Cited by 50Prostate Cancer Treatment and ResearchEstrogen and related hormone effectsChromatin Remodeling and Cancer

Androgen Receptor Mutations in Carcinoma of the Prostate: Significance for Endocrine Therapy

Culig, Zoran, Klocker, Helmut, Bartsch, Georg, Hobisch, Alfred·2001·American Journal of PharmacoGenomics

Abstract

Endocrine therapy for advanced prostate cancer involves androgen ablation (orchiectomy or application of luteinizing hormone releasing hormone analogs) and/or blockade of the androgen receptor (AR) with either steroidal (cyproterone acetate) or nonsteroidal (hydroxyflutamide, bicalutamide and nilutamide) antiandrogens. These antagonists prevent androgen-induced conformational change and activation of the AR. During long term androgen ablation, the AR adapts to an environment with low androgen concentrations and becomes hypersensitive to low concentrations of androgens, either alone or in combination with various cellular regulators. Bicalutamide can switch from antagonist to agonist during long-term androgen withdrawal, as shown in prostate cancer LNCaP cells. AR point mutations were detected in metastatic lesions from human prostate cancer more frequently than in primary tumors. Although functional characterization of only some mutant AR detected in prostate cancer tissue has been performed, data available suggest that they are activated by dihydrotestosterone, its precursors and metabolites, synthetic androgens, estrogenic and progestagenic steroids and hydroxyflutamide. A direct association between AR mutations and endocrine withdrawal syndrome has been investigated in only one study thus far. There is no evidence at present that activation of any of the mutant AR genes detected in prostate cancer is enhanced in the presence of a nonsteroidal AR stimulator. Coactivators of the AR are proteins that associate with the receptor, possess histone acetylase activity and facilitate AR activation. The coregulatory proteins ARA70 and ARA160 differentially affected the activity of the mutated AR Glu(231)-->Gly, which was discovered in a mouse authochthonous prostate tumor. ARA70 enhanced receptor activation by both androgen and estradiol, whereas ARA160 augmented only androgen-induced AR activity. Novel experimental therapies that down-regulate AR expression have been developed; they include the application of ribozymes and antisense oligonucleotides.

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Crossref · 10.2165/00129785-200101040-00001

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Authors
Culig, Z., Klocker, H., Bartsch, G., & Hobisch, A.
Affiliations
Innsbruck Medical University (AT)
Venue
American Journal of PharmacoGenomics
Published
2001
Volume
1
Issue
4
Pages
241-249
ISSN
1175-2203 (ISSN-L)
OpenAlex
W2216139737
Cited by
50
References
96
Citations by year
2026: 1 · 2021: 2 · 2018: 2 · 2016: 3 · 2015: 3 · 2013: 3 · 2012: 4
FWCI
2.31
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of PharmacoGenomics (publishedVersion)
  • PubMed (publishedVersion)
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
Keywords
androgen receptor mutations, prostate cancer, androgen receptor antagonists, androgen withdrawal, endocrine therapy, bicalutamide, hydroxyflutamide, dihydrotestosterone, transcriptional coactivator, ribozymes, antisense oligonucleotides, metastatic prostate cancer
MeSH terms
Androgen Antagonists, Humans, Male, Mutation, Prostatic Neoplasms, Receptors, Androgen, Tumor Cells, Cultured, Point Mutation

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