低酸素応答性因子シグナル伝達は、胚発生期の介在ニューロン発達、GRIN2B発現、および成体大脳皮質機能に影響を与える
I-Ling Lu1, Mengyi Song2, Cinthia Rangel-Sandoval3
1The Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco (UCSF), San Francisco, CA 94143, USA; Department of Pediatrics, Division of Neonatology, UCSF, San Francisco, CA 94158, USA; Department of Neurology, UCSF, San Francisco, CA 94143, USA.
Developmental cell
|February 6, 2026
まとめ
低酸素応答性因子(HIF)は脳発達に不可欠であり、抑制性ニューロン産生とシナプス機能に影響を与える。本研究はHIFシグナル伝達が
科学分野:
- 神経科学
- 分子生物学
- 発生生物学
背景:
- 低酸素応答性因子(HIF)は、酸素および脳における代謝に対する細胞応答を調節する。
- 抑制性ニューロン発達におけるHIFの役割は十分に理解されていない。
研究 の 目的:
- 内側神経節eminence(MGE)における抑制性ニューロン発達におけるHIFシグナル伝達の役割を調査する。
- 介在ニューロン前駆細胞の増殖とシナプス形成に関与するHIF標的を同定する。
主な方法:
- マウスのMGEにおけるHif1/2aおよびvon Hippel-Lindau(vHL)の条件付き削除。
- HIF標的を同定するための単一細胞トランスクリプトミクス。
- 成体HIF1条件付きノックアウト(cKO)マウスの大脳皮質におけるパルブミン(PV)介在ニューロン、GABA作動性シナプス、およびGRIN2B発現の分析。
- 長期増強(LTP)を評価するための電気生理学的記録。
主要な成果:
- MGE前駆細胞におけるHif1/2aの欠損は増殖を低下させ、vHLの欠損は増殖を増加させた。
- HIF1Aは、NMDA受容体サブユニット2BをコードするGRIN2Bの直接的な活性化因子として同定された。
- 成体HIF1 cKOマウスでは、PV介在ニューロンの減少、GABA作動性シナプスの減少、およびLTPの機能不全が認められた。
結論:
- HIFシグナル伝達は、抑制性ニューロン産生の調節において非古典的な役割を果たす。
- HIFはGRIN2B発現および大脳皮質回路の成熟に不可欠である。
- これは、シナプス機能および脳回路発達におけるHIFの重要性を強調する。
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