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Aging up-regulates ARA55 in stromal cells, inducing androgen-mediated prostate cancer cell proliferation and migration.

Abstract：

:Stromal cells in the peripheral zone (PZ) of the prostate from older males (PZ-old) could significantly promote Prostate cancer (PCa) growth compared with stromal cells from young males (PZ-young). But the mechanism is still unknown. In the co-culture system with PZ-old cells, Pc3/Du145 cells showed advanced proliferation and migration after Dihydrotestosterone (DHT) incubation, but DHT didn't show the similar effect in PZ-young co-culture system. Also, higher androgen/AR signal pathway activity and AR-related cytokines secretion (FGF-2, KGF, IGF-1) were found in PZ-old cells. As AR exprssison was equivalent in PZ-old and PZ-young cells, we focused on Androgen receptor associated protein-55(ARA55), a stromal-specific androgen receptor (AR) coactivator. ARA55 expression was higher in PZ-old cells compared with PZ-young cells in vitro. After knocking down ARA55 expression in PZ-old cells, the PCa growth- promoting effect from the PZ-old cells was diminished, which may be explained by the decreased the progressive cytokines secretion (FGF-2, KGF, IGF-1) from PZ-old stromal cells. In vivo, the consistent results were also found: PZ-old cells promoted prostate cancer cells growth, but this effect receded when knocking down ARA55 expression in PZ-old cells. From our study, we found PZ stromal cells presented age-related effects in proliferation and migration of prostate cancer cells in the androgen/AR dependent manner. As aging increased, more ARA55 were expressed in PZ stromal cells, leading to more sensitive androgen/androgen receptor (AR) signal pathway, then constituting a more feasible environment to cancer cells.

journal_name

J Mol Histol

journal_title

Journal of molecular histology

authors

Zou Q,Cui D,Liang S,Xia S,Jing Y,Han B

doi

10.1007/s10735-016-9679-y

subject

Has Abstract

pub_date

2016-06-01 00:00:00

pages

305-15

issue

3

eissn

1567-2379

issn

1567-2387

pii

10.1007/s10735-016-9679-y

journal_volume

47

pub_type

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