Regulation of a promoter of the fibroblast growth factor 1 gene in prostate and breast cancer cells

J Steroid Biochem Mol Biol. 1998 Aug;66(3):93-103. doi: 10.1016/s0960-0760(98)00051-x.


FGF-1 mRNA is expressed in the prostate cancer cell lines LNCaP and PC-3 and in the breast carcinoma cell line MDA-MB-231. Levels of FGF-1 mRNA have been shown to be up-regulated by serum, phorbol esters, and combinations of growth factors. It was shown that the major FGF-1 mRNA species expressed following serum stimulation in MDA-MB-231 cells is FGF-1.C. To better understand the potential role of FGF-1 in human prostate and breast cancer, we began an analysis of the cis- and trans-acting elements of one of its promoters required for the serum, PMA, and androgen regulation in breast and prostate cancer cell lines. We show that FGF-1.C steady-state mRNA levels are increased following serum or PMA stimulation of PC-3 cells. Further, we determine the FGF-1.C transcription start site in PC-3 cells. By sequence analysis, we show that consensus AP1, AP2, and Sp1 sites and ARE- and CRE-near consensus elements are present in the immediate 5' region of the FGF-1.C transcription start site. Gel-shift assays show that oligonucleotides containing FGF-1.C AP1, AP2, or Spl sequences form specific DNA-protein complexes with nuclear extracts from PC-3 cells. To determine if these or other cis-acting sequences are responsible for the serum, androgen, or growth factor regulation of FGF-1 expression, fragments of the FGF-1.C promoter region were cloned upstream of the luciferase reporter gene. We show that FGF-1 synergizes with androgen to enhance FGF-1.C transcription in LNCaP cells. We further show that the DNA fragment containing sequence up to 1614 nucleotides upstream of the FGF-1.C transcription start site is sufficient for stimulating promoter activity following serum treatment of MDA-MB-231 cells. Thus, FGF-1.C promoter contains sequences that are important for androgen or serum stimulation in prostate and breast cancer cells.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Androgens / pharmacology
  • Base Sequence
  • Blood
  • Breast Neoplasms / genetics*
  • Cell Line
  • Consensus Sequence
  • DNA, Complementary / chemistry
  • Fibroblast Growth Factor 1 / genetics*
  • Gene Expression Regulation, Neoplastic* / drug effects
  • Humans
  • Male
  • Molecular Sequence Data
  • Promoter Regions, Genetic*
  • Prostatic Neoplasms / genetics*
  • RNA, Messenger / metabolism
  • Sequence Analysis
  • Tetradecanoylphorbol Acetate
  • Transcription, Genetic
  • Transfection
  • Tumor Cells, Cultured


  • Androgens
  • DNA, Complementary
  • RNA, Messenger
  • Fibroblast Growth Factor 1
  • Tetradecanoylphorbol Acetate