| Project/Area Number |
23K21394
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| Project/Area Number (Other) |
21H02802 (2021-2023)
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Multi-year Fund (2024)
Single-year Grants (2021-2023) |
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| Section | 一般 |
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| Review Section |
Basic Section 51020:Cognitive and brain science-related
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| Research Institution | University of Tsukuba |
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Principal Investigator |
ラザルス ミハエル 筑波大学, 国際統合睡眠医科学研究機構, 教授 (80469650)
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| Project Period (FY) |
2024-04-01 – 2026-03-31
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| Project Status |
Granted (Fiscal Year 2024)
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| Budget Amount *help |
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2025: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2024: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2023: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2022: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2021: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
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| Keywords | Sleep / Glia / sleep / glia / scRNAseq |
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| Outline of Research at the Start |
The cellular and molecular processes underlying the build-up of sleepiness and maintenance of sleep are unknown. Glia are far from being merely support cells of the brain. The nucleus accumbens, a new sleep-regulating area through the integration of motivational stimuli provides an excellent opportunity to study the regulation of sleep and motivation by glia-neuron interactions.
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| Outline of Annual Research Achievements |
We have previously shown that the nucleus accumbens (NAc) is a novel brain region involved in sleep regulation, especially non-rapid eye movement sleep, by integrating motivational stimuli. We successfully demonstrated sleep induction in the NAc of freely behaving mice by increasing the activity of extracellular adenosine derived from astrocytes and neurons with a photoactivatable allosteric modulator of adenosine A2A receptors. We also showed that cytokine production in microglia during wakefulness is important for maintaining wakefulness, demonstrating the importance of glia-mediated neuroimmune interactions in the sleep-wake cycle.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The paper, "Optochemical control of slow-wave sleep in the nucleus accumbens of male mice by a photoactivatable allosteric modulator of adenosine A2A receptors," has been published in the high-impact journal Nature Communications.
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| Strategy for Future Research Activity |
We continue to perform chemogenetic activation/inhibition of nucleus accumbens microglia and biochemical and genetic experiments to analyze the function of inflammation-related genes in the NAc. These analyses may help to unravel microglia-neuron interactions in sleep/wake regulation, provide new insights into the link between sleep homeostasis and immune resilience, and identify potential therapeutic targets for the treatment of sleep disorders.
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