• Title, Summary, Keyword: comet assay

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Benzopyrene에 노출된 광어(Conger myriaster) 혈액 cells과 개조게(Saxidomus purpurata) 조직 cells을 이용한 in vivo DNA single strand breakage

  • 김소정;오로라;하병혁;최은석;장만;이택견
    • Proceedings of the Korea Society of Environmental Biology Conference
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    • pp.145-153
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    • 2002
  • 유해 화학 물질류에 의해 오염된 해양 환경 시료의 환경독성 수준을 평가하기 위하여 다양한 화학물질에 대해 민감성이 우수한 생물학적 독성평가기법을 개발 하고자하였다. 지속성 유기오염 물질 중 다환 방향 족 탄화수소(PAHs)를 처리한 광어(Conger myriaster)와 개조개(Saxidomus pupurata)의 DNA 손상정도를 single cell gel electrophoresis assay(comet assay)를 통해 분석하였다. PAHs 중 광양만에서 높은 농도로 검출되는 benzo(a)pyrene을 농도별(0, 10, 50, 100 ppb)로 처리한 후 2일과 4일에 광어의 혈액세포와 개조개의 근육세포를 채취해 comet assay를 실시하였다. benso(a)pyrene에 대한 DNA 손상정도를 처리된 농도와 생물종에 따라 다르게 나타났는데 광어의 혈액세포는 2일에 가장 DNA 손상정도가 높았고, 4일에는 회복되는 경향을 나타냈다. 개조개의 근육세포는 시간이 지나면서 DNA 손상정도가 증가하는 경향을 보였다. 이와 같은 결과는 comet assay 기법이 유해 화학물질로 오염된 해양생물 종의 환경독성을 검색하는 유용한 수단이 될 수 있음을 보여준다.

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13-Week Oral Gavage Toxicity with Sophora Japonica Linne Seed Extract in Sd Rats

  • Lee, Jae-Hyung;Kim, Il-Yong;Hyun, Chang-Kee
    • Proceedings of the Korean Society of Toxicology Conference
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    • pp.133-133
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    • 2003
  • In recent years. attention has focused on the application of the alkaline single cell gel electrophoresis (SCGE or Comet) assay in environmental mutagenesis. To evaluate the suitability of the assay as a monitoring. technique, the DNA damages in liver cells and erythrocytes of carp (Cyprinus carpio) exposed to benzo[${\alpha}$]pyrene (B[${\alpha}$]P) were estimated comparatively with the in vivo Comet assay and the micronucleus test (MNT).(omitted)

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DNA Strand Breaks in Mitotic Germ Cells of Caenorhabditis elegans Evaluated by Comet Assay

  • Park, Sojin;Choi, Seoyun;Ahn, Byungchan
    • Molecules and Cells
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    • v.39 no.3
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    • pp.204-210
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    • 2016
  • DNA damage responses are important for the maintenance of genome stability and the survival of organisms. Such responses are activated in the presence of DNA damage and lead to cell cycle arrest, apoptosis, and DNA repair. In Caenorhabditis elegans, double-strand breaks induced by DNA damaging agents have been detected indirectly by antibodies against DSB recognizing proteins. In this study we used a comet assay to detect DNA strand breaks and to measure the elimination of DNA strand breaks in mitotic germline nuclei of C. elegans. We found that C. elegans brc-1 mutants were more sensitive to ionizing radiation and camptothecin than the N2 wild-type strain and repaired DNA strand breaks less efficiently than N2. This study is the first demonstration of direct measurement of DNA strand breaks in mitotic germline nuclei of C. elegans. This newly developed assay can be applied to detect DNA strand breaks in different C. elegans mutants that are sensitive to DNA damaging agents.

Application of Single Cell Gel Electrophoresis for Detection of DNA Single Strand Breaks in DNA of Fish Blood Cell (어류혈구세포에 있어서 Single Cell Gel Electrophoresis를 응용한 DNA Single Strand Breack의 측정)

  • KIM Gi Beum;LEE Richard F.;MARUYA Keith A.
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.36 no.4
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    • pp.346-351
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    • 2003
  • Single-cell gel electrophoresis (comet assay) was used to detect DNA single strand break in blood cells from several marine fish species. Three fish species were collected from Georgia coastal area. Mummichog, Fundulus heteroclitus showed higher DNA damage than sea bass, Lateolabrax japonicus and trout, Oncorhynchus masou masou under the same experimental conditions. Mummichogs had more alkaline-labile sites on their DNA than other fish species. The comet assay with mummichog blood cells at pH 12.5 showed a dose-response curve with the increasing concentrations of hydrogen peroxide. While the isolated leucocytes showed no increase of DNA damage after in vitro exposure to 2-methyl-1,4-naphthoquinone (MNQ), erythrocytes showed dose-dependent DNA damage. These results indicate that the comet assay can be applied successfully as a bioassay using erythrocyte for environmental monitoring.

DNA Damage Effect of Botanical Insecticides Using Chinese Hamster Lung Cells

  • Kim, Areumnuri;Jeong, Mihye;Park, Kyung-Hun;Chon, Kyongmi;Cho, Namjun;Paik, Min Kyoung
    • Korean Journal of Environmental Agriculture
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    • v.34 no.4
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    • pp.350-354
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    • 2015
  • BACKGROUND: Botanical insecticides, especially Azadirachta Indica extract (AIE) and Sophorae radix extract (SRE) are widely used in Agriculture field. In our previous studies on genotoxicity test of AIE and SRE samples, a suspicious clastogenic properties was shown. Herein, we investigated the DNA damage effect of these botanical insecticide samples through the in vitro comet assay. METHODS AND RESULTS: Chinese hamster lung (CHL) fibroblast cell line was used, and methyl methanesulphonate was as positive control. Respective two samples of AIE and SRE were evaluated using Single Cell Gel Electrophoresis (Comet) assay and measured as the Olive tail moment (OTM). Results from this study indicated that all tested AIE and SRE samples did not show DNA damage in comet assay using CHL cells, compared with control. CONCLUSION: AIE and SRE samples used in this study were not cause genetic toxicity and are suitable for use as organic materials.

Evaluation of protective effect of peach kernel extracts on radiation-induced DNA damage in human blood lymphocytes in the single cell gel electrophoresis assay (단세포 겔 전기영동법을 이용한 사람 림프구 DNA 손상에 대한 복숭아씨 추출물의 방사선 방어효과 평가)

  • Kim, Jin-Kyu;Park, Tae-Won;Lee, Chang-Joo;Chai, Young-Gyu
    • Journal of Radiation Protection and Research
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    • v.24 no.2
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    • pp.93-99
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    • 1999
  • The alkaline single-cell gel electrophoresis (SCGE) assay, called the comet assay, has been applied to the detection of DNA damage from a number of chemical and biological factors in vivo and in vitro. The comet assay is a novel method to assess DNA single-strand breaks, alkali-labile sites in individual cells. The effect of peach kernel extracts on radiation-induced DNA damage in human blood lymphocytes was evaluated by the SCGE assay. The lymphocytes, with or without pretreatment of the extracts, were exposed to 0, 0.1, 0.3, 0.5, 1.0 and 2.0 Gy of $^{60}Co$ gamma ray. Significantly increased tail moment, which was a marker of DNA strand breaks in the comet assay, showed an excellent dose-response relationship. The treatment of the peach kernel extracts reduced the DNA damage by 30 % in irradiated groups as compared to that in non-treated control groups. The result indicates that the extracts shows radioprotective effect on lymphocyte DNA when assessed by the comet assay.

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EVALUATION OF THE GENOTOXICITY OF FERRIC SULFATE BY COMET ASSAY (Comet assay를 이용한 Ferric Sulfate의 유전자 독성에 대한 연구)

  • Kang, Ho-Seung;Kim, Shin;Jeong, Tae-Sung;Park, Hae-Ryoun
    • THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
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    • v.27 no.1
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    • pp.77-84
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    • 2000
  • Although ferric sulfate has been proposed as an alternative to formocresol in pulpotomy treatment in primary teeth, it has been given little concern regarding its cytotoxicity and mutagenicity. In the present study, we assessed the in vitro genotoxic effect of a ferric sulfate on human gingival fibroblast cell line (HGF-1). DNA damage was evaluated using comet assay (single cell alkaline gel electrophoresis) and obtained the results as follows: 1. A dose-response relationship was found between ferric sulfate concentrations (0 to 5mM) and DNA damages. 2. Above the concentration of 0.1mM, DNA damage was significantly increased than those of the control (p<0.05). 2. At the fixed concentration of 0.05mM, no significant difference was found between exposure time and DNA damage. These findings suggest that ferric sulfate as a pulpotomy agent can induce DNA damage in human gingival fibroblasts.

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IN VITRO AND IN VIVO EVALUATION OF THE GENOTOXIC EFFECT OF 2-BROMOPROPANE BY THE ALKALINE SINGLE-CELL GEL ELECTROPHORESIS(COMET) ASSAY

  • Kim, Soo-Jin;Yu, Il-Je;Lee, Yong-Mook;Chung, Ho-Keun;Maeng, Seung-Hee
    • Proceedings of the Korean Society of Toxicology Conference
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    • pp.146-146
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    • 2002
  • The alkaline single cell gel electrophoresis (comet) assay was used to clarify in vitro and in vivo genotoxicity of 2-bromopropane (2-BP). For in vitro studies, fresh medium containing 2-BP (2.50, 1.00, 0.50, 0.25, 0.10, 0.05, 0.01 mM, and vehicle control) were added in human lymphocytes.(omitted)

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DNA Damage Induced by New Pophyrins of Different Chemical Structure

  • Galina Hovhannisyan;Samvel Haroutiunian;Kristina Margaryan;Robert Ghazaryan;Rouben Aroutiounian
    • Korean Journal of Environmental Biology
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    • v.23 no.4
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    • pp.379-382
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    • 2005
  • The new cationic meso-substituted N-quarternized 4-pyridylporphyrins and their metal derivatives were synthesized as novel chemotherapeutics. The level of DNA damage induced by porphyrins TOBut4PyP, TOBut4PyP, TOEt4PyPMn and TOBut4PyPMn and its dependence on the chemical structure of compounds were analyzed by the Comet-assay. On the base of data obtained, the investigated porphyrins may be arranged by their genotoxic activity in the following order: TOEt4PyP>TOEt4PyPMn>TOBut4PyP>TOBut4PyPMn. Thus, i) the genotoxicity of the Mn-derivatives of TOEt4PyP and TOBut4PyP is higher than the original porphyrins and ii) the genotoxicity of TOEt4PyP and TOEt4PyPMn is increased after substitution of a butyl radical for ethyl one. The applied Comet-assay permits to reveal the dependence of DNA damage induction on the chemical structure of porphyrins.

Effect of N-acetyl-L-cysteine on human chronic myeloid leukemia cells KCL22 treated with mitomycin C

  • Simonyan, Anna;Hovhannisyan, Galina;Aroutiounian, Rouben;Kim, Jin Kyu
    • Journal of Ecology and Environment
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    • v.37 no.1
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    • pp.31-34
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    • 2014
  • The effectiveness of N-acetyl-L-cysteine (NAC) to protect blood cells against Mitomycin C (MMC) induced genotoxicity was investigated in human chronic myeloid leukemia cells (KCL22) using the alkaline comet assay. The comet assay was selected as sensitive and rapid method for analysis of DNA damage and repair in individual cells. NAC treatment alone did not produce any damage in KCL22 cell. But NAC was found to be effective in reducing genotoxic damage in KCL22 cells exposed to MMC. These results confirm the literature data that, given the safety and ability to reduce DNA damage. NAC may be useful to prevent drug-mediated genotoxicity.