Induction of AP-1 binding to intron 1 of SP-A1 and SP-A2 is implicated in the phorbol ester inhibition of human SP-A promoter activity

Russell R. Hoover, Jelena Pavlovic, Joanna Floros

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

A deletional analysis of the SP-A1 promoter in NCI-H441 cells was performed to identify potential cis-acting elements involved in phorbol ester-mediated repression of human SP-A transcription. The phorbol ester TPA reduced SP-A1 and SP-A2 promoter activity to approximately 35% to 45% compared to that of control cells. The inhibitory effect of TPA was significantly reduced upon removal of the region +64/+394 relative to the SP- A1 transcription start site. Using NCI-H441 nuclear proteins, electromobility shift assay analysis showed that the intron region +309/+329 of SP-A1 and the corresponding region of SP-A2 formed sequence-specific DNA/protein complexes that were induced by TPA exposure. The region +318/+324 of SP-A1 contains sequences similar to a consensus AP-1 binding site, TGACTGA (TCACTGA for SP- A2), which when mutated (TGAGAGT) prevented the formation of the TPA-induced DNA/protein complex. The TPA-induced complex was supershifted in the presence of antibody against the Fun family of proteins, but not the Fos family of proteins. These results suggest that the binding of AP-1 or an AP-1-like factor to the first intron of SP-A1 and SP-A2 may be involved in the phorbol ester inhibition of human SP-A gene expression.

Original languageEnglish (US)
Pages (from-to)303-317
Number of pages15
JournalExperimental Lung Research
Volume26
Issue number5
StatePublished - Jul 17 2000
Externally publishedYes

Keywords

  • Activator protein-1
  • Chloramphenicol acetyltransferase
  • Electromobility shift assay
  • Phorbol ester
  • Surfactant protein A
  • TPA-induced complex
  • Transcription

ASJC Scopus subject areas

  • Molecular Biology
  • Pulmonary and Respiratory Medicine
  • Clinical Biochemistry

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