Browsing by Author "Mellado, Marco"

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    2D-QSAR and 3D-QSAR/CoMSIA Studies on a Series of (R)-2-((2-(1H-Indol-2-yl)ethyl)amino)-1-Phenylethan-1-ol with Human β₃-Adrenergic Activity
    (2017) Apablaza H., Gastón E.; Montoya, Luisa; Morales Verdejo, César Aarón; Mellado, Marco; Cuellar Fritis, Mauricio Alcides; Lagos, Carlos F.; Soto Delgado, Jorge; Chung, Hery; Pessoa Mahana, Carlos David; Jaime Mella
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    Design of benzimidazoles, benzoxazoles, benzothiazoles and thiazolopyridines as leukotriene A4 hydrolase inhibitors through 3D-QSAR, docking and molecular dynamics
    (2023) Lorca, Marcos; Faundez, Mario; Pessoa-Mahana, C. David; Recabarren-Gajardo, Gonzalo; Diethelm-Varela, Benjamin; Millan, Daniela; Celik, Ismail; Mellado, Marco; Araque, Ileana; Mella, Jaime; Romero-Parra, Javier
    Human leukotriene A4 hydrolase enzyme (LTA4H) catalyses the biotransformation of the inactive precursor leukotriene A4 (LTA4) to the bioactive Leukotriene B4 (LTB4), which causes many inflammatory responses in the human body. Therefore, the selective inhibition of this enzyme becomes a useful strategy for the treatment of several illnesses such as asthma, allergic rhinitis, cardiovascular diseases, and cancer. Herein we report a 3D-QSAR/ /CoMFA and CoMSIA study on a series of 47 benzimidazoles, benzoxazoles, benzothiazoles and thiazolopyridines reported as potent LTA4H inhibitors. Good statistical parameters were obtained for the best model (q2 = 0.568, r2 ncv = 0.891 and r2 test = 0.851). A new series of 10 compounds capable of inhibiting leukotriene A4 hydrolase with high potency was presented. All designed inhibitors showed low IC50 in nano- and sub-nanomolar ranges, when they were evaluated in 3D-QSAR models. Subsequently, the designed molecules, as well as the least and most active compounds were subjected to docking and molecular dynamics studies into LTA4H. In conclusion, we summarised a thorough structure-activity relationship (SAR) of LTA4H inhibitors of heterocyclic structure. These models can be used for the rational proposal of new inhibitors.
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    Hansch’s analysis application to chalcone synthesis by Claisen–Schmidt reaction based in DFT methodology
    (2018) Mellado, Marco; Madrid, Alejandro; Martínez, Úrsula; Mella, Jaime; Salas Sánchez, Cristián Osvaldo; Cuellar Fritis, Mauricio Alcides
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    Organometallic N-acylhydrazones of 5-nitrofuran and 5-nitrothiophene based: Synthesis, electrochemical, antiparasitic evaluation, and computational study
    (2023) Saldias, Marianela; Acuna, Alejandra; Mellado, Marco; Wilkinson, Shane R.; Moncada-Basualto, Mauricio; Artigas, Vania; Fuentealba, Mauricio; Lucero, Andrea; Oyarzo, Juan; Toro, Patricia M.
    In searching for new therapeutic agents for treating American trypanosomiasis and Human African trypanosomiasis, four nitroheterocyclic acylhydrazones of general formulae [R1-CH=N-NH-C(O)-(5-C4H2X)] (where R1 = ferrocenyl or cyrhetrenyl, and X = O or S) have been synthesized and characterized by spectroscopic techniques. Comparative studies of their stability by 1H-NMR and UV-Vis experiments were reported. Single-crystal X-ray diffraction confirmed the molecular structures of NF-1 and NT-2. Their X-ray crystal structures reveal that both adopt an E-configuration on the C=N moiety. Regarding the -NH-C(O)- bond, the structure of NF-1 confirmed a trans conformation, while NT-2 exhibited a cis-amide conformation. The cyclic voltammetry and electron spin resonance (ESR) experiments were conducted to study the electrochemical behavior of N-acylhydrazones. The antiparasitic activities of compounds against Trypanosoma cruzi (epimastigotes) and Trypanosoma brucei (trypomastigotes) revealed that cyrhetrenyl complexes were more effective than their ferrocenyl analogs. The cyrhetrenyl derivative NT-2 (EC50 = 2.25 mu M) showed activity against T. brucei comparable to the standard drug nifurtimox (Nfx, EC50 = 3.56 mu M). The ferrocenyl compound NT-1 (>200 mu M) was at least two times less cytotoxic than the Nfx (88.7 mu M) against the L-6 rat skeletal myoblast cell line and exhibited a selectivity like Nfx toward T. brucei. Density functional theory (DFT) calculations were utilized as an approximation to explain the impact of organometallic and heterocyclic rings on antiparasitic activities. This study supported the experimental results, confirming that the cyrhetrenyl fragment in N-acylhydrazone derivatives plays a significant role in the antitrypanosomal activity, which can be attributed to an increase in positive charge on the metal.
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    Synthesis of chalcones with antiproliferative activity on the SH-SY5Y neuroblastoma cell line : Quantitative Structure-Activity Relationship Models
    (2018) Mellado, Marco; Madrid, Alejandro; Reyna, Mauricio; Weinstein-Oppenheimer, Caroline; Mella, Jaime; Salas Sánchez, Cristián Osvaldo; Sánchez, Elizabeth; Cuellar Fritis, Mauricio Alcides