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. 1995 Oct 11;23(19):3887–3893. doi: 10.1093/nar/23.19.3887

Inhibition of NF-kappa B-Rel A expression by antisense oligodeoxynucleotides suppresses synthesis of urokinase-type plasminogen activator (uPA) but not its inhibitor PAI-1.

U Reuning 1, O Wilhelm 1, T Nishiguchi 1, L Guerrini 1, F Blasi 1, H Graeff 1, M Schmitt 1
PMCID: PMC307306  PMID: 7479032

Abstract

The essential role of urokinase-type plasminogen activator (uPA) in tumor invasion and metastasis stresses the necessity of a fine-tuned cellular control over its expression. It has been shown that changes in uPA directly correlate with changes in cell invasiveness. We examined the role of Rel-related proteins in uPA synthesis by human ovarian cancer cells by inhibiting their expression using the antisense (AS) oligodeoxynucleotide (ODN) technology. Exposure of OV-MZ-6 cells to 10 microM phosphorothioate (PS)-derivatized AS-ODN directed to Rel A led to a maximal 50% decrease of uPA antigen in cell lysates and a 70% reduction in cell cultures supernatants accompanied by a significant transient decline in uPA mRNA levels. Antisense-PS-ODN directed to NF-kappa B1 (p50) or c-rel had no effect on uPA protein expression. AS-PS-ODN directed to Rel A also affected the proteolytic capacity of OV-MZ-6 cells reflected by an approximately 70% decrease in the fibrinolytic capacity of the cells within 24 h compared to untreated controls. AS-PS-ODN directed to I kappa B alpha expression increased uPA in cell culture supernatants up to 50%. uPA receptor (uPAR) production and synthesis of plasminogen activator inhibitor type-1 (PAI-1) were not altered by either AS-PS-ODN applied. Western blot and gel retardation analyses revealed constitutive expression of Rel-related proteins in nuclear protein extracts of OV-MZ-6 cells. Thus these proteins seem to be implicated in uPA regulation and may thereby contribute to tumor spread and metastasis.

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Selected References

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