title: Sesquiterpene Lactones from Cynara cornigera: Acetyl Cholinesterase Inhibition and In Silico Ligand Docking.
abstract: Wild artichoke (Cynara cornigera), a thistle-like perennial belonging to the Asteraceae family, is native to the Mediterranean region, northwestern Africa, and the Canary Islands. While the pleasant, albeit bitter, taste of the leaves and flowers is attributed to the sesquiterpene lactones cynaropicrin and cynarin, a comprehensive phytochemical investigation still needs to be reported. In this study seven sesquiterpene lactones were isolated from an aqueous methanol plant extract, including a new halogenated metabolite (1), the naturally isolated compound sibthorpine (2), and five metabolites isolated for the first time from C. cornigera. Structures were established by spectroscopic methods, including HREIMS, (1 )H, (13 )C, DEPT, (1 )H-(1 )H COSY, HMQC, and HMBC-NMR experiments as well as by X-ray analysis. The isolated bioactive nutrients were analyzed for their antioxidant and metal chelating activity. Compound 1 exhibited a potent metal chelating activity as well as a high antioxidant capacity. Moreover, select compounds were effective as acetyl cholinesterase inhibitors presenting the possibility for such compounds to be examined for anti-neurodegenerative activity. A computational pharmacophore elucidation and docking study was performed to estimate the pharmacophoric features and binding conformation of isolated compounds in the acetyl cholinesterase active site.
authors.affiliation: Phytochemistry Department, National Research Centre, Giza, Egypt.
authors.forename: Mohamed-Elamir F
authors.initials: ME
authors.lastname: Hegazy
authors.affiliation: Medicinal and Aromatic Plants Researches Department, Pharmaceutical and Drug Industries Researches Division, National Research Centre, Giza, Egypt.
authors.forename: Abeer Y
authors.initials: AY
authors.lastname: Ibrahim
authors.affiliation: Phytochemistry Department, National Research Centre, Giza, Egypt.
authors.forename: Tarik A
authors.initials: TA
authors.lastname: Mohamed
authors.affiliation: Phytochemistry Department, National Research Centre, Giza, Egypt.
authors.forename: Abdelaaty A
authors.initials: AA
authors.lastname: Shahat
authors.affiliation: Faculty of Pharmacy, King Abdulaziz University, Jeddah, Saudi Arabia.
authors.forename: Ali M
authors.initials: AM
authors.lastname: El Halawany
authors.affiliation: Phytochemistry Department, National Research Centre, Giza, Egypt.
authors.forename: Nahla S
authors.initials: NS
authors.lastname: Abdel-Azim
authors.affiliation: Pharmacognosy Department, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia.
authors.forename: Mansour S
authors.initials: MS
authors.lastname: Alsaid
authors.affiliation: Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA.
authors.forename: Paul W
authors.initials: PW
authors.lastname: Paré
mesh_terms: D000349:Africa; D000975:Antioxidants / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry; D002800:Cholinesterase Inhibitors / Q000737:chemistry* / Q000302:isolation & purification; D018360:Crystallography, X-Ray; D031942:Cynara / Q000737:chemistry*; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification; D007783:Lactones / Q000737:chemistry* / Q000302:isolation & purification; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D012717:Sesquiterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000975:Antioxidants; D002614:Chelating Agents; D002800:Cholinesterase Inhibitors; D016166:Free Radical Scavengers; D007783:Lactones; D010936:Plant Extracts; D012717:Sesquiterpenes; C075687:cynaropicrin