Increased OXPHOS activity precedes rise in glycolytic rate in H-RasV12/E1A transformed fibroblasts that develop a Warburg phenotype

被引:61
作者
de Groof, Ad J. C. [1 ]
Lindert, Mariska M. Te [1 ]
van Dommelen, Michiel M. T. [1 ]
Wu, Min [2 ]
Willemse, Marieke [1 ]
Smift, Amy L. [2 ]
Winer, Mike [2 ]
Oerlemans, Frank [1 ]
Pluk, Helma [1 ]
Fransen, Jack A. M. [1 ]
Wieringa, Be [1 ]
机构
[1] Radboud Univ Nijmegen, Med Ctr, Nijmegen Ctr Mol Life Sci, Dept Cell Biol, NL-6525 ED Nijmegen, Netherlands
[2] Seahorse Biosci, N Billerica, MA 01862 USA
来源
MOLECULAR CANCER | 2009年 / 8卷
关键词
CANCER-CELLS; REDOX STATE; LIFE-SPAN; MITOCHONDRIAL; METABOLISM; PHASE; PROTEIN; GROWTH; ACTIVATION; MODULATOR;
D O I
10.1186/1476-4598-8-54
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Background: The Warburg phenotype in cancer cells has been long recognized, but there is still limited insight in the consecutive metabolic alterations that characterize its establishment. We obtained better understanding of the coupling between metabolism and malignant transformation by studying mouse embryonic fibroblast-derived cells with loss-of-senescence or H-RasV12/E1A-transformed phenotypes at different stages of oncogenic progression. Results: Spontaneous immortalization or induction of senescence-bypass had only marginal effects on metabolic profiles and viability. In contrast, H-RasV12/E1A transformation initially caused a steep increase in oxygen consumption and superoxide production, accompanied by massive cell death. During prolonged culture in vitro, cell growth rate increased gradually, along with tumor forming potential in in vitro anchorage-independent growth assays and in vivo tumor formation assays in immuno-deficient mice. Notably, glucose-to-lactic acid flux increased with passage number, while cellular oxygen consumption decreased. This conversion in metabolic properties was associated with a change in mitochondrial NAD(+)/NADH redox, indicative of decreased mitochondrial tricarboxic acid cycle and OXPHOS activity. Conclusion: The high rate of oxidative metabolism in newly transformed cells is in marked contrast with the high glycolytic rate in cells in the later tumor stage. In our experimental system, with cells growing under ambient oxygen conditions in nutrient-rich media, the shift towards this Warburg phenotype occurred as a step-wise adaptation process associated with augmented tumorigenic capacity and improved survival characteristics of the transformed cells. We hypothesize that early-transformed cells, which potentially serve as founders for new tumor masses may escape therapies aimed at metabolic inhibition of tumors with a fully developed Warburg phenotype.
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页数:14
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