Regulation of eicosanoid production and mitogenesis in rat intestinal epithelial cells by transforming growth factor-α and phorbol ester

Raymond N. DuBois, Joseph Awad, Jason Morrow, L. Jackson Roberts, Phyllis R. Bishop

Research output: Contribution to journalArticle

368 Scopus citations

Abstract

Growth factors and tumor promoters have been shown to play a role in intestinal epithelial growth regulation and transformation. In this study, transforming growth factor-α (TGFα) and the tumor promoter, tetradecanoyl phorbol acetate (TPA), are shown to stimulate the production of eicosanoids by rat intestinal epithelial (RIE-1) cells in culture. A 4.5-kb mRNA, which hybridizes to the mouse cyclooxygenase-2 cDNA probe, is elevated 18-fold within 30 min after TGFα or TPA treatment. Stimulation of RIE-1 cells with TGFα leads to the increase of a protein (M(r) ~ 69,000), which binds a monospecific antibody to the mouse cyclooxygenase-2 protein. Dexamethasone markedly inhibits the increase of the 4.5-kb mRNA. Pretreatment of TGFα or TPA-stimulated RIE-1 cells with dexamethasone or cyclooxygenase inhibitors prevents the increase in eicosanoid production by these cells. Treatment of quiescent RIE-1 cells with TGFα stimulates mitogenesis. This mitogenic activity is blocked by pretreating the cells with dexamethasone or cyclooxygenase inhibitors. A mitogen-inducible cyclooxygenase gene is thus shown to be regulated by TGFα and TPA in rat intestinal epithelial cells. We suggest that products of an intestinal growth factor-inducible cyclooxygenase may play a role in the regulation of mitogenesis.

Original languageEnglish (US)
Pages (from-to)493-498
Number of pages6
JournalJournal of Clinical Investigation
Volume93
Issue number2
DOIs
StatePublished - Feb 1994

Keywords

  • gene
  • growth
  • intestine
  • neoplasia
  • prostaglandins

ASJC Scopus subject areas

  • Medicine(all)

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