2017 Fiscal Year Final Research Report
Homocysteine Increases Tau Phosphorylation, Truncation and Oligomerization.
| Project/Area Number |
15K08904
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
General internal medicine(including psychosomatic medicine)
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| Research Institution | University of Fukui |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
濱野 忠則 福井大学, 学術研究院医学系部門, 准教授 (40334817)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | ホモシステイン / タウ蛋白 / 神経原線維変化 / タウオパチー |
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| Outline of Final Research Achievements |
Hcy activated glycogen synthase kinase 3, a major tau phosphokinase, and inactivated protein phosphatase 2A, a main tau phosphatase. Hcy exhibited cytotoxic effects associated with enhanced activation of caspase. Truncation of tau in the C-terminus, the cleavage site of caspase3 (i.e., D421, detected by the TauC3 antibody) also was increased. Total tau, phosphorylated tau, as well as C-terminal cleaved tau were increased in the sarkosyl insoluble tau fraction. Hcy also increased the level of tau oligomers, as indicated by the tau oligomer complex 1 (TOC1) antibody that specifically identifies oligomeric tau species, in the tris insoluble, sarkosyl soluble fraction.The levels of TOC1-positive oligomeric tau were increased in brain lysate from HHCy mice.
These observations suggest that Hcy increases the levels of phosphorylated tau as well as truncated tau species via caspase3 activation, and enhanced tau oligomerization and aggregation.
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| Free Research Field |
脳神経内科 認知症
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