = 4.6, P Conclusion: the present study identifies −675 4G/5G not −844 G/A polymorphism of PAI gene as the principal determinant of plasma PAI-1 level in Tunisian T2D patients, the android fat distribution, dyslipidemia and hyperglycemia play a modest role in this variation.展开更多
Objective： To investigate the expressions of plasminogen activator inhibitor type 1 （PAl-1）, C-erbB-2, VEGF and Ki-67 by immunohistostaining and then to evaluate the prognostic value of PAl-1 in node-negative breas...Objective： To investigate the expressions of plasminogen activator inhibitor type 1 （PAl-1）, C-erbB-2, VEGF and Ki-67 by immunohistostaining and then to evaluate the prognostic value of PAl-1 in node-negative breast cancer. Methods： The study included a retrospective series of 62 female patients with axillary lymph node-negative breast cancer. Expressions of PAl-1, C-erbB-2, VEGF and Ki-67 were determined by immunohistostaining on formalin-fixed paraffin-embedded tissue sections from these patients after a median follow-up of 69 months （range 22-117 months）. Correlations with well known clinicopathologic factors were assessed and multivariate survival analyses were performed. Results： High PAl-1 level was positively associated with high histologic grade of the tumors. Disease-free survival （DFS） was significantly shorter for the patients with moderate to intensive expression of PAl-1 than for those with negative （χ^2 = 25.46, P 〈 0.001; χ^2 = 23.07, P 〈 0.001） to mild expression （χ^2 = 19.75, P 〈 0.001; χ^2 = 17.40, P 〈 0.001）. Although on univariate analysis of the prognostic factors, tumor size, location of primary tumor and age as well as expressions of PAl-1, VEGF and Ki-67 were all significantly prognostic factors for DFS （P 〈 0.05）, PAl-1 was the only independent prognostic factor on multivariate analysis （P 〈 0.0001; hazard ratio [HR], 4.041; 95% confidence interval [CI], 1.928-8.468）. Conclusion： These results of the current study indicate that intermediate or high expression of PAl-1 represents a strong and independent unfavorable prognostic factor for the development of recurrence or metastases in axillary node-negative breast cancer.展开更多
BACKGROUND： Many international studies have shown that plasminogen activator inhibitor-1 （PAl-l） 4G/5G promoter polymorphism does not increase the risk for cerebral infarction. OBJECTIVE： Using PCR methodology and...BACKGROUND： Many international studies have shown that plasminogen activator inhibitor-1 （PAl-l） 4G/5G promoter polymorphism does not increase the risk for cerebral infarction. OBJECTIVE： Using PCR methodology and agarose electrophoresis to detect PAI-1 4G/5G promoter polymorphism in patients with recurrent cerebral infarction in the North Jiangsu Province of China, and to compare results with healthy subjects and patients with first-occurrence cerebral infarction in the same region. DESIGN, TIME AND SETTING： Non-randomized, concurrent, control trial. A total of 122 cerebral infarction patients were admitted to Xuzhou Medical College Hospital＇s Department of Neurology and Xuzhou Central Hospital＇s Department of Neurology between July 2003 and August 2006. PARTICIPANTS： The patients consisted of 63 males and 59 females, aged （62 ± 10） years. They were divided into first-occurrence （n = 58） and recurrence （n = 64） groups. In addition, 50 healthy subjects that underwent physical examination in the outpatient department, including 26 males and 24 females, aged （60 ±12） years, were selected as controls. METHODS AND MAIN OUTCOME MEASURES： PAl-1 4G/5G promoter polymorphism was detected and analyzed using PCR methodology and agarose electrophoresis. RESULTS： Significant differences were determined in terms of genotypic frequency and allele frequency of PAI-1 4G/5G promoter polymorphism, in patients with first-occurrence or recurrent cerebral infarction, when compared with healthy subjects （P 〈 0.05）. There was, however, no significant difference between the first-occurrence and recurrence groups （P 〉 0.05）. CONCLUSION： PAl- 1 4G/5G promoter polymorphism is genetic risk factor for cerebral infarction in China. However, it may be associated with recurrence of cerebral infarction in patients from the North Jiangsu Province of China.展开更多
Objective: To observe the effect of different dosages of ligustrazine (LG) on the level of plasminogen activator inhibitor-1 (PAI-1) activity in patients with type 2 diabetes mellitus. Methods: Ninety cases of type 2 ...Objective: To observe the effect of different dosages of ligustrazine (LG) on the level of plasminogen activator inhibitor-1 (PAI-1) activity in patients with type 2 diabetes mellitus. Methods: Ninety cases of type 2 diabetes mellitus inpatients were selected, and randomly divided into LG small dosage group (SDG), LG large dosage group (LDG) and control group. The 120 mg LG, 400 mg LG and normal saline 250 ml were given through intravenous dripping respectively, once daily, 20 days as one treatment course. Before and after treatment, all the patients had their fasting blood taken for PAI-1 and tissue plasminogen activator (t-PA) assessment test to perform the comparative study. Results:Seventy-three out of the 90 patients completed the observation course, the PAI-1 activity of three groups after treatment all lowered compared with that before treatment, and the difference between groups was also significant (all P<0. 01). After treatment the PAI-1 level of SDG and LDG of LG were all markedly lowered (all P<0. 01), the LDG's lowering was more evident than that of SDG, and comparison between these two groups of patients showed significant difference (P<0. 01). Although in the control group there was some difference between before and after treatment, it was not so significant like the above-mentioned two groups (P = 0. 0140). No adverse reaction occurred in the 3 groups during the observation period. Conclusion:LG could safely and effectively lower type 2 diabetes mellitus patient's plasma PAI-1 activity level, and LDG of LG proved to be particularly effective.展开更多
Objective To investigate the effects of transforming growth factor-β1 (TGF-β1 ) on the expression of plasminogen activator inhibitor type 1 (PAI-1 ) mRNA in renal interstitial fibrosis in vitro. Methods Human renal ...Objective To investigate the effects of transforming growth factor-β1 (TGF-β1 ) on the expression of plasminogen activator inhibitor type 1 (PAI-1 ) mRNA in renal interstitial fibrosis in vitro. Methods Human renal interstitial fibroblasts were isolated and cultured in vitro. The cells wers stimulated by TGF-β1 with different concentration (0 to 10ng/ml ) at different time (0 to 48h). The expression of PAI-1 mRNA was assayed by RT-PCR. Results TGF-β1, had dose-dependent and time-dependent effects on the expression of PAI-1 mRNA in renal interstitial fibroblasts. Conclusion TGF-β1 may partic- ipate in renal fibrosis with inducing the expression of PAI-1 mRNA in renal fibroblasts and affecting the synthesis and degradation of extracellular matrix (ECM).展开更多
文摘INTRODUCTIONPlasminogen activator inhibitor type 1 ( PAI-I ), an approximately Mr 50000 glycoprotein, is the major physiological inhibitor of plasminogen activators. It is not only the priming factor for atherosclerosis and coronary thrombosis[1-3] , but also participates in the genesis of chronic hepatitis and liver fibrosis[4-11] . However, there has been no available report yet about the research of hepatic PAl-1 gene expression in hyperlipidemia and fatty liver. The present study aimed to explore the change of hepatic PAl-1 mRNA and its plasma activity by means of animal model.
文摘Objective.To investigate the effect of peroxis ome proliferator-activated recept ors(PPARs )activators on plasminogen activator inhibitor ty pe-1(PAI-1)expression in human umbilical vein e ndothelial cells and the possi-ble mechanism.Methods.Human umbilical vein endothelial ce lls(HUVECs )were obtained from normal fetus,and cul-tured conventionally.Then the HUVECs were exposed to test agents(linolenic acid,linoleic acid,oleic acid,stearic acid and prostaglandin J 2 respectively)in varying concentrations with fresh media.RT -PCR and ELISA were applied to determine the expression of PPARs and PAI-1in HUVECs.Results.PPARα,PPARδand PPARγmRNA were detected by using RT-PCR in HUVECs.Treatment of HUVECs with PPARαand PPARγactivators---linolenic acid,linoleic acid,oleic acid and prostaglandin J 2 respectively,but not with stearic a cid could augment PAI-I mRNA expression and protein secretion in a concentration-dependent manner.However,the mRNA expressions of 3subclasses of PPAR with their activators in HUVECs were not changed compared w ith controls.Conclusion.HUVECs express PPARs.PPARs activators may increase PAI-1expression in ECs,but the underlying mechanism remains uncle ar.Although PPARs expression was not enhanced after stimulated by their activators in ECs,the role of functionally active PPARs in regulating PA I-1expression in ECs needs to be further investigated by using transient gen e transfection assay.
文摘Background: PAI-1 (plasminogen activator inhibitor-1) is a powerful regulator of fibrinolysis and plasma level is high in type 2 diabetes and cardio-vascular disease, which is determined by genetic polymorphisms in PAI-1 gene and environmental factors. The aim of the study was to examine the determinants of plasma PAI-1 Ag level among type 2 diabetes patients. Methods: 491 Tunisian type 2 diabetes patients had clinical evaluation (weight, high, BMI, Waist Circumference), laboratory investigations including FBG Hb1Ac, cholesterol, triglyceride;HDL-cholesterol was done;plasma PAI-1 antigen level was done with ELISA;−675 4G/5G and −844 G/A polymorphisms of PAI-1 gene was done by PCR-ASA and PCR-RFLP respectively. Results: The mean age for our patients was 58.3 ± 10.5 years;sex-ratio = 0.92;mean PAI-1 level was 34.6 ± 21.3 ng/ml. We didn’t find correlation between PAI-1 level and BMI, but we have found significant correlation between PAI-1 and waist circumference (p = 0.032), most enhanced in men (P = 0.002), T2D patients who have FBG > 11 mmol/l had PAI-1 Ag level higher than those who have FBG P = 0.034), but no difference found between T2D with high Hb1Ac > 8% and those with Hb1Ac < 8%, significant correlation was seen between PAI-1 level and LDL-cholesterol (P = 0.05), high correlation between PAI-1 Ag level and −675 4G/5G polymorphism genotype was seen, 4G/4G carriers had the highest PAI-1 level, 4G/5G had intermediary level and 5G/5G had the lowest level (P −844G/A polymorphism genotypes. Using multiple variable linear regression analysis, the independent factor associated with plasma PAI-1 level was −675 4G/5G polymorphism (regression coefficient β = 4.6, P Conclusion: the present study identifies −675 4G/5G not −844 G/A polymorphism of PAI gene as the principal determinant of plasma PAI-1 level in Tunisian T2D patients, the android fat distribution, dyslipidemia and hyperglycemia play a modest role in this variation.
基金Research Programme of the Shanghai Municipal Science and Technology Commission(No.06DZ19505)
文摘Objective： To investigate the expressions of plasminogen activator inhibitor type 1 （PAl-1）, C-erbB-2, VEGF and Ki-67 by immunohistostaining and then to evaluate the prognostic value of PAl-1 in node-negative breast cancer. Methods： The study included a retrospective series of 62 female patients with axillary lymph node-negative breast cancer. Expressions of PAl-1, C-erbB-2, VEGF and Ki-67 were determined by immunohistostaining on formalin-fixed paraffin-embedded tissue sections from these patients after a median follow-up of 69 months （range 22-117 months）. Correlations with well known clinicopathologic factors were assessed and multivariate survival analyses were performed. Results： High PAl-1 level was positively associated with high histologic grade of the tumors. Disease-free survival （DFS） was significantly shorter for the patients with moderate to intensive expression of PAl-1 than for those with negative （χ^2 = 25.46, P 〈 0.001; χ^2 = 23.07, P 〈 0.001） to mild expression （χ^2 = 19.75, P 〈 0.001; χ^2 = 17.40, P 〈 0.001）. Although on univariate analysis of the prognostic factors, tumor size, location of primary tumor and age as well as expressions of PAl-1, VEGF and Ki-67 were all significantly prognostic factors for DFS （P 〈 0.05）, PAl-1 was the only independent prognostic factor on multivariate analysis （P 〈 0.0001; hazard ratio [HR], 4.041; 95% confidence interval [CI], 1.928-8.468）. Conclusion： These results of the current study indicate that intermediate or high expression of PAl-1 represents a strong and independent unfavorable prognostic factor for the development of recurrence or metastases in axillary node-negative breast cancer.
基金the Xuzhou Social Development Foundation of Jiangsu Province, No. 2006046
文摘BACKGROUND： Many international studies have shown that plasminogen activator inhibitor-1 （PAl-l） 4G/5G promoter polymorphism does not increase the risk for cerebral infarction. OBJECTIVE： Using PCR methodology and agarose electrophoresis to detect PAI-1 4G/5G promoter polymorphism in patients with recurrent cerebral infarction in the North Jiangsu Province of China, and to compare results with healthy subjects and patients with first-occurrence cerebral infarction in the same region. DESIGN, TIME AND SETTING： Non-randomized, concurrent, control trial. A total of 122 cerebral infarction patients were admitted to Xuzhou Medical College Hospital＇s Department of Neurology and Xuzhou Central Hospital＇s Department of Neurology between July 2003 and August 2006. PARTICIPANTS： The patients consisted of 63 males and 59 females, aged （62 ± 10） years. They were divided into first-occurrence （n = 58） and recurrence （n = 64） groups. In addition, 50 healthy subjects that underwent physical examination in the outpatient department, including 26 males and 24 females, aged （60 ±12） years, were selected as controls. METHODS AND MAIN OUTCOME MEASURES： PAl-1 4G/5G promoter polymorphism was detected and analyzed using PCR methodology and agarose electrophoresis. RESULTS： Significant differences were determined in terms of genotypic frequency and allele frequency of PAI-1 4G/5G promoter polymorphism, in patients with first-occurrence or recurrent cerebral infarction, when compared with healthy subjects （P 〈 0.05）. There was, however, no significant difference between the first-occurrence and recurrence groups （P 〉 0.05）. CONCLUSION： PAl- 1 4G/5G promoter polymorphism is genetic risk factor for cerebral infarction in China. However, it may be associated with recurrence of cerebral infarction in patients from the North Jiangsu Province of China.
文摘Objective: To observe the effect of different dosages of ligustrazine (LG) on the level of plasminogen activator inhibitor-1 (PAI-1) activity in patients with type 2 diabetes mellitus. Methods: Ninety cases of type 2 diabetes mellitus inpatients were selected, and randomly divided into LG small dosage group (SDG), LG large dosage group (LDG) and control group. The 120 mg LG, 400 mg LG and normal saline 250 ml were given through intravenous dripping respectively, once daily, 20 days as one treatment course. Before and after treatment, all the patients had their fasting blood taken for PAI-1 and tissue plasminogen activator (t-PA) assessment test to perform the comparative study. Results:Seventy-three out of the 90 patients completed the observation course, the PAI-1 activity of three groups after treatment all lowered compared with that before treatment, and the difference between groups was also significant (all P<0. 01). After treatment the PAI-1 level of SDG and LDG of LG were all markedly lowered (all P<0. 01), the LDG's lowering was more evident than that of SDG, and comparison between these two groups of patients showed significant difference (P<0. 01). Although in the control group there was some difference between before and after treatment, it was not so significant like the above-mentioned two groups (P = 0. 0140). No adverse reaction occurred in the 3 groups during the observation period. Conclusion:LG could safely and effectively lower type 2 diabetes mellitus patient's plasma PAI-1 activity level, and LDG of LG proved to be particularly effective.
基金Supported by the Shanghai Municipal Lead Medical Science Foundation(94-Ⅲ-006)
文摘Objective To investigate the effects of transforming growth factor-β1 (TGF-β1 ) on the expression of plasminogen activator inhibitor type 1 (PAI-1 ) mRNA in renal interstitial fibrosis in vitro. Methods Human renal interstitial fibroblasts were isolated and cultured in vitro. The cells wers stimulated by TGF-β1 with different concentration (0 to 10ng/ml ) at different time (0 to 48h). The expression of PAI-1 mRNA was assayed by RT-PCR. Results TGF-β1, had dose-dependent and time-dependent effects on the expression of PAI-1 mRNA in renal interstitial fibroblasts. Conclusion TGF-β1 may partic- ipate in renal fibrosis with inducing the expression of PAI-1 mRNA in renal fibroblasts and affecting the synthesis and degradation of extracellular matrix (ECM).
