期刊
EXPERT OPINION ON THERAPEUTIC TARGETS
卷 19, 期 6, 页码 733-745出版社
TAYLOR & FRANCIS LTD
DOI: 10.1517/14728222.2015.1045416
关键词
dichloroacetate; melanoma; metabolism; mTOR; pyruvate dehydrogenase kinase
资金
- Portuguese Foundation for Science and Technology [SFRH/BPD/85249/2012]
- Programa Operacional Regional do Norte (ON.2 - O Novo Norte) under the Quadro de Referencia Estrategico Nacional (QREN)
- Fundo Europeu de Desenvolvimento Regional (FEDER)
- FCT, the Portuguese Foundation for Science and Technology
- FEDER funds through the Operational Programme for Competitiveness Factors - COMPETE
- National Funds through the FCT [PEst-C/SAU/LA0003/2013]
Objective: We aimed to verify if there is evidence to consider dichloroacetate (DCA), which inhibits the pyruvate dehydrogenase kinase (PDK) and reverts the metabolic shift of cancer cells from glycolysis to oxidative phosphorylation, as a promising drug for therapy of cutaneous melanoma (CM) patients. Research design and methods: We assessed the expression profile of PDK 1, 2 and 3 in a series of melanoma samples, to verify if melanoma tumors express the DCA targets, if this expression correlates with the activation of important signaling cascades for melanomagenesis and also with the prognosis of melanoma patients. We also established the sensitivity of melanoma cell lines to DCA treatment, by assessing their metabolic alterations, proliferation and survival. Results: We observed that both PDK 1 and 2 isoforms are overexpressed in CM compared to nevi, this expression being associated with the expression of the mTOR pathway effectors and independent of the BRAF mutational status. Melanoma cell lines treated with DCA showed a shift in metabolism, that is, a decrease in glucose consumption and lactate production, downregulation of proliferation, an increase of apoptosis and a decrease in mTOR pathway activation. Conclusion: Our results suggest that PDK expression may play a role in melanoma development and that DCA can be useful for CM therapy, alone or in combination with mTOR inhibitors.
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