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2017 ; 8
(1
): 1508
Nephropedia Template TP
gab.com Text
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English Wikipedia
PTEN is a protein phosphatase that targets active PTK6 and inhibits PTK6
oncogenic signaling in prostate cancer
#MMPMID29142193
Wozniak DJ
; Kajdacsy-Balla A
; Macias V
; Ball-Kell S
; Zenner ML
; Bie W
; Tyner AL
Nat Commun
2017[Nov]; 8
(1
): 1508
PMID29142193
show ga
PTEN activity is often lost in prostate cancer. We show that the tyrosine kinase
PTK6 (BRK) is a PTEN substrate. Phosphorylation of PTK6 tyrosine 342 (PY342)
promotes activation, while phosphorylation of tyrosine 447 (PY447) regulates
auto-inhibition. Introduction of PTEN into a PTEN null prostate cancer cell line
leads to dephosphorylation of PY342 but not PY447 and PTK6 inhibition.
Conversely, PTEN knockdown promotes PTK6 activation in PTEN positive cells. Using
a variety of PTEN mutant constructs, we show that protein phosphatase activity of
PTEN targets PTK6, with efficiency similar to PTP1B, a phosphatase that directly
dephosphorylates PTK6 Y342. Conditional disruption of Pten in the mouse prostate
leads to tumorigenesis and increased phosphorylation of PTK6 Y342, and disruption
of Ptk6 impairs tumorigenesis. In human prostate tumor tissue microarrays, loss
of PTEN correlates with increased PTK6 PY342 and poor outcome. These data suggest
PTK6 activation promotes invasive prostate cancer induced by PTEN loss.