• 약학회지
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• 제54권6호
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• pp.423-428
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• 2010

The aim of this study was to evaluate the in vivo effect of galangin and the 70% ethanolic extract of Alpinia officinarum (AO) toward $KBrO_3$-induced DNA and chromosomal damage in mice. Galangin and AO inhibited the formation of 8-hydroxy-2'-deoxyguanosine (8-OH2'dG) as an indicator of DNA oxidative damage in the liver cell. Galangin and AO showed the inhibitory effect on the formation of DNA single strand break in the splenocyte by single cell gel electrophoresis (SCGE) assay and also inhibited micronucleated reticulocyte (MNRET) formation of peripheral blood in tail blood of mice. Vit-E revealed antigenotoxic effects in DNA and chromosome levels, but galangin was more potent active compound compare to vit-E under our experimental conditions. The results suggest that the extract of Alpinia officinarum containing galangin can modify the oxidative DNA and chromosomal damage and may act as chemopreventive agent against oxidative stress in vivo.

• 한국자기공명학회논문지
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• 제20권3호
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• pp.71-75
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• 2016

The replication protein A (RPA) plays a crucial role in DNA replication, recombination, and repair. RPA consists of 70, 32 and 14 kDa subunits and has high single-stranded DNA (ssDNA) binding affinity. The largest subunit, RPA70, mainly contributes to bind to ssDNA as well as interact with many cellular and viral proteins. In this study, we performed nuclear magnetic resonance experiments on the complex of the DNA binding domain A of human RPA70 (RPA70A) with ssDNA, d(CCCCC), at various pH, to understand the effect of pH on the ssDNA binding of RPA70A. The chemical shift perturbations of binding residues were most significant at pH 6.5 and they reduced with pH increment. This study provides valuable insights into the molecular mechanism of the ssDNA binding of human RPA.

• 한국식품영양과학회지
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• 제39권6호
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• pp.805-812
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• 2010

본 연구에서는 조리법에 따른 마늘의 항 유전 독성 효과를 확인하기 위해 생마늘, 구운 마늘, 초절임 마늘의 에탄올 또는 메탄올 추출물을 백혈구에 처리한 후 comet assay를 수행하였다. 그 결과 조리 방법, 추출 용매에 상관없이 모든 추출물에서 DNA 손상 억제 효과가 것으로 나타났으며 활성산소인 $H_2O_2$에 대한 DNA 손상 억제 효과는 생마늘 메탄올 추출물에서, 지질과산화물인 HNE에 대한 DNA 손상 억제 효과는 구운 마늘 메탄올 추출물에서 높은 것으로 나타났다. 또한 $H_2O_2$로 유도한 스트레스에서는 마늘 추출물의 농도를 1, 5, 10, 50 ${\mu}g$/mL으로 증가시킬수록 DNA 손상 억제능이 좋은 것으로 나타난 반면 HNE로 스트레스를 유도한 군에서는 저농도인 1 ${\mu}g$/mL에서 오히려 높은 효능이 나타났다. 따라서 마늘의 항 유전 독성 효과는 한국인의 일반적인 마늘 섭취 형태인 생마늘, 구운 마늘, 초절임 마늘에 상관없이 탁월한 것을 알 수 있었다. 이와 같은 마늘의 항 유전 독성효과는 식재료로써의 마늘의 소비 및 의약품 소재로써의 이용성을 증진시킬 수 있는 자료가 될 것으로 사료된다.

• Natural Product Sciences
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• 제20권4호
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• pp.237-242
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• 2014

Plant extracts produced from branches of Crataegus pinnatifida and barks of Crataegus pinnatifida inhibited ethanol-induced cytotoxicity and DNA damage in liver cells. Furthermore, these two extracts inhibited the expression and activities of CYP2E1 enzyme. Cinnamomum cassia had a better effect on inhibition of DNA damage than Crataegus pinnatifida, as well as showed a high tendency to inhibit CYP2E1 expression and catalytic activities. It is considered that extracts produced from Crataegus pinnatifida or Cinnamomum cassia have an effect to reduce ethanol-induced cytotoxicity and DNA damage in liver cells. Therefore, we suggest to use Crataegus pinnatifida and Cinnamomum cassia and their ingredients as potential candidate substances to prevent and treat ethanol-induced cytotoxicity and genotoxicity in liver cells.

• Archives of Pharmacal Research
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• 제17권3호
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• pp.199-203
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• 1994

Several lines evidence indicate that microtubule depolymerization initiates DNA synthesis or enhances the effects of serum or purified growth factors in many types of fibroblasts. Yet little is known about the intracellular events responsible for the mitogenic effect of microtubule disrupting agents. The effects of antitubulin agents on DNA synthesis in sparse and dense cultures in the presence or absence of serum and possible involvement of G-proteins in their mitotic action were examined. In these studies, colchicine by itself appeared to be mitogenic only for confluent quiesecent human lung fibroblasts. In sparse culture, however, colchicine inhibited serum-stimulated DNA synthesis. Colcemid, another antitubulin agent, showed similar effects of growth inhibition and stimulation in sparse and confluent cultures while lumicolhicine, inactive colchicine, did not. The mitogenic effect of two antitubulin agents, colchicine and colcemid, was partially inhibited by pertussis toxin. These data suggest that microtubular integrity is associated with the expression of either negative or positive control on DNA synthesis and mitogenic effect of antitubulin agents may be partially mediated by pertussis toxin-sensitive G protein.

• 한국환경성돌연변이발암원학회지
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• 제20권1호
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• pp.7-13
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• 2000

The mechanisms of benzene toxicity is not fully elucidated, although the metabolism of benzene is very well understood. In order to study the mechanism of benzene toxicity, we investigated DNA damage induced by benzene metabolite, 1,2,4-benzenetriol (BT) in HL-60 cells by alkaline comet assay. To investigate the mechanism of cellular DNA damage induced by BT, the cells were treated with antioxidant such as vitamin C, SOD, catalase, and chelating agent such as deferoxamine (DFO), bathocuproinedisulfonic acid (BCDS). BT induced DNA damage in dose-dependent manner at concentration between 10$\mu\textrm{m}$ and 100$\mu\textrm{m}$. The antioxidant vitamin C itself induced DNA damage at higher concentration. The DNA damage induced by BT in HL-60 cells was protected at low concentraiton of vitamin C whereas no protective effect was found at high concentration. In hibitory effect of SOD on DNA damage by BT was observed and this suggested that BT produce superoxide anion (O2-) causing DNA damage. Catalase protected BT-induced DNA damage suggesting that BT produce H2O2 during autooxidation of BT. Both Fe(II)-specific cheiating agent, deferoxamine (DFO) and Cu(I)-specific chelating agent, bathocuproinedisulfonic acid (BCDS) inhibited BT0induced DNA damage. This suggested that DNA damage was caused by active species which was produced DAN damage. This suggested that DNA damage was caused by active species which was produced by the autooxidation of BT in the presence of Cu(II) and Fe(III). These findings suggest that reactive oxygen species play an important role in the mechanism of toxicity induced by benzene metabolites.

• Bulletin of the Korean Chemical Society
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• 제30권5호
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• pp.1031-1034
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• 2009

Fluorescence of quinolones including norfloxacin, ciprofloxacin and S- and R-ofloxacin is quenched upon association with single and double-stranded DNA (ss- and ds-DNA). The ratios of fluorescence intensity in the presence of DNA to its absent were plotted with respect to the DNA concentration to construct the Stern-Volmer plot. The slope of the Stern-Volmer plot become larger as the temperature is lowered, ensuring that the fluorescence quenching is static process, i.e., the fluorescence is quenched by formation of the non-fluorescent complex between quinolone and DNA. In the static quenching mechanism, the quenching constant which is equivalent to the slope of the Stern-Volmer plot, is considered as the equilibrium constant for the association of quinolones and DNA. From the temperature-dependent equilibrium constant, ${\Delta}H^0\;and\;{\Delta}S^0$ was obtained using the van’t Hoff relation. In general, association of the quinolone with ds- as well as ss-DNA is energetically favorable (an exothermic) process while the entropy change was unfavorable. Due to the steric effect of the substituents, the effect of the quinolone ring is smaller on the ss-DNA compared to ds-DNA.

• 한국식품위생안전성학회지
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• 제31권1호
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• pp.1-7
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• 2016

본 연구의 목적은 NIH3T3와 HepG2 세포에서 에탄올 유도 세포독성 및 유전독성에 대하여 녹차엑기스(GTE)와 epigallocatechin-3-gallate (EGCG)의 보호작용을 평가하는데 있다. 세포생존율은 MTT assay를 실시하였으며 DNA 손상도는 Comet assay로 실시한 결과 에탄올은 농도의존적인 세포독성과 유전독성을 나타내었다. 한편 GTE와 EGCG는 에탄올 유도 세포독성 및 DNA 손상에 대하여 유의성 있는 억제효과를 나타내었으며 DPPH시험과 LDL oxidation 및 8OH-2'dG 생성시험에서 항산화효과를 나타내었다. 한편 녹차성분 함유 시판 리큐르주도 순수 에탄올에 비하여 세포독성억제 및 DNA 손상억제효과를 나타내었다. 이상의 시험결과 GTE와 함유 EGCG는 항산화성 유전독성억제기전을 통한 에탄올독성저감 물질로 판단된다.

• BMB Reports
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• 제42권8호
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• pp.500-505
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• 2009

Anti-oxidative effect of Phellinus linteus (P. linteus) and red ginseng extracts on DNA damage induced by reactive oxygen species (ROS) were investigated in this study. P. linteus (PLE) and red ginseng extracts (RGE) inhibited the breaking of E. coli ColE1 plasmid DNA strands as well as nuclear DNA of rat hepatocytes damaged by oxidative stress. In addition, a reaction mixture of PLE and RGE showed synergistic inhibitory effect against DNA damage. These results suggest that PLE and RGE have a cellular defensive effect against DNA damage induced by ROS.

• 대한본초학회지
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• 제25권4호
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• pp.55-59
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• 2010

본 연구에서는 연자육의 항산화 활성을 평가하기 위해 EtOAC 분획물과 열수 추출물을 이용하여 DPPH, Hydroxyl 라디칼 소거활성과 $Fe^{2+}$ 킬레이팅 활성을 측정하였다. 또한 산화적 DNA 손상억제 효과는 ${\phi}X$-174 RF I plasmid DNA cleavage assay를 통해 평가하였다. EtOAC 분획물은 $200{\mu}g/m{\ell}$에서 DPPH, Hydroxyl 라디칼 소거활성과 $Fe^{2+}$ 킬레이팅 활성이 각각 96.54%, 55.27%, 66.17%의 활성이 나타났으며, 열추 추출물에서는 각각 21.25%, 15.72%, 30.52%로 열수 추출물에 비해 EtOAC 분획물의 항산화 활성이 높은 것으로 나타났다. 또한 ${\phi}X$-174 RF I plasmid DNA cleavage assay에서 EtOAC 추출물은 $200{\mu}g/m{\ell}$에서 76%의 높은 억제 효과가 나타난 반면, 열수 추출물은 6%의 낮은 DNA 산화적 손상억제 효과를 나타내었다. 각 추출물의 총 페놀 함량을 조사한 결과 열수 추출물에 비해 EtOAC 분획물이 높은 것으로 나타났다. 항산화 활성과 DNA 산화적 손상억제 효과가 높은 EtOAC 분획물을 GC/MS에 의해 분석한 결과, Benzeneethanol, 3-methyl-Benzoic acid, 4-ethyl-Phenol, 2,4-bis(1,1-dimethylethyl)Phenol 등 페놀성 화합물이 다수 동정되었다. 본 연구결과에 의해 연자육은 항산화 및 암 예방적 소재로써의 새로운 기능성 식품소재로서 충분한 가능성이 있다고 판단된다.