Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 213.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Deprecated: Implicit conversion from float 247.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534
Warning: imagejpeg(C:\Inetpub\vhosts\kidney.de\httpdocs\phplern\27111337
.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Small+GTPases
2016 ; 7
(3
): 178-85
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Interplay between PREX2 mutations and the PI3K pathway and its effect on
epigenetic regulation of gene expression in NRAS-mutant melanoma
#MMPMID27111337
Lissanu Deribe Y
Small GTPases
2016[Jul]; 7
(3
): 178-85
PMID27111337
show ga
PREX2 is a PTEN interacting protein that is significantly mutated in melanoma and
pancreatic ductal adenocarcinoma. Recently, we reported the mechanistic basis of
melanomagenesis by PREX2 mutations. Truncating PREX2 mutations activate its
guanine nucleotide exchange factor activity for its substrate RAC1. This leads to
increased PI3K/AKT signaling associated with reduced DNA methylation and
increased cell proliferation in NRAS-mutant melanoma. Here, we provide additional
data that indicates a reciprocal regulation of PREX2 by PTEN whereby loss of PTEN
results in a dramatic increase in expression of PREX2 at the protein level.
Pharmacologic studies revealed destabilization of PREX2 by inhibition of PI3K/AKT
signaling. Additionally, we provide data to show a selective decrease in a
particular histone mark, H4 Lys20 trimethylation, in cells expressing PREX2
(E824*) truncating mutation globally and at the imprint control region of CDKN1C
(also known as p57) and IGF2. The decrease in H4K20 trimethylation coupled with
DNA hypomethylation at this particular locus is associated with genomic
imprinting and regulation of expression of p57 and IGF2. Taken together, these
results demonstrate the complex signaling mechanisms that involve PREX2,
PI3K/AKT/PTEN and downstream epigenetic machinery to deregulate expression of key
cell cycle regulators.