Abstract: We report the development of a new microwave-based synthetic methodology mediated by Woollins’ reagent that allowed an efficient conversion of caffeine into 6-selenocaffeine. A preliminary evaluation on the modulation of antioxidant activity upon selenation of caffeine, using the DPPH assay, indicated a mild antioxidant activity for 6-selenocaffeine, contrasting with caffeine, that exhibited no antioxidant activity under the same experimental conditions. Interestingly, whereas 6-selenocaffeine has revealed to have a low cytotoxic potential in both MCF10A and MCF-7 breast cells (24 h, up to 100 µM, MTT assay), a differential effect was observed when used in combination with the anticancer agents doxorubicin and oxaliplatin in MCF-7 breast cancer cells. The co-treatment of doxorubicin (1 µM) and 6-selenocaffeine (100 µM) resulted in a slight decrease in cellular viability when compared to doxorubicin (1 µM) alone. Conversely, the seleno-caffeine derivative at the same concentration markedly increased the viability of oxaliplatin (100 µM)-treated cells (p < 0.01). Overall, this work highlights an emerging methodology to synthesize organoselenium compounds and points out the differential roles of 6-selenocaffeine in the modulation of the cytotoxicity of anticancer agents.
Keywords: organoselenium compounds; caffeine; modulator of the cytoxicity; oxaliplatin; doxorubicin; cancer therapy
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Martins, I.L.; Miranda, J.P.; Oliveira, N.G.; Fernandes, A.S.; Gonçalves, S.; Antunes, A.M.M. Synthesis and Biological Activity of 6-Selenocaffeine: Potential Modulator of Chemotherapeutic Drugs in Breast Cancer Cells. Molecules 2013, 18, 5251-5264.
Martins IL, Miranda JP, Oliveira NG, Fernandes AS, Gonçalves S, Antunes AMM. Synthesis and Biological Activity of 6-Selenocaffeine: Potential Modulator of Chemotherapeutic Drugs in Breast Cancer Cells. Molecules. 2013; 18(5):5251-5264.
Martins, Inês L.; Miranda, Joana P.; Oliveira, Nuno G.; Fernandes, Ana S.; Gonçalves, Sandrina; Antunes, Alexandra M.M. 2013. "Synthesis and Biological Activity of 6-Selenocaffeine: Potential Modulator of Chemotherapeutic Drugs in Breast Cancer Cells." Molecules 18, no. 5: 5251-5264.