Open Access
Seleno-warfare against cancer: decoding antitumor activity of novel acylselenoureas and se-acylisoselenoureas
(MDPI, 2024) Angulo-Elizari, Eduardo; Raza, Asif; Encío Martínez, Ignacio; Sharma, Arun K.; Sanmartín, Carmen; Plano, Daniel; Ciencias de la Salud; Osasun Zientziak; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
Currently, cancer remains a global health problem. Despite the existence of several treatments, including chemotherapy, immunotherapy, and radiation therapy, the survival rate for most cancer patients, particularly those with metastasis, remains unsatisfactory. Thus, there is a continuous need to develop novel, effective therapies. In this work, 22 novel molecules containing selenium are reported, including seven Se-acylisoselenoureas synthesized from aliphatic carbodiimides as well as acylselenoureas with the same carbo- and heterocycles and aliphatic amines. After an initial screening at two doses (50 and 10 µM) in MDA-MB-231 (breast), HTB-54 (lung), DU-145 (prostate), and HCT-116 (colon) tumor cell lines, the ten most active compounds were identified. Additionally, these ten hits were also submitted to the DTP program of the NCI to study their cytotoxicity in a panel of 60 cancer cell lines. Compound 4 was identified as the most potent antiproliferative compound. The results obtained showed that compound 4 presented IC50 values lower than 10 µM in the cancer cell lines, although it was not the most selective one. Furthermore, compound 4 was found to inhibit cell growth and cause cell death by inducing apoptosis partially via ROS production. Overall, our results suggest that compound 4 could be a potential chemotherapeutic drug for different types of cancer.
Open Access
First generation of antioxidant precursors for bioisosteric Se-NSAIDs: design, synthesis, and in vitro and in vivo anticancer evaluation
(MDPI, 2023) Ramos Inza, Sandra; Aliaga, César; Encío Martínez, Ignacio; Raza, Asif; Sharma, Arun K.; Aydillo, Carlos; Martínez-Sáez, Nuria; Sanmartín, Carmen; Plano, Daniel; Ciencias de la Salud; Osasun Zientziak
The introduction of selenium (Se) into organic scaffolds has been demonstrated to be a promising framework in the field of medicinal chemistry. A novel design of nonsteroidal anti-inflammatory drug (NSAID) derivatives based on a bioisosteric replacement via the incorporation of Se as diacyl diselenide is reported. The antioxidant activity was assessed using the DPPH radical scavenging assay. The new Se-NSAID derivatives bearing this unique combination showed antioxidant activity in a time- and dose-dependent manner, and also displayed different antiproliferative profiles in a panel of eight cancer cell lines as determined by the MTT assay. Ibuprofen derivative 5 was not only the most antioxidant agent, but also selectively induced toxicity in all the cancer cell lines tested (IC50 < 10 µM) while sparing nonmalignant cells, and induced apoptosis partially without enhancing the caspase 3/7 activity. Furthermore, NSAID derivative 5 significantly suppressed tumor growth in a subcutaneous colon cancer xenograft mouse model (10 mg/kg, TGI = 72%, and T/C = 38%) without exhibiting any apparent toxicity. To our knowledge, this work constitutes the first report on in vitro and in vivo anticancer activity of an unprecedented Se-NSAID hybrid derivative and its rational use for developing precursors for bioisosteric selenocompounds with appealing therapeutic applications.
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 Zientziak
Aspirin (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.
Open Access
Novel acylselenourea derivatives: dual molecules with anticancer and radical scavenging activity
(MDPI, 2023) Astráin-Redín, Nora; Raza, Asif; Encío Martínez, Ignacio; Sharma, Arun K.; Plano, Daniel; Sanmartín, Carmen; Ciencias de la Salud; Osasun Zientziak
Oxidative stress surrounding cancer cells provides them with certain growth and survival advantages necessary for disease progression. In this context, Se-containing molecules have gained attention due to their anticancer and antioxidant activity. In our previous work, we synthesized a library of 39 selenoesters containing functional groups commonly present in natural products (NP), which showed potent anticancer activity, but did not demonstrate high radical scavenger activity. Thus, 20 novel Se derivatives resembling NP have been synthesized presenting acylselenourea functionality in their structures. Radical scavenger activity was tested using DPPH assay and in vitro protective effects against ROS-induced cell death caused by H2O2. Additionally, antiproliferative activity was evaluated in prostate, colon, lung, and breast cancer cell lines, along with their ability to induce apoptosis. Compounds 1.I and 5.I showed potent cytotoxicity against the tested cancer cell lines, along with high selectivity indexes and induction of caspase-mediated apoptosis. These compounds exhibited potent and concentration-dependent radical scavenging activity achieving DPPH inhibition similar to ascorbic acid and trolox. To conclude, we have demonstrated that the introduction of Se in the form of acylselenourea into small molecules provides strong radical scavengers in vitro and antiproliferative activity, which may lead to the development of promising dual compounds.
Open Access
Design, synthesis and anticancer evaluation of novel Se-NSAID hybrid molecules: identification of a Se-indomethacin analog as a potential therapeutic for breast cancer
(Elsevier, 2022) Ramos Inza, Sandra; Encío Martínez, Ignacio; Raza, Asif; Sharma, Arun K.; Sanmartín, Carmen; Plano, Daniel; Ciencias de la Salud; Osasun Zientziak; Institute for Multidisciplinary Research in Applied Biology - IMAB
A total of twenty-five novel carboxylic acid, methylester, methylamide or cyano nonsteroidal anti-inflammatory drug (NSAID) derivatives incorporating Se in the chemical form of selenoester were reported. Twenty Se-NSAID analogs exhibited an increase in cytotoxic potency compared with parent NSAID scaffolds (aspirin, salicylic acid, naproxen, indomethacin and ketoprofen). Top five analogs were selected to further study their cytotoxicity in a larger panel of cancer cells and were also submitted to the DTP program of the NCI's panel of 60 cancer cell lines. Compounds 4a and 4d stood out with IC50 values below 10 μM in several cancer cells along with a selectivity index higher than 5 in breast cancer cells. Remarkably, analog 4d was found to inhibit cell growth notably in two breast cancer cell lines by inducing apoptosis, and to be metabolized to release the parent NSAID along with the Se fragment. Taken together, our results show that Se-NSAID analog 4d could be a potential chemotherapeutic drug for breast cancer.
Open Access
Seleno-analogs of scaffolds resembling natural products a novel warhead toward dual compounds
(MDPI, 2023) Astráin-Redín, Nora; Talavera, Irene; Moreno, Esther; Ramírez, María J.; Martínez-Sáez, Nuria; Encío Martínez, Ignacio; Sharma, Arun K.; Sanmartín, Carmen; Plano, Daniel; Osasun Zientziak; Institute for Multidisciplinary Research in Applied Biology - IMAB; Ciencias de la Salud
Nowadays, oxidative cell damage is one of the common features of cancer and Alzheimer’s disease (AD), and Se-containing molecules, such as ebselen, which has demonstrated strong antioxidant activity, have demonstrated well-established preventive effects against both diseases. In this study, a total of 39 Se-derivatives were synthesized, purified, and spectroscopically characterized by NMR. Antioxidant ability was tested using the DPPH assay, while antiproliferative activity was screened in breast, lung, prostate, and colorectal cancer cell lines. In addition, as a first approach to evaluate their potential anti-Alzheimer activity, the in vitro acetylcholinesterase inhibition (AChEI) was tested. Regarding antioxidant properties, compound 13a showed concentration- and time-dependent radical scavenging activity. Additionally, compounds 14a and 17a showed high activity in the melanoma and ovarian cancer cell lines, with LD50 values below 9.2 µM. Interestingly, in the AChEI test, compound 14a showed almost identical inhibitory activity to galantamine along with a 3-fold higher in vitro BBB permeation (Pe = 36.92 × 10−6 cm/s). Molecular dynamics simulations of the aspirin derivatives (14a and 14b) confirm the importance of the allylic group instead of the propargyl one. Altogether, it is concluded that some of these newly synthesized Se-derivatives, such as 14a, might become very promising candidates to treat both cancer and AD.
Open Access
Novel selenadiazole derivatives as selective antitumor and radical scavenging agents
(Elsevier, 2018) Ruberte, Ana Carolina; Plano, Daniel; Encío Martínez, Ignacio; Aydillo, Carlos; Sharma, Arun K.; Sanmartín, Carmen; Ciencias de la Salud; Osasun Zientziak
Twenty-seven novel benzo[c][1,2,5]selenadiazole-5-carboxylic acid (BSCA) derivatives were designed and synthesized. Anti-proliferative activity of these structures was tested in vitro against a panel of five human cancer cell lines, including prostate (PC-3), colon (HT-29), leukemia (CCRF-CEM), lung (HTB-54) and breast (MCF-7). Four compounds (5, 6, 7 and 19) showed potent inhibitory activity with GI(50) values below 10 mu M in at least one of the cancer cell lines. The selectivity of these compounds was further examined in two non-malignant cell lines derived from breast (18465) and lung (BEAS-2B). Compound 7 exhibited promising anti-proliferative activity (GI(50) = 3.7 mu M) in MCF-7 cells, together with high selectivity index (SI> 27.1). The induction of cell death by compound 7 was independent of the apoptotic process and it did not affect cell cycle progression either. Likewise, radical scavenging properties of the new selenadiazole derivatives were confirmed by testing their ability to scavenge DPPH radicals. Four compounds (1, 2, 8 and 9) showed potent radical scavenging activity, compound 9 being the most effective. Overall, while compound 7 was identified as the most cell growth inhibitory agent and selectively toxic to cancer cells, compound 9 proved to be the most potent antioxidant among the selenadiazole derivatives synthesized. This series of compounds can serve as an excellent scaffold to achieve new and potent antioxidant compounds useful for several diseases, i.e. cancer, neurodegenerative, heart diseases and leishmaniasis, considering the high radical scavenging activity and low toxicity showed by most of the compounds.