| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
Adult neurogenesis in mammalian brain declines with aging. We identify p38 MAP-Kinase as a key factor in the proliferation of neural progenitor cells (NPCs) but not stem cells in adult neurogenic niches. p38 expression in adult NSPCs is downregulated during aging. Deletion of p38alpha which is a major isozyme of p38 family in NSPCs reduces the proliferation of NPCs but not stem cells. Conversely, forced expression of p38alpha in NSPCs in the aged SVZ restores NPC proliferation and neurogenesis. We also found that p38 is necessary for suppressing the expression of Dickkopf-1(DKK1) and secreted frizzled-related protein 3(SFRP3) which are antagonists of the Wnt signaling. Moreover, the knockdown of either Dkk1 or Sfrp3 facilitates proliferation of NPCs in aged mouse SVZ. Age-related reduction in p38 thus leads to decreased adult neurogenesis via downregulation of Wnt signaling.
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