B12は,腸の不活性化と,Tet2欠乏性の血液形成を強める炎症性微生物環境を促進する
bioRxiv : the preprint server for biology
|September 5, 2025
まとめ
高レベルのビタミンB12は,腸内細菌を破壊し,有益な短鎖脂肪酸 (SCFA) を減少させ,クローナル血液形成 (CH) を悪化させる可能性があります. ブチラートのようなSCFAを補充することで,これらの効果は逆転し,CHの新たな治療法を示唆した.
科学分野:
- 血液学
- 微生物学
- 腫瘍学
背景:
- ビタミンB12の血清濃度の上昇は,クローナル血液形成 (CH) と骨髄性悪性腫瘍のリスクの増加と関連しています.
- ビタミンB12のサプリメントは腸内微生物群と腸の健康に不可欠な短鎖脂肪酸 (SCFA) の生成に影響します.
- TET2変異はCHを誘発し 微生物信号とビタミンB12の影響を受けます
研究 の 目的:
- Tet2欠乏したCHのモデルでビタミンB12補給の微小環境効果を調査する.
- 腸内微生物群が,ビタミンB12のCH進行への影響を媒介する役割を調査する.
主な方法:
- Tet2欠乏症と野生型のマウスモデルにおけるB12補給効果の評価
- 骨髄形成の分析,細菌刺激に対する骨髄細胞の反応,および炎症性サイトカインレベル.
- 腸内微生物の構成とSCFAを生成するバクテリアの評価,ブチラートによる介入
主要な成果:
- ビタミンB12サプリメントは 骨髄形成と 骨髄細胞の細菌刺激に対する反応性を高めました
- 循環中の炎症性サイトカインの増加は,B12補給後に観察されました.
- B12は腸内不活性化を引き起こし,SCFAを生成するバクテリアを減少させ,ブチラートによって効果は逆転した.
結論:
- ビタミンB12は,腸内微生物群を通してSCFAの代謝を妨害することで,CHの進行を促進する可能性があります.
- SCFAの補給,特にブチラートは,CHを緩和するための治療戦略として潜在的であることを示しています.
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