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2015 ; 290
(41
): 24760-71
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The Plasma Membrane Calcium Pump in Pancreatic Cancer Cells Exhibiting the
Warburg Effect Relies on Glycolytic ATP
#MMPMID26294767
James AD
; Patel W
; Butt Z
; Adiamah M
; Dakhel R
; Latif A
; Uggenti C
; Swanton E
; Imamura H
; Siriwardena AK
; Bruce JI
J Biol Chem
2015[Oct]; 290
(41
): 24760-71
PMID26294767
show ga
Evidence suggests that the plasma membrane Ca(2+)-ATPase (PMCA), which is
critical for maintaining a low intracellular Ca(2+) concentration ([Ca(2+)]i),
utilizes glycolytically derived ATP in pancreatic ductal adenocarcinoma (PDAC)
and that inhibition of glycolysis in PDAC cell lines results in ATP depletion,
PMCA inhibition, and an irreversible [Ca(2+)]i overload. We explored whether this
is a specific weakness of highly glycolytic PDAC by shifting PDAC cell (MIA
PaCa-2 and PANC-1) metabolism from a highly glycolytic phenotype toward
mitochondrial metabolism and assessing the effects of mitochondrial versus
glycolytic inhibitors on ATP depletion, PMCA inhibition, and [Ca(2+)]i overload.
The highly glycolytic phenotype of these cells was first reversed by depriving
MIA PaCa-2 and PANC-1 cells of glucose and supplementing with ?-ketoisocaproate
or galactose. These culture conditions resulted in a significant decrease in both
glycolytic flux and proliferation rate, and conferred resistance to ATP depletion
by glycolytic inhibition while sensitizing cells to mitochondrial inhibition.
Moreover, in direct contrast to cells exhibiting a high glycolytic rate,
glycolytic inhibition had no effect on PMCA activity and resting [Ca(2+)]i in
?-ketoisocaproate- and galactose-cultured cells, suggesting that the glycolytic
dependence of the PMCA is a specific vulnerability of PDAC cells exhibiting the
Warburg phenotype.