Format

Send to

Choose Destination
Prog Urol. 2016 Mar;26(3):159-67. doi: 10.1016/j.purol.2016.01.004. Epub 2016 Feb 16.

[Mechanisms of castration resistance: Intratumoral hypoxia stimulates the androgen receptor expression].

[Article in French]

Author information

1
Département d'urologie, d'andrologie et de transplantation rénale, 1, avenue J.-Pouilhès, 31059 Toulouse, France. Electronic address: lunardi.p@chu-toulouse.fr.
2
Département d'urologie, d'andrologie et de transplantation rénale, 1, avenue J.-Pouilhès, 31059 Toulouse, France.
3
Inserm, institut de pharmacologie et de biologie structurale, 205, route de Narbonne, 31077 Toulouse, France.

Abstract

PURPOSE:

Tumor hypoxia and its biological consequence lead to microenvironment adaptation of tumor initiation, promotion and progression. The aim of the study was to observe the influence of hypoxia on the expression of the androgen receptor (AR), using an original model of multicellular spheroids obtained from castration-resistant prostate tumor cells.

MATERIAL:

Two human castration-resistant prostate cancer cell lines have been used to generate multicellular tumor spheroids (MTS). The conditions and duration of incubation modulated the final size of the MTS and the intrinsic hypoxia gradient. The expression of AR was studied by immunohistochemistry (IHC) and secretion of PSA measured in the culture medium.

RESULTS:

The IHC expression of AR was characterized by a decreasing gradient from the periphery to the center of MTS (less intense in central hypoxic zone), corresponding to a nuclear translocation of activated AR. This result was proportionally correlated with the duration of hypoxic incubation period. Hypoxia caused significant increase in AR expression at 6h of oxygen deprivation. This activation of AR was correlated with transcriptional activity increase of target genes, including increased secretion of PSA.

CONCLUSION:

This demonstration of activation, increased expression and increased transcriptional activity of AR by hypoxia is the first to have been made with an original model of hypoxia, closer to reality than previous models, i.e. close to tissue hypoxia observed in primary prostate cancer.

LEVEL OF EVIDENCE:

4.

KEYWORDS:

Androgen receptor; Cancer de la prostate; Hypoxia; Hypoxie; Prostate cancer; Récepteur aux androgènes; Sphéroïdes tumoraux; Tumor spheroids

PMID:
26896427
DOI:
10.1016/j.purol.2016.01.004
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center