• 한국식품위생안전성학회지
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• 제10권4호
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• pp.279-282
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• 1995

Eight natural or semistynthesized monoterpenes were examined for their effects in rat brain monoamine oxidase(MAO) using benzylamine as substrate. Thujone and 3-carene were found to have the inhibition effects on rat brain MAQ activity, 38% and 95% inhibition at 103M respectively. The kinetic study on 3-carene, the most potent inhibitive type. But (+) pulegon and (-) isopulegon was found to activate MAO slightly.

• Toxicological Research
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• 제3권1호
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• pp.9-14
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• 1987

The effects of monosodium glutamate (MSG) on the activities if tyrosine hydroxylase (TH), dopamine ${\beta}$-hydroxylase (DBH), tryptophan hydroxylase (TPH) and monoamine oxidase (MAO) in various regions (cerebral cortex, striatum, midbrain, pons and medulla of nat brain have been determined. It was observed that up to 1mM MSGhad no significant effects on the activities of brain tyrosine hydroxylase, dopamine ${\beta}$-hydroxylase, tryptophan hydroxylase and monoamine oxidase in all regions of rat brain. These results indicated that MSG itself exerted no direct effect on the important enzymes synthsizing and metabolizing the monoaminergic neuronal system.

• 한국식품영양학회지
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• 제17권4호
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• pp.347-355
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• 2004

초석잠 메탄올 추출물이 뇌신경전달물질과 관련이 있는 acetylcholine esterase, monoamine oxidase 및 xanthine oxidase의 활성억제효과에 대하여 실험하였다. 실험관내에서 초석잠 추출물을 각각 100 및 200mg/kg씩 첨가한 다음 실험한 결과 첨가농도가 증가할수록 과산화지질의 생성을 억제하여 용량 의존형으로 나타났다. 쥐를 대상으로 20일간 투여한 동물실험에서는 초석잠 추출물 100 mg/kg을 식이에 혼합하여 투여한 결과 지질 과산화의 생성을 억제하였다. Acetylcholine esterase의 활성의 경우 초석잠 추출물을 100 mg/kg 투여한 결과 대조군에 비하여 효소활성이 23.11%로 억제되었고, monoamine oxidase 및 xanthine oxidase 활성이 각각 21.93% 및 63.58%로 억제되었다. 그리고 초석잠 추출물을 100 mg/kg을 투여한 경우 xanthine dehydrogenase로부터 xanthine oxidase로의 형전환비율은 28%로 현저하게 억제되었다. 또한, Xanthine dehydrogenase로부터 oxidase로의 형전환비율을 실험한 결과 정상상태에 비하여 억제됨을 알 수 있었다.

• 생약학회지
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• 제29권4호
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• pp.271-276
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• 1998

The inhibitory effects of MeOH extracts of 100 medicinal herbs on monoamine oxidase (MAO) activity were investigated. MAO was purified from mouse brain and its activity was determined by fluorospectrophotomer using kynuramine as a substrate. Nine kinds of MeOH extracts of herbs including Artemisia iwayomogi showed a mild inhibitory effect with ${100}-{200}\;{\mu}/ml$ in their $IC_{50}$ values on MAO activity. Seventeen MeOH extracts including Juglans mandshurica exhibited a weak inhibition of MAO activity with ${200}-{300}\;{\mu}/ml$ in their $IC_{50}$ values.

• 약학회지
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• 제29권6호
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• pp.367-374
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• 1985

The age-related changes of monoamine contents and monoamine oxidase (MAO) activities in the whole brain and blood pressures were measured and compared every week during the ages of 5 weeks to 12 weeks in two types of animals; (1) spontaneously hypertensive rats (SHR) and (2) normotensive Sprague-Dawley rats (NR). Blood pressures in SHR began to rise at the ages of 7 or 8 weeks and were significantly higher thereafter than in NR. Abnormally low MAO activities in the brain of SHR were detected from the ages of 8 weeks. Comparisons were also made between brain monoamine-norepinephrine, dopamine and 5-hydroxytrytamine contents of SHR and those of NR at the same ages throughout the test period. In SHR, none of those monoamine values was consistently higher or lower than in NR during the test period. Protein contents of the brain between SHR and NR were not significantly different at any ages. These observations suggest that the abnormally low MAO activities in SHR brain may be one of the underlying neurological factors for the susceptibilities to hypertension and the deficit of MAO activities may be due to the changes in properties rather than in amount of this enzyme.

• 생약학회지
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• 제37권4호
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• pp.320-323
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• 2006

The effects of evodiamine on monoamine oxidase (MAO) activity were investigated. MAO was purified from mouse brain and the $K_m\;and\;V_{max}$ values of MAO were $78.5{\pm}5.28{\mu}M$ and $0.68{\pm}0.07$ nmol/min/mg protein, respectively (n=4). Evodiamine at $30-120{\mu}M$ showed an inhibitory effect on MAO activity using a substrate kynuramine with an $IC_{50}$ value of $104.2{\mu}M$ (n=4). Evodiamine also exhibited a non-competitive inhibition on MAO. The $K_i$ value for evodiamine was $72.5{\pm}10.8{\mu}M$ (n=4). These results suggest that evodiamine partially contributes to the regulation of monoamine content.

• 한국임상약학회지
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• 제8권2호
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• pp.139-142
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• 1998

The effects of MeOH extracts from 28 herbal medicines on monoamine oxidase (MAO) activity were investigated. MAO was purified from mouse brain and its activity was determined by fluoro-photometry using kynuramine as a substrate. Three MeOH extracts, Coptis japonica, Cinnamomum cassia and Poncirus trifoliate from the herbal medicines showed a strong inhibitory effect with less than $100\;{\mu}g/ml$ in their inhibitory amounts of $50\%$ ($IC_{50}$ values) on MAO activity. Four MeOH extracts including Evodia officinalis exhibited a mild inhibition of MAO activity with $100-200\;{\mu}g/ml$ in their $IC_{50}$ values.

• Natural Product Sciences
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• 제6권2호
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• pp.70-72
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• 2000

The effects of coptisine on monoamine oxidase (EC 1.4.3.4; MAO) activity in mouse brain were investigated. Coptisine showed an inhibitory effect on MAO activity with a concentration-dependent manner. Coptisine exhibited 51.0% inhibition of MAO activity at $9\;{\mu}M$. The $IC_{50}$ value of coptisine was $8.7\;{\mu}M$. Coptisine inhibited MAO activity competitively with kynuramine as a substrate. The $K_i$ value of coptisine was $4.1\;{\mu}M$. These results indicate that coptisine functions to regulate the catecholamine content at biologically active sites.

• 생약학회지
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• 제37권3호
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• pp.157-161
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• 2006

We examined the inhibitory activities against monoamine oxidase (MAO) of Prunella vulgaris in vitro and in vivo methods. Methanolic extract of P. vulgaris showed significantly Inhibitorγ activities on MAO-A and MAO-B that were prepared from rat brain and liver in vitro. The inhibitory activities were measured by serotonin and benzylamine as substrates, respectively. MAO-A and MAO-B activities were potently inhibited by ethylacetate extracts of P. vulgaris in vitro tests. It was observed that those activities in vivo tests have different tendency each other. MAO-A activity was increased by the oral administration of methanolic extract of P. vulgaris while MAO-B activity was decreased. Consequently, we suggest that P. vulgaris may have the effects on the inhibitory activities against MAO both in vitro and in vivo.

• 대한한방내과학회지
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• 제22권3호
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• pp.321-330
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• 2001

Objectives: This study was undertaken to investigate the action mechanism of Holotrichia (HT) at parameter related to dementia. Methods: HT was tested for the effects on acetylchonine esterase and monoamine oxidase activities, lipid peroxidation, antioxidation in brain of lead acetate-treated rats. Lead acetate were treated firstly into samples for 10 days, and then lead acetate and HT were set with them for 20 days. Results: The level of lipid peroxide, acetylcholine esterase and monoamine oxidase activities, enzyme activities and ratio of type conversion of xanthine oxidase increased in lead acetate-treated rats were decreased as highly as normal group by HT. Superoxide dismutase, catalase and glutathione peroxidase activities, the level of acetylcholine decreased in lead acetate-treated rats were increased as lowly as normal group by HT. Conclusions : These results suggest that HT might have an effect on treatment of dementia according to decreasing the activities of acetylcholine esterase, monoamine oxidase and level of lipid peroxide in brain.