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Roles for Mint, a new family of membrane transport-associated proteins, in abnormal proteolysis and metabolism induced by oxidative stress

Research Project

Project/Area Number 11670150
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Pathological medical chemistry
Research InstitutionHyogo College of Medicine

Principal Investigator

OKAMOTO Masaya  Hyogo College of Medicine, Fifih Department of Internal Medicine, Research Associate, 医学部, 助手 (30309455)

Co-Investigator(Kenkyū-buntansha) NISHIMURA Hiroyuki  Hyogo College of Medicine, Fifth Department of Internal Medicine, Research Associate, 医学部, 助手 (20248131)
MATSUYAMA Tomohiro  Hyogo College of Medicine, Fifth Department of Internal Medicine, Assistant Professor, 医学部, 講師 (10219529)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
Keywordsmint / PTB domain / PDZ domain / APP / Alzheimer's disease / 小胞輸送 / シナプス伝達 / 酸化ストレス / 遅発性神経細胞死
Research Abstract

The mint family is evolutionarily conserved adapter proteins from C.elegans to mammalian neurons. Three mammalian isoforms, mint 1, 2, and 3, are extensively diverted in their N-terminal halves and, in striking contrast, are highly homologous to each other in their C-terminal halves containing PTB and PDZ domains that work as protein-protein interaction modules. Biochemical and genetic analyses revealed that mint 1 and LIN-10, a homolog in C.elegans, comprise macromolecular complexes in the presynaptic and postsynaptic terminals, thereby bringing synaptic vesicles to the exocytotic transmitter release site and localizing receptors and ion channels in the specific membrane domains. Amyloid precursor protein is one of the targets of the PTB domain of mint and this interaction modulates its proteolytic procedures ending up with amyloid β peptide production, but its molecular mechanism is unclear. We show by an in situ hybridization technique that mint3, a ubiquitous isoform, is expressed … More both in polar cells like neurons and in non-polar cells, such as glia and ependymal cells, in the mouse brain. In addition, a considerable amount of a human homolog mint3 (【approximately equal】70 kDa) was expressed in a human epithelial cell line. Subcellularly, mint3 is specifically enriched in vesicles in the cytoplasm, cell membrane, and Golgi complex as reserves. A series of deletions or site-directed mutations revealed that mint3 double recognizes an amyloid precursor protein-containing macromolecular complex via the PTB and PDZb domains independently and cooperatively, not only in the cytoplasmic transporting vesicles but even after amyloid precursor protein was targeted and/or inserted to the specific cell membrane domains. These results suggest that mint3 links amyloid precursor protein to other components, thereby regulating its transport, endocytosis, and metabolism. Abnormal metabolism of amyloid precursor protein causes an early-onset type of Alzheimer's disease but its molecular mechanism is incompletely understood. The present findings give morphological evidence and a molecular framework how mint interacts with amyloid precursor protein and modifies its processing on the secretory pathway. Less

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Masaya Okamoto: "Ultrastructural localization of mintl at synapses in mouse hippocampus"Eur.J.Neurosci.. 12. 3067-3072 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hiroyuki Nishimura: "Changes in mintl, a novel synaptic protein, after transient global ischemia in mouse hippocampus"J.Cereb.Blood Flow Metab.. 20. 1437-1445 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masaya Okamoto: "Amyloid precursor protein associates independently and collaboratively with PTB and PDZ domains pf mint on vesicles and at cell membrane"Neuroscience. (in press). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masaya Okamoto, Tomohiro Matsuyama and Minoru Sugita: "Ultrastructural localization of mint1 at synapses in mouse hippocampus."Eur.J.Neurosci.. 12. 3067-3072 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hiroyuki Nishimura, Tomohiro Matsuyama Kyoko Obata, Yatsuka Nakajima, Hideto Kitano Minoru Sugita, and Masaya Okamoto: "Changes in mint1, a novel synaptic protein, after transient global ischemia in mouse hippocampus."J.Cereb.Blood Flow Metab.. 20. 1437-1445 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masaya Okamoto, Yatsuka Nakajima Tomohiro Matsuyama, and Minoru Sugita: "Amyloid precursor protein associates independently and collaboratively with PTB and PDZ domains of mint on vesicles and at cell membrane."Neuroscience. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Masaya Okamoto: "Ultrastructural localization of mint 1 at synapses in mouse hippocampus"Eur.J.Neurosci.. 12. 3067-3072 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hiroyuki Nishimura: "Changes in mint 1, a novel synaptic protein, after transient global ischemia in mouse hippocampus"J.Cereb.Blood Flow Metab.. 20. 1437-1445 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masaya Okamoto: "Amyloid precursor protein associates independently and collaboratively with PTB and PDZ domains of mint on vesicles and at cell membrane"Neuroscience. (in press). (2001)

    • Related Report
      2000 Annual Research Report

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

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