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pubmed-article:8164058pubmed:abstractTextConsiderable interest in the roles of serine proteases and serine protease inhibitors (serpins) in regulating physiologic and pathologic tissue remodeling has led to studies that indicate their critical participation in development and diseases of the brain. Plasminogen activator inhibitor-1 (PAI-1) is the most significant regulator of fibrinolysis in plasma, but little is known of the levels or activities of this important serpin in normal brain and brain tumors. For this reason, we estimated qualitative and quantitative levels of PAI-1 in normal human brain and various brain tumors. Western-blot results indicated that a 51 kDa band recognized with polyclonal anti-PAI-1 was more prominently in metastatic and glioblastoma than in meningiomas and low-grade gliomas; normal human brain lacked any detectable band. Reverse zymography also showed high levels of PAI-1 in malignant brain tumors. The complex formation with 125I-urokinase demonstrated that PAI-1 complex levels were increased in metastatic and glioblastoma when compared with low-grade gliomas and meningiomas. Since PAI-1 acts as a modulator of fibrinolysis, a better understanding of the balance between serine proteases and PAI-1 is likely to enhance our knowledge of brain tumor biology.lld:pubmed
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pubmed-article:8164058pubmed:authorpubmed-author:MorantzR ARAlld:pubmed
pubmed-article:8164058pubmed:authorpubmed-author:FestoffB WBWlld:pubmed
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pubmed-article:8164058pubmed:authorpubmed-author:RayJ MJMlld:pubmed
pubmed-article:8164058pubmed:authorpubmed-author:RayfordAAlld:pubmed
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pubmed-article:8164058pubmed:volume17lld:pubmed
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pubmed-article:8164058pubmed:pagination215-21lld:pubmed
pubmed-article:8164058pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:8164058pubmed:year1993lld:pubmed
pubmed-article:8164058pubmed:articleTitleIncreased levels of plasminogen activator inhibitor-1 (PAI-1) in human brain tumors.lld:pubmed
pubmed-article:8164058pubmed:affiliationDepartment of Neurosurgery, University of Texas M.D. Anderson Cancer Center, Houston 77030.lld:pubmed
pubmed-article:8164058pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8164058pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
pubmed-article:8164058pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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