The Tohoku Journal of Experimental Medicine
Online ISSN : 1349-3329
Print ISSN : 0040-8727
ISSN-L : 0040-8727
Regular Contributions
Hypoxia Enhances the Expression of Plasminogen Activator Inhibitor-1 in Human Lung Cancer Cells, EBC-1
DAISUKE KIMURA, TADAATSU IMAIZUMI, WAKAKO TAMO, TAKEHIRO SAKAI, KAZUO ITO, RYO HATANAKA, HIDEMI YOSHIDA, TAKAO TSUSHIMA, KEI SATOH, IKUO FUKUDA
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Keywords: hypoxia, plasminogen activator inhibitor-1, hypoxia inducible factor-1α, lung cancer cell, MG132
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2002 Volume 196 Issue 4 Pages 259-267

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Abstract

Plasminogen activator inhibitor-1 (PAI-1) is one of the target genes of hypoxia inducible factor-1α (HIF-1α). Besides being an important physiological regulator of the fibrinolytic system PAI-1 is also involved in cancer invasiveness. HIF-1α is expressed in various types of pulmonary cells, but the relation of PAI-1 to HIF-1α under hypoxic condition in these cells are not fully elucidated. We, therefore, studied the effect of hypoxia on the expression of PAI-1 in a lung cancer cell line EBC-1. The expression of HIF-1α protein in EBC-1 cells was enhanced by hypoxia, and this was associated with increased secretion of PAI-1. Hypoxia did not affect the levels of HIF-1α mRNA but enhanced the PAI-1 mRNA. Pretreatment of the cells with MG132, which inhibits the proteasomal degradation of HIF-1α, increased the production of PAI-1 under both normoxia and hypoxia. We conclude that hypoxia induces PAI-1 expression, in EBC-1 cells, through the stabilization of HIF-1 complex and this may be related to cancer metastasis.

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