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2014 ; 35
(6
): 1399-406
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TR4 nuclear receptor functions as a tumor suppressor for prostate tumorigenesis
via modulation of DNA damage/repair system
#MMPMID24583925
Lin SJ
; Lee SO
; Lee YF
; Miyamoto H
; Yang DR
; Li G
; Chang C
Carcinogenesis
2014[Jun]; 35
(6
): 1399-406
PMID24583925
show ga
Testicular nuclear receptor 4 (TR4), a member of the nuclear receptor
superfamily, plays important roles in metabolism, fertility and aging. The
linkage of TR4 functions in cancer progression, however, remains unclear. Using
three different mouse models, we found TR4 could prevent or delay prostate cancer
(PCa)/prostatic intraepithelial neoplasia development. Knocking down TR4 in human
RWPE1 and mouse mPrE normal prostate cells promoted tumorigenesis under
carcinogen challenge, suggesting TR4 may play a suppressor role in PCa
initiation. Mechanism dissection in both in vitro cell lines and in vivo mice
studies found that knocking down TR4 led to increased DNA damage with altered DNA
repair system that involved the modulation of ATM expression at the
transcriptional level, and addition of ATM partially interrupted the TR4 small
interfering RNA-induced tumorigenesis in cell transformation assays.
Immunohistochemical staining in human PCa tissue microarrays revealed ATM
expression is highly correlated with TR4 expression. Together, these results
suggest TR4 may function as a tumor suppressor to prevent or delay prostate
tumorigenesis via regulating ATM expression at the transcriptional level.