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Intracellular localization of Wilson disease protein(ATP7B), a copper-transporting ATPase.

Research Project

Project/Area Number 12670535
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Gastroenterology
Research InstitutionKurume University school of Medicine

Principal Investigator

HARADA Masaru  Kurume University school of Medicine, Assistance, 医学部, 助手 (00241175)

Co-Investigator(Kenkyū-buntansha) KOGA Hironori  Kurume University school of Medicine, Assistance, 医学部, 助手 (90268855)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsATP7B / bile / copper / hepatocytes / Wilson disease / ウイルソン病
Research Abstract

Wilson disease is a genetic disorder characterized by the accumulation of copper in the body due to a defect of biliary copper excretion from hepatocytes. The intracellular localization of Wilson disease gene product, ATP7B, was investigated by expressing ATP7B tagged with green fluorescent protein (GFP)(GFP-ATP7B) in cultured cells. Intracellular organelles were visualized by fluorescence microscopy. GFP-ATP7B colocalized with the late endosome markers, but not with markers for the Golgi apparatus and lysosomes. Various mutations have been documented in patients with Wilson disease. The clinical manifestations vary greatly among the patients, however, there is little information on the genotype-phenotype correlation. We investigated the distribution of a common ATP7B mutant His 1069Gl and a mutant Asp l270Ser by expressing the mutants tagged with GFP. While Asp l270Ser mutant localized in the late endosomes, His 1069Gln mutant did not locate in the late endosomes and was degraded by the proteasomes in the cytoplasm. Furthermore, His 1069Gl formed aggresomes composed of the degradates and intermediate filamentsat the microtubule-organizing center. These aggresomes were similar to Mallory bodies on electron microscopy. ATP7B localized in the late endosomes in both copper-depleting and copper-loaded conditions. ATP7B seems to translocate copper from the cytosol into the late endosomes, and copper may be excreted to bile via lysosomes. The disturbed incorporation of copper into the late endosomes caused by mutated ATP7B must be the main defect in Wilson disease. The different protein properties of ATP7B mutants may in part explain the variety of clinical spectrums in patients with Wilson disease.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] Masaru Harada et al.: "Role of ATP7B in biliary copper excretion in a human hepatoma cell line and normal rat hepatocytes"Gastroenterology. 118. 921-928 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Masaru Harada et al.: "Copper does not alter the intracellular distribution of ATP7B, a copper-transportingATPase"Biochem.Biophys.Res.Commun.. 275. 871-876 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 原田 大: "ウィルソン病蛋白(ATP7B)を介した肝細胞から胆汁中への銅排泄機構"消化と吸収. 23. 22-24 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 原田 大: "銅代謝と関連遺伝子"肝胆膵. 41・3. 373-378 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 山田剛太郎: "肝と金属代謝-病態と治療をめぐる最近の知見-"肝胆膵. 41・3. 427-442 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Masaru Harada et al.: "A mutation of the Wilson disease protein, ATP7B, is degraded in the proteasomes and forms protein aggregates"Gastroenterology. 120. 967-974 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 原田 大: "ウイルソン病蛋白(ATP7B)は肝細胞後期エンドゾームに存在する"肝サイトスケレトン研究会誌. 11. 23-25 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Masaru Harada et al.: "Mallory bodies, like the mutant of ATP7B seen in Wilson's disease, are aggresomes. Reply"Gastroenterology. 121. 1264-1266 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 原田 大: "ウィルソン病遺伝子産生産物(ATP7B)の細胞内局在とその点突然変異の影響"肝サイトスケレトン研究会誌. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Masaru Harada: "Wilson disease"Med.Electron.Microsc.. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 原田 大: "肝臓フォーラム00'記録集"医事出版社. 223 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 原田 大: "消化器の高発癌状態"アークメディア. 143 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Harada M et al: "A mutation of the Wilson disease protein, ATP7B, is degraded in the proteasomes and forms protein aggregates."Gastroenterology. 120. 967-974 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Harada M et al: "Role of ATP7B in biliary copper excretion in a human hepatoma cell line and normal rat hepatocytes"Gastroenterology. 118. 921-928 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Harada M et al: "Copper does not alter the mtracellular distribution of ATP7B, a copper-transportingATPase"Biochem Biophys Res Comm. 275. 871-876 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Harada M et al: "Mallory bodies, like the mutant of ATP7B seen in Wilson's disease, are aggresomes"Gastroenterology. 121. 1264-1266 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Harada M. Wilson disease: Med Electron Microso. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Masaru Harada et al.: "A mutation of the Wilson disease protein, ATP7B, is degraded in the proteasomes and forms protein aggregates"Gastroenterology. 120. 967-974 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 原田 大 他: "ウイルソン病蛋白(ATP7B)は肝細胞後期エンドゾームに存在する"肝サイトスケレトン研究会誌. 11. 23-25 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Masaru Harada et al.: "Mallory bodies, like the mutant of ATP7B seen in Wilson's disease, areaggresomes. Reply"Gastroenterology. 121. 1264-1266 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 原田 大 他: "ウイルソン病遺伝子産生産物(ATP7B)の細胞内局在とその点突然変異の影響"肝サイトスケレトン研究会誌. (in press).

    • Related Report
      2001 Annual Research Report
  • [Publications] Masaru Harada: "Wilson disease"Med Electron Microsc. (in press).

    • Related Report
      2001 Annual Research Report
  • [Publications] 原田 大: "肝臓フォーラム00'記録集"医事出版社. 223 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 原田 大: "消化器の高発癌状態"アークメディア. 143 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Masaru Harada: "Role of ATP7B in biliary copper excretion in a human hepatoma cell line and normal rat hepatocytes."Gastroenterology. 118. 921-928 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masaru Harada: "Copper does not alter the intracellular distribution of ATP7B, a copper-transporting ATPase."Biochem Biophys Res Comm. 275. 871-876 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 原田大: "ウイルソン病蛋白(ATP7B)を介して肝細胞から胆汁中への銅排泄機構"消化と吸収. 23. 22-24 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 山田剛太郎: "肝と金属代謝:病態と治療をめぐる最近の知見"肝胆膵. 41. 373-378 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masaru Harada: "A Mutation of Wilson's disease protein, ATP7B, Is Degraded in the Proteasomes and Forms Protein Aggregates."Gastroenterology. (in press). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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