Activation of alpha-fetoprotein synthesis in rat hepatoma cells with reduced sensitivity to dexamethasone

Anikó Venetianer, Anne Poliard, Maryse Poiret, Tamás Erdös, Edit Hermesz, José M. Sala-Trepat

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The Faza 967 ‘differentiated', dexamethasone (DEX)-sensitive cell line of Reuber rat hepatoma cells does not synthesize detectable amounts of alpha-fetoprotein (AFP), whereas it does produce albumin. AFP production was activated in ‘differentiated’ variants of Faza 967 cells with reduced glucocorticoid sensitivity upon culture for several months in the presence of high concentrations of dexamethasone. The stability of AFP production differed among the variants, while albumin synthesis did not change, thus indicating that the regulation of these two genes is not co-ordinated. Using molecular hybridization techniques, we found that the AFP message could not be detected in the non-AFP-producing cells, suggesting that the lack of AFP synthesis most probably originates from a tran-scriptional block of the AFP gene. AFP-producing and non-AFP-producing variants of Faza 967 cells constitute a valuable model system for studying the regulatory mechanisms involved in the activation and inactivation of the gene coding for the oncodevelopmental protein, AFP.

Original languageEnglish
Pages (from-to)148-156
Number of pages9
JournalDifferentiation
Volume32
Issue number2
DOIs
Publication statusPublished - Jan 1 1986

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology
  • Cancer Research

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