Screening of the antileishmanial and antiplasmodial potential of synthetic 2-arylquinoline analogs.

In this study, six analogs of 2-arylquinoline were synthesized and evaluated for their in vitro and in vivo antiplasmodial and leishmanicidal activity. At a later stage, hemolytic activity and druggability were tested in vitro and in silico, respectively, observing as a result: firstly, compounds showed half-maximal effective concentration (EC50) values between 3.6 and 19.3 µM. Likewise, a treatment using the compounds 4a-f caused improvement in most of the treated hamsters and cured some of them. Regarding the antiplasmodial activity, the compounds showed moderate to high activity, although they did not show hemolytic activity. Furthermore, 4e and 4f compounds were not able to control P. berghei infection when administered to animal models. Molecular dynamic simulations, molecular docking and ligand binding affinity indicate good characteristics of the studied compounds, which are expected to be active. And lastly, the compounds are absorbable at the hematoencephalic barrier but not in the gastrointestinal tract. In summary, ADMET properties suggest that these molecules may be used as a safe treatment against Leishmania.

Estudio fitoquímico y evaluación de la actividad antioxidante de Esenbeckia litoralis Donn.Sm. (Loro grande) / Phytochemical study and evaluation of the antioxidant activity of Esenbeckia litoralis Donn. Sm. (loro)

Introducción: la especie Esenbeckia litoralis Donn.Sm. (Rutaceae) es también conocida como Loro o Loro grande, ha sido empleado en la medicina tradicional para el tratamiento de mordeduras de serpientes, dolor de garganta y lesiones ocasionadas por picaduras de insectos. Esta variedad de actividades son causadas por acción de los compuestos que la constituyen, como lignanos, terpenos, alcaloides, cumarinas y polifenoles que representan un alto potencial farmacológico para esta especie. Objetivo: realizar el estudio fitoquímico y evaluación de la actividad antioxidante de la especie E. litoralis. Métodos: los extractos vegetales de hojas corteza y madera se obtuvieron empleando etanol al 96 por ciento, y posteriormente fueron fraccionados usando técnicas cromatográficas como Cromatografía en Capa Delgada (CCD), Cromatografía en Columna (CC) y Cromatografía en Capa Delgada Preparativa (CCDP). Los compuestos se identificaron mediante el análisis de datos espectroscópicos con el empleo de técnicas instrumentales como: Infrarrojo (IR), Resonancia Magnética Nuclear Protónica y de Carbono trece (RMN-1H y 13C), Espectrometría de Masas (EM) y difracción de rayos x (DRX). La actividad antioxidante se evaluó a través de los métodos radical catiónico ABTS•+, radical libre DPPH• y Potencial de Actividad de Reducción Férrica (FRAP). Resultados: de esta especie se aislaron e identificaron cinco compuestos: cuatro alcaloides y un flavonoide. Los extractos en acetato de etilo de hojas y corteza mostraron una significativa actividad frente a los radicales ABTS•+ con un IC50 de 5,65 y 7,65 µg/mL respectivamente. Conclusiones: de los distintos extractos se aislaron cinco compuestos: 1-hidroxi-3-metoxi-N-metilacridona (1), maculosidina (2) maculina (3), dictamina (4) y gardenina B (5). El extracto en acetato de etilo de hojas y corteza presentaron una significativa actividad antioxidante frente al radical ABTS con un IC50 de 5,65 y 7,65 mg/L, respectivamente(AU)

Introduction: The species Esenbeckia litoralis Donn. Sm. (Rutaceae), also known as loro or loro grande, has been used in traditional medicine to treat snakebites, sore throats and lesions caused by insect bites. The compounds contained in the plant, among them lignans, terpenes, alkaloids, coumarins and polyphenols, are responsible for such a broad variety of activities, granting it great pharmacological potential. Objective: Conduct a phytochemical study and evaluation of the antioxidant activity of the species E. litoralis. Methods: Plant extracts from leaves, stem and wood were obtained using 96 percent ethanol, and then fractioned with chromatographic techniques such as thin-layer chromatography (TLC), column chromatography (CC) and preparative thin-layer chromatography (PTLC). The compounds were identified by spectroscopic data analysis using instrumental techniques such as infrared (IR) spectroscopy, proton and Carbon-13 nuclear magnetic resonance (NMR-1H and 13C), mass spectrometry (MS) and X-ray diffraction (XRD). Antioxidant activity was evaluated with the methods ABTSo+ radical cation, DPPHo free radical and ferric reducing ability power (FRAP). Results: Five compounds were isolated from the species: four alkaloids and one flavonoid. Ethyl acetate extracts from leaves and stem displayed significant activity against ABTSo+ radicals, with a CI50 of 5.65 and 7.65 µg/ml, respectively. Conclusions: Five compounds were isolated from the various extracts: 1-hydroxy-3-methoxy-N-methylacridone (1), maculosidin (2), maculin (3), dictamin (4) and gardenin B (5). The leaf and stem extract in ethyl acetate displayed significant antioxidant activity against the ABTS radical, with a CI50 of 5.65 and 7.65 mg/l, respectively(AU)