Inhibition of lactate dehydrogenase A induces oxidative stress and inhibits tumor progression.

Abstract

As the result of genetic alterations and tumor hypoxia, many cancer cells avidly take up glucose and generate lactate through lactate dehydrogenase A (LDHA), which is encoded by a target gene of c-Myc and hypoxia-inducible factor (HIF-1). Previous studies with reduction of LDHA expression indicate that LDHA is involved in tumor initiation, but its role in tumor maintenance and progression has not been established. Furthermore, how reduction of LDHA expression by interference or antisense RNA inhibits tumorigenesis is not well understood. Here, we report that reduction of LDHA by siRNA or its inhibition by a small-molecule inhibitor (FX11 [3-dihydroxy-6-methyl-7-(phenylmethyl)-4-propylnaphthalene-1-carboxylic acid]) reduced ATP levels and induced significant oxidative stress and cell death that could be partially reversed by the antioxidant N-acetylcysteine. Furthermore, we document that FX11 inhibited the progression of sizable human lymphoma and pancreatic cancer xenografts. When used in combination with the NAD(+) synthesis inhibitor FK866, FX11 induced lymphoma regression. Hence, inhibition of LDHA with FX11 is an achievable and tolerable treatment for LDHA-dependent tumors. Our studies document a therapeutical approach to the Warburg effect and demonstrate that oxidative stress and metabolic phenotyping of cancers are critical aspects of cancer biology to consider for the therapeutical targeting of cancer energy metabolism.

• Authors: Anne Le, Charles R Cooper, Arvin M Gouw, Ramani Dinavahi, Anirban Maitra, Lorraine M Deck, Robert E Royer, David L Vander Jagt, Gregg L Semenza, Chi V Dang
• Journal: Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 107 Issue 5 Pg. 2037-42 (Feb 02 2010) ISSN: 1091-6490 [Electronic] United States
• PMID: 20133848 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)

Chemical References

• 3-dihydroxy-6-methyl-7-(phenylmethyl)-4-propylnaphthalene-1-carboxylic acid
• Antioxidants
• Enzyme Inhibitors
• Isoenzymes
• Naphthalenes
• RNA, Small Interfering
• Adenosine Triphosphate
• L-Lactate Dehydrogenase
• Lactate Dehydrogenase 5
• Acetylcysteine

Topics

• Acetylcysteine (pharmacology)
• Adenosine Triphosphate (metabolism)
• Animals
• Antioxidants (pharmacology)
• Cell Death (drug effects)
• Cell Line, Tumor
• Energy Metabolism (drug effects)
• Enzyme Inhibitors (pharmacology)
• Female
• Glycolysis (drug effects)
• Humans
• Isoenzymes (antagonists & inhibitors, genetics)
• L-Lactate Dehydrogenase (antagonists & inhibitors, genetics)
• Lactate Dehydrogenase 5
• Male
• Mice
• Mice, Nude
• Mice, SCID
• Naphthalenes (pharmacology)
• Neoplasm Transplantation
• Neoplasms, Experimental (drug therapy, genetics, metabolism, pathology)
• Oxidative Stress (drug effects)
• RNA, Small Interfering (genetics)
• Transplantation, Heterologous