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2016 ; 15
(11
): 2367-76
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Targeting One Carbon Metabolism with an Antimetabolite Disrupts Pyrimidine
Homeostasis and Induces Nucleotide Overflow
#MMPMID27264180
Ser Z
; Gao X
; Johnson C
; Mehrmohamadi M
; Liu X
; Li S
; Locasale JW
Cell Rep
2016[Jun]; 15
(11
): 2367-76
PMID27264180
show ga
Antimetabolites that affect nucleotide metabolism are frontline chemotherapy
agents in several cancers and often successfully target one carbon metabolism.
However, the precise mechanisms and resulting determinants of their therapeutic
value are unknown. We show that 5-fluorouracil (5-FU), a commonly used
antimetabolite therapeutic with varying efficacy, induces specific alterations to
nucleotide metabolism by disrupting pyrimidine homeostasis. An integrative
metabolomics analysis of the cellular response to 5-FU reveals intracellular
uracil accumulation, whereas deoxyuridine levels exhibited increased flux into
the extracellular space, resulting in an induction of overflow metabolism.
Subsequent analysis from mice bearing colorectal tumors treated with 5-FU show
specific secretion of metabolites in tumor-bearing mice into serum that results
from alterations in nucleotide flux and reduction in overflow metabolism.
Together, these findings identify a determinant of an antimetabolite response
that may be exploited to more precisely define the tumors that could respond to
targeting cancer metabolism.