ヘモグロビンはシドオペロキシダースであり,酸化ストレスに関連する疾患の薬剤標的である

Woojin Won¹, Elijah Hwejin Lee^2,3, Lizaveta Gotina^2,3

¹Center for Cognition and Sociality, Institute for Basic Science (IBS), Daejeon, Republic of Korea.

Signal transduction and targeted therapy

|August 22, 2025

まとめ

脳細胞のヘモグロビンは,過酸化水素を分解して酸化ストレスと戦う. 新しい薬であるKDS12025はこの防御機能を強化し神経退行性疾患の新たな治療戦略を提供します

科学分野:

神経科学
生物化学
薬理学について

背景:

ヘモグロビン (Hb) は主に酸素輸送で知られていますが,脳内の機能,特にアストロサイトとニューロンではよく理解されていません.
高濃度の過酸化水素 (H2O2) は,アルツハイマー病,パーキンソン病,老化などの病気における酸化ストレスと神経変異に寄与します.
神経変性疾患ではアストロサイトHbレベルが低下し,酸化的損傷を悪化させる.

研究の目的:

脳細胞におけるHbの役割と神経変性プロセスへの関与を調査する.
脳内の酸化ストレス軽減のための新しい治療薬KDS12025の開発と評価.
神経退行性疾患の治療対象として Hb を検討する.

主な方法:

ヒポカンプスと黒い質のアストロサイトとドーパミン神経細胞におけるHbの識別と局所化.
Hbのシドオペロキシダース活性を増強するために設計された血液脳障壁に浸透する小分子であるKDS12025の開発.
アルツハイマー病,パーキンソン病,アミオトロフィック横筋硬化症,老化を含む細胞および動物モデルにおけるH2O2レベル,アストログリオシス,Hb正常化および神経保護に対するKDS12025の効果の評価.
KDS12025の有効性のためにその必要性を確認するためにHbの遺伝子サイレンス.

主要な成果:

Hbは脳細胞の細胞溶液,ミトコンドリア,核で発見され,H2O2を分解するシドオペロキシダースとして作用した.
KDS12025は,Hbのシドオキシダース活性を大幅に高め,H2O2レベルと酸化ストレスを下げました.
KDS12025の治療は,アストログリオシスを緩和し,Hbレベルを正常化し,様々な疾患モデルで神経変性症を予防しました.
KDS12025は重度のALSと老化モデルで生存率と運動機能を改善し,幅広い治療の可能性を示した.
核細胞におけるHbの存在は,核成分を保護する新たな抗酸化作用を示唆している.

結論:

ヘモグロビンは神経細胞とアストロサイトの抗酸化作用に以前は認識されていなかった重要な役割を果たします
KDS12025はHbのシドオペロキシダース活性を増強する第一級の治療薬で,H2O2による神経変性に対する新しい戦略を提供します.
アルツハイマー病,パーキンソン病,ALS,および他の年齢関連の酸化ストレス障害に対する有望な治療法です.

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