気分や不安障害におけるネガティブな感情の処理中のサライエンスネットワークの皮質下調節

Sevil Ince^1,2, Ben J Harrison³, Kim L Felmingham⁴

¹Melbourne School of Psychological Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia. since@student.unimelb.edu.au.

Molecular psychiatry

|August 28, 2025

まとめ

気分や不安障害を持つ人は脳の接続性が変化し,特に周水管のグレー (PAG) から前部インスラへの抑制信号が欠如し,感情処理に影響します.

科学分野:

神経科学
精神科
脳イメージング

背景:

ネガティブな感情的な出来事を処理できないのは気分や不安障害の特徴です
前部インスラを含む突起ネットワーク (SN) の異常な機能が関与しています.
皮質下部の領域である桃体や水管内灰質 (PAG) は感情の処理と神経回路の調整に不可欠です

研究の目的:

ネガティブな感情の処理中に amigdala,PAG,および SN の間の神経相互作用を調査する.
気分や不安障害に関連した脳の接続の違いを特定する

主な方法:

超高フィールドの7テスラ機能磁気共鳴画像 (fMRI) を使ったダイナミック・カザル・モデリング (DCM) を利用した.
気分や不安障害を持つ37人の参加者のデータを分析し感情的な変なパラダイムを使って 37人の健康な対照群に匹配しました

主要な成果:

双方向の相互作用が両グループで発見されました
健康な対照群はPAGを前面インスラに抑制する効果を示したが,患者ではその効果はなかった.
このPAG-to-insula接続は診断状態,ネガティブな影響,うつ病,ストレスを予測しました.

結論:

変化したPAG-to- anterior insula阻害は,気分や不安障害における不適応性突起因子に寄与する重要な神経メカニズムである.
これらの発見は,PAG-SNの相互作用が感情的調節障害における役割を強調しています.

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