Association of plasminogen activator inhibitor-1 4G/5G promoter polymorphism with recurrent cerebral infarction in China’s North Jiangsu Province

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.

Study on Effect of Different Dosages of Ligustrazine on Level of Plasminogen Activator Inhibitor-1 Activity in Type 2 Diabetes Mellitus Patients

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.

Research on the correlation of serum plasminogen activator inhibitor-1 level to vascular complications in type 2 diabetes mellitus patients with overweight or obesity

Objective:To explore the relationship between serum plasminogen activator inhibitor(PAI-1)level and Type 2 Diabetes Mellitus(T2DM)accompanied by overweight or obesity by observing not only the changes of PAI-1 level in T2DM patients with overweight or obesity,but also glucose and lipid metabolism related indicators,the changes of the inflammatory cytokines secreted by adipocytes,and then making an analysis on the correlation to PAI-1.Methods:36 cases of healthy examinees were selected as normal control group(NC group),and the experimental group can be divided into T2DM group(54 cases),Overweight/Obesity group(35 cases)and T2DM+Overweight/Obesity group(48 cases).Glucose and lipid metabolism related indicators such as fasting blood glucose(FBG),triglyceride(TG),total cholesterol(TC),low density lipoprotein cholesterol(LDL-C),glycated hemoglobin(HbA1c),fasting insulin(FINS),insulin resistance index(IR),body weight index(BMI)and inflammatory cytokines interleukin-6(IL-6),tumor necrosis factor(TNF-α)and PAI-1 were observed and compared between groups,and then made an analysis to explore the correlation of these factors to PAI-1.Results:(1)Compared with NC group,the levels of FBG,HbA1c,FINS and IR were increased in T2DM group,and the difference was of statistical significance.However,there was no statistically significant difference in TG,TC,LDL-C and BMI between NC group and T2DM group;the levels of FINS,IR,TG,LDL-C,TC and BMI were elevated in Overweight/Obesity group,and the difference was of statistical significance.However,there was no statistically significant difference in FBG and HbA1c;the levels of FBG,HbA1c,FINS,IR,TG,LDL-C,TC and BMI were up-regulated in T2DM+Overweight/Obesity group,and the difference was of statistical significance.Compared with T2DM group,the levels of TG,TC,LDL-C and BMI were increased in Overweight/Obesity group,and the difference was of statistical significance,however,the levels of FBG,HbA1c,FINS and IR were decreased,and the difference was statistically significant;The levels of FINS,IR,TG,TC,LDL-C and BMI were elevated in T2DM+Overweight/Obesity group,and the difference was of statistical significance,however,there was no statistically significant difference in FBG and HbA1c.Compared with Overweight/Obesity group,the levels of FBG,FINS,IR,HbA1c and LDL-C were increased in T2DM+Overweight/Obesity group,and the difference was of statistical significance.However,the difference in TG,TC and BMI was not statistically significant.(2)Compared with NC group,the levels of IL-6,TNF-αand PAI-1 were increased in T2DM group,Overweight/Obesity group and T2DM+Overweight/Obesity group,and the difference was statistically significant.Compared with T2DM group,the levels of IL-6 and TNF-αwere elevated in Overweight/Obesity group,and the difference was of statistical significance,but there was no statistically significant difference in PAI-1;the levels of IL-6,TNF-αand PAI-1 were up-regulated in T2DM+Overweight/Obesity group,and the difference was statistically significant.Compared with Overweight/Obesity group,there was no statistically significant difference in IL-6 and TNF-αbetween T2DM+Overweight/Obesity group and Overweight/Obesity group,but the level of PAI-1 was increased in T2DM+Overweight/Obesity group,and the difference was of statistical significance.(3)Multivariate Logistic Regression Analysis showed that HbA1c,IR,TG,BMI,IL-6 and TNF-αwere independently associated with the level of PAI-1(all p<.05).Conclusions:(1)The level of PAI-1 is higher in type 2 diabetes mellitus patients with overweight or obesity than that in patients only with type 2 diabetes mellitus,and it is one of causes that result in vascular complications.(2)The increase in the level of PAI-1 is considered to be associated with IL-6 and TNF-αsecreted by adipocytes.

Overexpression of hepatic plasminogen activator inhibitor type 1 mRNA in rabbits with fatty liver

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.

Genetic and Metabolic Determinants of Plasminogen Activator Inhibitor 1 (PAI-1) in Tunisian Type 2 Diabetes Patients

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;&minus;675 4G/5G and &minus;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 &minus;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 &minus;844G/A polymorphism genotypes. Using multiple variable linear regression analysis, the independent factor associated with plasma PAI-1 level was &minus;675 4G/5G polymorphism (regression coefficient β = 4.6, P Conclusion: the present study identifies &minus;675 4G/5G not &minus;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.

THE INCREASE IN PLASMINOGEN ACTIVATOR INHIBITOR TYPE-1 EXPRESSION BY STIMULATION OF ACTIVATORS FOR PEROXISOME PROLIFERATOR-ACTIVATED RECEPTORS IN HUMAN ENDOTHELIAL CELLS

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.

Expression and prognostic value of plasminogen activator inhibitor type 1 in node-negative breast cancer

Objective:To investigate the expressions of plasminogen activator inhibitor type 1 (PAI-1), C-erbB-2, VEGF and Ki-67 by immunohistostaining and then to evaluate the prognostic value of PAI-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 PAI-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 PAI-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 PAI-1 than for those with negative (χ2 = 25.46, P < 0.001; χ2 = 23.07, P < 0.001) to mild expression (χ2 = 19.75, P < 0.001; χ2 = 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 PAI-1, VEGF and Ki-67 were all significantly prognostic factors for DFS (P < 0.05), PAI-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 PAI-1 represents a strong and independent unfavorable prognostic factor for the de-velopment of recurrence or metastases in axillary node-negative breast cancer.

EFFECTS OF TGF-β_1 ON THE EXPRESSION OF PLASMINOGEN ACTIVATOR INHIBITOR TYPE 1 IN CULTURED HUMAN RENAL INTERSTITIAL FIBROBLASTS

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).

血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6在结核性胸膜炎胸膜纤维化患者中的变化及临床意义

目的探讨血清和胸腔积液纤溶酶原激活剂抑制物-1(PAI-1)、转化生长因子-β(TGF-β)、血管内皮生长因子(VEGF)、白细胞介素-6(IL-6)在结核性胸膜炎胸膜纤维化患者中的变化及临床意义。方法选取2020年7月至2023年7月该院收治的103例结核性胸膜炎胸膜纤维化患者作为研究对象,治疗2周后,根据糖皮质激素治疗疗效将其分为显效组、非显效组。比较两组治疗前及治疗1、2周后血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平。采用Spearman相关分析血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平与疗效的相关性。治疗2周后血清PAI-1、TGF-β、VEGF、IL-6水平与胸腔积液中该指标水平之间进行Pearson相关分析。绘制受试者工作特征曲线分析治疗1、2周后血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平对结核性胸膜炎胸膜纤维化患者疗效的预测价值。结果两组治疗1、2周后血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平低于治疗前,显效组治疗1、2周后血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平低于非显效组,差异有统计学意义(P<0.05)。治疗1、2周后血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平与疗效呈负相关(P<0.05)。治疗2周后血清PAI-1、TGF-β、VEGF、IL-6水平和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平呈正相关(r=0.761、0.783、0.812、0.741,均P<0.05)。治疗1、2周后血清和胸腔积液各指标联合检测的曲线下面积(AUC)大于其单独指标的AUC(P<0.05)。结论结核性胸膜炎胸膜纤维化患者血清和胸腔积液PAI-1、TGF-β、VEGF、IL-6水平与疗效有关,血清及胸腔积液PAI-1、TGF-β、VEGF、IL-6联合检测的预测价值较好,能够为临床干预提供参考依据。

超声衰减参数联合血清PAI-1和ALT水平评估代谢相关脂肪性肝病患者肝脂肪变性程度的价值分析

目的分析超声衰减参数(UAP)联合血清纤溶酶原激活物抑制物1(PAI-1)和丙氨酸氨基转移酶(ALT)水平评估代谢相关性脂肪性肝病(MAFLD)患者肝脂肪变性程度的效能。方法2019年3月~2022年12月我院诊治的112例MAFLD患者均接受肝穿刺活检,所有受试者接受iLivTouch瞬时弹性成像检测UAP,采用ELISA法检测血清PAI-1水平,应用受试者工作特征(ROC)曲线分析UAP联合血清PAI-1和ALT水平评估MAFLD患者肝脂肪变性程度的效能。结果在112例MAFLD患者中,经肝组织病理学检查发现肝脂肪变1级(轻度)45例,2级(中度)42例和3级(重度)25例;重度肝脂肪变患者BMI、血清TC、TG和LDL-C水平分别为(32.6±2.4)kg/m^(2)、(6.6±0.9)mmol/L、(4.6±1.4)mmol/L和(4.0±0.9)mmol/L,显著高于中度患者【分别为(27.6±1.9)kg/m^(2)、(5.8±0.8)mmol/L、(3.5±0.9)mmol/L和(3.5±0.7)mmol/L,P<0.05】或轻度患者【分别为(24.1±0.9)kg/m^(2)、(5.1±0.7)mmol/L、(2.2±0.7)mmol/L和(3.0±0.5)mmol/L,P<0.05】,而血清HDL-C水平为(1.2±0.2)mmol/L,显著低于中度【(1.4±0.2)mmol/L,P<0.05】或轻度患者【(1.4±0.2)mmol/L,P<0.05】;重度组UAP、血清PAI-1和ALT水平分别为(312.7±32.6)dB/m、(36.5±4.2)mg/mL和(72.1±7.4)U/L,显著高于中度组【分别为(284.2±30.1)dB/m、(28.1±3.4)mg/mL和(36.3±4.1)U/L,P<0.05】或轻度组【分别为(257.4±26.4)dB/m、(20.4±2.4)mg/mL和(23.7±2.5)U/L,P<0.05】;ROC曲线分析显示,UAP联合血清PAI-1和ALT水平评估重度肝脂肪变性的曲线下面积(AUC)、特异度和敏感度分别为0.914(95%CI:0.883~0.990)、89.6%和93.3%,其特异度显著优于单一指标预测(P<0.05)。结论应用UAP联合血清PAI-1和ALT水平预测MAFLD患者严重肝脂肪变性有良好的评估价值,可为临床诊治提供参考依据。

预后营养指数及血清suPAR、TK1在晚期肝癌预后中的预测价值

目的探索预后营养指数(PNI)及血清可溶性尿激酶型纤溶酶原激活物受体(suPAR)、胸苷激酶1(TK1)在晚期肝癌表达意义以及在预后评估中预测的应用价值。方法选取2019年2月至2021年2月收集的92例晚期肝癌患者进行回顾性分析,均进行PNI评估及血清suPAR、TK1检测,比较两组PNI、suPAR、TK1水平。同时,根据患者是否死亡,分为预后不良组(n=28,死亡),预后良好组(n=64,生存),经多因素Cox回归模型分析影响晚期肝癌患者预后独立危险因素,经受试者操作特征(ROC)曲线分析PNI、suPAR、TK1的诊断价值。结果经单因素分析,血管侵犯、门静脉癌栓会对晚期肝癌预后造成影响(P<0.05),且预后不良组PNI低于预后良好组,suPAR、TK1水平高于预后良好组,差异有统计学意义。Kaplan-Meier生存分析显示,PNI高表达、suPAR低表达、TK1低表达、无血管侵犯、无门静脉癌栓者生存时间显著高于PNI低表达、suPAR高表达、TK1高表达、有血管侵犯、有门静脉癌栓者,差异有统计学意义(P<0.05);经多因素Cox回归模型分析,PNI低表达、suPAR高表达、TK1高表达是影响晚期肝癌患者预后的独立危险因素(P<0.05)。经ROC曲线分析,PNI、suPAR、TK1及3项联合诊断晚期肝癌预后的曲线下面积分别为0.818、0.827、0.801、0.957。结论晚期肝癌患者血清suPAR、TK1水平升高,PNI降低,PNI、suPAR、TK1可作为一项简捷而有效的指标,来协助评估晚期肝癌患者的病情严重程度及预后。

动态心电图及sST2、PAI-1在川崎病伴发冠脉损伤诊断中的研究

目的探讨动态心电图及可溶性人基质裂解素-2(sST2)、纤溶酶原激活物抑制物-1(PAI-1)在川崎病伴发冠脉损伤诊断中的意义。方法研究对象选取2018年1月至2024年1月郑州大学第一附属医院收治的102例川崎病患儿,根据患儿是否伴发冠脉损伤分为两组,其中损伤组40例,未损伤组62例。比较两组患儿的临床病例资料[性别、年龄、身体质量指数(BMI)、发热持续时间、白细胞计数、25-羟维生素D3(25-(OH)D_(3))、血红蛋白、血小板计数、肌酸激酶同工酶(CK-MB)、氨基末端脑利钠肽前体(NT-proBNP)、C反应蛋白(CRP)、sST2、PAI-1]及动态心电图异常率,通过多因素分析川崎病伴发冠脉损伤的影响因素,绘制ROC曲线评价不同指标对川崎病患儿伴发冠脉损伤的诊断价值。结果损伤组患儿的发热持续时间、血小板计数、CRP、CK-MB、NT-proBNP、sST2、PAI-1水平高于未损伤组,25-(OH)D_(3)水平低于未损伤组,差异具有统计学意义(P<0.05)。损伤组患儿的动态心电图异常率为60.00%,未损伤组患儿的动态心电图异常率为16.13%,损伤组高于未损伤组,差异具有统计学意义(P<0.05)。二元Logistic分析结果显示,发热持续时间、25-(OH)D_(3)、血小板计数、CRP、CK-MB、NT-proBNP、sST2、PAI-1、动态心电图异常是川崎病患儿伴发冠脉损伤的影响因素(P<0.05)。以sST2、PAI-1、动态心电图异常及3项指标联合应用作为变量绘制诊断川崎病伴发冠脉损伤的ROC曲线,sST2的AUC为0.789,PAI-1的AUC为0.729,动态心电图异常的AUC为0.719,联合检测的AUC为0.978。结论动态心电图及sST2、PAI-1水平诊断川崎病是否伴发CAL具有较高的诊断价值。

Diagnostic Value of the Padua Score Combined with Thrombotic Biomarker Tissue Plasminogen Activator Inhibitor-1 (tPAI-1) Detection for the Risk of Deep Vein Thrombosis in Patients with Pulmonary Heart Disease

This study explores the diagnostic value of combining the Padua score with the thrombotic biomarker tissue plasminogen activator inhibitor-1(tPAI-1)for assessing the risk of deep vein thrombosis(DVT)in patients with pulmonary heart disease.These patients often exhibit symptoms similar to venous thrombosis,such as dyspnea and bilateral lower limb swelling,complicating differential diagnosis.The Padua Prediction Score assesses the risk of venous thromboembolism(VTE)in hospitalized patients,while tPAI-1,a key fibrinolytic system inhibitor,indicates a hypercoagulable state.Clinical data from hospitalized patients with cor pulmonale were retrospectively analyzed.ROC curves compared the diagnostic value of the Padua score,tPAI-1 levels,and their combined model for predicting DVT risk.Results showed that tPAI-1 levels were significantly higher in DVT patients compared to non-DVT patients.The Padua score demonstrated a sensitivity of 82.61%and a specificity of 55.26%at a cutoff value of 3.The combined model had a significantly higher AUC than the Padua score alone,indicating better discriminatory ability in diagnosing DVT risk.The combination of the Padua score and tPAI-1 detection significantly improves the accuracy of diagnosing DVT risk in patients with pulmonary heart disease,reducing missed and incorrect diagnoses.This study provides a comprehensive assessment tool for clinicians,enhancing the diagnosis and treatment of patients with cor pulmonale complicated by DVT.Future research should validate these findings in larger samples and explore additional thrombotic biomarkers to optimize the predictive model.

Tissue-type plasminogen activator is a homeostatic regulator of synaptic function in the central nervous system

Membrane depolarization induces the release of the serine proteinase tissue-type plasminogen activator（t PA） from the presynaptic terminal of cerebral cortical neurons.Once in the synaptic cleft this t PA promotes the exocytosis and subsequent endocytic retrieval of glutamate-containing synaptic vesicles,and regulates the postsynaptic response to the presynaptic release of glutamate.Indeed,t PA has a bidirectional effect on the composition of the postsynaptic density（PSD） that does not require plasmin generation or the presynaptic release of glutamate,but varies according to the baseline level of neuronal activity.Hence,in inactive neurons t PA induces phosphorylation and accumulation in the PSD of the Ca^（2＋）/calmodulin-dependent protein kinase IIα（pCa MKIIα）,followed by pCa MKIIα-induced phosphorylation and synaptic recruitment of Glu R1-containing α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid（AMPA） receptors.In contrast,in active neurons with increased levels of pCa MKIIα in the PSD t PA induces pCa MKIIα and p Glu R1 dephosphorylation and their subsequent removal from the PSD.These effects require active synaptic N-methyl-D-aspartate（NMDA） receptors and cyclin-dependent kinase 5（Cdk5）-induced phosphorylation of the protein phosphatase 1（PP1） at T320.These data indicate that t PA is a homeostatic regulator of the postsynaptic response of cerebral cortical neurons to the presynaptic release of glutamate via bidirectional regulation of the pCa MKIIα/PP1 switch in the PSD.

尤瑞克林治疗急性脑梗死对患者血清1型纤溶酶原激活物抑制剂水平及血小板参数的影响

目的探究尤瑞克林治疗急性脑梗死对患者血清1型纤溶酶原激活物抑制剂(PAI-1)水平及血小板参数的影响。方法回顾性分析2020年1月至2022年5月丰城市人民医院收治的82例急性脑梗死患者的临床资料,根据使用药物不同分为观察组(n=47)与对照组(n=35)。对照组采用阿司匹林联合氯吡格雷治疗,观察组在对照组基础上联合尤瑞克林治疗。比较两组临床疗效、美国国立卫生研究院卒中量表(NIHSS)、血清PAI-1、血小板计数(PLT)、血小板体积分布宽度(PDW)、血小板平均体积(MPV)、血小板压积(PCT)、血小板黏附率(PAdT)、血小板聚集率(PAgT)、全血黏度、血浆黏度、不良反应发生率。结果观察组治疗总有效率为89.36%,高于对照组的71.43%,差异有统计学意义(P<0.05)。治疗前、治疗7 d,两组NIHSS评分比较差异无统计学意义;治疗14 d,观察组NIHSS评分低于对照组,差异有统计学意义(P<0.05)。治疗14 d,两组血清PAI-1水平均低于治疗前,且观察组低于对照组,差异有统计学意义(P<0.05)。治疗14 d,两组PLT均高于治疗前,PDW均窄于治疗前,MPV、PCT均小于治疗前,PAdT、PagT均低于治疗前,且观察组PLT高于对照组,PDW窄于对照组,MPV、PCT均小于对照组,PAdT、PagT均低于对照组,差异有统计学意义(P<0.05)。治疗14 d,两组全血黏度、血浆黏度均低于治疗前,且观察组低于对照组,差异有统计学意义(P<0.05)。两组不良反应发生率比较差异无统计学意义。结论尤瑞克林治疗急性脑梗死效果显著,可降低患者血清PAI-1水平及全血黏度、血浆黏度,改善血小板参数,值得临床推广应用。

Crystal Structures of 2-Aminobenzothiazole-based Inhibitors in Complexes with Urokinase-type Plasminogen Activator

Urokinase-type plasminogen activator （uPA） plays a crucial role in the regulation of plasminogen activation, tumor cell adhesion and migration. The inhibition of uPA activity is a promising mechanism for anti-cancer therapy. Most current uPA inhibitors employ a highly basic group （either amidine or guanidine group） to target the S1 pocket of uPA active site, which leads to poor oral bioavailability. Here we study the possibility of using less basic 2-aminobenzothiazole （ABT） as S1 pocket binding group. We report the crystal structures of uPA complexes with ABT or 2-amino-benzothiazole-6-carboxylic acid ethyl ester （ABTCE）. The inhibitory constants of these two inhibitors were measured by a chromogenic competitive assay, and it was found that ABTCE is a better inhibitor for uPA （Ki = 656 μM） than ABT （Ki = 5.03 mM）. This work shows that 2-amniobenzothiazole can be used as P1 group which may have better oral bioavailability than the commonly used amidine or guanidine group. We also found the ethyl ester group occupies the characteristic oxyanion hole and contacts to uPA 37- and 60-loops. Such work provides structural information for further improvements of potency and selectivity of this new class of uPA inhibitor.

血清MIF、MCP-1、suPAR水平与脓毒症严重程度及合并ARDS风险的关系

目的探讨血清巨噬细胞迁移抑制因子(MIF)、单核细胞趋化蛋白-1(MCP-1)、可溶性尿激酶型纤溶酶原激活物受体(suPAR)水平与脓毒症严重程度及合并急性呼吸窘迫综合征(ARDS)风险的关系。方法回顾性分析2022年2月至2023年5月太原钢铁(集团)有限公司总医院收治的86例脓毒症患者的临床资料。依据病情程度不同将患者分为脓毒症组(n=20)、严重脓毒症组(n=48)和脓毒症休克组(n=18)。入院72 h内参考ARDS诊断标准将患者分为ARDS组(n=27)和非ARDS组(n=59)。检测并比较各组脓毒症患者血清MIF、MCP-1、suPAR水平。收集ARDS组与非ARDS组患者年龄、性别、体重指数、合并症、感染类型、既往史、心率、急性生理学和慢性健康状况评价Ⅱ(APACHEⅡ)、脓毒症相关性器官衰竭评价(SOFA)评分、白细胞计数、血乳酸、天冬氨酸转移酶(AST)、丙氨酸转移酶(ALT)、总胆固醇等指标。采用多因素Logistic回归分析对影响脓毒症患者并发ARDS的危险因素进行分析。通过受试者工作特征(ROC)曲线分析血清MIF、MCP-1、suPAR水平预测脓毒症患者并发ARDS的价值。结果脓毒症休克组患者血清MIF、MCP-1、suPAR水平分别为(94.02±10.13)、(506.55±45.15)、(13.89±3.95)ng/mL,均高于脓毒症组[(76.93±7.01)、(148.38±35.74)、(6.07±2.13)ng/mL]和严重脓毒症组[(85.46±8.74)、(327.08±40.62)、(8.42±1.07)ng/mL],而严重脓毒症组患者血清MIF、MCP-1、suPAR水平均高于脓毒症组,差异均有统计学意义(P<0.05)。ARDS组与非ARDS组患者的年龄、性别构成比、体重指数、合并症、感染类型、白细胞计数、心率、吸烟史、饮酒史、血乳酸、AST、ALT、总胆固醇比较,差异均无统计学意义(P>0.05);ARDS组患者APACHEⅡ评分、SOFA评分、有急腹症和胰腺炎占比及血清MIF、MCP-1、suPAR水平均高于非ARDS组,差异均有统计学意义(P<0.05)。经多因素Logistic回归分析结果显示,急腹症、胰腺炎、APACHEⅡ评分、SOFA评分、MIF、MCP-1、suPAR是影响脓毒症患者并发ARDS的独立危险因素(P<0.05)。经ROC曲线分析结果显示,血清MIF、MCP-1、suPAR水平均能预测脓毒症患者ARDS的发生,曲线下面积分别为0.904、0.910、0.917,预测价值较好(P<0.05)。结论血清MIF、MCP-1、suPAR水平与脓毒症患者病情程度、并发ARDS密切相关,且血清MIF、MCP-1、suPAR水平对ARDS的发生有较好的预测价值。

脓毒症合并心肌损伤患者血清t-PAI-C、HBP、HMGB1水平与预后的关系研究

目的 探究脓毒症合并心肌损伤患者血清组织纤溶酶原激活物-纤溶酶原激活物抑剂-1复合物(t-PAI-C)、肝素结合蛋白(HBP)、外周血高迁移率组蛋白B1(HMGB1)水平与其预后的关系。方法 回顾性分析2020年3月至2023年3月蚌埠医学院第一附属医院收治的105例脓毒症合并心肌损伤患者的临床资料,依据患者治疗后28 d存活情况将其分为存活组与死亡组。比较两组临床资料(性别、年龄、体重指数、感染部位、平均动脉压、射血分数)、血清心肌肌钙蛋白I(cTnI)、t-PAI-C、HBP、HMGB1水平以及急性生理学和慢性健康状况评价Ⅱ(APACHEⅡ)评分,分析影响脓毒症合并心肌损伤患者预后的影响因素;探究t-PAI-C、HBP、HMGB1水平与cTnI、APACHEⅡ评分的相关性;绘制受试者工作特征(ROC)曲线分析t-PAI-C、HBP、HMGB1诊断脓毒症合并心肌损伤患者预后的价值。结果 脓毒症合并心肌损伤患者随访期间出现死亡30例(28.57%),存活75例(71.43%)。死亡组患者的cTnI、t-PAI-C、HBP、HMGB1水平以及APACHEⅡ评分分别为(1.58±0.43)μg/L、(16.75±4.00)ng/mL、(45.68±9.25)ng/mL、(125.00±20.18)μg/L、(17.63±2.66)分,均高于存活组[(0.65±0.11)μg/L、(13.20±2.68)ng/mL、(38.00±8.63)ng/mL、(96.69±11.25)μg/L、(11.50±1.68)分],差异均有统计学意义(P<0.05)。cTnI、t-PAI-C、HBP、HMGB1以及APACHEⅡ评分均为影响脓毒症合并心肌损伤患者预后的独立危险因素(P<0.05)。t-PAI-C、HBP、HMGB1与cTnI、APACHEⅡ评分之间均呈正相关(P<0.05)。t-PAI-C、HBP、HMGB1三者联合诊断脓毒症合并心肌损伤患者预后的曲线下面积(AUC)为0.950(0.889~0.983),敏感度与特异度分别为83.33%和93.33%,诊断效能均优于单一的t-PAI-C、HBP、HMGB1指标(P<0.05)。结论 t-PAI-C、HBP、HMGB1水平与cTnI、APACHEⅡ评分相关性较好,可作为临床诊断脓毒症合并心肌损伤的潜在生物学标记物,三者联合预测脓毒症合并心肌损伤患者预后效能较好。

股骨颈骨折内固定术后血清学指标PAI-1作为股骨头坏死并发症风险因素的探究

目的 探究股骨颈骨折内固定术后股骨头坏死的风险因素,明确血清学指标纤溶酶原激活物抑制剂-1(PAI-1)对股骨头坏死的预测价值。方法 纳入该院2021年1月至2022年1月收治的股骨颈骨折内固定术患者95例。获取患者相关临床信息,并检测患者术前,术后1、2和3 d血清PAI-1水平;术后随访1年时间,根据患者是否发生股骨头坏死将患者分为坏死组和无坏死组;在术后1年收集所有患者视觉模拟评分(VAS)、西安大略麦克马斯特大学骨关节炎指数(WOMAC)和Harris髋关节评分(HHS)情况;比较坏死组和无坏死组患者的临床信息和术前、术后血清PAI-1水平差异,明确股骨头坏死的相关风险因素并进行Logistic回归分析;探究术后血清PAI-1水平与患者VAS、WOMAC和HHS之间的关系;绘制血清PAI-1作为股骨头坏死预测指标的受试者工作特征(ROC)曲线,明确其预测价值。结果 坏死组和无坏死组Garden分型、复位质量比较差异有统计学意义(P<0.05),坏死组术后1、2 d血清PAI-1水平均高于无坏死组(P<0.05);患者术后1、2 d血清PAI-1水平与VAS和WOMAC呈正相关(P<0.05),与HHS呈负相关(P<0.05);Logistic回归分析结果显示,术后1、2 d血清PAI-1水平升高是股骨头坏死的危险因素(P<0.05);ROC曲线结果显示,术后2 d血清PAI-1水平相较于术后1 d血清PAI-1水平预测价值更高,术后2 d血清PAI-1水平预测股骨头坏死的最佳截断值为44.8 ng/L,灵敏度为68.49%,特异度为86.36%,曲线下面积(AUC)为0.807。结论 股骨颈骨折内固定术后1、2 d血清PAI-1水平可用于预测术后股骨头坏死的发生,尤其是术后2 d血清PAI-1水平。

血浆纤溶酶原激活剂抑制物-1联合C反应蛋白与白蛋白比值对老年脓毒症患者28天预后的评估价值

目的 探讨纤溶酶原激活剂抑制物-1(PAI-1)联合C反应蛋白与白蛋白比值(CAR)对老年脓毒症患者28 d预后的预测价值。方法 90例老年脓毒症患者作为研究组,30名同期老年体检健康者作为对照组;比较研究组入院次日、对照组体检当日的血浆PAI-1水平和CAR,记录研究组的白细胞计数、血小板计数及淋巴细胞计数,计算序贯器官衰竭评分(SOFA)和急性生理学与慢性健康状况评分Ⅱ(APACHEⅡ);分析老年脓毒症患者血浆PAI-1水平和CAR与病情严重程度的相关性,不同预后(根据患者28 d的生存结局分为生存组和死亡组)老年脓毒症患者一般资料、实验室指标及血浆PAI-1水平和CAR,采用多因素logistic回归分析影响老年脓毒症患者28 d预后的独立危险因素,采用受试者工作特征(ROC)曲线下面积(AUC)评价血浆PAI-1、CAR对老年脓毒症患者入院28 d预后的预测价值。结果 研究组血浆PAI-1水平和CAR均高于对照组,差异有统计学意义(P<0.05);老年脓毒症患者血浆PAI-1、CAR与SOFA评分、APACHEⅡ评分分别呈正相关关系(P<0.05);28天内,老年脓毒症患者死亡31例(34.44%)、存活59例(65.56%),生存组的淋巴细胞计数高于死亡组,SOFA评分、血浆PAI-1水平及CAR低于死亡组(P<0.05);多因素logistic回归分析结果表明血浆PAI-1水平和CAR是影响老年脓毒症患者28 d预后的独立危险因素(P<0.05),ROC曲线分析结果显示,血浆PAI-1、CAR及两者联合预测老年脓毒症患者28 d内死亡的AUC分别为0.752(95%CI为0.642~0.862,P<0.001),0.842(95%CI为0.745~0.939,P<0.001)及0.887(95%CI为0.796~0.977,P<0.001)。结论 老年脓毒症患者的血浆PAI-1水平和CAR升高,两者联合对患者28 d预后具有较好的预测价值。