• BMB Reports
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• 제42권5호
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• pp.304-309
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• 2009

Nanoparticulate platinum (II) (nano Pt) is a powerful antioxidant that is widely used to scavenge reactive oxygen species (ROS). The antioxidant activity of nano Pt has gained attention as a potentially useful therapeutic for a variety of diseases including cancer and aging. In the present study, we prepared nanoparticulate saponin-Pt (II) (nano saponin-Pt) conjugates using the ethanol reduction method to enhance the permeability and retention effect of Pt. The nano saponin-Pt conjugates were found to restore the viability of approximately 40% of 2,4-dinitrofluorobenzene (DNFB)-treated RAW 264.7 cells. In addition, we found that nano saponin-Pt conjugates acted as a potent antioxidant that reduced the production of ROS and inhibited activation of the MAP kinase pathway and MIP-2 gene expression in response to DNFB. These results provide insight into the potential usefulness of nano saponin-Pt conjugates as a treatment for contact hypersensitivity.

• Journal of Preventive Medicine and Public Health
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• 제42권6호
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• pp.360-370
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• 2009

Genetic factors clearly play a role in carcinogenesis, but migrant studies provide unequivocal evidence that environmental factors are critical in defining cancer risk. Therefore, one may expect that the lower availability of substrate for biochemical reactions leads to more genetic changes in enzyme function; for example, most studies have indicated the variant MTHFR genotype 677TT is related to biomarkers, such as homocysteine concentrations or global DNA methylation particularly in a low folate diet. The modification of a phenotype related to a genotype, particularly by dietary habits, could support the notion that some of inconsistencies in findings from molecular epidemiologic studies could be due to differences in the populations studied and unaccounted underlying characteristics mediating the relationship between genetic polymorphisms and the actual phenotypes. Given the evidence that diet can modify cancer risk, gene-diet interactions in cancer etiology would be anticipated. However, much of the evidence in this area comes from observational epidemiology, which limits the causal inference. Thus, the investigation of these interactions is essential to gain a full understanding of the impact of genetic variation on health outcomes. This report reviews current approaches to gene-diet interactions in epidemiological studies. Characteristics of gene and dietary factors are divided into four categories: one carbon metabolism-related gene polymorphisms and dietary factors including folate, vitamin B group and methionines; oxidative stress-related gene polymorphisms and antioxidant nutrients including vegetable and fruit intake; carcinogen-metabolizing gene polymorphisms and meat intake including heterocyclic amins and polycyclic aromatic hydrocarbon; and other gene-diet interactive effect on cancer.

• International Journal of Industrial Entomology and Biomaterials
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• 제4권2호
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• pp.101-107
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• 2002

We describe here the cDNA sequence and mRNA expression of a novel family of the antioxidant protein, peroxiredoxin, from the firefly, Pyracoetia ruin. The 555 bp cDNA sequence codes for a 185 amino acid protein with a calculated molecular mass of approximately 21 kDa. The deduced protein of P. rufa peroxiredoxin gene contains two conserved cysteine residues. Alignment of the deduced protein of P. rufa peroxiredoxin gene showed 71.1% protein sequenceidentity to known insect Drosophila melanogaster peroxiredoxin. Northern blot analysis revealed that the P. rufa peroxiredoxin is specifically expressed in the fat body of P. rufa larvae.

• 한국양식학회:학술대회논문집
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• 한국양식학회 2003년도 추계학술발표대회 논문요약집
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• pp.39-39
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• 2003

Antioxidant enzyme genes play a key role in cell defense against the lethal effects of oxidative stresses in animals and have an essential function which has allowed the evolution of aerobic respiration starting from an ancient form of oxygen-insensitive life. Piscine antioxidant enzymes are also involved in the rapid response to various toxic chemicals as well as many biological stresses, indicating that they could be used as biomarkers for health and aquatic environment. With the purpose for developing fine molecular probing tool to assess the stresses in marine fish, we identified three major antioxidant enzyme genes (superoxide dismutase, catalase and glutathione-S-transferase) from Korean rock bream using expressed sequence tag analysis and/or high density filter screening. Here we report the molecular information on these gene transcripts including complete sequence data and expression profiles.

• Bulletin of the Korean Chemical Society
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• 제28권2호
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• pp.225-228
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• 2007

Lipoic acid (LA) is a multifunctional antioxidant against a variety of ROS. Nitrone acts as free radical spin trap and exhibits neuroprotective activity. Thus, LA-nitrone derivatives (6, 7, 8, and 9) were synthesized and screened as an antioxidant and inhibitors for cholinesterases. Even though the antioxidant effect of LA-nitrone derivatives was not improved, they turned out to be effective inhibitors of acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) in μM range.

• 한국토양비료학회지
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• 제44권1호
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• pp.53-57
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• 2011

The MuSI is known as a multiple stress resistant gene with several lines. A previous study using RT-PCR showed that the expression of MuSI gene in tobacco plant induced its tolerance to Cd stress. This study was conducted to examine the enhanced Cd tolerance of the MuSI transgenic tobacco plant through germination test and to understand the role of the involved antioxidant enzymes for the exhibited tolerance. Germination rate of MuSI transgenic tobacco was more than 10% higher than that of wild-type tobacco, and seedlings of MuSI transgenic tobacco grew up to 1.6 times larger and greener than seedlings of wild-type tobacco at 200 and 300 ${\mu}M$ Cd. From the third to the fifth day, CAT activities at 100 and 200 ${\mu}M$ Cd and APX activities at 100, 200 and 300 ${\mu}M$ Cd of MuSI transgenic tobacco were up to two times higher than those of wild-type tobacco. MuSI gene is shown to enhance the activities of antioxidant enzymes resulting in higher tolerance to oxidative stress compared with the control plant.

• 생명과학회지
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• 제23권8호
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• pp.989-997
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• 2013

금은화의 메탄올 추출에 의한 유기 용매별 분획에서 항산화 효과를 근거로 에틸 아세테이트 분획에서 $H_2O_2$로 유도된 RAW 264.7 세포독성에 대한 세포보호 효과와 유전자 발현 양상을 분석하였다. 용매별 분획의 항산화 활성은 시료의 농도가 증가할수록 DPPH에 대한 전자공여능도 증가하였으며, $ED_{50}$은 에틸 아세테이트 분획에서 $39.56{\mu}g/ml$로 가장 높게 나타났다. 또한 $H_2O_2$에 의해 유도된 Raw 264.7 세포사멸(($IC_{50}$)에 대하여 에틸 아세테이트 분획은 농도 의존적으로 유의적인 세포 생존율과, $100{\mu}g/ml$의 농도에서 82.49%의 세포보호 효과를 나타내었다. 한편 $IC_{50}$의 $H_2O_2$ 독성에 대한 에틸 아세테이트 분획의 Raw 264.7 세포보호 효과에 관련된 유전자 발현의 패턴은 BHA와 유사한 것으로 나타났다. 항산화 관련 유전자군의 비교 분석에서는 에틸 아세테이트 분획과 BHA는 매우 유사한 유전자 발현 양상을 보였으나, 세포 내 주요 항산화 효소를 만드는 유전자 중 하나인 heme oxygenase 1 (Hmox1) 유전자의 발현 정도가 에틸 아세테이트 분획에서 4 배 이상 증가하였다. 항염증 관련 유전자군의 비교에서는 T-box transcription factor (Tbx21)가 BHA 처리군에서는 2 배 감소하였으나 에틸 아세테이트 분획의 처리군에서는 오히려 약 2 배 증가한 것으로 나타났다.

• 대한의생명과학회지
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• 제28권1호
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• pp.25-33
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• 2022

The imbalance of oxidative stress due to the excessive production of reactive oxygen species (ROS) leads to the pathogenesis of liver disease. To prevent this, the role of antioxidant mechanisms is important. Antioxidant studies have been reported on the Filipendula glaberrima Nakai. However, studies applied to HepG2 cells, which are human liver cells, have not yet been conducted. In this study, 70% ethanol extract of Filipendula glaberrima Nakai (FGE) was prepared and antioxidant activity was investigated. It was confirmed whether FGE pretreatment could reduce hydrogen peroxide-induced oxidative stress in HepG2 cells. The increase in gene expression of antioxidant biomarkers and the scavenging ability of ROS were measured, and Hoechst 33342 staining was used to know the inhibitory effect of the apoptosis. As a result, FGE significantly increased SOD (2.6-fold), CAT (4.4-fold), MT-1A (3.1-fold), GPx (4-fold), and G6PD (2.4)-fold compared to the H₂O₂-treated group. FGE directly inhibited ROS production from 13.4 to 3.6 (the fluorescence mean of DCF-DA) and also reduced apoptotic cells from 45% to 10% (Hoechst 33342 staining) at 2.5 ㎍/mL. These results demonstrate the excellent antioxidant activity of FGE and show that it can be used as a functional food to prevent liver disease.

• 생명과학회지
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• 제7권3호
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• pp.172-175
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• 1997

Transgenic hybrid poplar subclones containing herbicide glyphosate resistant gene (aroA) were treated with ozone at the concentration of 100 nL L$^{-1}$ for 6 hr for 5 consecutive days. The foreign gene expression in leaves of all treated plants was reduced both at transcriptional and translational levels confirmed by Northern and Western blot analysis, respectively, as compared to non-treated control plants. These results indicated that the expression of foreign gene in transgenic plants could be affected by the environmental stresses. Thus, the performance of transgenic plants cultivated on field conditions may be lower than they are expected.

• Molecular & Cellular Toxicology
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• 제5권1호
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• pp.51-57
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• 2009

Quantum Dot (QD) nanoparticles are used in various industrial applications, such as diagnostic, drug delivery, and imaging agents of biomedicine. Although QDs are extensively used in many medical science, several studies have been demonstrated the potential toxicity of nanoparticles. The first objective of this study was to investigate the nanotoxicity of QDs in the HaCaT human keratinocyte cell line by focusing on gene expression pattern. In order to evaluate the effect of QDs on gene expression profile in HaCaT cells, we analyzed the differential genes which related to oxidative stress and antioxidant defense mechanisms by using human cDNA microarray and PCR array. A human cDNA microarray was clone set, which was sorted for a list of genes correlated with cell mechanisms. We tried to confirm results of cDNA microarray by using PCR array, which is pathway-focused gene expression profiling technology using Real-Time PCR. Although we could not find the exactly same genes in both methods, we have screened the effects of QDs on global gene expression profiles in human skin cells. In addition, our results show that QD treatment somehow regulates cellular pathways of oxidative stress and antioxidant defense mechanisms. Therefore, we suggest that this study can enlarge our knowledge of the transcriptional profile and identify new candidate biomarker genes to evaluate the toxicity of nanotoxicology.