• The Korea Journal of Herbology
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• 제22권1호
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• pp.7-12
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• 2007

Objectives : In Alzheimer's disease(AD), free radical oxidative stress caused by amyloid beta-peptide may lead to DNA damage, neuronal dysfunction, neurotoxicity and cell death, Hwangryunhaedok-tang(HHT) is traditionally used for the treatment of pyrogenetic diseases. To develop a new anti-AD drug from natural herb, HHT was selected and extracted in this study. Methods : The antioxidant activities of HHT water extract powder were examined by hydroxyl radical-induced DNA strand nicking assay, and antioxidative enzymes expression assay in H4IIE cell. In addition, HHT was examined for the inhibitory effect on the acetylcholinesterase(AChE) using by Ellman's coupled assay. Results: The HHT exhibit DNA protective effect in the hydroxyl radical-induced DNA Strand nicking assay, mRNA expression of superoxide dismutase and glutathione peroxidase were recovered at a normal level by HHT treatment in H4IIE cell. Furthermore, water extract of HHT showed inhibitory effect on AChE activity. Conclusion : These results suggest that HHT may be effective in delaying and preventing AD progression related to the free radical-induced DNA damage and AChE activity.

• Natural Product Sciences
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• 제20권3호
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• pp.191-195
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• 2014

The n-BuOH soluble fraction of the whole plant of Persicaria thungergii showed acetylcholinesterase inhibitory activity. Four flavonoid glycosides and a flavonoid were isolated from this fraction, and identified as quercitrin (1), luteolin-4'-O-${\beta}$-D-glucopyranoside (2), quercetin (3), quercetin-3-O-glucuronide (4), and isorahmnetin-3-O-glucuronid (5), by chromatographed and spectral data, respectively. All isolated compounds were showed acetylcholinesterase inhibitory activity, with $IC_{50}$ values of 243.1, 10.5, 39.1, 8.2 and $23.2{\mu}M$, respectively.

• Fisheries and Aquatic Sciences
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• 제6권4호
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• pp.225-227
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• 2003

Acetylcholinesterase (AChE) activity is a potential biomarker for phenanthrene exposure in aquatic organisms. Olive flounder (Paralichthys olivaceus) were exposed to three different concentrations (0.5, 1.0 and 2.0, uM) of phenanthrene for four weeks. AChE activities in the brain, heart and eyes were documented. Inhibition of AChE activity was found significant in flounder treated with a concentration greater than $1.0 {\mu}M$ of phenanthrene. This indicates that a chronic exposure to phenanthrene induces damage in various organs (brain, heart and eyes) and changes of AChE activities might be a useful biomarker to assess the impacts induced by polycyclic aromatic hydrocarbon (PAH). Evidence from this study confirms that the measurement of AChE in the brain and eyes of flounder is a valuable tool that along with other biomarkers can maximize an ecotoxicologists' confidence in assessing the impacts of oil and PAH pollution in the aquatic environment.

• Food Science and Biotechnology
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• 제18권6호
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• pp.1532-1536
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• 2009

The objective of this study was to evaluate the antioxidant effects and acetylcholinesterase (AChE) inhibition activity of mulberry fruit extracts prepared by hot water (MFH) and 80% ethanol (MFE). Total polyphenolic contents of MFH and MFE were $195{\pm}3.4\;mg$ gallic acid equivalents/g MFH and $185{\pm}2.8\;mg$ gallic acid equivalents/g MFE. MFH and MFE significantly quenched 2,2-diphenyl-1-picrylhydrazyl (DPPH), hydrogen peroxide dose-dependently, and showed high chelating ability and reducing power in non-cellular systems. MFH and MFE also inhibited the formation of intracellular reactive oxygen species and lipid peroxidation, and elevated intracellular glutathione (GSH) levels in RAW264.7 cells. In addition, MFH and MFE also dose-dependently suppressed AChE activity.

• Food Science and Preservation
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• 제23권2호
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• pp.239-245
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• 2016

This study was conducted to compare the functionality (antioxidant, anti-diabetic, and anti-dementia activities) of the methanol extract of Allium hookeri root grown in Korea (KR) and Myanmar (MR). The total polyphenol and flavonoid contents of KR and MR were 5.27 and 4.80 mg GAE/g, and 0.35 and 0.24 mg QE/g, respectively. KR contained significantly higher levels of total polyphenols and total flavonoids than those of MR (p<0.05). The IC50 values of KR and MR were 6.53 and 5.31 mg/mL, respectively, for DPPH radical scavenging activity. However, KR had a significantly higher ABTS radical scavenging activity, $Fe^{2+}$ chelating ability, and reducing power compared with those of MR (p<0.05). In the evaluation of anti-diabetic activity, KR showed significantly higher ${\alpha}-glucosidase$ inhibition activity than acarbose and MR at whole concentrations (p<0.05). KR and MR had acetylcholinesterase inhibition activities that of 51.44% and 44.33%, respectively, at a 50 mg/mL concentration. These results suggested that roots of A. hookeri, especially KR, could be useful in improving diabetic and dementia disorders due to their high antioxidant, anti-diabetic, and anti-dementia activities.

• Journal of Mushroom
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• 제13권3호
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• pp.192-198
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• 2015

This study was performed in order to analyze the fibrinolytic, thrombin inhibitory, anti-oxidative, acetylcholinesterase inhibitory, and immuno-enhancing activities of the water extract and solvent fractions isolated from Grifola frondosa. Fibrinolytic activity was analyzed using the fibrin plate method, and thrombin inhibitory activity was assayed using the substrate H-D-Phe-piparg- pna. Anti-oxidative activity was estimated using the DPPH assay, and AChE inhibitory activity was measured using the spectrophotometric method. Immuno-enhancing activity was examined using the nitric oxide (NO) production in RAW 264.7 macrophage cells. Cell viability was determined using the MTS assay. Fibrinolytic activities were the highest in water extract (1.55 plasmin units/mL) followed by water fraction (0.85 plasmin units/mL). The thrombin inhibitory activities of the water and ethyl acetate fractions were determined to be 76.43% and 72.59%, respectively. The acetylcholinesterase inhibitory activities of chloroform and hexane fractions exhibited values of 95.14% and 94.74%, respectively. The butanol fraction showed the highest anti-oxidative activity at 94.47%. Anti-proliferating activity against Raw 264.7 cells showed no cytotoxicity. The production of NO in Raw 264.7 cells increased up to 2-fold by adding the water fraction compared to the untreated control. These results suggest that Grifola frondosa may serve as a useful functional food for the enhancement of immune function and the prevention and therapy of cardiovascular diseases.

• Korean Journal of Food Science and Technology
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• 제36권6호
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• pp.1026-1031
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• 2004

Acetylcholinesterase inhibitory activity and protective effect against cytotoxicity of PC 12 cell induced by beta-amyloid protein and glutamate were examined in perilla seed methanol extract and its solvent fractions. Methanol extract of perilla seed showed dose-dependent acetylcholinesterase inhibitory activity, with n-butanol fraction showing strongest activity. Perilla seed methanol extract also decreased glutamate- and ${\beta}-amyloid$ protein $(A{\beta})-induced$ cytotoxicities of PC 12 cells dose-dependently. Formation of TBARS induced by $FeSO_{4^-}H_2O_2$ in rat brain was significantly reduced by perilla seed methanol extract, with strongest protective activity formation of TBARS shown in n-butanol fraction. Results suggest perilla seed methanol extract may attenuate actylcholinesterase activity and cytotoxicity induced by glutamate and ${\beta}-amyloid$ protein through suppression of oxidative stress.

• Fisheries and Aquatic Sciences
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• 제7권3호
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• pp.171-173
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• 2004

Activity of acetylcholinesterase (AChE) is well known as a biomarker of exposure to organophosphate compounds in aquatic organisms. However, the effect of diethyl phthalate (DEP), a widely used plasticizer, on the chance of AChE activity is not yet known. Olive flounder (Paralichthys olivaceus) were exposed to DEP 300 and 1,000 mg DEP/kg b.w. through three times of intraperitoneal injection and effects were assessed in AChE activity of brain, muscle, heart and eyes of the exposed fish. AChE activity in various tissues of flounder was inhibited after exposure to DEP as a concentration-dependent manner, especially in brain, muscle and heart. Among tissues examined, heart is supposed to be a major part of body which is seriously damaged by DEP exposure. It indicates that DEP induces toxic effects in various organs (brain, muscle and heart), and changes of AChE activities. Such changed activities of AChE might be a useful biomarker to assess the impacts induced by phthalate esters including DEP.

• The Korean Journal of Mycology
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• 제47권4호
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• pp.337-346
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• 2019

To develop a new antidementia acetycholinesterase (AChE) inhibitor from edible mushrooms, the inhibitory effects on AChE of water and ethanol extracts from various edible mushrooms were measured. Among the tested compounds, 70% ethanol extracts from Tremella fuciformis showed the highest AChE inhibitory activity, at 25.3% (IC₅₀: 9.9 mg). Water extracts from the fruiting body of Pleurotus ostreatus (Heuktari) showed AChE inhibitory activity of 20.2% (IC₅₀: 12.4 mg). However, the yield (40.8%) from Pleurotus ostreatus (Heuktari) was higher than that from Tremella fuciformis (5.0%). Therefore, we selected Pleurotus ostreatus (Heuktari) as the most promising candidate for a mushroom containing anti-dementia AChE inhibitors. The AChE inhibitor from Pleurotus ostreatus (Heuktari) was optimally extracted when its fruiting body was treated with water for 6 h at 30℃. The anti-dementia effects of the partially purified AChE inhibitor from Pleurotus ostreatus (Heuktari) were observed in PC12 nerve cells.

• Natural Product Sciences
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• 제23권2호
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• pp.97-102
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• 2017

Fourteen compounds were isolated from the stem of Angelica polymorpha. On the basis of spectral data, these compounds were identified as isoimperatorin (1), phellopterin (2), bergapten (3), xanthyletin (4), cnidilin (5), geijerine (6), (-)-3'-acetyl hamaudol (7), 7-demethylsuberosine (8), dehydrogeijerin (9), (-)-hamaudol (10), (+)-visamminol (11), divaricatol (12), scopoletin (13), and decursidate (14), respectively. Among them, compounds 4-6, 8, 9, 13, and 14 were isolated for the first time from A. polymorpha. Dehydrogeijerin (6) and geijerin (9) were isolated for the first time from genus Angelica. All isolates tested for inhibitory activity against acetylcholinesterae. Compounds 1 to 13 showed acetylcholinesterase inhibitory activity with $IC_{50}$ values ranging from 1.4 to $37.5{\mu}M$.