Cited by 270Prostate Cancer Treatment and ResearchEstrogen and related hormone effectsSperm and Testicular Function

Androgen-independent induction of prostate-specific antigen gene expression via cross-talk between the androgen receptor and protein kinase A signal transduction pathways.

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Sadar, Marianne D.·1999·Journal of Biological Chemistry

Abstract

Transcription of the prostate-specific antigen (PSA) gene escapes regulation by androgens in advanced prostate cancer. To determine the molecular mechanism(s) of androgen-independent regulation of the PSA gene, the possibility that the androgen receptor (AR) is activated in the absence of androgen by stimulation of protein kinase A (PKA) was investigated. Activation of PKA by forskolin resulted in elevated expression of the PSA gene in androgen-depleted LNCaP cells, an effect that was blocked by the antiandrogen, bicalutamide. Further evidence that induction of PSA gene expression was dependent on AR was obtained from experiments using PC3 cells devoid of AR. Neither PSA, PB, nor ARR3 androgen-responsive reporters could be induced by activation of PKA in the absence of transfected AR. In addition, when nuclear AR from forskolin-treated LNCaP cells was incubated with oligonucleotides encoding an androgen response element of the PSA promoter and examined by electromobility shift assay, an increase in AR-androgen response element complex formation was observed. Lastly, cotransfection of an expression vector for a chimeric protein encoding the amino-terminal domain of the human AR linked to Gal4 and a 5xGal4UAS reporter gene construct resulted in activation of the amino-terminal domain of the AR by stimulation of PKA activity. These results demonstrate androgen-independent induction of PSA gene expression in prostate cancer cells by an AR-dependent pathway.

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Crossref · 10.1074/jbc.274.12.7777

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  • When prostate cancer cells are treated with forskolin, AR-driven transcription is increased from AR-responsive promoters, an effect quenched by the addition of AR antagonists bicalutamide and flutamide.

    “When prostate cancer cells are treated with the inhibitor forskolin (a naturally derived molecule that activates adenylyl cyclase, thus increasing the intracellular levels of cAMP and consequently protein kinase A), AR-driven transcription is increased from ARresponsive promoters, an effect that is quenched by the addition of AR antagonists bicalutamide and flutamide (55,56).”

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Authors
Sadar, M. D.
Affiliations
BC Cancer Agency (CA)
Corresponding author
Sadar, Marianne D.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1999-03
Volume
274
Issue
12
Pages
7777-7783
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2043236550
Cited by
270
References
46
Citations by year
2024: 3 · 2023: 4 · 2022: 3 · 2021: 3 · 2020: 4 · 2019: 7 · 2018: 4 · 2017: 5 · 2016: 8 · 2015: 4 · 2014: 2 · 2013: 10 · 2012: 10
FWCI
19.80
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5p50dk047656-07)
  • National Institute of Diabetes and Digestive and Kidney Diseases (P50 DK47656)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Prostate Cancer Treatment and Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Estrogen and related hormone effects
  • Health Sciences › Medicine › Reproductive Medicine › Sperm and Testicular Function
Keywords
prostate-specific antigen, androgen receptor, protein kinase A, prostate cancer, forskolin, bicalutamide, androgen response element, LNCaP cells, PC-3 cells, transcriptional activation
MeSH terms
Androgen Antagonists, Androgens, Anilides, Colforsin, Humans, Nitriles, Receptors, Androgen, RNA, Messenger, Tosyl Compounds, Tumor Cells, Cultured, Signal Transduction, Gene Expression Regulation, Neoplastic, Prostate-Specific Antigen, Cyclic AMP-Dependent Protein Kinases

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