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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
(13
): 5253-5261
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Metformin Promotes AMP-activated Protein Kinase-independent Suppression of ?Np63?
Protein Expression and Inhibits Cancer Cell Viability
#MMPMID28193839
Yi Y
; Chen D
; Ao J
; Sun S
; Wu M
; Li X
; Bergholz J
; Zhang Y
; Xiao ZX
J Biol Chem
2017[Mar]; 292
(13
): 5253-5261
PMID28193839
show ga
The blood glucose modifier metformin is used to treat type II diabetes and has
also been shown to possess anticancer activities. Recent studies indicate that
glucose deprivation can greatly enhance metformin-mediated inhibition of cell
viability, but the molecular mechanism involved in this inhibition is unclear. In
this study, we report that, under glucose deprivation, metformin inhibited
expression of ?Np63?, a p53 family member involved in cell adhesion pathways,
resulting in disruption of cell matrix adhesion and subsequent apoptosis in human
squamous carcinoma cells. We further show that metformin promoted ?Np63? protein
instability independent of AMP-activated protein kinase and that WWP1, an E3
ligase of ?Np63?, was involved in metformin-mediated down-regulation of ?Np63?
levels. In addition, we demonstrate that a combination of metformin and the
glycolysis inhibitor 2-deoxy-d-glucose significantly inhibited ?Np63? expression
and also suppressed xenographic tumor growth in vivo In summary, this study
reveals a new mechanism for metformin-mediated anticancer activity and suggests a
new strategy for treating human squamous cell carcinoma.