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Cell Metab. 2012 Jan 4;15(1):110-21. doi: 10.1016/j.cmet.2011.12.009.

Glucose-independent glutamine metabolism via TCA cycling for proliferation and survival in B cells.

Author information

1
Division of Gastrointestinal and Liver Pathology, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. annele@jhmi.edu

Abstract

Because MYC plays a causal role in many human cancers, including those with hypoxic and nutrient-poor tumor microenvironments, we have determined the metabolic responses of a MYC-inducible human Burkitt lymphoma model P493 cell line to aerobic and hypoxic conditions, and to glucose deprivation, using stable isotope-resolved metabolomics. Using [U-(13)C]-glucose as the tracer, both glucose consumption and lactate production were increased by MYC expression and hypoxia. Using [U-(13)C,(15)N]-glutamine as the tracer, glutamine import and metabolism through the TCA cycle persisted under hypoxia, and glutamine contributed significantly to citrate carbons. Under glucose deprivation, glutamine-derived fumarate, malate, and citrate were significantly increased. Their (13)C-labeling patterns demonstrate an alternative energy-generating glutaminolysis pathway involving a glucose-independent TCA cycle. The essential role of glutamine metabolism in cell survival and proliferation under hypoxia and glucose deficiency makes them susceptible to the glutaminase inhibitor BPTES and hence could be targeted for cancer therapy.

PMID:
22225880
PMCID:
PMC3345194
DOI:
10.1016/j.cmet.2011.12.009
[Indexed for MEDLINE]
Free PMC Article

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