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霊長類の脳の海馬では,性成熟が完了した後でも例外的にニューロンが新生する。これらの新生ニューロンがどのように既存のニューロンと機能的な神経回路をつくるかは明らかでない。筆者らは世界で初めてこれらの新生ニューロンがレム睡眠中の記憶固定化に必須の役割を果たすことを明らかにした。このメカニズムを解明し新生ニューロンが機能的な回路を形成する過程を明らかにすることで,中枢神経の再生医療の発展に貢献したい。
Abstract
In the middle of the 20th century, adult neurogenesis and rapid eye movement sleep were discovered independently in mammals. The former prompted the idea to apply this rare cellular regenerative capacity in the adult central nervous system to restore damaged brain circuitry, and the latter led to the finding of dynamic brain state changes during sleep and their functional ramifications, including those for memory consolidation. Recently, calcium imaging analysis and optogenetic manipulation have enabled the examination of the activity of specific neuronal populations with precise timing. These technological advances, which allow for the investigation of adult-born neuron activity during sleep in mice, led us to discover its essential function for memory consolidation.
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