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2016 ; 22
(4
): 427-32
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Inhibition of fatty acid oxidation as a therapy for MYC-overexpressing
triple-negative breast cancer
#MMPMID26950360
Camarda R
; Zhou AY
; Kohnz RA
; Balakrishnan S
; Mahieu C
; Anderton B
; Eyob H
; Kajimura S
; Tward A
; Krings G
; Nomura DK
; Goga A
Nat Med
2016[Apr]; 22
(4
): 427-32
PMID26950360
show ga
Expression of the oncogenic transcription factor MYC is disproportionately
elevated in triple-negative breast cancer (TNBC), as compared to estrogen
receptor-, progesterone receptor- or human epidermal growth factor 2
receptor-positive (RP) breast cancer. We and others have shown that MYC alters
metabolism during tumorigenesis. However, the role of MYC in TNBC metabolism
remains mostly unexplored. We hypothesized that MYC-dependent metabolic
dysregulation is essential for the growth of MYC-overexpressing TNBC cells and
may identify new therapeutic targets for this clinically challenging subset of
breast cancer. Using a targeted metabolomics approach, we identified fatty acid
oxidation (FAO) intermediates as being dramatically upregulated in a MYC-driven
model of TNBC. We also identified a lipid metabolism gene signature in patients
with TNBC that were identified from The Cancer Genome Atlas database and from
multiple other clinical data sets, implicating FAO as a dysregulated pathway that
is critical for TNBC cell metabolism. We found that pharmacologic inhibition of
FAO catastrophically decreased energy metabolism in MYC-overexpressing TNBC cells
and blocked tumor growth in a MYC-driven transgenic TNBC model and in a
MYC-overexpressing TNBC patient-derived xenograft. These findings demonstrate
that MYC-overexpressing TNBC shows an increased bioenergetic reliance on FAO and
identify the inhibition of FAO as a potential therapeutic strategy for this
subset of breast cancer.