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2016 ; 7
(24
): 37103-37120
Nephropedia Template TP
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English Wikipedia
The novel choline kinase inhibitor ICL-CCIC-0019 reprograms cellular metabolism
and inhibits cancer cell growth
#MMPMID27206796
Trousil S
; Kaliszczak M
; Schug Z
; Nguyen QD
; Tomasi G
; Favicchio R
; Brickute D
; Fortt R
; Twyman FJ
; Carroll L
; Kalusa A
; Navaratnam N
; Adejumo T
; Carling D
; Gottlieb E
; Aboagye EO
Oncotarget
2016[Jun]; 7
(24
): 37103-37120
PMID27206796
show ga
The glycerophospholipid phosphatidylcholine is the most abundant phospholipid
species of eukaryotic membranes and essential for structural integrity and
signaling function of cell membranes required for cancer cell growth. Inhibition
of choline kinase alpha (CHKA), the first committed step to phosphatidylcholine
synthesis, by the selective small-molecule ICL-CCIC-0019, potently suppressed
growth of a panel of 60 cancer cell lines with median GI50 of 1.12 ?M and
inhibited tumor xenograft growth in mice. ICL-CCIC-0019 decreased phosphocholine
levels and the fraction of labeled choline in lipids, and induced G1 arrest,
endoplasmic reticulum stress and apoptosis. Changes in phosphocholine cellular
levels following treatment could be detected non-invasively in tumor xenografts
by [18F]-fluoromethyl-[1,2-2H4]-choline positron emission tomography. Herein, we
reveal a previously unappreciated effect of choline metabolism on mitochondria
function. Comparative metabolomics demonstrated that phosphatidylcholine pathway
inhibition leads to a metabolically stressed phenotype analogous to mitochondria
toxin treatment but without reactive oxygen species activation. Drug treatment
decreased mitochondria function with associated reduction of citrate synthase
expression and AMPK activation. Glucose and acetate uptake were increased in an
attempt to overcome the metabolic stress. This study indicates that choline
pathway pharmacological inhibition critically affects the metabolic function of
the cell beyond reduced synthesis of phospholipids.