Identification and characterization of a cis-acting element that interferes with glucocorticoid-inducible activation of the mouse mammary tumor virus promoter

H. Tanaka, Y. Dong, Q. Li, S. Okret, J. A. Gustafsson

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The rat hepatoma cell line M1.19 is stably infected by the mouse mammary tumor virus (MMTV), and the expression of the virus is induced by glucocorticoid treatment. However, in the 6.10.2 variant of M1.19, an increase in MMTV transcription is hardly detectable upon exposure to hormone. The mechanism of hormone-unresponsiveness in these cells has been unclear. In this study, we show that nuclear extract from 6.10.2 cells contains a specific DNA-binding activity that recognizes a sequence motif extending from positions -163 to -147 on the MMTV promoter. An oligonucleotide probe spanning this region binds a nuclear factor distinct from the glucocorticoid receptor. In vivo competition experiments, where increased amounts of a plasmid containing this element were transfected into 6.10.2 cells, showed a dose-dependent increase in hormonal inducibility of MMTV expression. Together, these results indicate that this sequence motif negatively modulates glucocorticoid-inducible activation of the MMTV promoter. Moreover, we have characterized a nuclear factor that preferentially binds to the coding strand of this element.

Original languageEnglish (US)
Pages (from-to)5393-5397
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume88
Issue number12
DOIs
StatePublished - 1991

Keywords

  • Gene expression
  • Glucocorticoid receptor
  • Hormone resistance
  • Protein-protein interaction
  • Rat hepatoma cell

ASJC Scopus subject areas

  • General
  • Genetics

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