Abstract:
:Plasminogen activator inhibitor-1 (PAI-1) is an important endogenous inhibitor of urokinase-type plasminogen activator. Its action in tumor angiogenesis is complicated, varying with experimental setting and its cellular origin. To further understand the mechanism of the effect of PAI-1 on tumor angiogenesis, especially newly established tumor vasculature in early tumor progression, stable transfectants (TO-PAI-1) of the human prostate adenocarcinoma, PC3, were generated in which PAI-1 expression is under the control of the tetracycline-responsive promoter (Tet-On system). The TO-PAI-1 transfectants exhibit tight inducibility of expression of biologically active PAI-1 in vitro. Induction of PAI-1 expression in nude mice resulted in significant inhibition of tumor growth. This inhibition appears to be due to the effect of PAI-1 on angiogenesis, because it is manifested by an initial wave of tumor endothelial apoptosis accompanied by induction of tumor cell apoptosis and inhibition of tumor cell proliferation. Similar endothelial apoptosis is observed in vitro when human microvascular endothelial cells are physically cocultivated with TO-PAI-1 cells on vitronectin-coated plate. Taken together, these data show for the first time that PAI-1 induces endothelial apoptosis in the newly established tumor vasculature.
journal_name
Mol Cancer Therjournal_title
Molecular cancer therapeuticsauthors
Chen SC,Henry DO,Reczek PR,Wong MKdoi
10.1158/1535-7163.MCT-08-0051subject
Has Abstractpub_date
2008-05-01 00:00:00pages
1227-36issue
5eissn
1535-7163issn
1538-8514pii
7/5/1227journal_volume
7pub_type
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