Isolation, identification, and quantification of Pentylcurcumene from Geophila repens: A new class of cholinesterase inhibitor for Alzheimer's disease.
Bioorg Chem
; 88: 102947, 2019 07.
Article
em En
| MEDLINE
| ID: mdl-31028989
ABSTRACT
The aerial part of Geophila repens (L.) I.M. Johnst (Rubiaceae) has been used in India to improve intelligence and memory for a long time. As part of our ongoing efforts in discovering potential bioactive compounds from G. repens, we have studied the isolation, identification, and quantification of a new class of cholinesterase inhibitor from G. repens for Alzheimer's disease (AD). Terpene was isolated from hydroalcohol extract of G. repens (GRHA) and its structure was identified "Pentylcurcumene" by spectroscopic data. HPTLC fingerprint analysis was performed and good separation was achieved in mobile phase (benzenemethanol; 7.52.5, v/v, 254 and 366â¯nm; Rf 0.51). The method was validated using ICH guidelines in terms of linearity, specificity, sensitivity, accuracy, precision, robustness and stability. In cellular antioxidant studies e.g. DPPH, oxygen-radical-absorbance-capacity (ORAC) and cell-based-antioxidant-protection-in-erythrocytes (CAP-e) assays showed that, Pentylcurcumene showed remarkably different degrees of antioxidant activities in dose-dependent manner. Pentylcurcumene demonstrated anticholinesterase activities e.g. IC50 of acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) inhibition were 73.12⯱â¯0.56 and 97.65⯱â¯0.46⯵g/ml, respectively. To better understand enzyme kinetics, Lineweaver-Burk plot of Pentylcurcumene displayed the highest affinity with competitive inhibition (reversible) towards both AChE (Vmax 0.8) and BChE (Vmax 0.6). An improved and advanced HPTLC tool of bioautography detection of Pentylcurcumene has been successfully demonstrated its anticholinesterase activities. Molecular docking simulations of Pentylcurcumene (ligand) and enzymes (proteins) exhibited the binding of ligand at active sites of AChE (human/rat) and BChE (human/homology) efficiently and also predicted the hydrophobic interaction of drug towards different amino acid residue within proteins. As per the results of antioxidant study and with the support of molecular docking analysis, it is concluded that Pentylcurcumene could be a potential first-line cholinesterase-inhibitor for AD.
Palavras-chave
2,2-diphenyl-1-picrylhydrazyl (PubChem CID: 74358); 2,2'-azobis (2-amidino-propane) dihydrochloride (PubChem CID: 84924); 2',7'-dichlorofluorescin diacetate (PubChem CID: 77718); 5,5'-dithio-bis-(2-nitrobenzoic acid) (PubChem CID: 6254); Acetylcholinesterase; Acetylcholinesterase (PubChem SID: 318693250); Acetylthiocholine iodide (PubChem CID: 74629); Alzheimer's disease; Bioautography; Butyrylcholinesterase; CAP-e; Fluorescein Sodium Salt (PubChem SID: 24894907); Geophila repens; HPTLC; Molecular docking; ORAC; Pentylcurcumene; Pentylcurcumene (PubChem CID: 91710308); S-butyrylthiocholine chloride (PubChem CID: 3015121)
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Extratos Vegetais
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Inibidores da Colinesterase
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Rubiaceae
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Curcumina
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Doença de Alzheimer
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Antioxidantes
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Animals
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Humans
Idioma:
En
Revista:
Bioorg Chem
Ano de publicação:
2019
Tipo de documento:
Article