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2016 ; 7
(16
): 22295-323
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Exploring the role of sphingolipid machinery during the epithelial to mesenchymal
transition program using an integrative approach
#MMPMID26967245
Meshcheryakova A
; Svoboda M
; Tahir A
; Köfeler HC
; Triebl A
; Mungenast F
; Heinze G
; Gerner C
; Zimmermann P
; Jaritz M
; Mechtcheriakova D
Oncotarget
2016[Apr]; 7
(16
): 22295-323
PMID26967245
show ga
The epithelial to mesenchymal transition (EMT) program is activated in epithelial
cancer cells and facilitates their ability to metastasize based on enhanced
migratory, proliferative, anti-apoptotic, and pluripotent capacities. Given the
fundamental impact of sphingolipid machinery to each individual process, the
sphingolipid-related mechanisms might be considered among the most prominent
drivers/players of EMT; yet, there is still limited knowledge. Given the
complexity of the interconnected sphingolipid system, which includes distinct
sphingolipid mediators, their synthesizing enzymes, receptors and transporters,
we herein apply an integrative approach for assessment of the
sphingolipid-associated mechanisms underlying EMT program. We created the
sphingolipid-/EMT-relevant 41-gene/23-gene signatures which were applied to
denote transcriptional events in a lung cancer cell-based EMT model. Based on
defined 35-gene sphingolipid/EMT-attributed signature of regulated genes, we show
close associations between EMT markers, genes comprising the sphingolipid network
at multiple levels and encoding sphingosine 1-phosphate
(S1P)-/ceramide-metabolizing enzymes, S1P and lysophosphatidic acid (LPA)
receptors and S1P transporters, pluripotency genes and inflammation-related
molecules, and demonstrate the underlying biological pathways and regulators.
Mass spectrometry-based sphingolipid analysis revealed an EMT-attributed shift
towards increased S1P and LPA accompanied by reduced ceramide levels. Notably,
using transcriptomics data across various cell-based perturbations and neoplastic
tissues (24193 arrays), we identified the sphingolipid/EMT signature primarily in
lung adenocarcinoma tissues; besides, bladder, colorectal and prostate cancers
were among the top-ranked. The findings also highlight novel regulatory
associations between influenza virus and the sphingolipid/EMT-associated
mechanisms. In sum, data propose the multidimensional contribution of
sphingolipid machinery to pathological EMT and may yield new biomarkers and
therapeutic targets.