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Molecular biological study on β-amyloid-induced cytotoxicity

Research Project

Project/Area Number 12670944
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Psychiatric science
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

MONJI Akira  Department of Neuropsychiatry, KYUSHU UNIVERSITY, lecturer, 医学部・附属病院, 助手 (00294942)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsAlzheimer's disease / β-amyloid / cytotoxicity / free radical / PC 12 cell / aggregation / calcium
Research Abstract

We investigated whether or not the Aβ peptide itself spontaneously generates free radicals using electric spin resonance (ESR) spectroscopy while also monitoring the aggregational state of Aβ and Aβ-induced cytotoxicity. The present results demonstrated a four-line spectrum in the presence of both Aβ40 and Aβ42 with N-tert-butyl-α-phenylnitrone (PBN) but not in the presence of PBN alone in phosphate-buffered saline (PBS). The fact that the four-line spectrum obtained for the Aβ/PBN in PBS was completely abolished in the presence of the iron-chelating agent Desferal demonstrated the observed four-line spectrum to be iron-dependent. The present study also revealed that either Aβ40 or Aβ42 with PBN in phosphate buffer (PB) did not produce any definite four-line spectrum. Both a thioflavine-T (Th-T) fluorometric assay and circular dichroism (CD) spectroscopy showed the amyloid fibril formation of Aβ in PBS to be much higher than that of Aβ in PB. Moreover, Aβ-induced cytotoxicity assays showed Aβincubated in PBS to be more cytotoxic than that incubated in PB. These results thus suggest that Aβ- associated free radical generation is strongly influenced by the aggregational state of the peptides. Negative stain electron microscopy has also shown that its generation is only observed transiently during the process of Aβ fibril formation.

Report

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

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Akira Monji: "Inhibition of Aβ fibril formation and Aβ-induced cytotoxicity by senile plaque associated proteins"Neuroscience Letters. 278(1-2). 81-84 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akira Monji: "The relationship between aggregational state of Aβ peptides and free radical generation by the peptides"Journal of Neurochemistry. 77. 1425-1432 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akira Monji: "The relationship between Aβ-associated free radical generation and Aβ fibril formation revealed by Thioflavine-T fluorometric assay and negative stain electron microscopy"Neuroscience Letters. 304(1/2). 65-68 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akia Monji: "Amyooid-β-protein (Aβ) (25-35)-associated free radical generation is strongly influenced by the aggregational state of the peptides"Life Scieuces. 70/7. 833-841 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akira Monji et al: "Inhibition of Aβ fibril formation and Aβ-induced cytotoxicity by senile plaque-associated proteins"Neuroscience Letters. Vol.278(1-2). 81-84 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akira Monji et al: "The relationship between aggregational states of Aβ peptides and free radical generation by the peptides"Journal of Neurochemistry. Vol.77. 1425-1432 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akira Monji et al: "The relationship between Aβ-associated free radical generation and Aβ fibril formation revealed by Thioflavine-T fluorometric assay and negative stain electron microscopy"Neuroscience Letters. Vol.304(1-2). 65-68 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akira Monji et al: "Amyloid-β-protein (Aβ) (25-35)-associated free radical generation is strongly influenced by the aggregational state of the peptides"Life Sciences. Vol.70/7. 833-841 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Akira Monji: "Inhibition of Aβ fibril fernation and Aβ-induced cytotexicity by senile plague-associated proteins"Neuroscience Letters. 278(1-2). 81-84 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Akira Monji: "The relationship between aggregational states of NP peptides and free radical generation by the peptides"Journal of Neurochemistry. 77. 1425-1432 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Akira Monji: "The relationship between Aβ-associated free radical generation and Aβ fibril formation revealed by Thioflavine-T fluenmetric acsay and negative stain electron microscopy"Neuroscience Letters. 304(1/2). 65-68 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Akira Monji: "Amyloid-β-protein (Aβ)(25-35)-associated free radical generation is strongly intluencud by the aggregational state of the peptides"Life Sciences. 70(7). 833-841 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Akira Monji et al: "Inhibition of Aβ fibril formation and Aβ-induced cytotoxicity by senile plaque-associated proteins."Neuroscience Letters. 278(1-2). 81-84 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Akira Monji et al: "The relationship between the aggregational state of Aβ peptides and free radical generation by the peptides."Journal of Neurochemistry. 76(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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