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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 J+Biol+Chem
2017 ; 292
(12
): 5055-5069
Nephropedia Template TP
J Biol Chem
2017[Mar]; 292
(12
): 5055-5069
PMID28174297
show ga
We previously discovered that systemic delivery of decorin for treatment of
breast carcinoma xenografts induces paternally expressed gene 3 (Peg3), an
imprinted gene encoding a zinc finger transcription factor postulated to function
as a tumor suppressor. Here we found that de novo expression of Peg3 increased
Beclin 1 promoter activity and protein expression. This process required the
full-length Peg3 as truncated mutants lacking either the N-terminal SCAN domain
or the zinc fingers failed to translocate to the nucleus and promote Beclin 1
transcription. Importantly, overexpression of Peg3 in endothelial cells
stimulated autophagy and concurrently inhibited endothelial cell migration and
evasion from a 3D matrix. Mechanistically, we found that Peg3 induced the
secretion of the powerful angiostatic glycoprotein Thrombospondin 1 independently
of Beclin 1 transcriptional induction. Thus, we provide a new mechanism whereby
Peg3 can simultaneously evoke autophagy in endothelial cells and attenuate
angiogenesis.