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2015 ; 6
(17
): 15594-609
Nephropedia Template TP
gab.com Text
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PBK/TOPK enhances aggressive phenotype in prostate cancer via
?-catenin-TCF/LEF-mediated matrix metalloproteinases production and invasion
#MMPMID25909225
Brown-Clay JD
; Shenoy DN
; Timofeeva O
; Kallakury BV
; Nandi AK
; Banerjee PP
Oncotarget
2015[Jun]; 6
(17
): 15594-609
PMID25909225
show ga
A current challenge in prostate cancer treatment is how to differentiate
aggressive disease from indolent prostate cancer. There is an urgent need to
identify markers that would accurately distinguish indolent prostate cancer from
aggressive disease. The aim of this study was to evaluate the role of PDZ
Domain-binding kinase (PBK) in prostate cancer and to determine if PBK expression
enhances aggressiveness in prostate cancer. Using archival tissue samples,
gain-of-function and loss-of-function studies, we show that PBK expression is
up-regulated in prostate cancer, and its expression level is commensurate with
invasiveness. Modulation of PBK expression and function causally regulates the
invasive ability of prostate cancer cells. Production of matrix
metalloproteinases-2 and -9, which are key players in metastatic invasion, is
up-regulated, and the promoters of these genes are transcriptionally activated by
PBK via increased ?-catenin-TCF/LEF signaling. Prostate cancer tissue specimens
show that PBK's expression correlates with aggressive disease and distant
metastasis in bone, lymph node and abdomen. Our in vitro and in situ data are in
agreement that PBK could be a prognostic biomarker for prostate cancer that would
discriminate aggressive prostate cancer from indolent disease, and is a potential
target for the therapeutic intervention of aggressive prostate cancer in men.