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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Cancer+Discov
2015 ; 5
(6
): 636-51
Nephropedia Template TP
gab.com Text
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English Wikipedia
MYC Drives Pten/Trp53-Deficient Proliferation and Metastasis due to IL6 Secretion
and AKT Suppression via PHLPP2
#MMPMID25829425
Nowak DG
; Cho H
; Herzka T
; Watrud K
; DeMarco DV
; Wang VM
; Senturk S
; Fellmann C
; Ding D
; Beinortas T
; Kleinman D
; Chen M
; Sordella R
; Wilkinson JE
; Castillo-Martin M
; Cordon-Cardo C
; Robinson BD
; Trotman LC
Cancer Discov
2015[Jun]; 5
(6
): 636-51
PMID25829425
show ga
We have recently recapitulated metastasis of human PTEN/TP53-mutant prostate
cancer in the mouse using the RapidCaP system. Surprisingly, we found that this
metastasis is driven by MYC, and not AKT, activation. Here, we show that
cell-cell communication by IL6 drives the AKT-MYC switch through activation of
the AKT-suppressing phosphatase PHLPP2, when PTEN and p53 are lost together, but
not separately. IL6 then communicates a downstream program of STAT3-mediated MYC
activation, which drives cell proliferation. Similarly, in tissues, peak
proliferation in Pten/Trp53-mutant primary and metastatic prostate cancer does
not correlate with activated AKT, but with STAT3/MYC activation instead.
Mechanistically, MYC strongly activates the AKT phosphatase PHLPP2 in primary
cells and prostate cancer metastasis. We show genetically that Phlpp2 is
essential for dictating the proliferation of MYC-mediated AKT suppression.
Collectively, our data reveal competition between two proto-oncogenes, MYC and
AKT, which ensnarls the Phlpp2 gene to facilitate MYC-driven prostate cancer
metastasis after loss of Pten and Trp53. SIGNIFICANCE: Our data identify IL6
detection as a potential causal biomarker for MYC-driven metastasis after loss of
PTEN and p53. Second, our finding that MYC then must supersede AKT to drive cell
proliferation points to MYC inhibition as a critical part of PI3K pathway therapy
in lethal prostate cancer.