Percorrer por autor "Elhawary, Esraa A."
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- Comprehensive chemical and biological assessment of Orobanche racemosa extracts using chromatographic, in vitro, in silico, and cell‐based techniquesPublication . Nilofar, Nilofar; Saka, Enver; Cetiz, Mehmet Veysi; Rodrigues, Maria João; Fernandes, Eliana; Custódio, Luísa; Yildiztugay, Evren; Yapıcı, Ismail; Gulcin, Ilhami; Elhawary, Esraa A.; Eldahshan, Omayma A.; Singab, Abdel Nasser B.; Cespedes‐Acuna, Carlos L.; Zengin, GokhanThe growing interest in natural product research as a safer and sustainable alternative to synthetic drugs has triggered this study,which evaluates the chemical profile and biological activity of Orobanche racemosa extracts. In the current study, extraction wasperformed from O. racemosa using the maceration method with several extraction solvents. The extracts were examined for theirantioxidant and enzyme-inhibitory activities and their effects on cell viability. In high-performance liquid chromatography–MS/MS analysis, a total of 31 compounds was detected across all studied extracts. The EtOH and EtOH/water extracts consistentlyexhibited the highest antioxidant capacities in almost all tested assays. Similarly, EtOH and EtOH/water extracts showed vigorousanti-AChE activity, measuring 2.88 and 2.35 mg/GALAE, respectively. In the cell viability assay, both EA and EtOH extracts ofO. racemosa demonstrated potent cytotoxicity, significantly reducing viability in normal (HEK293) and cancer cell lines (HepG2,SH-SY5Y), indicating high toxicity without selectivity. Molecular docking screened 384 theoretical compound–target combina-tions and retained 251 unique complexes with docking scores of −7.0 kcal/mol or lower after duplicated entries were removed. Subsequent single-trajectory molecular dynamics analysis of seven representative high-scoring complexes generated hypotheses regarding structural persistence under the simulated conditions; however, these computational predictions require experimental validation
- Functional constituents of Colchicum lingulatum Boiss. & Spruner subsp. Rigescens K. Perss. Extracts and their biological activities with different perspectivesPublication . Yagi, Sakina; Zengin, Gokhan; Eldahshan, Omayma A.; Singab, Abdel Nasser B.; Selvi, Selami; Cetiz, Mehmet Veysi; Rodrigues, Maria João; Custódio, Luísa; Dall’Acqua, Stefano; Elhawary, Esraa A.The genus Colchicum comprises medicinal plants with important bioactive alkaloids, mainly colchicine, and phenolics. The present study was aimed to determine for the first time the phytoconstituents, antioxidant, enzyme inhibition and cytotoxic properties of corms of C. lingulatum. Different solvents extracts (hexane, ethyl acetate, methanol and water) were obtained. The extracts were examined for chemical characterization, antioxidant, enzyme inhibition and cytotoxic properties. To gain more insights, in silico and network pharmacological analysis were performed. Results of GC/MS analysis of the hexane extract revealed that the extract was dominated by oxygenated diterpenes (37%). UHPLC/MS analysis of ethyl acetate, methanol and aqueous extracts indicated the presence of flavonoids as the most abundant class in addition to phenolic acids and alkaloids. The alkaloid colchicine together with its derivatives colchiceine, colchiciline and isomers were detected in the methanol and aqueous extracts. Results of antioxidant activity showed that the methanol extract exhibited the highest DPPH radical scavenging. At 100 mu g/mL, the ethyl acetate, methanol and aqueous extracts displayed potent cytotoxicity against the human embryonic (HEK 293), murine macrophages (RAW 264.7). In silico analyzes have investigated the potential of C. lingulatum in cancer therapy using network pharmacology and molecular docking methods. These results demonstrate C. lingulatum can be a valuable source of bioactive compounds in the development of functional applications including nutraceuticals.