Plasminogen activator inhibitor type-2 (PAI-2) gene transcription requires a novel NF-kappaB-like transcriptional regulatory motif

Eur J Biochem. 1999 Aug;263(3):765-72. doi: 10.1046/j.1432-1327.1999.00552.x.

Abstract

Induction of human plasminogen activator inhibitor type-2 (PAI-2) gene transcription is the response of macrophages to inflammatory stimuli, such as the pleiotropic cytokine, tumour necrosis factor-alpha (TNFalpha). Here we have examined whether PAI-2 gene transcription in response to TNFalpha may be mediated through a regulatory pathway involving the transcription factor, NF-kappaB. We have tested the function of two potential NF-kappaB-like sites present in the PAI-2 proximal promoter for responsiveness to TNFalpha using chloramphenicol acetyl transferase reporter gene deletion and mutation analyses. While no evidence was found for TNFalpha regulation of the PAI-2 gene through either of these two sites, one of the NF-kappaB-like motifs, transcriptional regulatory motif (TRM), present at position -400 was found to be essential for constitutive PAI-2 transcription, as mutation of this motif abolished basal PAI-2 promoter activity in both monocyte-like U937 cells and HT1080 fibrosarcoma cells. Competition electrophoretic mobility shift assays identified four TRM-binding proteins present in U937, HT1080 and HeLa cell extracts, which bound to this motif but were not components of the NF-kappaB regulatory complex. Expression screening of a HeLa cell cDNA library using the -400 TRM as a probe identified two cDNAs encoding partial peptides which specifically bound the TRM motif. DNA sequence analysis revealed that one cDNA was novel, and the second cDNA encoded exon 5 of the nephroblastoma overexpressed (novH) proto-oncogene, suggesting a new role for this peptide in gene regulation. Taken together, these findings identify a new regulatory element required for constitutive PAI-2 transcription, and identify potential DNA-binding proteins associated with this element that may play a role in PAI-2 gene regulation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Chloramphenicol O-Acetyltransferase / genetics
  • Fibrosarcoma
  • Gene Expression Regulation* / drug effects
  • Genes, Reporter
  • HeLa Cells
  • Humans
  • Molecular Sequence Data
  • Mutagenesis
  • NF-kappa B / metabolism*
  • Plasminogen Activator Inhibitor 2 / genetics*
  • Promoter Regions, Genetic*
  • RNA, Messenger / genetics
  • Recombinant Fusion Proteins / biosynthesis
  • Regulatory Sequences, Nucleic Acid
  • Sequence Deletion
  • Transcription, Genetic* / drug effects
  • Tumor Cells, Cultured
  • Tumor Necrosis Factor-alpha / pharmacology
  • U937 Cells

Substances

  • NF-kappa B
  • Plasminogen Activator Inhibitor 2
  • RNA, Messenger
  • Recombinant Fusion Proteins
  • Tumor Necrosis Factor-alpha
  • Chloramphenicol O-Acetyltransferase

Associated data

  • GENBANK/AF144233