• 대한통합의학회지
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• 제11권2호
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• pp.169-179
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• 2023

Purpose : Although human periodontal ligament stem cells (hPDLSCs) are a supportive factor for tissue engineering, oxidative stress during cell culture and transplantation has been shown to affect stem cell viability and mortality, leading to failed regeneration. The aim of this study was to evaluate the antioxidant and protective effects against cell damage of celecoxib, a selective cyclooxygenase-2 (COX-2) inhibitor, and the antioxidant signal of hPDLSCs in H₂O₂-induced oxidative stress. Methods : To induce oxidative stress in cultured hPDLSCs, H₂O₂ was used as an exogenous reactive oxygen species (ROS). Dose-dependent celecoxib (.1, 1, 10, or 100 µM) was administered after H₂O₂ treatment. WST-1 assay was used to assess cell damage and western blot was used to observe antioxidant activity of hPDLSCs in oxidative stress. Immunohistochemistry was performed for inverting the localization of the SOD and Nrf2 antibody. Results : We found that progressive cell death was induced in hPDLSCs by H₂O₂ treatment. However, low-dose celecoxib reduced H₂O₂-induced cellular damage and eventually enhanced the SOD activity and Nrf2 signal of hPDLSCs. Oxidative stress-induced morphological change in hPDLSCs included lowered the survival and number of spindle-shaped cells, and shrinkage and shortening of cell fibers. Notably, celecoxib promoted cell survival function and activated antioxidants such as SOD and Nrf2 by positively regulating the cell survival signal pathway, and also reduced the number of morphological changes in hPDLS. Immunohistochemistry results showed a greater number of SOD- and Nrf2-stained cells in the celecoxib-treated group following oxidative stress. Conclusion : By increasing SOD and Nrf2 expression at the antioxidant system, the findings suggest that celecoxib enhanced the antioxidative ability of hPDLSCs and protected cell viability against H₂O₂-induced oxidative stress by increasing SOD and Nrf2 expression in the antioxidant system.

• Biomolecules & Therapeutics
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• 제6권1호
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• pp.9-13
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• 1998

ln an attempt to define the effects of hyperbaric oxygen treatment on the lipid peroxidation and oxygen See radical reactions in rats exposed to carbon monoxide, we studied malondialdehyde(MDA) level and activities of catalase and superoxide dismutase in the heart of the rats exposed to carbon monoxide. Male Sprague-Dawley albino rats weighing 240 to 260gm were used. Experimental groups consist of Control group (=breathing with air), HBO group(=exposed to hyperbaric oxygen(HBO, 3ATA, 100%) after air breath), CO group(=exposed to CO(3,970 ppm) after air breath), CO-Air group(=exposed to CO after air breath followed by air breath) and CO-HBO group(=exposed to CO after ai. breath followed HBO treatment). The CO group showed significantly higher MDA level, catalase activity and SOD activity as compared to that of control group. The CO-HBO group showed significantly lower MDA level as compared to that of CO group, and did not show significantly lower catalase activity and SOD activity as compared to that of CO group. These results suggest that the excessive oxygen free radicals is an important determinant in pathogenesis of Co-induced cardiotoxicity and HBO inhibits the lipid peroxidation caused by excessive oxygen free radicals in the heart of the rats exposed to carbon monoxide.

• 대한의생명과학회지
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• 제7권2호
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• pp.71-77
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• 2001

To evaluate the effect of occlusive skin on the activity of cutaneous oxygen free radical metabolizing enzymes in rats, the dorsal skin was covered with closed glass chamber shaped petri dish, 46 mm in diameter and 10 mm in height and sealed by an adhesive. Five day-occluded group showed more increased activity of xanthine oxidase (XO) than that of control, and the activity of five day-occluded group was higher than that of ten day-occluded group. The activities of superoxide dismutase (SOD) and glutathione peroxidase (GPx) were significantly higher in ten day-occluded group than in control or five day-occluded group. All the more, five day-occluded group showed the decreasing tendency of SOD and GPx activities compared to those of control. On the other hand, the cerrous perhydroxide deposits were observed in the intercellular space of the stratum basale in five day-occluded group under the electronic microscope using a cytochemistry method. Futhermore, the degree of cerrous perhydroxide reaction was lower in ten day-occluded group than in five day-occluded group. In conclusion, the increased XO activity and the decreased SOD and GPx activities are likely to responsible far the accumulation of $H_2O_2$ in five day-occluded group.

• 셀메드
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• 제6권4호
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• pp.28.1-28.6
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• 2016

Oxidative rancidity in foods causes undesirable changes in nutritive value, aroma, flavor, and color. Salix Koreensis Andersson in DC. (SK) has anti-oxidative and anti-inflammatory effects and is traditionally used to treat neuralgia, edema, pain, and inflammatory diseases. However, the regulatory effects of SK on oxidative and inflammatory reactions have not been elucidated. In this context, we scientifically validated the anti-oxidative and anti-inflammatory activities of SK leaf (SKL). The methanol extract of SKL was evaluated for in vitro anti-oxidative activities. SKL showed increased superoxide dismutase (SOD)-like activity and 1, 1-diphenyl-2-picrylhydrazyl radical scavenging activity. The in vitro anti-oxidant and anti-inflammatory activities of SKL were also investigated in lipopolysaccharide (LPS)-stimulated RAW 264.7 macrophages. LPS resulted in decreased SOD activities compared with the unstimulated cells, but SKL significantly increased SOD activities reduced by LPS. In addition, LPS-induced nitric oxide, tumor necrosis factor-${\alpha}$, and interleukin-6 productions were significantly and dose-dependently reduced by SKL in RAW264.7 macrophages without inducing cytotoxicity. In conclusion, these results indicate that SKL will be able to be effectively used as a food additive with anti-oxidative and anti-inflammatory effects.

• Biomolecules & Therapeutics
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• 제7권2호
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• pp.121-126
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• 1999

In an attempt to define the effects of hyperbaric oxygen treatment on the lipid peroxidation and oxygen free radical reactions in rats exposed to carbon monoxide, we studied malondialdehyde (MDA) level and activities of catalase and superoxide dismutase in the kidney of the rats exposed to carbon monoxide. Male Sprague-Dawley albino rats weighing 240 to 260 gm were used. Experimental groups consist of Control group (=breathing with air), HBO group (=exposed to hyperbaric oxygen 〔HBO, 3ATA, 100%〕 after air breath), CO group (=exposed to CO〔3,970 ppm〕after air breath), CO-Air group (=exposed to CO after air breath followed by air breath) and CO-HBO group (=exposed to CO after air breath followed HBO treatment). The CO group showed significantly higher MDA level, catalase activity and SOD activity as compared to that of control group. The CO-HBO group showed significantly lower MDA level as compared to that of CO group, and did not show significantly lower catalase activity and SOD activity as compared to that of CO group. These results suggest that the excessive oxygen free radicals is an important determinant in pathogenesis of CO-induced nephrotoxicity and HBO inhibits the lipid peroxidation caused by excessive oxygen free radicals in the kidney of the rats exposed to carbon monoxide.

• Natural Product Sciences
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• 제20권2호
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• pp.80-85
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• 2014

In the course of screening for antioxidant compounds from natural plants in Korea by measuring the radical scavenging effect, a methanol extract of the flower buds of Daphne genkwa S. et Z. (Thymelaeaceae) was found to show a potent antioxidant activity. Subsequent activity-guided fractionation of methanol extract of D. genkwa led to the isolation of four compounds from the ethyl acetate soluble fraction. The chemical structures were elucidated as genkwanin (1), 3'-hydroxygenkwanin (2), apigenin (3), and tiliroside (4) by spectroscopic techniques. Among them, compound 2 showed the significant anti-oxidative effect on DPPH. And compound 2 showed the significant riboflavin-and xanthine-originated superoxide quenching activities. To verify the antioxidant enzymatic activities of compound 2, the SOD enzymatic activity was measured spectrophtometrically using prepared Caenorhabditis elegans homogenates. The results showed that compound 2 was able to elevate SOD activity of C. elegans in a dose dependent manner. Moreover, compound 2 decreased the intracellular ROS accumulation of worms.

• Natural Product Sciences
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• 제19권1호
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• pp.49-53
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• 2013

Paeonia lactiflora Pall (PL) has been used as a traditional herbal medicine in China, Korea, and Japan for more 1,200 years. PL has reported to have antioxidant activity and protective effect of cells from oxidative stress, although the mechanism has not been verified. FOXO3a is a transcription factor that binds to its target gene's consensus FOXO binding site. FOXO3a protein modulates the various biological functions including cell cycle control, apoptosis, DNA repair, and ROS detoxification. Therefore, FOXO3a activity is associated with cancer, aging, diabetes, infertility, neurodegeneration, and immune system dysfunction. Here we found that FOXO3a was activated by PL extract. Transcriptional target genes such as MnSOD, p27, and GADD45 were activated by PL extract. Protein levels of MnSOD and catalase were increased, consequently, ROS level was reduced in HEF cells by PL extract. These findings suggest that PL extract has an antioxidant activity through FOXO activation and thereby activation of FOXO target genes, MnSOD and catalase.

• 한국자원식물학회지
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• 제26권3호
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• pp.389-396
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• 2013

The antioxidant enzyme and DPPH radical scavenging activity with variations in drying methods of diploid and tetraploid in Platycodon grandiflorum were determined. Antioxidant enzyme activities were measured as superoxide dismutase (SOD), catalase (CAT), peroxidase (POX), and ascorbate peroxidase (APX). The roots of Platycodon grandiflorum were freeze-dried, indoor-dried, hot-air dried, and microwave dried. The root extract of P. grandiflorum have shown the highest SOD enzyme activity of 92% in tetraploid of freeze-dried and indoor-dried while diploid of microwave dried showed the lowest SOD enzyme activity of 47.5%. The activity of CAT showed higher values in the root of tetraploid than in the diploid of P. grandiflorum in all drying methods. The APX activity showed relatively higher values in the root extract of freeze-dried both the diploid and tetraploid, but the difference in comparison with other extracts was not significant. The POX activities according to drying methods of diploid and tetraploid in P. grandiflorum showed relatively high values in freeze-dried and indoor-dried compared with other drying methods, and the POX activity between the diploid and tetraploid was not significant difference in each drying method. The DPPH radical scavenging activity with variation in drying methods of diploid and tetraploid in P. grandiflorum was the highest in the freeze-dried, and was higher in tetraploid than diploid in all the concentrations. In conclusion, the root of P. grandiflorum had the potent biological activities in both diploid and tetraploid. In particular, the tetraploid root of P. grandiflorum showing high antioxidant enzyme activity could be good materials for development of source of functional healthy food.

• 한국식품과학회지
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• 제31권3호
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• pp.831-837
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• 1999

곰팡이 독소인 ochratoxin A (OA)는 동물과 사람에게 간 및 신장의 손상을 일으키는 것으로 알려져 있다. 본 연구는 산화적 손상과 관련이 있는 OA-유발 지질과산화에 대한 항산화 비타민의 완화작용에 대하여 조사하였다. 수컷 ICR 마우스에 비타민 C (10 mg/kg)와 비타민 E (63.8 mg/kg)를 복강 투여하고, 한 시간 후에 0.1M $NaHCO_3$에 녹인 OA를 4 mg/kg/day의 용량이 되게 복강 투여하였다. 4일간 반복투여 한 후 간과 신장의 microsome 내의 superoxide dismutase (SOD) 및 catalase 활성과 malondialdehyde (MDA) 생성을 측정하였다. 아울러 comet assay에 의해 세포의 손상과 항산화 비타민의 완화 작용에 대한 관련성을 알아보았다. 결과들은 간과 신장에서 모두 i) OA투여에 의해 SOD, catalase 활성 및 MDA 수치가 유의성(p<0.05) 있게 증가하였고, ii)항산화 비타민 혼합 투여에 의해 OA에 의한 SOD, catalase 활성 및 MDA 형성이 유의성 있게 저하되었으며. iii) OA-유발 지질과산화와 관련이 있는 혈구세포의 손상도 항산화 비타민에 의해 완화되었다. 이러한 결과들은 항산화 비타민이 OA중독에 의한 간과 신장의 손상의 예방에 사용될 수 있을 것으로 사료된다.

• Applied Biological Chemistry
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• 제50권4호
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• pp.327-333
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• 2007

본 연구에서는 차조기의 30, 50, 70, 95% 에탄올 및 물추출물과 분획물의 전자 공여능, 지질산화 억제능, SOD 유사활성 및 xanthin oxidase 저해 활성을 측정하였다. 추출물의 전자 공여능은 $18{\sim}30%$ 정도로 낮았으나, 분획물에서는 95%과 70% 에탄올 추출물의 chloroform 분획이 50% 수준의 활성을 보였고, ethyl acetate 분획에서는 모든 추출용매에서 75% 이상의 활성을 보였다. 특히, 70% 에탄올 추출물의 ethyl acetate 분획물이 93.4%로 가장 높은 활성을 보였으며 $RC_{50}$에 요구되는 농도는 200.5 ppm이었다. 저장 온도 $40^{\circ}C$에서 linoleic acid의 자동산화를 가장 효과적으로 억제하는 것으로 나타난 추출물은 70% 에탄올 이었다. 분획물의 경우, 95% 에탄추출물은 hexane과 ethyl acetate 가용성분이 그 외 에탄올 추출과 물추출은 chloroform과 ethyl acetate 가용성분이 가장 높은 억제효과를 나타내었다. SOD 유사활성은 에탄올 추출물이 $28{\sim}32%$, 물추출물이 30.3%이었으며, 70% 에탄올 추출물이 32.4%로 가장 높았다. 분획물에서는 70% 에탄올 추출물의 ethyl acetate 가용분이 38.8%로 활성이 가장 높았으며 $IC_{50}$에 요구되는 농도는 1549.0ppm이었다. Xanthine oxidase 저해 활성은 에탄올추출물이 $36{\sim}41.2%$이었으며, 물추출물이 46.9%로 추출물중 가장 높았다. 분획물에서는 물추출의 ethyl acetate 가용분이 1,000 ppm 농도에서 52%의 활성을 보여 가장 높았다.