Back to Search
Start Over
HOXC8 inhibits androgen receptor signaling in human prostate cancer cells by inhibiting SRC-3 recruitment to direct androgen target genes.
- Source :
-
Molecular cancer research : MCR [Mol Cancer Res] 2010 Dec; Vol. 8 (12), pp. 1643-55. Date of Electronic Publication: 2010 Nov 02. - Publication Year :
- 2010
-
Abstract
- HOX (homeobox) genes encode homeodomain-containing transcription factors critical to development, differentiation, and homeostasis. Their dysregulation has been implicated in a variety of cancers. Previously, we showed that a subset of genes of the HOXC cluster is upregulated in primary prostate tumors, lymph node metastases, and malignant prostate cell lines. In the present study, we show that HOXC8 inhibits androgen receptor (AR)-mediated gene induction in LNCaP prostate cancer cells and HPr-1 AR, a nontumorigenic prostate epithelial cell line. Mechanistically, HOXC8 blocks the AR-dependent recruitment of the steroid receptor coactivators steroid receptor coactivator-3 (SRC-3), and CREB binding protein to the androgen-regulated prostate-specific antigen gene enhancer and inhibits histone acetylation of androgen-regulated genes. Inhibition of androgen induction by HOXC8 is reversed upon expression of SRC-3, a member of the SRC/p160 steroid receptor cofactor family. Coimmunoprecipitation studies show that HOXC8 expression inhibits the hormone-dependent interaction of AR and SRC-3. Finally, HOXC8 expression increases invasion in HPr-1 AR nontumorigenic cells. These data suggest a complex role for HOXC8 in prostate cancer, promoting invasiveness while inhibiting AR-mediated gene induction at androgen response element-regulated genes associated with differentiated function of the prostate. A greater understanding of HOXC8 actions in the prostate and its interactions with androgen signaling pathways may elucidate mechanisms driving the onset and progression of prostate cancer.<br /> (©2010 AACR.)
- Subjects :
- Acetylation
Androgens genetics
CREB-Binding Protein antagonists & inhibitors
CREB-Binding Protein metabolism
Cell Line, Tumor
Cell Movement physiology
Enhancer Elements, Genetic
Epithelial Cells metabolism
Epithelial Cells pathology
Gene Expression Regulation, Neoplastic
Histones antagonists & inhibitors
Histones metabolism
Homeodomain Proteins antagonists & inhibitors
Humans
Male
Neoplasm Invasiveness
Nuclear Receptor Coactivator 3 biosynthesis
Nuclear Receptor Coactivator 3 genetics
Prostate-Specific Antigen genetics
Prostate-Specific Antigen metabolism
Prostatic Neoplasms pathology
Receptors, Androgen biosynthesis
Receptors, Androgen genetics
Signal Transduction genetics
Transcription, Genetic
Transfection
Homeodomain Proteins metabolism
Nuclear Receptor Coactivator 3 antagonists & inhibitors
Nuclear Receptor Coactivator 3 metabolism
Prostatic Neoplasms genetics
Prostatic Neoplasms metabolism
Receptors, Androgen metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1557-3125
- Volume :
- 8
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Molecular cancer research : MCR
- Publication Type :
- Academic Journal
- Accession number :
- 21047772
- Full Text :
- https://doi.org/10.1158/1541-7786.MCR-10-0111