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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+Cell+Biol
2015 ; 211
(3
): 619-37
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AMIGO2, a novel membrane anchor of PDK1, controls cell survival and angiogenesis
via Akt activation
#MMPMID26553931
Park H
; Lee S
; Shrestha P
; Kim J
; Park JA
; Ko Y
; Ban YH
; Park DY
; Ha SJ
; Koh GY
; Hong VS
; Mochizuki N
; Kim YM
; Lee W
; Kwon YG
J Cell Biol
2015[Nov]; 211
(3
): 619-37
PMID26553931
show ga
The phosphoinositide 3-kinase-Akt signaling pathway is essential to many
biological processes, including cell proliferation, survival, metabolism, and
angiogenesis, under pathophysiological conditions. Although
3-phosphoinositide-dependent kinase 1 (PDK1) is a primary activator of Akt at the
plasma membrane, the optimal activation mechanism remains unclear. We report that
adhesion molecule with IgG-like domain 2 (AMIGO2) is a novel scaffold protein
that regulates PDK1 membrane localization and Akt activation. Loss of AMIGO2 in
endothelial cells (ECs) led to apoptosis and inhibition of angiogenesis with Akt
inactivation. Amino acid residues 465-474 in AMIGO2 directly bind to the PDK1
pleckstrin homology domain. A synthetic peptide containing the AMIGO2 465-474
residues abrogated the AMIGO2-PDK1 interaction and Akt activation. Moreover, it
effectively suppressed pathological angiogenesis in murine tumor and
oxygen-induced retinopathy models. These results demonstrate that AMIGO2 is an
important regulator of the PDK1-Akt pathway in ECs and suggest that interference
of the PDK1-AMIGO2 interaction might be a novel pharmaceutical target for
designing an Akt pathway inhibitor.