Plasminogen activator inhibitor-1 inhibits prostate tumor growth through endothelial apoptosis.

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 Ther

authors

Chen SC,Henry DO,Reczek PR,Wong MK

doi

10.1158/1535-7163.MCT-08-0051

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

1227-36

issue

5

eissn

1535-7163

issn

1538-8514

pii

7/5/1227

journal_volume

7

pub_type

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