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Title3-bromopyruvate, butyrate, monocarboxylate transporters, warburg effect
Author(s)Queirós, Odília
Preto, Ana
Pacheco, António
Pinheiro, Céline
Silva, João Azevedo
Moreira, Roxana
Pedro, Madalena
Ko, Young
Pedersen, Peter
Baltazar, Fátima
Casal, Margarida
Monocarboxylate transporters
Warburg effect
Issue dateFeb-2012
JournalJournal of Biomembranes and Bioenergetics
Abstract(s)Most malignant tumors exhibit theWarburg effect, which consists in increased glycolysis rates with production of lactate, even in the presence of oxygen. Monocarboxylate transporters (MCTs), maintain these glycolytic rates, by mediating the influx and/or efflux of lactate and are overexpressed in several cancer cell types. The lactate and pyruvate analogue 3-bromopyruvate (3-BP) is an inhibitor of the energy metabolism, which has been proposed as a specific antitumor agent. In the present study, we aimed at determining the effect of 3-BP in breast cancer cells and evaluated the putative role of MCTs on this effect. Our results showed that the three breast cancer cell lines used presented different sensitivities to 3-BP: ZR-75-1 ER (+)>MCF-7 ER (+)>SK-BR-3 ER (−).We also demonstrated that 3-BP reduced lactate production, induced cell morphological alterations and increased apoptosis. The effect of 3-BP appears to be cytotoxic rather than cytostatic, as a continued decrease in cell viability was observed after removal of 3-BP. We showed that pre-incubation with butyrate enhanced significantly 3-BP cytotoxicity, especially in the most resistant breast cancer cell line, SK-BR-3. We observed that butyrate treatment induced localization of MCT1 in the plasma membrane as well as overexpression of MCT4 and its chaperone CD147. Our results thus indicate that butyrate pre-treatment potentiates the effect of 3-BP, most probably by increasing the rates of 3-BP transport through MCT1/4. This study supports the potential use of butyrate as adjuvant of 3-BP in the treatment of breast cancer resistant cells, namely ER (−).
DescriptionThe authors are deeply grateful to Professor André Goffeau (Université Catholique de Louvain-la-Neuve, Belgium) for his contagious vision, valuable discussions at the Conference on 3-BP held in Brussels, 29 October–2 November, 2011 and critical reviewing of the manuscript. The authors also thank Dr. Rita Reis for her technical support in microscopy and image analysis.
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Appears in Collections:ICVS - Artigos em Revistas Internacionais com Referee

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