• 생명과학회지
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• 제10권5호
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• pp.504-510
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• 2000

This study was designed to investigate the effects of mulberry (Morus alba L.) leaf extract (MLE) on oxygen radicals and their scavenger enzymes in liver membranes of rats. Sprague-Dawley (SD) male rats (160$\pm$10 g) were fed basic diet (control group), and experimental diets (MLE-100 and MLE-300 groups) added 100 and 300 mg/kg BW/day for 6 weeks. Hydroxyl radical (.OH) levels resulted in a significant decreases (15.2% and 18.1%, 5.6% and 8.0%, respectively) in liver mitochondria and microsomes could be not obtained. These are no significant differences in superoxide radical ($O_2$) levels of liver cytosol in MLE-100 and MLE-300 groups compared with control group. Lipid peroxide (LPO) levels were slightly decreased about 13.6% and 6.1% in liver mitochondria and microsomes of MLE-300 group compared with control group. Oxidized protein (OP) levels were remarkably decreased about 16.9% and 27.2% in liver microsomes only of MLE-100 and MLE-300 group compared with control group. Mn-SOD activities in liver mitochondria were remarkably increased (18.2% and 28.7%, respectively) in MLE-100 and MLE-300 groups, and Cu,Zn-SOD activities in liver cytosol were also significantly increased (11.3% and 20.2%, respectively) in MLE-100 and MLE-300 groups compared with control group. Mn-SOD activities in liver mitochondria were remarkably increased (18.2% and 28.7%, respectively) in MLE-100 and MLE-300 groups, and Cu,Zn-SOD activities in liver cytosol were also significantly increased (11.3% and 20.2%, respectively) in MLE-100 and MLE-300 groups compared with control group, but significant difference between GSHPx activities in liver cytosol could be not obtained. These results suggest that anti-aging effect of mulberry leaf extract (MLE) may play a pivotal role in attenuating a various age-related changes.

• 약학회지
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• 제47권1호
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• pp.37-45
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• 2003

The present study was undertaken to investigate the anticancer activity of monoterepenes in the animal and the cancer cell line tests. Both of the noncyclic and cyclic monoterpenes showed significant life prolonging effects on ICR mouse with abdominal cancer induced by Sarcoma 180 cells up to 67.4％ and 63.5％ in case of linalool and geraniol, respectively. Linalool and geraniol also exhibited very excellent cytotoxicity against L1210 leukemic cells with $IC_{50}$/ value of 0.32 $\mu\textrm{g}$/mι in 5 days culture condition. In the presence of linalool and geraniol, the generation of $O_2$$^{[-10]}$ ion were found to be increased proportionally to the cytotoxicity arisen from these monoterpenes. Furthermore, the antioxidant enzymes activities such as superoxide dismutase (SOD) and glutathione peroxidase (GPx) responsible for the conversion of $O_2$$^{[-10]}$ ion to $H_2O$$_2$ and then to $H_2O$ augmented remarkably by linalool and geraniol. All data put together it can be postulated that monoterpenes may kill abdominal cancer cells of ICR mouse probably by activating anticancer system of the body, whereas the death of L1210 cells may be due to the detrimental attacks of reactive oxygen species (ROS) including $O_2$$^{[-10]}$ in spite of antioxidant enzymes activities to overcome the ROS attacks.

• 한국수산과학회지
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• 제20권4호
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• pp.300-307
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• 1987

어유의 산화에 의한 DNA 손상작용기구를 밝히는 연구의 일환으로 고등어에서 추출한 지질을 다시 극성 및 비극성지질로 분획하여 이들을 각각 plasmid DNA와 $37^{\circ}C$에서 반응시키면서 이들 지질의 산화에 의한 DNA 손상작용을 $1\%$ agarose gel 전기영동을 통하여 조사하였는데 그 결과를 요약하면 다음과 같다. 극성지질을 DNA와 반응시킨 경우에는 가장 적은 농도에서도 DNA 손상작용이 크게 나타나 반응 l일째에 Form I DNA가 완전히 절단되어 Form II 및 Form III DNA로서 검출되었다. 극성지질의 산화에 의하여 그 농도가 증가함에 따라 POV의 증가가 빠르게 이루어졌으나 반응 4일동안 POV가 100 millieq./kg 이하에서 DNA 손상작용이 일어나는 것을 알 수 있었고, 한편, 극성지질의 산화에 의한 DNA 손상작용에 대한 활성산소종의 영향에서는 총지질의 경우처럼 일중항산소 $^1O_2$와 superoxide anion ${\cdot}O_2^1$의 영향이 가장 컸으며 수산 radical${\cdot}OH$과 과산화수소$(H_2O_2)$는 그다지 뚜렷한 영향을 나타내지 않았다. 비극성지질의 경우에서도 극성지질과 마찬가지로 농도에 따라 DNA 손상능이 커졌으나 극성지질과 총지질에 비하여 그 정도가 훨씬 떨어지는 것을 알 수 있었으며, 이상의 DNA 손상작용에 대한 활성산소종의 영향에 있어서도 극성지질과 동일한 경향을 나타내었다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XII)
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• pp.706-709
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• 2003

The antioxidant activities of methanol and dichloromethane/acetone extracts of twenty three seaweeds were tested by using 1,1-Diphenyl-2-picryl-hydrazyl(DPPH) at a $100{\mu}g/ml$ concentrations. The dichloromethane/acetone extracts of three seaweeds(Symphyocladia latiuscula, Gloiopoltis furcata, Sagassum thunbergii), were found to be most effective in DPPH radical scavenging activity. The DPPH radical scavenging effect of these seaweeds was Symphyocladia latiuscula(85.82%), Gloiopoltis furcata(82.83%), Sagassum thunbergii(74.05%) in order. These seaweeds were evaluated using the pyrogallol UV-VIS spectrophotometeric method to generate superoxide anion. Among them, the methanol extracts of six seaweeds were showed weak superoxide dismutase-like activities. The dichloromethane/acetone extracts obtained from Symphyocladia latiuscula was fractionated with $CH_2Cl_2$, n-hexane, 15% aq.MeOH, n-BuOH, $H_2O$. The 15% aq.MeOH soluble fraction exhibiting the strongest antioxidative activities was further purified by C18 column flash chromatography and reversed HPLC. The two active principles of Symphyocladia latiuscula were isolated and characterized as 2,3,6-tribromo-4,5-dihydroxybenzyl alcohol(1), 2,3,6-tribromo-4,5-dihydroxybenzyl methyl ether(2).

• BMB Reports
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• 제30권2호
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• pp.89-94
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• 1997

In this study, during the activation of neutrophil responses by sodium fluoride. involvement of protein tyrosine kinase was studied. Respiratory burst lysosomal enzyme release and elevation of $[Ca^{2+}]_i$stimulated by sodium fluoride in neutrophils were inhibited by protein kinase inhibitors, genistein and tyrphostin. The inhibitory effect of genistein and tyrphostin on superoxide and $H_{2}O_{2}$ production was less than that of protein kinase C inhibitors, staurosporine and H-7. Staurosporine and H-7 had little or no effect on the release of myeloperoxidase and acid phosphatase stimulated by sodium fluoride. EGTA and verapamil inhibited the elevation of $[Ca^{2+}]_i$ evoked by sodium fluoride. The inhibitory effect of staurosporine on the elevation of $[Ca^{2+}]_i$ was less than that of genistein. Phorbol 12-myristate 13-acetate (PMA)-stimulated superoxide production, which is sensitive to staurosporine, was further enhanced by genistein, whereas the stimulatory action of PMA on myeloperoxidase release was inhibited by genistein. A pretreatment of neutrophils with PMA signifcantly attenuated sodium fluoride-evoked elevation of $[Ca^{2+}]_i$ These results suggest that protein tyrosine kinase may be involved in the activation process of neutrophil responses due to direct stimulation of guanine nucleotide regulatory proteins. In neutrophil responses, PMA-stimulated neutrophils appear to show a different type of inhibition of protein tyrosine kinase.

• Bulletin of the Korean Chemical Society
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• 제18권9호
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• pp.916-922
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• 1997

A superconducting phase La2CuO4+δ (Tc=44 K) has been prepared by electrochemical oxidation which allows the oxygen to intercalat into the La2O2 layers. According to the Cu K-edge X-ray absorption near edge structure spectroscopic analysis, the oxidized phase shows an overall spectra shift of about 0.5 eV to a higher energy region compared to the as sintered one with the occurrence of an additional peak corresponding to the transition to the |1s13dn+1L-14pσ1 > final state, indicating the oxidation of CuO2 layer. From the X-ray photoelectron spectroscopic studies, it is found that the binding energy of La 3d5/2 is significantly shifted from 834.3 eV (as sintered La2CuO4) to 833.6 eV (as electrochemically oxidized La2CuO4+δ), implying that the covalency of the (La-O) bond is decreased due to the oxygen intercalation. The O 1s spectra do not provide an evidence of the superoxide or peroxide, but the oxide (O2-) with the contaminated carbonate (CO32-) based on the peaks at 529 eV and 532 eV, respectively, which is clearly confirmed by the Auger spectroscopic analysis. Oxygen contents determined by iodometric titration (δ=0.07) and thermogravimetry (δ=0.09) show good coincidence each other, also giving an evidence for the "O2-" nature of excess oxygen. From the above results, it is concluded that "O2-" appeared as O 1s peak at 528.6 eV is responsible for superconductivity of La2CuO4+δ.

• Tuberculosis and Respiratory Diseases
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• 제50권5호
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• pp.579-590
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• 2001

연구배경 : 노화란 반응성산소종에 의한 산화적 손상이 축적되어 세포의 기능의 저하로 초래된다고 주장되고 있다. 본 연구에서 1, 4, 8, 12개월된 정상 생쥐의 폐에서 반응성 산소종 생성의 초기에 중요한 방어기전인 superoxide dismutases(SODs) mRNA와 hydroxy radical($OH{\cdot}$)에 의한 산화적 손상의 마지막 방어기전인 metallothionein(MT) mRNA의 함량과 paraquat에 의한 유도능을 조사하였다. 방 법 : 산화적손상은 세포내에서 superoxide을 생성하는 paraquat를 투여한 후 SODs와 MT mRNAs을 RT-PCR 방법으로 측정하였다. 결 과 : 정상생쥐의 폐의 노화과정에서 Mn-SOD와 Cu/Zn-SOD, 그리고 MT mRNA의 항정상태 함량을 조사한 결과, Mn-SOD mRNA는 8개월까지는 증가하다가 12개월에서 감소하였으나, Cu/Zn-SOD mRNA는 별 변화가 없었고 12개월에 감소하였다. 그러나 MT mRNA는 어느 연령에도 변화가 없었다. 산화성 스트레스를 유발하는 paraquat에 의하여 Mn-SOD mRNA는 4개월 부터 유도되지 않았으며, Cu/Zn-SOD mRNA는 전혀 유도되지 않았다. MT mRNA는 관찰한 전 연령에서 유도되었다. 결 론 : 노화과정에서 SODs유도능의 이상이 노화의 원인 인자로 작용하고, 반면에 MT의 정상적인 유도능이 산화적 스트레스에 대하여 방어 역할을 할 가능성을 시사해주고 있다. 이와 같은 결과는 연령이 증가함에 따라 Mn-SOD, Cu/Zn-SOD, 및 MT의 발현과 유도능의 차이로 인하여 반응성 산소종에 의한 산화적 손상의 정도의 차이가 노화의 속도를 결정하는 하나의 인자로 작용할 가능성 이 있을 것으로 생각된다.

• Preventive Nutrition and Food Science
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• 제9권2호
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• pp.150-155
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• 2004

The free radical scavenging activities and the protective effects of Rhus javanica extracts against oxidative damage induced by reactive oxygen species (ROS) were investigated. n-Hexane, ethyl acetate and water fractions were prepared from a methanol extract. DPPH radical, superoxide anion and hydroxyl radical scavenging activities were estimated. Intracellular ROS formation was quantified using fluorescent probes, 2', 7'-dichlorofluorescin diacetate (DCFH-DA) for hydroxyl radical and dihydroethidium (DHE) for superoxide anion. The oxidative DNA damage was investigated by the comet assay in HepG$_2$ cells exposed either to $H_2O$$_2$ or to menadione. The highest $IC_{50}$/ values for DPPH radical scavenging activity was found in the ethyl acetate fraction with a value of 5.38 $\mu\textrm{g}$/mL. Cells pretreated with $\geq$ 1 $\mu\textrm{g}$/mL of the ethyl acetate extract had significantly increased cell viability compared to control cells, which were not pretreated with the extract. Intracellular ROS formation and DNA damage in HepG$_2$ cells, which were pretreated with the various concentrations of Rhus javanica ethyl acetate extract and then incubated either with $H_2O$$_2$ or with menadione, reduced in a dose-dependent manner. These findings suggest that Rhus javanica might have biologically active components which have strong protective effects against ROS induced oxidative damages to the biomolecules, such as cell membranes and DNA.

• 약학회지
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• 제34권2호
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• pp.112-116
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• 1990

8-Acyl-2-hydroxyphenzaine -5, 10-dioxides and 8-acyl-2-aminophenazine-5, 10-dioxides bearing n-butanoyl, n-hexanoyl and n-octanoyl groups were synthesized. It was attempted to observe the effect of phenazine dioxide derivatives on the hepatic xanthine oxidase activity in this study. As the activity of xanthine oxidase, the key enzyme in the generation of superoxide anion radical ($O_2$), was measured in the presence of phenazine dioxide derivatives, the action of 8-acyl-2-hydroxyphenazine-5,10-dioxide derivatives inhibited with increase of numbers of carbon atom bearing 8-acyl group. Moreover, when plotted on double reciprocal form, the Vmax value decrease as increase of numbers of carbon atom bearing acyl groups without affecting the Km value. However, the hepatic xanthine oxidase activity was not changed by 8-acyl-2-aminophenazine-5,10-dioxide derivatives.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
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• pp.214.2-215
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• 2003

Reactive oxygen species play an important role in aging. carcinogenesis, and certain neurological disorders of human beings in addition to the host-defensive mechanism of inflammatory response. Murine macrophages Raw264.7 released superoxide anions via NADPH oxidase complex and nitric oxide (NO) via iNOS synthase when the cells were stimulated with unopsonized zymosan binding to complement receptor. (omitted)