Title
Activation of the DNA-dependent protein kinase stimulates nuclear export of the androgen receptor in vitro
UMMS Affiliation
Graduate School of Biomedical Sciences; Department of Cell Biology
Publication Date
2008-02-14
Document Type
Article
Disciplines
Life Sciences | Medicine and Health Sciences
Abstract
The androgen receptor undergoes nuclear import in response to ligand, but the mechanism by which it undergoes nuclear export is poorly understood. We developed a permeabilized cell assay to characterize nuclear export of the androgen receptor in LNCaP prostate cancer cells. We found that nuclear export of endogenous androgen receptor can be stimulated by short double-stranded DNA oligonucleotides. This androgen receptor export pathway is dependent on ATP hydrolysis and is enhanced by phosphatase inhibition with okadaic acid. Fluorescence recovery after photobleaching in permeabilized cells, under the conditions that stimulate androgen receptor export, suggested that double-stranded DNA-dependent export does not simply reflect the relief of a nuclear retention mechanism. A radiolabeled androgen was used to show that the androgen receptor remains ligand-bound during translocation through the nuclear pore complex. A specific inhibitor to the DNA-dependent protein kinase, NU7026, inhibits androgen receptor export and phosphorylation. In living cells, NU7026 treatment increases androgen-dependent transcription from endogenous genes that are regulated by androgen receptor. We suggest that DNA-dependent protein kinase phosphorylation of the androgen receptor, or an interacting component, helps target the androgen receptor for export from the nucleus.
DOI of Published Version
10.1074/jbc.M800810200
Source
J Biol Chem. 2008 Apr 18;283(16):10568-80. Epub 2008 Feb 12. Link to article on publisher's site
Journal/Book/Conference Title
The Journal of biological chemistry
Related Resources
PubMed ID
18270197
Repository Citation
Shank LC, Kelley JB, Gioeli DG, Yang C, Spencer A, Allison LA, Paschal BM. (2008). Activation of the DNA-dependent protein kinase stimulates nuclear export of the androgen receptor in vitro. GSBS Student Publications. https://doi.org/10.1074/jbc.M800810200. Retrieved from https://escholarship.umassmed.edu/gsbs_sp/1449