尿激酶型纤溶酶原激活剂在小鼠皮肤创伤修复中的作用

观察uPA在小鼠皮肤创伤修复中的作用,以及外源性应用uPA对损伤表皮创伤修复的超微结构变化。在创伤部位外源性应用uPA后,利用光镜及扫描电镜等方法,比较观察了不同时间及浓度的uPA对损伤表皮组织修复,尤其是基底细胞迁移的影响,结果发现uPA浓度为100μg/mL及200μg/mL时,与对照组比较,基底细胞提前发生迁移,较对照组早1h。创伤部位外源性应用uPA,有利于表皮基底细胞的迁移,这种促进细胞迁移作用可能对于治疗皮肤创伤早期愈合有重要影响。     

AP-1及其相关基因uPA、uPAR在肺癌中的表达及其意义

研究AP-1及其相关基因uPA、uPAR在人肺癌中的表达及其与肺癌临床病理特征的关系.通过免疫组织化学方法检测101例肺癌组织及7例正常肺组织中AP-1、uPA、uPAR的表达情况,利用CMIAS2000型多功能真彩病理图像分析系统测量计算各病例中c-jun、c-fos、uPA、uPAR蛋白阳性细胞的平均光密度(DAO)和积分光密度(DIO).c-jun、c-fos在肺癌组织中表达的阳性率及其共表达率均显著高于正常肺组织;二者在NSCLC的表达显著强于SCLC;不同组织学类型肺癌中二者表达具有显著性差异,腺癌中表达最强,小细胞肺癌中表达最弱;c-jun、c-fos与肺癌分级、合并分期、淋巴结转移均呈显著正相关.uPA、uPAR与肺癌淋巴结转移密切相关,与合并分期呈显著正相关;uPAR与肺癌分级呈显著正相关;各指标之间均存在显著正相关关系.研究结果表明uPA、uPAR参与了肺癌侵袭转移,AP-1信号传导通路在该过程中起了重要调节作用.     

Regulation and interactions in the activation of cell-associated plasminogen

The main components in plasminogen activation include plasminogen, tissue plasminogen activator (tPA), urokinase plasminogen activator (uPA), urokinase plasminogen activator receptor (uPAR), and plasminogen activator inhibitors-1 and –2 (PAI-1, PAI-2). These components are subject to extensive regulation and interactions with for example, pericellular adhesion molecules. Although uPA and tPA are quite similar in structure and have common inhibitors and physiological substrates, their physiological roles are distinct. Traditionally, the role of tPA has been in fibrinolysis and that of uPA in cell migration, especially in cancer cells. Recently several targets for tPA/plasmin have been found in neuronal tissues. The functional role of the PAIs is no longer simply to inhibit overexpressed plasminogen activators, and PAI-2 has an unidentified role in the regulation of cell death.Received 2 June 2004; received after revision 30 June 2004; accepted 20 July 2004     

骨关节炎滑膜uPA、uPAR、PAI-1表达及意义

探讨尿激酶型纤溶酶原激活物(uPA)及其受体(uPAR)和其抑制剂(PAI-1)在OA的发生发展中的意义。方法:采用免疫组化方法检测OA滑膜组织中uPA,uPAR,PAI-1的表达。结果显示:36例OA滑膜中阳性表达uPA 29例(80.56%)、uPAR 25例(69.44%)P、AI-1 27例(75.00%)。21例对照滑膜中阳性表达uPA 6例(28.57%)、uPAR 6例(28.57%)、PAI-1 3例(14.29%)。实验组与对照组间3种蛋白表达差异均有统计学意义(P<0.05);再将实验组按年龄及软骨破坏程度分组,按年龄分组3种蛋白表达差异均无统计学意义(P>0.05);按软骨破坏程度分组3种蛋白表达差异均有统计学意义(P<0.05)。阳性表达主要分布在滑膜衬里层细胞。结论:uPA系统可能参与介导软骨降解、促进OA的发生发展;而PAI-1则通过抑制uPA活性延缓OA的发生发展。