Aberrant expression of fibroblast growth factor receptor-1 in prostate epithelial cells allows induction of promatrilysin expression by fibroblast growth factors.

Abstract

Matrix metalloproteinases (MMPs) degrade extracellular matrix proteins, and there is evidence that they play a role in tumor cell growth, invasion and metastasis. Matrilysin (MMP-7) is over-expressed in prostate cancer cells and increases prostate cancer cell invasion. Prostate stromal fibroblasts secrete a factor(s), including fibroblast growth factor-1 (FGF-1), which induces promatrilysin expression in the prostate carcinoma cell line LNCaP but not in normal prostate epithelial cells (PrECs). Since FGF-1 is present in the prostate, an altered sensitivity to FGF-1 might explain the up-regulation of matrilysin expression in prostate cancer cells compared to normal prostate epithelium. FGF receptor-1 (FGFR-1) is not normally expressed by normal prostate epithelial cells; however, aberrant expression of this receptor has been reported in prostate cancer cells, including the LNCaP cell line. We hypothesized that aberrant expression of FGFR-1 in PrECs would render them sensitive to induction of promatrilysin expression by recombinant FGF-1. To test this hypothesis, we transiently transfected PrECs with an FGFR-1 expression vector, which resulted in over-expression of FGFR-1 protein in approximately 40% of cells. FGF-1 increased promatrilysin expression in FGFR-1-transfected PrECs 4-fold over mock-transfected cells, and this induction was inhibited by a specific FGFR-1 inhibitor, SU5402, and by co-expression of a dominant negative FGFR-1 protein. Our results demonstrate that aberrant FGFR-1 expression, an epigenetic phenomenon that has been associated with prostate cancer progression, allows induction of promatrilysin expression by FGF-1 in PrECs.

• Authors: T S Udayakumar, R D Klein, M S Maliner, R B Nagle, G T Bowden
• Journal: International journal of cancer (Int J Cancer) Vol. 91 Issue 2 Pg. 187-92 (Jan 15 2001) ISSN: 0020-7136 [Print] United States
• PMID: 11146443 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)
• Copyright: Copyright 2001 Wiley-Liss, Inc.

Chemical References

• Enzyme Precursors
• Pyrroles
• Receptors, Fibroblast Growth Factor
• SU 5402
• Fibroblast Growth Factors
• FGFR1 protein, human
• Receptor Protein-Tyrosine Kinases
• Receptor, Fibroblast Growth Factor, Type 1
• Metalloendopeptidases
• promatrilysin

Topics

• Dimerization
• Enzyme Precursors (biosynthesis)
• Epithelial Cells (chemistry)
• Fibroblast Growth Factors (pharmacology)
• Humans
• Male
• Metalloendopeptidases (biosynthesis)
• Prostate (chemistry)
• Pyrroles (pharmacology)
• Receptor Protein-Tyrosine Kinases (analysis, chemistry, physiology)
• Receptor, Fibroblast Growth Factor, Type 1
• Receptors, Fibroblast Growth Factor (analysis, chemistry, physiology)
• Transfection
• Tumor Cells, Cultured