Overexpression of urokinase-type plasminogen activator in pancreatic adenocarcinoma is regulated by constitutively activated RelA.

Abstract:

:The Rel/NF-kappaB transcription factors regulate the expression of many genes. The activity of RelA, a member of the Rel/NF-kappaB transcription factor family, is constitutively activated in the majority of pancreatic adenocarcinomas and cell lines. We report that the urokinase-type plasminogen activator (uPA), one of the critical proteases involved in tumor invasion and metastasis, is overexpressed in pancreatic tumor cells and its overexpression is induced by constitutive RelA activity. The uPA promoter contains an NF-kappaB binding site that directly mediates the induction of uPA expression by RelA. Expression of a dominant-negative IkappaBalpha mutant inhibits kappaB site-dependent transcriptional activation of a uPA promoter-CAT reporter gene. Treating the pancreatic tumor cell lines with the known NF-kappaB inhibitors, dexamethasone and n-tosylphenyalanine chloromethyl ketone (TPCK), abolishes constitutive RelA activity and uPA overexpression. These results show that uPA is one of the downstream target genes induced by constitutively activated RelA in human pancreatic tumor cells, and suggests that constitutive RelA activity may play a critical role in tumor invasion and metastasis. Inhibition of constitutive RelA in pancreatic tumor cells may reduce their invasive and metastatic potential.

journal_name

Oncogene

journal_title

Oncogene

authors

Wang W,Abbruzzese JL,Evans DB,Chiao PJ

doi

10.1038/sj.onc.1202833

subject

Has Abstract

pub_date

1999-08-12 00:00:00

pages

4554-63

issue

32

eissn

0950-9232

issn

1476-5594

journal_volume

18

pub_type

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