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2016 ; 15
(9
): 1257-66
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The metabolic interaction of cancer cells and fibroblasts - coupling between
NAD(P)H and FAD, intracellular pH and hydrogen peroxide
#MMPMID26986068
Druzhkova IN
; Shirmanova MV
; Lukina MM
; Dudenkova VV
; Mishina NM
; Zagaynova EV
Cell Cycle
2016[May]; 15
(9
): 1257-66
PMID26986068
show ga
Alteration in the cellular energy metabolism is a principal feature of tumors. An
important role in modifying cancer cell metabolism belongs to the
cancer-associated fibroblasts. However, the regulation of their interaction has
been poorly studied to date. In this study we monitored the metabolic status of
both cell types by using the optical redox ratio and the fluorescence lifetimes
of the metabolic co-factors NAD(P)H and FAD, in addition to the intracellular pH
and the hydrogen peroxide levels in the cancer cells, using genetically encoded
sensors. In the co-culture of human cervical carcinoma cells HeLa and human
fibroblasts we observed a metabolic shift from oxidative phosphorylation toward
glycolysis in cancer cells, and from glycolysis toward OXPHOS in fibroblasts,
starting from Day 2 of co-culturing. The metabolic switch was accompanied by
hydrogen peroxide production and slight acidification of the cytosol in the
cancer cells in comparison with that of the corresponding monoculture. Therefore,
our HeLa-huFb system demonstrated metabolic behavior similar to Warburg type
tumors. To our knowledge, this is the first time that these 3 parameters have
been investigated together in a model of tumor-stroma co-evolution. We propose
that determination of the start-point of the metabolic alterations and
understanding of the mechanisms of their realization can open a new ways for
cancer treatment.