Advanced cancers: eradication in all cases using 3-bromopyruvate therapy to deplete ATP,☆☆

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Abstract

A common feature of many advanced cancers is their enhanced capacity to metabolize glucose to lactic acid. In a challenging study designed to assess whether such cancers can be debilitated, we seeded hepatocellular carcinoma cells expressing the highly glycolytic phenotype into two different locations of young rats. Advanced cancers (2–3 cm) developed and were treated with the alkylating agent 3-bromopyruvate, a lactate/pyruvate analog shown here to selectively deplete ATP and induce cell death. In all 19 treated animals advanced cancers were eradicated without apparent toxicity or recurrence. These findings attest to the feasibility of completely destroying advanced, highly glycolytic cancers.

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Materials and methods

Cell source, passage, culture, and viability or ATP content ±3-BrPA. A highly glycolytic hepatocellular carcinoma (HCC) line “AS-30D” [7], [8] was used and maintained (Fig. 1A) in female Sprague–Dawley rats (Charles River). For culture, cells (∼1 × 106) were seeded on a six-well plate in 2 ml RPMI 1640 medium (Invitrogen) containing 10% fetal bovine serum plus 1× antibiotic–antimycotic mixture (Invitrogen) at 37 °C for 3 h in a CO2 incubator. Hepatocytes (∼ 1.5 × 106) were fresh from Cambrex. Cell

The chemical agent 3-BrPA depletes ATP stores and inhibits HCC cell viability

For therapy, we selected the alkylating agent 3-BrPA [13]. This was based on the hypothesis that because of its structural similarity to lactate (Fig. 1B), the reactive 3-BrPA may enter cancer cells on the same transporter that exports lactate and then induce ATP depletion. Although earlier work [14], [15] showed that 3-BrPA inhibits in vitro the cell’s two ATP producing systems, glycolysis and mitochondria, and has antitumor activity, the most critical support for the above hypothesis is

Acknowledgments

Drs. Paul Talalay and Donald Coffey are acknowledged for valuable discussions and James Fox and David Blum for technical assistance. Y.H.K. is grateful also to Ilona McClintick and Dr. Ann Morrill for encouragement.

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This work was supported by start-up funds to Y.H.K. from the Department of Radiology, by NIH Grants CA 10951 and CA 80118 to P.L.P. and Grant CA92871 to M.G.P.

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Abbreviations: 3-BrPA, 3-bromopyruvic acid; HCC, hepatocellular carcinoma; PET, positron emission tomography; FDG, 18F-2-deoxyglucose.

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