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微生物感染・炎症における遺伝子損傷の分子メカニズム

Research Project

Project/Area Number 11770077
Research Category

Grant-in-Aid for Encouragement of Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Pathological medical chemistry
Research InstitutionKumamoto University

Principal Investigator

澤 智裕  熊本大学, 医学部, 助手 (30284756)

Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
KeywordsNO / パーオキシナイトライト / スーパーオキサイド / ニトログアノシン / ニトロチロシン / 炎症 / 遺伝子変異
Research Abstract

本研究では、微生物感染に伴う炎症局所において産生する活性酸素(スーパーオキサイドや過酸化水素)や窒素酸化物(一酸化窒素など)およびそれらの反応産物(パーオキシナイトライトなど)によりもたらされる遺伝子損傷を明らかにし、炎症から発癌へと続く分子メカニズムにおける活性酸素、窒素酸化物の役割を検討する。昨年度は、パーオキシナイトライトがヌクレオシド、RNA、DNAのグアニンを効率良くニトロ化し、ニトログアニン(ニトログアノシン)を生成することを報告した。また、生成したニトログアノシンがシトクローム還元酵素の存在下に顕著なスーパーオキサイドを産生することを明らかにした。本年度はさらに、このようなスーパーオキサイドの生成が細胞内で起こるのかを蛍光指示薬である2,7-ジクロロフルオレシンを用いたフローサイトメーターにより検討した。その結果、培養細胞をニトログアノシンとともに培養すると、濃度依存的に細胞内にオキシダントの生成が見られた。以上の結果は、パーオキシナイトライトによるグアニンニトロ化が細胞内で新たな活性酸素の生成をもたらし、細胞の酸化ストレスを高めることを示唆しており、パーオキシナイトライトによる遺伝子変異作用を解明する上で重要な知見を与えると考えられる。

Report

(2 results)
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Sawa,T., et al.: "Tyrosine nitration by peroxynitrite formed from nitric oxide and superoxide geneated by xanthine oxidase"J.Biol.Chem.. 275. 32467-32474 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Sawa,T., et al.: "Tumor-targeting chemotherapy by a xanthine oxidase-polymer conjugate that generates oxygen-free radicals in tumor tissue"Cancer Res.. 60. 666-671 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kanazawa A. et al.: "Formation of abasic sites in DNA by t-butyl peroxyl radicals : implication for potent genotoxicity of lipid peroxyl radicals"Cancer Letters. 156. 51-55 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kuwahara H. et al.: "Helicobacter pylori urease suppresses bactericidal activity of peroxynitrite via carbon dioxide production"Infect.Immun.. 68. 4378-4383 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Akaike,T., et al.: "Viral mutation accelerated by nitric oxide production during infection in vivo"FASEB J.. 14. 1447-1454 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Maeda H. et al.: "Tumor vascular permeability and the EPR effect in macromolecular therapeutics : a review"J.Control.Rel.. 65. 271-284 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Kanazawa,A., et al.: "Generation of lipid peroxyl radicals from edible oils and their biological activities : a need for consideration for anti-radical components and purification processing"BioFactors. 13. 187-193 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Maeda,H., et al: "Mechanism of tumor-targeted delivery of macromolecular drugs, including the EPR effect in solid tumor and clinical overview of the prototype polymeric drug SMANCS"J.Control.Rel.. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Maeda H.& Sawa,T.: "Biomaterials and Drug Delivery toward New Millenium"Han Rim Won Publishing Co.,Korea. 333-344 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Sawa T.& Maeda H.: "Polymers in Medicine and Biotechnology"Citus Ltd.,London(in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Sawa,T.,et al.: "Alkylperoxyl radical-scavenging activity of various flavonoids and other phenolic compounds:Implications for the anti-tumor-promoter effect of vegetables"J.Agric.Food Chem.. 42. 397-402 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Maeda,H.,et al.: "Free radical generation from heterocyclic amines by cytochrome b5 reductase in the presence of NADH"Cancer Letters. 143. 117-121 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Inoue,K..et al.: "Nitrosothiol formation catalyzed by ceruloplasmin:Implication for cytoprotective mechanism in vivo"J.Biol.Chem.. 27069-27075 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Sawa,T.,et al.: "Tumor-targeting chemotherapy by a xanthine oxydase-polymer conjugate that generates oxygen-free radicals in tumor tissue"Cancer Res.. 60. 666-671 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Akaike.T.,et al.: "Viral mutation accelerated by nitric oxide production during infection in vivo"FASEB J.. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Sawa,T.,et al.: "The Biology of Nitric Oxide Part 7(eds.S.Moncada,L.Gustafsson,P.Wiklund and E.A.Higgs)"Portland Press Ltd.,London(in press). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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