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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
2016 ; 291
(20
): 10904-15
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Activated ?2-Macroglobulin Regulates Transcriptional Activation of c-MYC Target
Genes through Cell Surface GRP78 Protein
#MMPMID27002159
Gopal U
; Gonzalez-Gronow M
; Pizzo SV
J Biol Chem
2016[May]; 291
(20
): 10904-15
PMID27002159
show ga
Activated ?2-macroglobulin (?2M*) signals predominantly through cell surface
GRP78 (CS-GRP78) to promote proliferation and survival of cancer cells; however,
the molecular mechanism remains obscure. c-MYC is an essential transcriptional
regulator that controls cell proliferation. We hypothesize that
?2M*/CS-GRP78-evoked key signaling events are required for transcriptional
activation of c-MYC target genes. Activation of CS-GRP78 by ?2M* requires
ligation of the GRP78 primary amino acid sequence (Leu(98)-Leu(115)). After
stimulation with ?2M*, CS-GRP78 signaling activates 3-phosphoinositide-dependent
protein kinase-1 (PDK1) to induce phosphorylation of PLK1, which in turn induces
c-MYC transcription. We demonstrate that PLK1 binds directly to c-MYC and
promotes its transcriptional activity by phosphorylating Ser(62) Moreover,
activated c-MYC is recruited to the E-boxes of target genes FOSL1 and ID2 by
phosphorylating histone H3 at Ser(10) In addition, targeting the
carboxyl-terminal domain of CS-GRP78 with a mAb suppresses transcriptional
activation of c-MYC target genes and impairs cell proliferation. This work
demonstrates that ?2M*/CS-GRP78 acts as an upstream regulator of the PDK1/PLK1
signaling axis to modulate c-MYC transcription and its target genes, suggesting a
therapeutic strategy for targeting c-MYC-associated malignant progression.
|*Signal Transduction
[MESH]
|*Transcriptional Activation
[MESH]
|Cell Line, Tumor
[MESH]
|Endoplasmic Reticulum Chaperone BiP
[MESH]
|Female
[MESH]
|Heat-Shock Proteins/genetics/*metabolism
[MESH]
|Humans
[MESH]
|Inhibitor of Differentiation Protein 2/biosynthesis/genetics
[MESH]