Cited by 297Cancer, Hypoxia, and MetabolismMetabolism, Diabetes, and CancerAmino Acid Enzymes and Metabolism

Targeting aspartate aminotransferase in breast cancer

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Thornburg, Joshua Marshall, Nelson, Kristin K, Clem, Brian F, Lane, Andrew N, Arumugam, Sengodagounder, Simmons, Allan, Eaton, John W, Telang, Sucheta +1 more·2008·Breast Cancer Research

Abstract

Introduction: Glycolysis is increased in breast adenocarcinoma cells relative to adjacent normal cells in order to produce the ATP and anabolic precursors required for survival, growth and invasion. Glycolysis also serves as a key source of the reduced form of cytoplasmic nicotinamide adenine dinucleotide (NADH) necessary for the shuttling of electrons into mitochondria for electron transport. Lactate dehydrogenase (LDH) regulates glycolytic flux by converting pyruvate to lactate and has been found to be highly expressed in breast tumours. Aspartate aminotransferase (AAT) functions in tandem with malate dehydrogenase to transfer electrons from NADH across the inner mitochondrial membrane. Oxamate is an inhibitor of both LDH and AAT, and we hypothesised that oxamate may disrupt the metabolism and growth of breast adenocarcinoma cells. Methods: We examined the effects of oxamate and the AAT inhibitor amino oxyacetate (AOA) on 13 C-glucose utilisation, oxygen consumption, NADH and ATP in MDA-MB-231 cells. We then determined the effects of oxamate and AOA on normal human mammary epithelial cells and MDA-MB-231 breast adenocarcinoma cell proliferation, and on the growth of MDA-MB-231 cells as tumours in athymic BALB/c female mice. We ectopically expressed AAT in MDA-MB-231 cells and examined the consequences on the cytostatic effects of oxamate. Finally, we examined the effect of AAT-specific siRNA transfection on MDA-MB-231 cell proliferation. Results: We found that oxamate did not attenuate cellular lactate production as predicted by its LDH inhibitory activity, but did have an anti-metabolic effect that was similar to AAT inhibition with AOA. Specifically, we found that oxamate and AOA decreased the flux of 13 C-glucose-derived carbons into glutamate and uridine, both products of the mitochondrial tricarboxylic acid cycle, as well as oxygen consumption, a measure of electron transport chain activity. Oxamate and AOA also selectively suppressed the proliferation of MDA-MB-231 cells relative to normal human mammary epithelial cells and decreased the growth of MDA-MB-231 breast tumours in athymic mice. Importantly, we found that ectopic expression of AAT in MDA-MB-231 cells conferred resistance to the anti-proliferative effects of oxamate and that siRNA silencing of AAT decreased MDA-MB-231 cell proliferation. Conclusions: We conclude that AAT may be a valid molecular target for the development of anti-neoplastic agents.

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  • Glutamate consumption by aminotransferases to generate NEAAs is required for tumor growth in diverse cancer types.

    “Glutamate consumption by aminotransferases to generate NEAAs has also been indicated to be required for tumor growth in diverse cancer types29,40–42.”

    From Glutamine reliance in cell metabolism (2020) · cites this paper as [40]

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2 of the 49 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. Voet D Voet J Metabolism: Glycolysis. Biochemistry 1995 Second Wiley and Sons, USA 444 476
  2. Cooper AJL Meister A Transaminases 1985 New York: John Wiley and Sons

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Authors
Thornburg, J. M., Nelson, K. K., Clem, B. F., Lane, A. N., Arumugam, S., Simmons, A., Eaton, J. W., Telang, S., & Chesney, J.
Affiliations
University of Louisville (US)
Corresponding author
Chesney, Jason
Venue
Breast Cancer Research
Published
2008-10-15
Volume
10
Issue
5
Pages
R84-R84
ISSN
  • 1465-5411 (ISSN-L)
  • 1465-542X
OpenAlex
W2107254151
Cited by
288
References
49
Citations by year
2026: 6 · 2025: 8 · 2024: 16 · 2023: 16 · 2022: 24 · 2021: 19 · 2020: 26 · 2019: 26 · 2018: 20 · 2017: 16 · 2016: 24 · 2015: 20 · 2014: 17 · 2013: 16 · 2012: 8
FWCI
3.07
Type
journal article
Language
en
Open access
Locations
  • Breast Cancer Research (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01ca116428-02)
  • National Cancer Institute (R01CA116428, 1 R01 CA116428-01)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer, Hypoxia, and Metabolism
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
aspartate aminotransferase, breast cancer, oxamate, aminooxyacetic acid, glycolysis, mitochondrial electron transport chain, NADH, lactate dehydrogenase, malate dehydrogenase, TCA cycle, glutamate, uridine, oxygen consumption, MDA-MB-231 cells
MeSH terms
Lactate Dehydrogenase 5, Adenocarcinoma, Aminooxyacetic Acid, Animals, Antineoplastic Agents, Aspartate Aminotransferases, Breast Neoplasms, Cell Division, Citric Acid Cycle, Female, Glycolysis, Humans, Isoenzymes, L-Lactate Dehydrogenase, Mice, Inbred BALB C, Mice, Nude, Neoplasm Proteins, Oxamic Acid, Recombinant Fusion Proteins, Tumor Stem Cell Assay, Drug Delivery Systems, Xenograft Model Antitumor Assays, RNA Interference, RNA, Small Interfering, Cell Line, Tumor, Mice, Cytostatic Agents

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