Encío Martínez, Ignacio
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Encío Martínez
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Ignacio
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Ciencias de la Salud
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IMAB. Research Institute for Multidisciplinary Applied Biology
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Publication Open Access New formulation of a methylseleno-aspirin analog with anticancer activity towards colon cancer(MDPI, 2020) Ruberte, Ana Carolina; González Gaitano, Gustavo; Sharma, Arun K.; Aydillo, Carlos; Encío Martínez, Ignacio; Sanmartín, Carmen; Plano, Daniel; Ciencias de la Salud; Osasun ZientziakAspirin (ASA) has attracted wide interest of numerous scientists worldwide thanks to its chemopreventive and chemotherapeutic effects, particularly in colorectal cancer (CRC). Incorporation of selenium (Se) atom into ASA has greatly increased their anti-tumoral efficacy in CRC compared with the organic counterparts without the Se functionality, such as the promising antitumoral methylseleno-ASA analog (1a). Nevertheless, the efficacy of compound 1a in cancer cells is compromised due to its poor solubility and volatile nature. Thus, 1a has been formulated with native α-, β-and γ-cyclodextrin (CD), a modified β-CD (hydroxypropyl β-CD, HP-β-CD) and Pluronic F127, all of them non-toxic, biodegradable and FDA approved. Water solubility of 1a is enhanced with β-and HP-β-CDs and Pluronic F127. Compound 1a forms inclusion complexes with the CDs and was incorporated in the hydrophobic core of the F127 micelles. Herein, we evaluated the cytotoxic potential of 1a, alone or formulated with β-and HP-β-CDs or Pluronic F127, against CRC cells. Remarkably, 1a formulations demonstrated more sustained antitumoral activity toward CRC cells. Hence, β-CD, HP-β-CD and Pluronic F127 might be excellent vehicles to improve pharmacological properties of organoselenium compounds with solubility issues and volatile nature.Publication Open Access Novel N,N′-disubstituted acylselenoureas as potential antioxidant and cytotoxic agents(MDPI, 2020) Ruberte, Ana Carolina; Ramos Inza, Sandra; Aydillo, Carlos; Talavera, Irene; Encío Martínez, Ignacio; Plano, Daniel; Sanmartín, Carmen; Ciencias de la Salud; Osasun ZientziakSelenium compounds are pivotal in medicinal chemistry for their antitumoral and antioxidant properties. Forty seven acylselenoureas have been designed and synthesized following a fragment-based approach. Different scaffolds, including carbo-and hetero-cycles, along with mono-and bi-cyclic moieties, have been linked to the selenium containing skeleton. The dose-and time-dependent radical scavenging activity for all of the compounds were assessed using the in vitro 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) assays. Some of them showed a greater radical scavenging capacity at low doses and shorter times than ascorbic acid. Therefore, four compounds were evaluated to test their protective effects against H2O2-induced oxidative stress. One derivative protected cells against H2O2-induced damage, increasing cell survival by up to 3.6-fold. Additionally, in vitro cytotoxic activity of all compounds was screened against several cancer cells. Eight compounds were selected to determine their half maximal inhibitory concentration (IC50) values towards breast and lung cancer cells, along with their selectivity indexes. The breast cancer cells turned out to be much more sensitive than the lung. Two compounds (5d and 10a) stood out with IC50 values between 4.2 µM and 8.0 µM towards MCF-7 and T47D cells, with selectivity indexes greater than 22.9. In addition, compound 10b exhibited dual antioxidant and cytotoxic activities. Although further evidence is needed, the acylselenourea scaffold could be a feasible frame to develop new dual agents.