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THE GREAT LAKES AND INTERNATIONAL ENVIRONMENTAL LAW: TIME FOR SOMETHING COMPLETELY DIFFERENT?
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김사량의 일본어 수필 ｢조선 여자(朝鮮の女)｣
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A Nurse Practitioner led Evaluation of a Clinical Protocol in the Primary Care Setting to Increase the Exclusivity and Duration of Breastfeeding to Six Months of Age.
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Dramen^ 1808-1811
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강릉시 산불방지 홍보관
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Dopamine에 의해 산화적 스트레스를 받은 Neuronal Cell에 뇌 보호 효과를 가지는 수종 생약추출물의 검색
구억,이학주,이동호,이현정,함아롬,마응천 한국생약학회 2009 생약학회지 Vol.40 No.1
Parkinson’s disease (PD) is the second most common neurodegenerative disorder after Alzhemier’s disease. Neuropathologically, PD is characterized by the selective loss of dopaminergic neurons. The neuronal toxicity of cytosolic excess dopamine (DA) has been described in many studies using several cell lines. In dopaminergic neurons, cytosolic excess DA is easily oxidized via monoamine oxidase (MAO)-B, tyrosinase or by auto-oxidation to produce neurotoxic metabolites such as DA quinone. So, in the present study, we induced cell death by treatment of DA (600 µM) in human neuroblastoma SH-SY5Y cell which was treated samples before 24 hr, and cell viability was measured by fluorescence activated cell sorter (FACs) analysis. Of those tested, the extracts of Poria cocos (赤茯笭)(whole), Gastrodia elata (rhizomes), Eucommia ulmoides (炒)(barks), Syneilesis palmata (whole), Acorus gramineus (rhizomes), Ligustrum japonicum (leaves) showed neuroprotective effects in dose dependent manner.
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Nitric oxide에 의해 산화적 스트레스를 받은 Neuronal cell에 항산화 효과를 가지는 수종 생약추출물의 검색
구억,이학주,이동호,이현정,함아롬,조은영,마응천 한국생약학회 2008 생약학회지 Vol.39 No.4
The objective of this study is screening the anti-oxidative effects of several plant MeOH extracts against oxidative stress in Neuroblastoma cell. Oxidative stress has been implicated in the pathogenesis of many neurotoxicity, neurodegenerative disorders and cell death. This oxidative stress is generated by ROS (Reactive Oxygen Species) such as nitric oxide, nitrogen dioxide, peroxyl, superoxide (O2 - ), hydroxyl, alkoxyl. So, in the present study, we induced oxidative stress by treatment of sodium nitroprusside (2.5 mM) in human neuroblastoma SH-SY5Y cell which was treated samples before 24hr, and cell viability was measured by MTT reduction assay. Of those tested, the extracts of Paeonia japonica (roots), Eucommia ulmoides (炒)(barks), Paeonia japonica (曝乾)(roots), Phyllostachys bambusoides (stems), Polygala tenuifolia (去心, 炒)(roots), Paeonia japonica (roots), Polygala tenuifolia (roots), Machilus thunbergii (barks), Mallotus japonicus (leaves), Poria cocos (whole), Sophora flavescens (roots), Angelica tenuissima (roots), Angelica gigas (當歸尾)(roots) showed anti-oxidative effects[EC50<15.20 μg/ml(Carnosine:Positive control)]in dose dependent manner.
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산소-포도당 결핍(OGD) 유도성 신경세포 사멸에 대한 뇌 보호 효과를 가지는 수종 생약추출물의 검색
이학주,구억,이현정,이동호,마웅천 한국약용작물학회 2009 한국약용작물학회지 Vol.17 No.5
Cerebral ischemia results from a transient or permanent reduction in cerebral blood flow that decreases oxygen and glucose supply. When the cellular oxygen supply is reduced to critical level, damage to cells and induction of cell death are occurred by excitotoxicity, oxidative stress and inflammation. Ischemia remains one of the leading causes of death, but there is no effective treatment that might protect neurons gainst ischemia by interrupting the cascade of cell death. In this study, human neuroblastoma SH-SY5Y cells are exposed to oxygen and glucose deprivation (OGD) followed by reoxgenation. OGD can mimic the acute restriction of metabolite and oxygen supply caused by ischemia and is widely used as a model of ischemic conditions. SH-SY5Y cells are treated samples at the commencement of OGD to achieve different final concentrations, and cell viabilities were quantified using the measurement of flow cytometry analysis. Of those tested, the extracts of Polygala tenuifolia (roots), Dictamnus dasycarpus (barks), Polygala tenuifolia (roots), Eucommia ulmoides (branches), Eucommia ulmoides (barks), Poria cocos (whole), Sophora flavescens (roots) showed neuroprotective effects, with EC50 values of 4.5±0.6, 7.9±1.5, 10.5±0.7, 18.4±1.9, 19.6±0.3, 21.6±1.9, and 30.7±3.9μg/ml, respectively.
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이학주,류다현,구억,이성진,홍성수,김계목,김경호,이동호,마응천 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.8
Three known 2-arylbenzofurans, moracin P (1), moracin O (2) and mulberrofuran Q (3) were isolated from the MeOH extract of the Mori Cortex Radicis. These compounds 1-3 enhanced cell viability in dose-dependent manner against oxygen-glucose deprivation (OGD)-induced cell death in neuroblastoma SH-SY5Y cells, which was measured by MTT reduction assay. (EC50 values of 10.4, 12.6, and 15.9 μM, respectively). In addition, the compounds 1-3 were examined for their inhibitory effect on OGD-induced ROS production by FACS analysis. We observed these compounds reduced ROS production in OGD-induced cell death (IC50 values of 1.9, 0.3 and 12.1 μM, respectively). Consequently, reactive oxygen species (ROS) were overexpressed in OGD-induced cells and all three compounds reduced ROS induced by OGD in dosedependent manner. Taken together, compounds 1-3 might protect neuronal cell death against the oxidative stress induced by OGD, though further studies in vitro and in vivo models are necessary.
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