NF-κB activation upregulates fibroblast growth factor 8 expression in prostate cancer cells

BACKGROUND Fibroblast growth factor 8 (FGF8) is over-expressed in prostate cancer (CaP) correlating with high-grade disease and reduced survival. The role of acetylation in transcriptional regulation of FGF8 was investigated using the histone deacetylase (HDAC) inhibitor Trichostatin A (TSA). METHODS FGF8 transcriptional response to TSA was investigated by gene reporter assays, RT-PCR, and Western blotting. Chromatin immunoprecipitation (ChIP) assays were also performed. RESULTS FGF8 is upregulated in response to TSA treatment along with NF-κB transcriptional activity. Over-expression of p65 activated FGF8 transcription. ChIP assays revealed p65 recruitment to the fgf8 promoter, containing putative NF-κB binding sites, post TSA stimulation. PI-3K activity is required for TSA mediated FGF8 upregulation. CONCLUSION Using TSA treatment in prostate cancer cells, a requirement of PI-3K activity in mediating TSA function is demonstrated and a novel role for NF-κB in the regulation of FGF8 expression is uncovered. Prostate © 2006 Wiley-Liss, Inc.