アミグダラと肝臓の信号は,ストレスに対する血糖反応を調節する

J R E Carty^1,2, K Devarakonda¹, R M O'Connor²

¹Diabetes, Obesity and Metabolism Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Nature

|September 3, 2025

まとめ

急性ストレスが脳に信号を送り血糖値が上がり食欲が減ります慢性的なストレスはこれを妨害し桃体と肝臓の軸に影響を及ぼすことで糖尿病のような状態に繋がります

科学分野:

神経科学
代謝に関する研究
内分泌学

背景:

環境の脅威に対する行動的適応はエネルギー動員を必要とします
ストレスへの代謝適応における桃体の役割はほとんど不明である.
ストレスに起因する代謝の変化を理解することは健康にとって極めて重要です

研究の目的:

急性および慢性ストレスへの代謝適応における桃体の役割を調査する.
神経経路を特定して桃体と代謝の調節を繋ぐ
ストレスによるグルコース調節障害の仕組みを解明する.

主な方法:

中枢桃体 (MeA) ニューロンの活性化が,中腹桃体 (VMH) に発射される.
血糖値と食事の行動の評価
神経回路をマッピングするために全身のウイルスを追跡します
肝臓のグルコン生成とホルモン調節の分析

主要な成果:

急性ストレスはMeAVMHニューロンを活性化し,腎上腺/臓ホルモンとは無関係に高血糖と低食症を引き起こす.
MeAから肝臓への多シナプス神経回路が特定されました.
この回路は,肝臓のグルコーネオゲネシス経由で迅速なグルコース合成を促進します.
繰り返しストレスにさらされると,MeAによる血糖のコントロールが低下し,糖尿病のような代謝機能障害が生じます.

結論:

アミグダラと肝臓の軸はストレスに対する急速な血糖反応の重要なレギュラーです
繰り返されるストレスはこの軸を乱し代謝機能障害と糖尿病に寄与します
この研究はストレスによる代謝変化のための新しい神経経路を明らかにしています

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