• Korean Journal of Food Science and Technology
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• v.37 no.3
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• pp.479-483
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• 2005

Antioxidative and protective effects of Ulmus davidiana var. japonica against oxidative damages induced by glutamate in PC 12 cells were investigated. Inhibitory activity against $FeSO_{4}-H_{2}O_{2}$-induced oxidative stress and DPPH radical-scavenging activity were detected in ethyl acetate and butanol fractions of ethanol extracts from stems and roots. Ethyl acetate and butanol fractions of ethanol extracts from roots significantly inhibited glutamate-induced cytotoxicity and reactive oxygen species in PC 12 cells. These results demonstrate ethyl acetate and butanol fractions of ethanol extracts of U. davidiana var. japonica have potent protective effect against glutamate-induced oxidative stress.

• The Korea Journal of Herbology
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• v.34 no.2
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• pp.1-14
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• 2019

Objective : This study was designed to evaluate the protective effect of Rehmanniae Radix Crudus (RC) in 150 mM HCl/ethanol induced acute gastritis mice. Methods : ICR mice were divided into 5 groups (normal group, control group, 10 mg/kg sucralfate treated group, 50 mg/kg RC treated group, 100 mg/kg RC treated group, n=8). Normal group was not take any treatment. Control group induced gastritis 1 hour after ingestion of distilled water. 10 mg/kg sucralfate induced group was induced gastritis 1 hour after ingestion of distilled of sucralfate 10 mg/kg. 50 mg/kg and 100 mg/kg RC treated groups were induced gastritis 1 hour after ingestion of distilled of RC 50 mg/kg and 100 mg/kg. After 1 hour of gastritis induction, removed the stomach tissue. We examined histological observations, oxidative stress biomarkers, antioxidant proteins, inflammatory mediators and cytokines. Results : In this study, the RC treatment group showed gastritis and gastric ulcer inhibition, and the area of injury decreased. The oxidative stress biomarkers such as reactive oxygen species (ROS) and peroxy nitrite ($ONOO^-$) in the serum were reduced in the RC treated group. Inaddition, antioxidant proteins (nuclear factor erythroid 2-related factor 2, Heme oxygenase 1) were increased in RC treated group, and the expression of inflammatory mediators and cytokines induced by nuclear factor-kappa B activation was inhibited. Conclusion : According to the results, RC may have an excellent inhibitory effect on acute gastritis and gastric ulcer.

• Applied Biological Chemistry
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• v.48 no.3
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• pp.273-279
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• 2005

To develop cosmetics using Jindalae flowers (Rhododendron mucronulatum), the surface tensions of extracts were measured and the properties and stability of cream with extracts were investigated. The surface tension of 0.1% ethanol extract was 30.42 mN/m and that of distilled water was 72.2 mN/m. The surface tension of cream with 0.1% ethanol extract was similar to that of sample cream and the measured pH were weakly alkalic. The surface tension of 1% ethanol extract was the lowest value of 24.98 mN/m, the measured pH of cream with 1% ethanol extract was weakly acidic and the particle size of cream was stable. According to an oscillatory test, linear viscoelastic region was extended by adding of 1% water extract and 1% ethanol extract to cream, indicating that the cream had greater enhanced resistance for preserving inner structure as compared to outside stress.　Besides, as a result of the diminished loss angle of ethanol extract cream, the elasticity of cream was increased more than that of sample cream and cream with 0.1% ethanol extract. In contrast, in the case of the increased loss angle of water extract cream, the viscosity of cream was increased. In conclusion, Rhododendron mucronulatum can be deliberated as a cosmetic material because 0.1% water and ethanol extracts showed efficacious physiological activities and cream with 1% extracts could extend linear viscoelastic region.

• Journal of Nutrition and Health
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• v.35 no.1
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• pp.24-29
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• 2002

Present study investigates the protective effects of green tea against acute ethanol administration on lipid peroxidation and antioxidant system in various regions of rat brain ; cortex, cerebellum, striatum and hippofampus. The following parameters were examined : malondialdehyde(MDA) concentrations and activities of superoxide dismutase(SOD), catalase and glutathione peroxidase(GSH-Px). Male Sprague-Dawley rats of 9 month old were given control diets or those containing 1% green tea powder for 4 weeks, and at tole end of feeding each diet group was received acute ethanol(5g/kg body weight) or equicaloric sucrose solution administration. Results indicated that green tea powder significantly decreased malondialdehyde(MDA) levels in the striatum(81.85nmol/g tissue) and hippocampus(71.68nmol/g tissue), compared to control group(145.68nmol/g tissue in the striatum, 119.04nmol/g tissue in the hippocampus). Also, a significant decrease was observed in the striatum of green tea-ethanol treated group compared to control group. Green tea significantly blocked an ethanol-induced catalase activation in the hippocampus, which means an ethanol administration drew a significant increase only in control diet groups. In conclusion, these results suggest that moderate consumption of green tea leaves ctrl have protective effects against ethanol induced oxidative stress on various regions of rat brain, by significantly reducing MDA concentrations in the striatum and hippocampus and inhibiting ethanol induced catalase activation in the hippocampus.

• Biomedical Science Letters
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• v.14 no.1
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• pp.13-18
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• 2008

Excessive alcohol consumption is associated with increased risks of many diseases including cancer. Individuals who regularly consume excessive quantities of alcohol have a greater risk of developing head and neck cancers such as esophageal, pharyngeal and oral cavity cancers if they are deficient in ALDH2 expression compared to normal populations. We evaluated lipid peroxidation in Aldh2 +/+ and Aldh2 -/- mice after they had been subjected to acute ethanol exposure. Malondialdehyde(MDA) level in liver tissue was evaluated as a biomarker of oxidative lipid peroxidation. Although the ethanol treatment did not increase the hepatic MDA level both in Aldh2 +/+ mice and in Aldh2 -/- mice, the MDA level was significant higher in the Aldh2 -/- mice than in the Aldh2 +/+ group. The MDA level was also significantly correlated with olive tail moment in blood and the level of 8-OHdG in liver tissue. This is a strong evidence to support our hypothesis that oxidative stress is more intense in Aldh2 -/- mice than in Aldh2 +/+ mice. Our results suggest that ALDH2-deficient individuals may be more susceptible than wild-type ALDH2 individuals to ethanol-mediated liver disease, including cancer.

• Preventive Nutrition and Food Science
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• v.16 no.2
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• pp.95-103
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• 2011

This study was performed to investigate the antioxidant mechanism of tomato wine with varying lycopene content in rats fed a high fat diet (HFD). Male Sprague-Dawley rats were randomly divided into five groups (n=10 per group) and fed an HFD (35% of total energy from fat) plus ethanol (7.2% of total energy from alcohol), tomato wine with varying lycopene content (0.425 mg%, 1.140 mg% or 2.045 mg% lycopene) or an isocaloric control diet for 6 weeks. Mice fed HFD plus ethanol significantly increased erythrocyte hydrogen peroxide and thiobarbituric acid reactive substances (TBARS) levels with increases in activities of erythrocyte antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px) and glutathione reductase (GR) compared to pair-fed rats. Supplementation of tomato wine with varying lycopene content decreased ethanol-mediated increases of erythrocyte lipid peroxidation and antioxidant enzyme activities in HFD-fed rats, and tomato wine with higher lycopene appeared to be more effective. Tomato wine also dose-dependently lowered TBARS levels with decreased pro-oxidant enzyme, xanthine oxidase (XOD) activity in plasma of HFD-fed rats. In contrast to erythrocytes, the inhibitory effects of tomato wine on hepatic lipid peroxidation were linked to increased hepatic antioxidant enzymes (SOD and CAT) and alcohol metabolizing enzyme (alcohol dehydrogenase and aldehyde dehydrogenase) activities. There were no significant differences in hepatic XOD and cytochrome P450-2E1 activities among the groups. Together, our data suggest that tomato wine fortified with lycopene has the potential to protect against ethanol-induced oxidative stress via regulation of antioxidant or pro-oxidant enzymes and alcohol metabolizing enzyme activities in plasma, erythrocyte and liver.

• Food Science and Biotechnology
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• v.18 no.4
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• pp.965-970
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• 2009

Oleuropein content of olive leaf extracts (OLE; ethanol extract) was evaluated by high performance liquid chromatography analysis. Oleuropein contents were $4.21{\pm}0.57$, $3.92{\pm}0.43$, $0.32{\pm}0.03$, $5.76{\pm}0.32$, and $32.47{\pm}0.25$ mg/100 g for ethanol extract, and hexane, chloroform, ethyl acetate, and butanol fraction, respectively. The removal of DPPH free radical increased in OLE and all 5 fractions of OLE in a concentration dependent manner. In order to investigate the antioxidant effect of OLE in vitro, 80%(v/v) ethanol OLE, $H_2O_2$, or combined treatment of 80%(v/v) ethanol OLE and $H_2O_2$ were applied on mouse embryonic fibroblast (MEF) cells. Cells were damaged by oxidative stress decreased their viability followed by increasing concentration of $H_2O_2$, but co-treatment of OLE and $H_2O_2$ showed an increase in cell growth about 20% compare to the cells treated with $H_2O_2$. OLE suppresses cytotoxicity induced by $H_2O_2$ in dose dependent manner. OLE treatment on MEF cells was also examined by analyzing cell cycle and apoptotic rate using flow cytometry. Apoptotic and necrotic cell accumulation was decreased in addition of OLE to $H_2O_2$ compare to the oxidative damaged cells. Taken together, these results demonstrated that OLE suppresses cytotoxicity induced by $H_2O_2$ and protect cells against oxidative stress on MEF cells.

• Journal of Pharmacopuncture
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• v.24 no.1
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• pp.24-31
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• 2021

Objectives: Accumulation of cellular reactive oxygen species (ROS) leads to oxidative stress. Increased production of ROS, such as superoxide anion, or a deficiency in their clearance by antioxidant defences, mediates cellular pathology. Grewia Spp fruits are a source of bioactive compounds and have notable antioxidant activity. Although the antioxidant capacity of Grewia Spp has been studied, there is very limited evidence that links the antioxidant activities of Grewia bicolor and Grewia flava to the inhibition of free radical formation associated with damage in biological systems. Methods: This study evaluated the protective effects of Grewia bicolor and Grewia flava extracts against free radical-induced oxidative stress and the resulting cytotoxicity effect using HeLa cells. Antioxidant properties determined using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and total phenolic content (TPC) assays showed significantly higher (p < 0.05) antioxidant activity in Grewia flava (ethanol extract) than Grewia flava (water extract) and Grewia bicolor (ethanol and water extracts). Results: Using 3-(4,5-dimethylthiazol-2-yl)-2,5diphenyltetrazolium bromide or MTT assay, cytotoxicity results showed that extracts of Grewia bicolor and Grewia flava were less toxic to HeLa cells at tested concentrations compared to the untreated control. This confirmed the low toxicity of these edible fruits at the tested concentrations in HeLa cells. Furthermore, hydrogen peroxide (H2O2)-induced cell loss was effectively reduced by pre-incubating HeLa cells with Grewia bicolor and Grewia flava extracts, with Grewia flava (ethanol extract) revealing better protection. Conclusion: The effect was speculated to be associated with the higher antioxidant activity of Grewia flava (ethanol extract). Additional studies will warrant confirmation of the mechanism of action of such effects.

• 한국생물공학회:학술대회논문집
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• 2000.04a
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• pp.355-356
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• 2000

Three 'stress probe' plasmids were constructed and characterized which utilize a green fluorescent protein (CFP) as a non-invasive reporter to elucidate Escherichia coli cellular stress responses in quiescent or 'resting' cells. Facile detection of cellular stress levels was achieved by fusion of three heat shock stress protein promoter elements, those of the heat shock transcription factor ${\sigma}^{32}$, pretense subunit ClpB, and chaperone DnaK, to the reporter gene $gfp_{uv}$. When perturbed by chemical or physical stress (such as heat shock, nutrient (amino acid) limitation, addition of IPTG, acetic acid, ethanol, phenol, antifoam, and salt (osmotic shock), the E. coli cells produced GFPuv which was easily detected from within the cells as emitted green fluorescence. A temporal and amplitudinal mapping of these responses was performed, demonstrating regions where quantitative delineation of cell stress was afforded.

• Biotechnology and Bioprocess Engineering:BBE
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• v.8 no.2
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• pp.83-88
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• 2003

A cellulose-producing strain isolated from rotten apples was identified as Gluconacetobacter hansenii based on its physiological properties and the 16S rDNA complete sequencing method, and specifically named Gluconacetobacter hansenii PJK. The amount of bacterial cellulose (BC) produced by G. hansenii PJK in a shaking incubator was 1.5 times higher than that produced in a static culture. The addition of ethanol to the medium during cultivation enhanced the productivity of bacterial cellulose, plus the supplementation of 1% ethanol into the culture medium made the produced BC aggregate into a big lump and thus protected the bacterial-cellulose-producing G. hansenii PJK cells in the shear stress field from being converted into non-cellulose-producing (Cel) mutants. Cells subcultured three times in a medium containing ethanol retained their ability to produce BC without any loss in the production yield.