Androgen-induced Inhibition of Cell Proliferation in an Androgen-insensitive Prostate Cancer Cell Line (PC-3) Transfected with a Human Androgen Receptor Complementary DNA1

Shixing Yuan, Gordon Mills, Fong Xu, Armand Keating

Research output: Contribution to journalArticle

132 Citations (Scopus)

Abstract

A full length human androgen receptor complementary DNA was introduced into androgen receptor-negative PC-3 cells to determine if androgen sensitivity could be established in this cell line and to assess what influence, if any, androgen exposure would have on the growth of these cells. The androgen receptor complementary DNA was inserted into pSG5 in the region controlled by the SV40 promoter. This construct was cotransfected with pSRineo into PC-3 cells and stably transfected cells were selected and screened for the expression of the androgen receptor. Active expression of the receptor was demonstrated by Western blotting using a rabbit anti-androgen receptor antiserum and by [3H]methyltrienolone binding to cytosol extracts. Saturation ligand-binding analysis revealed the presence of a single class, high affinity (Kd = 0.122 niu) androgen-binding site in cytosol extracts of transfected cells but not in extracts from mock-transfected cells. In cells expressing the transfected androgen receptor, androgen decreased the proliferation rate and cloning efficiency and induced a more differentiated phenotype. These results demonstrate that PC-3 cells have retained the mechanisms required to respond to the activated androgen receptor and that the loss of androgen sensitivity in these cells is due to the lack of functional androgen receptor. This also provides a technique for determining whether androgen-resistant tumor cells contain functional androgen receptors or whether androgen sensitivity is due to abnormalities in downstream signaling pathways. The apparent androgen-induced decreased malignant state of these transfected cells suggests new directions for the treatment of prostate cancer.

Original languageEnglish (US)
Pages (from-to)1304-1311
Number of pages8
JournalCancer Research
Volume53
Issue number6
StatePublished - Jan 1 1993
Externally publishedYes

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Androgens
Androgen Receptors
Prostatic Neoplasms
Cell Proliferation
Cell Line
Cytosol
Complementary DNA
Metribolone
human AR protein
Cell Extracts
Organism Cloning
Immune Sera
Western Blotting
Binding Sites
Rabbits
Ligands
Phenotype
Growth

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

Cite this

Androgen-induced Inhibition of Cell Proliferation in an Androgen-insensitive Prostate Cancer Cell Line (PC-3) Transfected with a Human Androgen Receptor Complementary DNA1. / Yuan, Shixing; Mills, Gordon; Xu, Fong; Keating, Armand.

In: Cancer Research, Vol. 53, No. 6, 01.01.1993, p. 1304-1311.

Research output: Contribution to journalArticle

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abstract = "A full length human androgen receptor complementary DNA was introduced into androgen receptor-negative PC-3 cells to determine if androgen sensitivity could be established in this cell line and to assess what influence, if any, androgen exposure would have on the growth of these cells. The androgen receptor complementary DNA was inserted into pSG5 in the region controlled by the SV40 promoter. This construct was cotransfected with pSRineo into PC-3 cells and stably transfected cells were selected and screened for the expression of the androgen receptor. Active expression of the receptor was demonstrated by Western blotting using a rabbit anti-androgen receptor antiserum and by [3H]methyltrienolone binding to cytosol extracts. Saturation ligand-binding analysis revealed the presence of a single class, high affinity (Kd = 0.122 niu) androgen-binding site in cytosol extracts of transfected cells but not in extracts from mock-transfected cells. In cells expressing the transfected androgen receptor, androgen decreased the proliferation rate and cloning efficiency and induced a more differentiated phenotype. These results demonstrate that PC-3 cells have retained the mechanisms required to respond to the activated androgen receptor and that the loss of androgen sensitivity in these cells is due to the lack of functional androgen receptor. This also provides a technique for determining whether androgen-resistant tumor cells contain functional androgen receptors or whether androgen sensitivity is due to abnormalities in downstream signaling pathways. The apparent androgen-induced decreased malignant state of these transfected cells suggests new directions for the treatment of prostate cancer.",
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